Freelancer · Ref 1G52ZN · Listed September 2026
Andreas Køhler
Backend developer, Node.js and PostgreSQL
I design APIs and data models. I like the problems where payments, queues and consistency meet — the places where a bug costs money.
Selected work
Payment gateway for a marketplace
Node.jsPostgreSQL
Escrow, partial refunds and bank reconciliation. Handles around 9,000 transactions a day.
Hire Andreas and the budget moves into escrow the same minute.
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