Backend / Blockchain Engineer with ~3 years of commercial experience building backend systems, Web3 products, smart contract tooling, and crypto payment flows.
My recent work focuses on Go backend services, blockchain integrations, wallet logic, transaction processing, and backend systems with complex business logic. I have experience building production-oriented systems for Web3 gaming, crypto payouts, developer tooling, and smart contract workflows.
Backend: Go, REST APIs, GraphQL, PostgreSQL, Redis, RabbitMQ
Blockchain: EVM-compatible networks, Starknet, Cairo, Solidity, Ink!, WASM
Infrastructure: Docker, Linux, Git, CI/CD, AWS, Prometheus, Grafana
Other: Rust, Actix, algorithms and data structures
- Data Room — fullstack cloud file storage application built with Flask and React
- swanky-cli — contribution to developer tooling for smart contract workflows
- OpenBrush — contribution to reusable smart contract library components
- Nethermind Starknet tooling — contribution to Starknet-related developer tooling
- Payout Orchestrator — Go backend project for reliable crypto payout orchestration
- Backend systems
- Web3 backend infrastructure
- Crypto payment flows
- Wallet integrations
- Smart contract integrations
- Event-driven backend systems
- Product-oriented backend development
- LinkedIn: olexanderberezan
- Email: berezan.ab@gmail.com