Semyon L.

Backend & Blockchain Engineer (Go / Node.JS / EVM) with 9+ years of experience building production-grade distributed systems. I specialize in DeFi infrastructure, DEX integrations, and high-load backend services written in Go and Node.JS. I have hands-on experience integrating AMMs and EVM-based protocols, working with blockchain node codebases, and delivering reliable backend systems in fast-paced product environments. Recently, I worked on DEX aggregation and protocol integrations, contributing to adapter development, production issue resolution, release preparation, and system validation. I also have experience extending and maintaining a Go-based blockchain node (Fantom fork), delivering patches, and supporting ecosystem components. What I can help you with: • Integrating new DEX / AMM protocols (Uniswap-like, custom AMMs) • Building or extending DEX aggregators • EVM interaction (calldata parsing, event decoding, transaction simulation) • Backend services in Go, Node.JS (REST / gRPC, microservices) • High-load systems with PostgreSQL, MongoDB, Redis • Event-driven architectures (Kafka, RabbitMQ, NATS) • Production debugging, performance optimization, reliability improvements • Docker, CI/CD, Kubernetes environments I take ownership of features end-to-end: from architecture and estimation to implementation, debugging, and release. I am comfortable working in distributed teams and production-critical environments. If you need a backend or blockchain engineer who understands both infrastructure and product delivery — I can help.