Serhii

Production-grade multi-agent async trading system for the TON NFT marketplace. Scalable architecture: 115,000+ LOC. Built with Python 3.11, it runs 4 parallel bot instances (from High-tier (50+ TON) to Entry-level segments), each managing a pair of Telegram trading accounts. The system uses 400+ Pyrogram sessions for parallel marketplace scanning, integrates 6 external APIs (MRKT, Portal, Gift Satellite, Peek.tg, xGift oracle, Snipes channel), and implements sophisticated trading strategies: nano-TON precision outbidding, 4-stage dynamic repricing, cross-rebuy mechanics to reset platform fee counters, and A/B strategy testing. Includes risk management (balance guards, inventory caps, emergency shutdown), backtesting engine, paper trading mode, FastAPI web dashboard, and aiogram Telegram admin bot. High-performance tools for Gas Wars and DeFi automation.

A production PWA built for hosting live-session Mafia games with friends. The game engine is deterministic: 17 unique roles, 3 factions, and 16 artifact cards that modify game state in complex ways. Real-time state is synced via Supabase so multiple devices can participate simultaneously. The Monte Carlo simulator runs 1,000 simulated games to validate role balance — an engineering approach grounded in probability analysis. Deployed on Vercel with full offline support.

Built out of genuine need — finding housing in Lisbon is painful. The aggregator scrapes Idealista, Imovirtual, Remax, and Era simultaneously, deduplicates listings across portals using address fingerprinting, and flags suspicious patterns like the same property being relisted multiple times at different prices. The mortgage calculator applies current Portuguese fiscal rules (IMT, IS, bank rates) for accurate monthly payment estimates. 12,000+ active listings in the database. Runs on Render.com with PostgreSQL backend.