Senior Backend Engineer / Tech Owner with 20+ years of experience building backend systems for fintech, Web3, AI and high-load products. My strongest zone is hands-on technical ownership: backend architecture, database design, production stability, payment infrastructure, Web3/EVM systems, trading engines and AI/LLM-based platforms. I work best in roles where deep engineering matters more than administrative management. I prefer to own complex technical problems end-to-end: from architecture and implementation to production reliability, incident response and long-term maintainability. Key areas: • Backend architecture and high-load APIs • Node.js / TypeScript / SQL / Docker / Linux • Payment systems, reconciliation and anti-fraud logic • Web3, EVM, Solidity and asset recovery workflows • Trading infrastructure and margin/liquidation math • AI assistants, RAG, vector search, LLM integrations and computer vision Notable experience includes building and maintaining automated payout systems, resolving critical crypto transaction incidents, developing DEX arbitrage infrastructure and creating custom high-performance trading backtesting engines. I am especially interested in senior IC / tech owner roles where reliability, security, performance and pragmatic engineering are critical.