Backend engineering, web3, and app development. Based in Zürich.
What we do
Backend engineering
15 years across distributed systems, API design, and infrastructure. TypeScript / Node.js, Python, Java, with PostgreSQL, GraphQL, data pipelines, and AWS. Available as a senior freelance hire or fractional tech lead, from architecture through to production and on-call.
Web3
DeFi protocol backends in production since 2022, across multiple chains. On-chain indexing, subgraphs, RPC infrastructure, Solidity tooling, and security monitoring (Hypernative, bug bounty programs).
App development
End-to-end product work: native mobile, web, and the servers behind them. Shipped, not just shipped-to-staging.
Currently building
A lean ordering app for club festivals, school events, market stalls, and pop-ups. Orders, kitchen, counter, on any tablet or phone.
zack.events