Leonid Tsoy
Backend Engineer @Fom Group
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WORK HISTORY
Backend Engineer @Fom Group
FOM Group is a company providing digital solutions for the pharmaceutical industry, serving pharmacies, 250+ distributors, 3M+ users. Worked in the B2C team handling ~500k MAU.* Redesigned Telegram bot with async architecture, scaling from <1k to 2.5k+ RPS with 0.51% error rate* Reduced API response time by ~70% from 500ms to 150ms by introducing Redis-based caching and optimizing SQL requests* Designed and developed a broadcasting service delivering messages to ~1M users.* Achieved 80%+ test coverage for core services (enforcing as a minimum)* Introduced and integrated an A/B testing platform, enabling data-driven product decisions.
EDUCATION
Politecnico di Torino
Bachelor's degree, Computer Engineering
Politecnico di Torino
Master's degree, Artificial Intelligence
ABOUT LEONID TSOY
Backend Engineer with 5+ years of experience in building and optimizing scalable web applications. Strong expertise in Python, API performance tuning, database optimization, and CI/CD automation. Skilled in applying SOLID principles, TDD, and Clean Architecture to deliver reliable, maintainable, and high-performance software solutions. Proven track record of improving system scalability, resilience, and response times in fast-paced product environments.
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