- Led frontend development (team of five) of a Web3 bug bounty platform.- Selected tech stack, wrote front-end/some back-end code (JavaScript, React.js, Node.js, GraphQL, Relay, Ant Design, SCSS; Python, Django).- Handled project management: planning, communication, feature releases, roadmaps, product decisions.- Managed team: hiring, mentoring, workshops, expertise sharing, code review, conflict resolution, outsourcing.- Gained expertise in Web3, Web3 security, Solidity, Ethereum and Polygon blockchains.- Enhanced performance of company's Next.js/ThreeJS project: improved PageSpeed metrics by 475%, reduced bundle size by 50% (used Web Workers and Offscreen Canvas for WebGL rendering in a separate CPU thread).

- Built the entire front end of live chat software: initially Vue.js, later migrated to React/Redux. Wrote 45k lines single-handedly from scratch. Used GraphQL, NodeJS, Sass, WebSockets, Service Workers, and Push API.- As a PWA (Progressive Web App), it works on the web, installable on desktops and smartphones, with offline mode.- Developed TypeScript SDK and published it to npm.- Did product management: hypotheses, user research, market analysis, and prototypes. I was officially promoted to Product Manager (so I worked on both coding and product).- Designed user interfaces.

- Developed VK Pay (a wallet service within the VK.com super-app).- Worked on a web app as well as a hybrid mobile app for iOS/Android built with TypeScript, React, and React Native WebView, and utilizing Redux, Redux Thunk, Jest/Mocha, Webpack, and Node + Express.js.- Created a highly optimized frontend for a 100M audience.- Worked closely with the product team, brainstormed and contributed to product and UX decisions.

- Co-founded the company, helped raise $310k seed investments from US and Japanese VCs.- Built & scaled the team: hired 3 devs, created hiring framework.- Built single-page web-app (TypeScript, React.js, Redux). Contributed to backend: Python, Django, Django REST Framework, PostgreSQL, REST API, CI/CD pipelines.- Designed & prototyped: UI & interactive prototypes with Axure.- Single-handedly built an early-stage PHP prototype.- Product ownership: owned product decisions, did market analysis, UX research, user discovery interviews.- Implemented additional projects such as custom WordPress landing pages, Slack bot, email automation.

- Built a responsive Angular single-page app with a service-oriented architecture: one API powers several Angular.js apps.- Created internal Chrome extension for LinkedIn scraping.- Implemented client-side E2E tests using Protractor / Selenium WebDriver.- Designed and developed an internal UI Bootstrap/BEM-based style guide.- Contributed to backend development (Python, Django).

- Joined as the first front-end engineer. Created SPA single-handedly with CoffeeScript and my own MVC framework.- Created a popular Chrome extension for recruiters (20,000 users).- Wrote client-side implementation of a Java Solr-like query syntax parser (to be used by advanced users).- As an early startup employee, did demos for VCs, engaged early adopters, shaped UI/UX, and designed & developed landing page.

- Joined as one of the first ten engineers. Launched Extranet (hotel management tool) in 3 months together with another frontend dev (BackboneJS, jQuery, Closure Compiler).- Rewrote SEO catalog's front end: improved UX, ran A/B testing (using Optimizely) to increase conversion rates. As a result, the SEO catalog became the company's most profitable customer acquisition channel. Ostrovok is now a company with a $700+ million turnover, 5 million monthly visitors, and a team in 28 countries.

Developed bank website using JS, jQuery, HTML, CSS, with C#, DotNetNuke, .NET framework, and IIS on the backend.