Location: Tbilisi, Georgia
LinkedIn: linkedin.com/in/eugeneleontev
GitHub: github.com/madmatvey
Blog: madmatvey.github.io

Lead Ruby engineer with 8+ years specializing in high-load backends, microservices, and fintech solutions. Proven track record of delivering 92% performance improvements, scaling systems to handle 5,000+ daily transactions, and leading cross-functional teams of up to 12 engineers.

• Performance Optimization: Reduced database query latency from 250ms to 20ms, achieving 92% system throughput improvement
• Scalability: Architected USDT wallet processing 5,000+ daily transactions with 300+ deposits in first week
• Team Leadership: Led 12-engineer teams, delivering features 2 weeks ahead of schedule
• Growth: Drove 12x user growth through referral programs generating 50,000+ invites
• API Optimization: Slashed wallet API response time from 35-45s to 5-7s

Backend Development: Ruby on Rails, PostgreSQL, Microservices Architecture
Cloud & DevOps: AWS, Kubernetes, CI/CD, Docker
Performance & Security: Query Optimization, OAuth, TRC20/ERC20 Integration
Leadership: Technical Team Management, Cross-functional Collaboration, Remote Team Coordination

Principal Ruby Engineer | Fintech Startup (TRC20 USDT Wallet) | Sep 2024–May 2025

• Sole backend architect for Series A fintech startup
• Built secure USDT deposit system scaling to 5,000+ daily transactions
• Designed referral engine driving 12x user growth

Lead Ruby Developer | Wallarm (API Security) | Jan 2023–Mar 2024

• Led MySQL→PostgreSQL migration achieving 30% query performance improvement
• Implemented OAuth-based IAM supporting 100k+ daily API calls

Lead Ruby Developer | Eleving Group (Fintech) | May 2022–Dec 2022

• Redesigned core architecture for 92% throughput improvement
• Implemented PostgreSQL materialized views reducing query times by 80%

Team Lead / Senior Ruby Developer | Appbooster | Aug 2018–Apr 2022

• Managed 12-engineer team delivering releases ahead of schedule
• Integrated monitoring tools reducing average query time from 250ms to 20ms

• B.Sc. Computer Science in Economics | Urals State University (2005-2007)
• Computing Machines & Networks | Novosibirsk State Technical University (2001-2004)
• AI Tools Workshop | Delivered to 60 engineers with 75% adoption rate (2025)
• Remote Team Management | Coursera & GitLab Certification (2024)

• Languages: English (B2+), Russian (Native)
• Availability: 9am-5pm EST / 2pm-10pm GMT for live collaboration
• Work Authorization: No sponsorship required

"All complex systems are built in small and relatively simple iterations."

Cheers,
Eugene