We’re building financial infrastructure where a duplicated payment or a ledger that doesn’t balance is a serious incident. We need a fullstack engineer with deep backend and payments experience, who works with AI agents every day and takes full responsibility for what ships.
What You’ll Do
Build and own high-performance backend services in Node.js and TypeScript for payment flows, including asynchronous workflows and webhook processing
Integrate with external fintech APIs and handle their real-world behavior: retries, timeouts, out-of-order events, and partner downtime
Design idempotent payment processing and transaction handling on PostgreSQL that holds up under heavy concurrency
Build and maintain immutable ledger and reconciliation logic so the numbers always add up
Deliver the frontend for these features in React.js and TypeScript, and make system design decisions across the stack
Design and run AI orchestration and multi-agent workflows, including task delegation, context management, and validation of agent outputs
Use AI tools and agents across coding, debugging, testing, documentation, and code review
Verify everything AI produces before it reaches production. You own the result, whoever or whatever wrote the first draft
Raise blockers, risks, and unclear requirements early with the team instead of guessing
What you bring
Expert-level experience building high-performance backend systems with Node.js and TypeScript, including asynchronous workflows and webhook engineering
Hands-on experience integrating external fintech APIs in production
Expert knowledge of PostgreSQL transactions, isolation levels, locking, and concurrency
Proven experience designing idempotent payment processing
Strong system design skills
Good knowledge of financial systems: transactions, immutable ledgers, and core accounting concepts (double-entry, balances, settlement)
Working familiarity with BaaS, CaaS, Open Finance, and reconciliation
Solid frontend skills in React.js and TypeScript, able to deliver features end to end
Hands-on experience with AI orchestration and multi-agent workflows, including managing context across concurrent agent tasks
Daily, practical use of AI tools and agents, with a real example of catching an AI mistake before it shipped
Proficient English communicator experienced in collaborating across distributed, remote teams
Nice to Have
Experience with payment providers, card networks, or banking partners
Background in compliance-heavy environments (audit trails, PCI, KYC/AML)
Experience with agent context files (e.g., CLAUDE.md-style) and persistent-memory tooling for agents
