● Developed from scratch and launched 3 full-stack projects (CRM, e-commerce platform, internal portal), acting as the only developer on the React, Node.js, NestJS and PostgreSQL stack. ● Detected and eliminated a critical vulnerability (SQL injection) in the API of the company's main product, preventing the risk of unauthorized access to the data of 5000+ users. ● Refactored and optimized rendering of a key project, improving Core Web Vitals (LCP from 3.2s to 1.5s) and raising Google PageSpeed from 55 to 92. ● Set up CI/CD pipelines using GitLab CI and Docker, which reduced the deployment time of new versions from 30 minutes of manual work to 5 minutes in automatic mode. ● Designed and implemented REST API for a new mobile application, including authentication, working with profiles and integration with 3 external services.

● Developed and implemented a custom module for CMS, which allowed content managers to independently collect pages from ready-made blocks, reducing their time to publish articles from 1 hour to 10 minutes. ● Created and maintained a library of 50+ reused React components in Storybook, which accelerated the development of new interfaces in the team by ~30%. ● Participated in the development of 10+ client sites and landing pages, responsible for pixel-perfect layout and implementation of interactive logic in JavaScript and React. ● Conducted an audit and refactoring of the legacy project, rewriting ~40% of the code base from vanilla JS to TypeScript, which reduced the number of bugs in production by 20%.