eugeneleontev

Architected and launched a TRC20 deposit system that became the backbone of the product. Designed automated workflows that scaled from 300 deposits/week to 5,000+ daily within two months. Delivered a referral engine driving 50,000 invites and 12× growth in active users. Produced post-mortems and implemented fixes within hours, ensuring 99.9% reliability.

Directed MySQL → PostgreSQL migration, improving query performance by 32%. Built threats log management system supporting 100K+ secure API calls daily.

Redesigned legal reporting pipeline, reducing manual verification time for legal teams by 67%, saving over 100+ staff hours per month. Mitigated regulatory risk by introducing verifiable calculation logic across all client debt reports.

Evolved from Junior Developer to Team Lead, overseeing 12 engineers. Introduced asynchronous daily reporting, cutting meeting time by 45%, improved focus and transparency, and maintained strong team cohesion through open communication and proactive conflict resolution. Diagnosed and optimized top SQL queries (500+ LOC), reducing latency from 250ms to 20ms and other high-load endpoints to 1–2ms. Achieved 10× faster response times, $600/month AWS RDS savings, and a 3× increase in quarterly revenue by improving app responsiveness. Drove backend/frontend collaboration with React Native app serving 10K+ DAU.

Built and scaled a blockchain explorer, boosting daily active users by 35% in 6 months. Published a Ruby wrapper for Bitcoin-Core enabling secure on-chain transactions.