Most focused on React Native application performance and responsiveness. The main achievements are ChatGPT integration into the search, map view performance which can now render thousands of elements at a time rather than under 100 before, and reduced network request processing time by 250ms using caching strategies. In addition, part of my work is research on data fetching optimization and technical validation of AI experiments.

Mostly responsible for the codebase standards, UX research, and its implementation. Worked on merging similar components, implemented by different developers over a long time (like inputs, modals, select dropdowns), into a single highly customizable components, which resulted in a significant reduction in the codebase and application stability. Also, introduced some new universal structures (interfaces) for the same data, which were used between different components, but converted to a proper format, so the platform codebase went more consistent. On the UX improvements side, had a key role in the implementation of React Query, which made the application more responsive by caching data; also developed a solution that allowed to have list views with filters/sorting applied and modal windows its direct links.In addition, worked on build performance by migrating legacy webpacker gem to the newer approach with a separate build process, so it allowed our team to perform a bunch of tests with esbuild and webpack's incremental builds. The main stack is Typescript, Jest, React, React Router, React Query.

Main responsibility was web- and mobile applications architecture design. As a team leader made decisions about the tech stack used, proposed product solutions, and managed the hiring and growth of the team. Most recent projects were a brand-new e-learning platform built with Next.js and GraphQL and the local market's largest taxi mobile application with complex logic and real-time updates re-engineered using React Native and MQTT.Worked on many customer projects in different domains from scratch to release in close collaboration with product and design teams. The most iconic and complex projects were the responsive web application for the local taxi service (Vue.js, MQTT, MapboxGL), dynamic enrollment forms for the worldwide universities network (form configuration constructor built with React and dynamic forms vanilla JS renderer), and TikTok-like mobile application with voice recognition (React Native, AWS Lambda, AWS API Gateway, GCloud). Also, configured various Gitlab CI pipelines to build, test and deploy React apps, React Native apps using Fastlane, and AWS serverless solutions.

Performed a complete development cycle from building web applications with Coffeescript, jQuery, and SASS to delivery to the customers.