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<!DOCTYPE html><html>
<head>
<meta charset="utf-8">
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<meta name="description" content="Sergey Leschev, Team Lead (Swift, TypeScript, Database). Sergey is a professional who is responsible for the design and construction of websites and apps.">
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<body>
<article id="personal-details" class="markdown-body"><h1> <a href="https://sergeyleschev.github.io"><img itemprop="image" alt="Sergey Leschev" src="apple-touch-icon.png" width=27/></a> Sergey Leschev</h1>
<img itemprop="image" alt="Sergey Leschev" src="https://sergeyleschev.github.io/sergeyleschev.png" width=300/>
<h3>FullStack Developer</h3>
<p><a href="https://sergeyleschev.github.io/sergeyleschev-ios-roadmap.html">Swift (L6+)</a> | <a href="https://sergeyleschev.github.io/sergeyleschev-fullstack-roadmap.html">Full Stack (L6+)</a> | <a href="https://sergeyleschev.github.io/sergeyleschev-design-patterns.html">Design Patterns (L6+)</a> | <a href="https://sergeyleschev.github.io/sergeyleschev-system-architect-roadmap.html">System Architect (L7+)</a> | <a href="https://medium.com/@sergeyleschev/lists">Blog</a></p>
<p>Google Engineering Level: L6+</p>
<br>
<h2>🏆 Awards</h2>
<h3>Ranking #Dev: Global TOP 200 (<a href="https://leetcode.com/sergeyleschev/">Certificate</a>)</h3>
<p><a href="https://leetcode.com/sergeyleschev/"><img itemprop="image" alt="Sergey Leschev" src="https://github.com/sergeyleschev/sergeyleschev/blob/main/leetcode-ranking.png?raw=true" width="410"></a></p>
<p><a href="https://leetcode.com/sergeyleschev/"><img itemprop="image" alt="Sergey Leschev" src="https://github.com/sergeyleschev/sergeyleschev/blob/main/leetcode-medals.png?raw=true" width="280"></a></p>
<p><strong>Languages</strong>: TypeScript, Shell, Database (T-SQL, PL/SQL, MySQL), Concurrency (Python3).</p>
<p><strong>Algorithms</strong>: linked lists, binary search, hash table, queue/stack, dfs/bfs, sort, heap/hash, two pointers, sliding window, tree, greedy problems etc.</p>
<hr>
<div style="page-break-after: always;"></div>
<h3>Golden Award for the Year of the Tiger Challenge</h3>
<img itemprop="image" alt="Sergey Leschev" src="https://github.com/sergeyleschev/sergeyleschev/blob/main/codility-ranking.png?raw=true" width="410">
<p><strong>Algorithmic skills</strong>: Dynamic programming, Greedy algorithms, Catepillar method, Binary search algorithm, Fibonacci numbers, Euclidean algorithm, Sieve of Eratosthenes, Prime and composite numbers, Maximum slice problem, Stack and Queues, Sorting, Time Complexity, Arrays, Prefix Sums, Leader, etc.</p>
<p><strong>Contest</strong>: Algorithms, SQL, Data Structures, Bitwise operations (bit-ops), Frontend.</p>
<hr>
<div style="page-break-after: always;"></div>
<p>Tapping on a link will take you to relevant certificates.</p>
<h2>Front-End</h2>
<ul>
<li>[X] Basics
<ul>
<li>[X] HTML
<ul>
<li>[X] Learn the basics of HTML</li>
<li>[X] Make a few pages as an exercise</li>
</ul>
</li>
<li>[X] CSS
<ul>
<li>[X] Learn the basics of CSS</li>
<li>[X] Style pages from previous step</li>
<li>[X] Build a page with grid and flexbox</li>
</ul>
</li>
<li>[X] JS Basics
<ul>
<li>[X] Get familiar with the syntax</li>
<li>[X] Learn basic operations on DOM</li>
<li>[X] Learn mechanisms typical for JS (Hoisting, Event Bubbling, Prototyping)</li>
<li>[X] Make some AJAX (XHR) calls</li>
<li>[X] Learn new features (ECMA Script 6+)</li>
<li>[X] Additionally, get familiar with the jQuery library</li>
</ul>
</li>
</ul>
</li>
<li>[X] General Development Skills
<ul>
<li>[X] Learn GIT, create a few repositories on GitHub, share your code with other people</li>
<li>[X] Know HTTP(S) protocol, request methods (GET, POST, PUT, PATCH, DELETE, OPTIONS)</li>
<li>[X] Get familiar with terminal, configure your shell (bash, zsh, fish)</li>
<li>[X] Studied algorithms and data structures in the university</li>
<li>[X] Studied design patterns in the university</li>
</ul>
</li>
<li>[X] Learn React on <a href="https://reactjs.org/tutorial/tutorial.html">official website</a> or complete some <a href="https://egghead.io/courses/the-beginner-s-guide-to-react">courses</a></li>
<li>[X] Get familiar with tools that you will be using
<ul>
<li>[X] Package Managers
<ul>
<li>[X] <a href="https://www.npmjs.com/">npm</a></li>
<li>[X] <a href="https://yarnpkg.com/lang/en/">yarn</a></li>
</ul>
</li>
<li>[X] Task Runners
<ul>
<li>[X] <a href="https://docs.npmjs.com/misc/scripts">npm scripts</a></li>
<li>[X] <a href="https://gulpjs.com/">gulp</a></li>
</ul>
</li>
<li>[X] <a href="https://webpack.js.org/">Webpack</a></li>
<li>[X] <a href="https://rollupjs.org/guide/en">Rollup</a></li>
<li>[X] <a href="https://parceljs.org/">Parcel</a></li>
</ul>
</li>
<li>[X] Styling
<ul>
<li>[X] CSS Preprocessor
<ul>
<li>[X] <a href="https://sass-lang.com/">Sass/CSS</a></li>
<li>[X] <a href="https://postcss.org/">PostCSS</a></li>
<li>[X] <a href="http://lesscss.org/">Less</a></li>
<li>[X] <a href="http://stylus-lang.com/">Stylus</a></li>
</ul>
</li>
<li>[X] CSS Frameworks
<ul>
<li>[X] <a href="https://getbootstrap.com/">Bootstrap</a></li>
<li>[X] <a href="https://materializecss.com/">Materialize</a>, <a href="https://material-ui.com/">Material UI</a>, <a href="https://getmdl.io/">Material Design Lite</a></li>
<li>[X] <a href="https://bulma.io/">Bulma</a></li>
<li>[X] <a href="https://semantic-ui.com/">Semantic UI</a></li>
</ul>
</li>
<li>[X] CSS Architecture
<ul>
<li>[X] <a href="http://getbem.com/">BEM</a></li>
<li>[X] <a href="https://github.com/css-modules/css-modules">CSS Modules</a></li>
<li>[X] <a href="https://acss.io/">Atomic</a></li>
<li>[X] <a href="https://github.com/stubbornella/oocss/wiki">OOCSS</a></li>
<li>[X] <a href="https://smacss.com/">SMACSS</a></li>
<li>[X] <a href="https://suitcss.github.io/">SUITCSS</a></li>
</ul>
</li>
<li>[X] CSS in JS
<ul>
<li>[X] <a href="https://www.styled-components.com/">Styled Components</a></li>
<li>[X] <a href="https://formidable.com/open-source/radium/">Radium</a></li>
<li>[X] <a href="https://emotion.sh/">Emotion</a></li>
<li>[X] <a href="http://cssinjs.org/">JSS</a></li>
<li>[X] <a href="https://github.com/Khan/aphrodite">Aphrodite</a></li>
</ul>
</li>
</ul>
</li>
<li>[X] State Management
<ul>
<li>[X] <a href="https://reactjs.org/docs/faq-state.html">Component State</a>/<a href="https://reactjs.org/docs/context.html">Context API</a></li>
<li>[X] <a href="https://redux.js.org/">Redux</a>
<ul>
<li>[X] Async actions (Side Effects)
<ul>
<li>[X] <a href="https://github.com/reduxjs/redux-thunk">Redux Thunk</a></li>
<li>[X] <a href="https://github.com/Lukasz-pluszczewski/redux-better-promise">Redux Better Promise</a></li>
<li>[X] <a href="https://redux-saga.js.org/">Redux Saga</a></li>
<li>[X] <a href="https://redux-observable.js.org">Redux Observable</a></li>
</ul>
</li>
<li>[X] Helpers
<ul>
<li>[X] <a href="https://rematch.gitbooks.io/rematch/">Rematch</a></li>
<li>[X] <a href="https://github.com/reduxjs/reselect">Reselect</a></li>
</ul>
</li>
<li>[X] Data persistence
<ul>
<li>[X] <a href="https://github.com/rt2zz/redux-persist">Redux Persist</a></li>
<li>[X] <a href="https://github.com/adam-golab/redux-phoenix">Redux Phoenix</a></li>
</ul>
</li>
<li>[X] <a href="https://redux-form.com">Redux Form</a></li>
</ul>
</li>
</ul>
<ol start="3">
<li><a href="https://mobx.js.org/">MobX</a></li>
</ol>
</li>
<li>[X] Type Checkers
<ul>
<li>[X] <a href="https://reactjs.org/docs/typechecking-with-proptypes.html">PropTypes</a></li>
<li>[X] <a href="https://www.typescriptlang.org/">TypeScript</a></li>
<li>[X] <a href="https://flow.org/en/">Flow</a></li>
</ul>
</li>
<li>[X] Form Helpers
<ul>
<li>[X] <a href="https://redux-form.com">Redux Form</a></li>
<li>[X] <a href="https://github.com/jaredpalmer/formik">Formik</a></li>
<li>[X] <a href="https://github.com/formsy/formsy-react">Formsy</a></li>
<li>[X] <a href="https://github.com/final-form/final-form">Final Form</a></li>
</ul>
</li>
<li>[X] Routing
<ul>
<li>[X] <a href="https://reacttraining.com/react-router/">React-Router</a></li>
<li>[X] <a href="https://router5.js.org/">Router5</a></li>
<li>[X] <a href="https://github.com/faceyspacey/redux-first-router">Redux-First Router</a></li>
<li>[X] <a href="https://reach.tech/router/">Reach Router</a></li>
</ul>
</li>
<li>[X] API Clients
<ul>
<li>[X] REST
<ul>
<li>[X] <a href="https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API">Fetch</a></li>
<li>[X] <a href="https://visionmedia.github.io/superagent/">SuperAgent</a></li>
<li>[X] <a href="https://github.com/axios/axios">axios</a></li>
</ul>
</li>
<li>[X] GraphQL
<ul>
<li>[X] <a href="https://www.apollographql.com/docs/react/">Apollo</a></li>
<li>[X] <a href="https://facebook.github.io/relay/">Relay</a></li>
<li>[X] <a href="https://github.com/FormidableLabs/urql">urql</a></li>
</ul>
</li>
</ul>
</li>
<li>[X] Utility Libraries
<ul>
<li>[X] <a href="https://lodash.com/">Lodash</a></li>
<li>[X] <a href="https://momentjs.com/">Moment</a></li>
<li>[X] <a href="https://github.com/JedWatson/classnames">classnames</a></li>
<li>[X] <a href="http://numeraljs.com/">Numeral</a></li>
<li>[X] <a href="http://reactivex.io/">RxJS</a></li>
<li>[X] <a href="https://facebook.github.io/immutable-js/">ImmutableJS</a></li>
<li>[X] <a href="https://ramdajs.com/">Ramda</a></li>
</ul>
</li>
<li>[X] Testing
<ul>
<li>[X] Unit Testing
<ul>
<li>[X] <a href="https://facebook.github.io/jest/">Jest</a></li>
</ul>
</li>
<li>[X] End to End Testing
<ul>
<li>[X] <a href="https://www.seleniumhq.org/">Selenium</a>, <a href="http://webdriver.io/">Webdriver</a></li>
</ul>
</li>
<li>[X] Integration Testing
<ul>
<li>[X] <a href="https://karma-runner.github.io/">Karma</a></li>
</ul>
</li>
</ul>
</li>
<li>[X] Internationalization
<ul>
<li>[X] <a href="https://github.com/yahoo/react-intl">React Intl</a></li>
<li>[X] <a href="https://react.i18next.com/">React i18next</a></li>
</ul>
</li>
<li>[X] Server Side Rendering
<ul>
<li>[X] <a href="https://nextjs.org/">Next.js</a> <a href="https://github.com/sergeyleschev/next.js"><code>sources</code></a></li>
</ul>
</li>
<li>[X] Static Site Generator
<ul>
<li>[X] <a href="https://www.gatsbyjs.org/">Gatsby</a></li>
</ul>
</li>
<li>[X] Backend Framework Integration
<ul>
<li>[X] <a href="https://shakacode.gitbooks.io/react-on-rails/content/">React on Rails</a></li>
</ul>
</li>
<li>[X] Mobile
<ul>
<li>[X] <a href="https://github.com/sergeyleschev/react-native">React Native</a></li>
</ul>
</li>
<li>[X] Desktop
<ul>
<li>[X] <a href="https://github.com/sergeyleschev/electron">Electron</a></li>
<li>[X] <a href="https://github.com/Microsoft/react-native-windows">React Native Windows</a></li>
</ul>
</li>
</ul>
<div style="page-break-after: always;"></div>
<h2>Back-End</h2>
<ul>
<li>
<p>[X] Prerequisites</p>
<ul>
<li>[X] <a href="https://www.w3schools.com/js/">JavaScript</a></li>
<li>[X] <a href="https://docs.npmjs.com/">NPM</a></li>
<li>[X] <a href="https://nodejs.org/en/docs/">Node.js</a></li>
<li>[X] <a href="https://www.w3schools.com/js/js_versions.asp">ECMAScript</a></li>
</ul>
</li>
<li>
<p>[X] General Development Skills</p>
<ul>
<li>[X] Learn GIT, create a few repositories on GitHub, share your code with other people</li>
<li>[X] Know HTTP(S) protocol, request methods (GET, POST, PUT, PATCH, DELETE, OPTIONS)</li>
<li>[X] Studied algorithms and data structures in the university</li>
<li>[X] Studied design patterns in the university</li>
<li>[X] <a href="https://www.w3schools.com/js/js_conventions.asp">Clean code</a></li>
</ul>
</li>
<li>
<p>[X] Web Frameworks</p>
<ul>
<li>[X] <a href="https://expressjs.com/">Express.js</a></li>
<li>[X] <a href="https://adonisjs.com/">Adonis.js</a></li>
<li>[X] <a href="https://www.meteor.com/">Meteor.js</a></li>
<li>[X] <a href="https://nestjs.com/">Nest.js</a></li>
<li>[X] <a href="https://sailsjs.com/">Sails.js</a></li>
<li>[X] <a href="https://koajs.com/">Koa.js</a></li>
<li>[X] <a href="https://loopback.io/">Loopback.io</a></li>
<li>[X] <a href="https://eggjs.org/en/index.html">egg.js</a></li>
<li>[X] <a href="https://midwayjs.org/midway/en/">midway</a></li>
</ul>
</li>
<li>
<p>[X] Databases</p>
<ul>
<li>[X] Relational
<ul>
<li>[X] <a href="https://www.microsoft.com/en-us/sql-server/sql-server-2017">SQL Server</a> <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>sources.sql</code></a></li>
<li>[X] <a href="https://www.postgresql.org/">PostgreSQL</a> <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>sources.sql</code></a></li>
<li>[X] <a href="https://mariadb.org/">MariaDB</a> <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>sources.sql</code></a></li>
<li>[X] <a href="https://www.mysql.com/">MySQL</a> <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>sources.sql</code></a></li>
</ul>
</li>
<li>[X] Cloud Databases
<ul>
<li>[X] <a href="https://docs.microsoft.com/en-us/azure/cosmos-db">CosmosDB</a> <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>sources</code></a></li>
<li>[X] <a href="https://aws.amazon.com/dynamodb/">DynamoDB</a> <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>sources</code></a></li>
</ul>
</li>
<li>[X] Search Engines
<ul>
<li>[X] <a href="https://www.elastic.co/">ElasticSearch</a></li>
<li>[X] <a href="http://lucene.apache.org/solr/">Solr</a></li>
<li>[X] <a href="http://sphinxsearch.com/">Sphinx</a></li>
</ul>
</li>
<li>[X] NoSQL
<ul>
<li>[X] <a href="https://www.mongodb.com/">MongoDB</a> <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>sources</code></a></li>
<li>[X] <a href="https://redis.io/">Redis</a> <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>sources</code></a></li>
<li>[X] <a href="http://cassandra.apache.org/">Apache Cassandra</a></li>
<li>[X] <a href="https://github.com/mbdavid/LiteDB">LiteDB</a></li>
<li>[X] <a href="https://github.com/ravendb/ravendb">RavenDB</a></li>
<li>[X] <a href="http://couchdb.apache.org/">CouchDB</a></li>
</ul>
</li>
</ul>
</li>
<li>
<p>[X] Caching</p>
<ul>
<li>[X] <a href="https://www.npmjs.com/package/node-cache">Node-Cache</a></li>
<li>[X] Distributed Cache
<ul>
<li>[X] <a href="https://redis.io/">Redis</a> <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>sources</code></a></li>
<li>[X] <a href="https://memcached.org/">Memcached</a> <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>sources</code></a></li>
</ul>
</li>
<li>[X] <a href="https://www.npmjs.com/package/memory-cache">Memory Cache</a></li>
</ul>
</li>
<li>
<p>[X] Logging</p>
<ul>
<li>[X] Log Frameworks
<ul>
<li>[X] <a href="https://www.loggly.com/docs/node-js-logs-2/">Node-Loggly</a></li>
<li>[X] <a href="https://github.com/winstonjs/winston">Winston</a></li>
<li>[X] <a href="https://github.com/trentm/node-bunyan">Node-Bunyan</a></li>
<li>[X] <a href="https://github.com/expressjs/morgan">Morgan</a></li>
</ul>
</li>
<li>[X] Log Management System
<ul>
<li>[X] <a href="http://sentry.io">Sentry.io</a></li>
<li>[X] <a href="https://loggly.com">Loggly.com</a></li>
</ul>
</li>
</ul>
</li>
<li>
<p>[X] Template Engines</p>
<ul>
<li>[X] <a href="https://mustache.github.io/">Mustache.js</a></li>
<li>[X] <a href="https://handlebarsjs.com/">Handlebars</a></li>
<li>[X] <a href="https://ejs.co/">EJS</a></li>
<li>[X] <a href="https://pugjs.org/api/getting-started.html">Pug</a></li>
<li>[X] <a href="https://mozilla.github.io/nunjucks/">Nunjunks.js</a></li>
</ul>
</li>
<li>
<p>[X] Real-Time Communication</p>
<ul>
<li>[X] <a href="https://socket.io/">Socket.IO</a></li>
</ul>
</li>
<li>
<p>[X] Typed Superset</p>
<ul>
<li>[X] <a href="https://www.typescriptlang.org/">TypeScript</a></li>
<li>[X] <a href="https://flow.org/">Flow</a></li>
</ul>
</li>
<li>
<p>[X] API Clients</p>
<ul>
<li>[X] REST
<ul>
<li>[X] <a href="https://www.npmjs.com/package/node-rest-client">Node-Rest-Client</a></li>
<li>[X] <a href="https://github.com/axios/axios">Axios</a></li>
</ul>
</li>
<li>[X] <a href="https://graphql.org/">GraphQL</a></li>
<li>[X] Authentication</li>
</ul>
</li>
<li>
<p>[X] Good to Know</p>
<ul>
<li>[X] <a href="https://caolan.github.io/async/">Async.js</a></li>
<li>[X] <a href="http://pm2.keymetrics.io/">PM2</a></li>
<li>[X] <a href="https://github.com/tj/commander.js/">Commander.js</a></li>
<li>[X] <a href="http://www.passportjs.org/">Passport</a></li>
<li>[X] <a href="https://nodemailer.com/about/">Nodemailer</a></li>
<li>[X] <a href="https://marked.js.org/#/README.md#README.md">Marked</a></li>
<li>[X] <a href="https://eslint.org/">ESLint</a></li>
</ul>
</li>
<li>
<p>[X] Testing</p>
<ul>
<li>[X] Unit, Behavior, Integration Testing
<ul>
<li>[X] <a href="https://jestjs.io/">Jest</a></li>
<li>[X] <a href="https://jasmine.github.io/">Jasmine</a></li>
<li>[X] <a href="https://www.chaijs.com/">Chai</a></li>
<li>[X] <a href="https://mochajs.org/">Mocha</a></li>
<li>[X] <a href="https://github.com/airbnb/enzyme">Enzyme</a></li>
<li>[X] <a href="https://sinonjs.org/">Sinon</a></li>
</ul>
</li>
<li>[X] E2E Testing
<ul>
<li>[X] <a href="https://help.crossbrowsertesting.com/selenium-testing/getting-started/javascript/">Selenium</a></li>
<li>[X] <a href="https://github.com/GoogleChrome/puppeteer">Puppeteer</a></li>
</ul>
</li>
</ul>
</li>
<li>
<p>[X] Task Scheduling</p>
<ul>
<li>[X] <a href="https://github.com/agenda/agenda">Agenda</a></li>
<li>[X] <a href="https://github.com/jhuckaby/Cronicle">Cronicle</a></li>
<li>[X] <a href="https://www.npmjs.com/package/node-schedule">Node-Schedule</a></li>
</ul>
</li>
<li>
<p>[X] MicroServices</p>
<ul>
<li>[X] Message-Broker
<ul>
<li>[X] <a href="https://www.rabbitmq.com/tutorials/tutorial-one-javascript.html">RabbitMQ</a></li>
<li>[X] <a href="https://www.npmjs.com/package/kafka-node">Apache Kafka</a></li>
<li>[X] <a href="https://github.com/apache/activemq">ActiveMQ</a></li>
<li>[X] <a href="https://docs.microsoft.com/en-us/azure/service-bus-messaging/service-bus-messaging-overview">Azure Service Bus</a></li>
</ul>
</li>
<li>[X] Message-Bus
<ul>
<li>[X] <a href="https://distribus.com/">Distribus</a></li>
<li>[X] <a href="https://github.com/capriza/node-busmq">BusMQ</a></li>
</ul>
</li>
</ul>
</li>
<li>
<p>[X] <a href="https://www.pluralsight.com/courses/javascript-practical-design-patterns">Design-Patterns</a></p>
</li>
<li>
<p>[X] <a href="https://github.com/trekhleb/javascript-algorithms/">JavaScript Algorithms and Data Structures</a></p>
</li>
</ul>
<div style="page-break-after: always;"></div>
<h2>Computer Science</h2>
<ul>
<li>[X] <code>Computer Science knowledge</code>
<ul>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>Algorithms</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a>
<ul>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>Sorting</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>Graph Theory</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a>
<ul>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript">Trees</a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
</ul>
</li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>Strings</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript">Greedy</a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript">Dynamic Programming</a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript">Bit Manipulation</a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>Recursion</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript">Game Theory</a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript">NP Complete</a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>Big-O notation</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
</ul>
</li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>Abstract Data Types</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a>
<ul>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>Stack</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>Array</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>List</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>Map</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript">Multimap</a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>Set</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript">Multiset (Bag)</a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>Graph</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a>
<ul>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript">Tree</a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
</ul>
</li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript"><code>Queue</code></a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript">Priority Queue</a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript">Double-ended priority queue</a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
<li>[X] <a href="https://github.com/sergeyleschev/leetcode-typescript">Double-ended queue</a> <a href="https://leetcode.com/sergeyleschev/"><code>cert</code></a></li>
</ul>
</li>
<li>[X] <code>System design</code>
<ul>
<li>[X] <a href="https://github.com/sergeyleschev/system-design/blob/main/sergeyleschev-system-architect-roadmap.md">Design large-scale systems / Amazon, Dropbox, Instagram, Facebook, Netflix, Pinterest, Twitter, Uber, Youtube</a></li>
</ul>
</li>
</ul>
</li>
</ul>
<div style="page-break-after: always;"></div>
<h2> <a href='https://github.com/sergeyleschev/react-custom-hooks'>React Custom Hooks (L6+)</a></h2>
<p>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useArray/useArray.js'>useArray</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useAsync/useAsync.js'>useAsync</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useClickOutside/useClickOutside.js'>useClickOutside</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useCookie/useCookie.js'>useCookie</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useCopyToClipboard/useCopyToClipboard.js'>useCopyToClipboard</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useDarkMode/useDarkMode.js'>useDarkMode</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useDebounce/useDebounce.js'>useDebounce</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useDebugInformation/useDebugInformation.js'>useDebugInformation</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useDeepCompareEffect/useDeepCompareEffect.js'>useDeepCompareEffect</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useEffectOnce/useEffectOnce.js'>useEffectOnce</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useEventListener/useEventListener.js'>useEventListener</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useFetch/useFetch.js'>useFetch</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useGeolocation/useGeolocation.js'>useGeolocation</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useHover/useHover.js'>useHover</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useLongPress.js/useLongPress.js'>useLongPress</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useMediaQuery/useMediaQuery.js'>useMediaQuery</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useOnlineStatus/useOnlineStatus.js'>useOnlineStatus</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useOnScreen/useOnScreen.js'>useOnScreen</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/usePrevious/usePrevious.js'>usePrevious</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useRenderCount/useRenderCount.js'>useRenderCount</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useScript/useScript.js'>useScript</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useStateWithHistory/useStateWithHistory.js'>useStateWithHistory</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useStateWithValidation/useStateWithValidation.js'>useStateWithValidation</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useStorage/useStorage.js'>useStorage</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useTimeout/useTimeout.js'>useTimeout</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useToggle/useToggle.js'>useToggle</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useTranslation/useTranslation.js'>useTranslation</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useUpdateEffect/useUpdateEffect.js'>useUpdateEffect</a>
<a href='https://github.com/sergeyleschev/react-custom-hooks/blob/main/src/hooks/useWindowSize/useWindowSize.js'>useWindowSize</a>
</p>
<div style="page-break-after: always;"></div>
<h2><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md">Design Patterns</a> (L6+)</h2>
<table>
<thead>
<tr>
<th><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#behavioral">Behavioral</a></th>
<th><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#creational">Creational</a></th>
<th><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#structural">Structural</a></th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-chain-of-responsibility">🐝 Chain Of Responsibility</a></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-abstract-factory">🌰 Abstract Factory</a></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-adapter">🔌 Adapter</a></td>
</tr>
<tr>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-command">👫 Command</a></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-builder">👷 Builder</a></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-bridge">🌉 Bridge</a></td>
</tr>
<tr>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-interpreter">🎶 Interpreter</a></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-factory-method">🏭 Factory Method</a></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-composite">🌿 Composite</a></td>
</tr>
<tr>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-iterator">🍫 Iterator</a></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-monostate">🔂 Monostate</a></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-decorator">🍧 Decorator</a></td>
</tr>
<tr>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-mediator">💐 Mediator</a></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-prototype">🃏 Prototype</a></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-facade">🎁 Facade</a></td>
</tr>
<tr>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-memento">💾 Memento</a></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-singleton">💍 Singleton</a></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-flyweight">🍃 Flyweight</a></td>
</tr>
<tr>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-observer">👓 Observer</a></td>
<td></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-protection-proxy">☔ Protection Proxy</a></td>
</tr>
<tr>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-state">🐉 State</a></td>
<td></td>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-virtual-proxy">🍬 Virtual Proxy</a></td>
</tr>
<tr>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-strategy">💡 Strategy</a></td>
<td></td>
<td></td>
</tr>
<tr>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-visitor">🏃 Visitor</a></td>
<td></td>
<td></td>
</tr>
<tr>
<td><a href="https://github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md#-template-method">📝 Template Method</a></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<h2>Project Guidelines (L6+)</h2>
<p>A set of best practices in my projects.</p>
<ul>
<li>[X] <a href="https://github.com/sergeyleschev/sergeyleschev/blob/main/sergeyleschev-fullstack-project-guidelines.md#git">Git</a></li>
<li>[X] <a href="https://github.com/sergeyleschev/sergeyleschev/blob/main/sergeyleschev-fullstack-project-guidelines.md#documentation">Documentation</a></li>
<li>[X] <a href="https://github.com/sergeyleschev/sergeyleschev/blob/main/sergeyleschev-fullstack-project-guidelines.md#environments">Environments</a></li>
<li>[X] <a href="https://github.com/sergeyleschev/sergeyleschev/blob/main/sergeyleschev-fullstack-project-guidelines.md#dependencies">Dependencies</a></li>
<li>[X] <a href="https://github.com/sergeyleschev/sergeyleschev/blob/main/sergeyleschev-fullstack-project-guidelines.md#testing">Tesing</a></li>
<li>[X] <a href="https://github.com/sergeyleschev/sergeyleschev/blob/main/sergeyleschev-fullstack-project-guidelines.md#structure-and-naming">Structure and Naming</a></li>
<li>[X] <a href="https://github.com/sergeyleschev/sergeyleschev/blob/main/sergeyleschev-fullstack-project-guidelines.md#code-style">Code Style</a></li>
<li>[X] <a href="https://github.com/sergeyleschev/sergeyleschev/blob/main/sergeyleschev-fullstack-project-guidelines.md#logging">Logging</a></li>
<li>[X] <a href="https://github.com/sergeyleschev/sergeyleschev/blob/main/sergeyleschev-fullstack-project-guidelines.md#api">API</a></li>
</ul>
<h2>Licenses & certifications</h2>
<ul>
<li>🏆 LeetCode Global TOP 200 (TypeScript: <a href="https://leetcode.com/sergeyleschev/">Certificate</a>, Sources: <a href="https://github.com/sergeyleschev/leetcode-typescript">TypeScript</a>).</li>
<li>🏆 Golden Award for the Year of the Tiger Challenge (TypeScript: <a href="https://app.codility.com/cert/view/certQBA3EW-QESXM38DNR3SXMYZ/">Certificate</a>, Sources: <a href="https://github.com/sergeyleschev/codility-swift">Codility</a>).</li>
<li>2022 July LeetCode Challenge (<a href="https://leetcode.com/sergeyleschev">2022-07-31</a>).</li>
<li>2022 June LeetCode Challenge (<a href="https://leetcode.com/sergeyleschev">2022-06-30</a>).</li>
<li>2022 May LeetCode Challenge (<a href="https://leetcode.com/sergeyleschev">2022-05-31</a>).</li>
<li>2022 Apr LeetCode Challenge (<a href="https://leetcode.com/sergeyleschev">2022-04-30</a>).</li>
<li>LeetCode Dynamic Programming (<a href="https://leetcode.com/sergeyleschev">2022-05-07</a>).</li>
<li>Graph Theory (<a href="https://leetcode.com/sergeyleschev">2022-04-30</a>).</li>
<li>SQL (<a href="https://leetcode.com/sergeyleschev">2022-04-26</a>).</li>
<li>Algorithm I (<a href="https://leetcode.com/sergeyleschev">2022-04-30</a>), Algorithm II (<a href="https://leetcode.com/sergeyleschev">2022-05-21</a>).</li>
<li>Data Structure I (<a href="https://leetcode.com/sergeyleschev">2022-04-30</a>), Data Structure II (<a href="https://leetcode.com/sergeyleschev">2022-05-21</a>).</li>
<li>Binary Search I (<a href="https://leetcode.com/sergeyleschev">2022-04-28</a>), Binary Search II (<a href="https://leetcode.com/sergeyleschev">2022-05-18</a>).</li>
<li>Programming Skills I (<a href="https://leetcode.com/sergeyleschev">2022-04-28</a>), Programming Skills II (<a href="https://leetcode.com/sergeyleschev">2022-05-18</a>).</li>
<li>LinkedIn Skill Asessment (Front-End): <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Front-end%20Development/report/">Front-end Development</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Angular/report/">Angular</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/React/report/">React</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/JavaScript/report/">Javascript</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/HTML/report/">HTML</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Cascading%20Style%20Sheets%20(CSS)/report/">CSS</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/jQuery/report/">jQuery</a>.</li>
<li>LinkedIn Skill Asessment (Back-End): <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Node.js/report/">Node.js</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Java/report/">Java</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Spring%20Framework/report/">Spring Framework</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Scala/report/">Scala</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/C%23/report/">C#</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/.NET%20Framework/report/">.NET Framework</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Unity/report/">Unity</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Python%20(Programming%20Language)/report/">Python (Programming Language)</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Django/report/">Django</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/PHP/report/">PHP</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/C%20(Programming%20Language)/report/">C (Programming Language)</a>.</li>
<li>LinkedIn Skill Asessment (Databases): <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/MongoDB/report/">MongoDB</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/NoSQL/report/">NoSQL</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Transact-SQL%20(T-SQL)/report/">Transact-SQL (T-SQL)</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/MySQL/report/">MySQL</a>.</li>
<li>LinkedIn Skill Asessment (Infra/DevOps): <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Bash/report/">Bash</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Git/report/">Git</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Amazon%20Web%20Services%20(AWS)/report/">Amazon Web Services (AWS)</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/AWS%20Lambda/report/">AWS Lambda</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Google%20Cloud%20Platform%20(GCP)/report/">Google Cloud Platform (GCP)</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Microsoft%20Azure/report/">Microsoft Azure</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/Hadoop/report/">Hadoop</a>, <a href="https://www.linkedin.com/in/sergeyleschev/detail/assessments/IT%20Operations/report/">IT Operations</a>.</li>
</ul>
<h2>Latest Projects</h2>
<h3>[Web] Health & Fitness Web App</h3>
<p>Role: Team Lead (L6+).</p>
<p>Description (tasks): Development architecture and new features.</p>
<p>Tech Stack:</p>
<ul>
<li>React 18+: Hooks. Redux. Redux Toolkit.</li>
<li>UI Framework: PrimeReact.</li>
<li>NodeJS: NestJS, TypeORM.</li>
<li>PostgreSQL. ORM.</li>
<li>MongoDB. Aggregations.</li>
<li>Docker.</li>
<li>CI/CD (DO, AWS, Github Actions).</li>
<li>gRPC, WebSockets.</li>
</ul>
<div style="page-break-after: always;"></div>
<h2>Contacts</h2>
<p>I have a clear focus on time-to-market and don't prioritize technical debt. And I took part in the Pre-Sale/RFX activity as a System Architect, assessment efforts for Frontend (React-TypeScript) and Backend (NodeJS-.NET-PHP-Kafka-SQL-NoSQL). And I also formed the work of Pre-Sale as a CTO from Opportunity to Proposal via knowledge transfer to Successful Delivery.</p>
<p>🛩️ #startups #management #cto #swift #typescript #database</p>
<p>📧 Email: <a href="mailto:sergey.leschev@gmail.com">sergey.leschev@gmail.com</a></p>
<p>👋 LinkedIn: <a href="https://www.linkedin.com/in/sergeyleschev/">https://linkedin.com/in/sergeyleschev</a></p>
<p>👋 Twitter: <a href="https://twitter.com/sergeyleschev">https://twitter.com/sergeyleschev</a></p>
<p>👋 Github: <a href="https://github.com/sergeyleschev">https://github.com/sergeyleschev</a></p>
<p>🌎 Website: <a href="https://sergeyleschev.github.io">https://sergeyleschev.github.io</a></p>
<p>🌎 DEV Community: <a href="https://dev.to/sergeyleschev">https://dev.to/sergeyleschev</a></p>
<p>🌎 Reddit: <a href="https://reddit.com/user/sergeyleschev">https://reddit.com/user/sergeyleschev</a></p>
<p>🌎 Quora: <a href="https://quora.com/sergey-leschev">https://quora.com/sergey-leschev</a></p>
<p>🌎 Medium: <a href="https://medium.com/@sergeyleschev">https://medium.com/@sergeyleschev</a></p>
<p>🖨️ PDF: <a href="https://sergeyleschev.github.io/sergeyleschev-fullstack-roadmap.pdf">Download</a></p>
<p>ALT: SIARHEI LIASHCHOU</p>
<footer>
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