Aleksandr Efremovtsev
@aleksandrefremovtsev
Senior Frontend Developer at ROGII Europe who improved AI-assisted development workflows by ~30%.
SerbiaWhat I'm looking for
At ROGII Europe, I developed complex monitoring systems designed to render heavy streams of real-time data. I also rebuilt the development workflow with Claude Code and Cursor, reducing time spent writing code and tests and on code review by about 30%.
Earlier, at Performance Lab, I turned a partially working UXCrowd project with bugs and legacy code into a working product and developed services including interview transcripts and a First Click test. I’ve also developed React portals and SaaS platforms, and mentored UI developers.
Experience
Work history, roles, and key accomplishments
Senior Frontend Engineer
ROGII Europe
Nov 2022 - Aug 2026 (3 years 9 months)
Developed high-performance monitoring systems with a focus on rendering performance under real-time data streams. Reduced time spent on coding, testing, and code review by ~30% through AI-driven development with Claude Code and Cursor.
Frontend Developer
Flow Health, Inc
Feb 2022 - Nov 2022 (9 months)
Developed the company's SPA portals using React, TypeScript, and Redux. Brought two portals for different business roles to release and extended the in-house UI kit of React components.
Senior Frontend Developer
Performance Lab
Feb 2020 - Feb 2022 (2 years)
Developed the SPA for the UXCrowd project, turning a partially working project with bugs and legacy code into a working one and updating the stack. Developed new services such as interview transcripts, a First Click test, and a prescreener.
Senior Frontend Developer
National Financial System JSC
Sep 2019 - Feb 2020 (5 months)
Developed a SaaS platform with direct connection to acquiring banks for cashless settlement in the metallurgical industry. The project was shut down after 5 months for financial reasons.
Frontend Developer
Banki.ru
Jan 2017 - Aug 2019 (2 years 7 months)
Developed modules in native JavaScript, ES6-7, and jQuery, a component library in React, and applications with Redux, Redux Form, Flux, and Material UI. Worked on HTML/CSS markup and project builds using Gulp and Webpack.
Education
Degrees, certifications, and relevant coursework
English for IT
Certificate, English
Completed the English for IT course at B1-B2 level in 2024.
React Native 2020. Mobile applications in JavaScript
Certificate, Mobile Development
Completed the React Native 2020 course on mobile applications in JavaScript in 2020.
Moscow Institute of Physics and Technology (MIPT)
Bachelor's degree, Applied Physics and Mathematics
Studied Applied Physics and Mathematics at the Moscow Institute of Physics and Technology, graduating in 2012.
Tech stack
Software and tools used professionally
Availability
Location
SerbiaAuthorized to work in
Salary expectations
Social media
Job categories
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