Senior Backend Engineer - Payment Systems

CodeDecoders is looking for a Senior Backend Engineer with hands-on experience building real payment and transaction systems. We are currently delivering a regulated cross-border digital asset platform involving remittances, payouts, settlements, transaction processing, banking and payment-provider integrations, wallets, KYC/KYB integrations, reconciliation, and operational tooling. This is not a role focused on simple checkout integrations. We are looking for engineers who have dealt with real-money transaction states, idempotency, retries, duplicate prevention, provider timeouts, unknown transaction statuses, reconciliation, refunds/reversals, settlement workflows, and production incidents involving financial transactions. You will work closely with the product and engineering team and own backend modules end-to-end, including architecture, database design, implementation, integrations, testing, and production reliability. Our primary backend stack is Node.js, TypeScript, Express/NestJS, PostgreSQL, Redis, and AWS. Strong payment-system experience matters more to us than matching every technology. Engineers coming from Java/Spring Boot, Python, or .NET are also welcome if they have meaningful payment, banking, wallet, ledger, remittance, lending, crypto/stablecoin, or transaction-processing experience. We particularly value engineers who can explain how they have designed transactions, balances, ledger entries, settlements, reconciliation processes, and safe failure recover