Sep 2021 – Feb 2024 · 2 yrs 5 mos · Berlin, Germany

• Increased company revenue by 2% by fixing behavior of app redirects.
• Improved "Time To First Byte" metric of the app by 0.3s by removing requests waterfall.
• Improved code quality in repositories by adding eslint, typescript, pull request checks (github actions).
• Participated in various product features by developing UI, writing unit, e2e and smoke tests.
• Participated in on-call rotations.

Mar 2019 – Aug 2021 · 2 yrs 5 mos · Berlin, Germany

• Designed and led development of:
• "Bitcoin Interest Account". Project was done by integration of third-party provider and development of UI with ReactNative. Project let user to accumulate interest on Bitcoin. Used by 8000 users. Generating more than half a million Euro of income yearly.
• "Trading Reporting". Project was done by creating ETL processes with AWS lambda and PostgreSQL. It included generation of 3 daily reports (10000 rows each) and export to csv.
• Introduced and developed "Code Style Guide", that was officially accepted by company developers.
• Mentored junior developers.

Jul 2018 – Feb 2019 · 7 mos · Kiev, Ukraine

• Developed UI with React/Redux and backend API with Node.js and PostgreSQL for a military document management system (1000 users per system instance).
• Introduced security improvement by removing "SQL Injection" vulnerability.

Nov 2016 – Jan 2018 · 1 yr 2 mos · Kyiv, Ukraine

• Web applications development with jQuery and PHP.