Codex - Software Engineer, Singapore
Requirements
• 3 to 5 years of backend engineering experience, with meaningful depth in at least one of: payments/rails or compliance/onboarding • Strong system design instincts; you've built systems that handle failure gracefully and scale without becoming a maintenance burden • Experience working cross-functionally with compliance, legal, or operations teams • Comfortable with ambiguity — you can take a regulatory requirement or a business need and turn it into a well-designed technical spec • Someone who takes full ownership and moves fast without cutting corners • Familiarity with both payment rails and compliance frameworks • Experience in crypto or stablecoin infrastructure — on-chain settlement, blockchain analytics tooling • Prior startup or scale-up experience where broad scope was the norm, not the exception
Responsibilities
• 3P & Payment Integrations • Own the technical integration of third-party payment providers, including offramp/payout flows, API integration, and sandbox/testnet testing • Design and implement the architecture for how 1P and 3P flows interact, with careful consideration of coupling, maintainability, and risk • Integrate payment rails across the globe — banks, PSPs, and liquidity providers • Build the document storage and invoice pipeline to support 3P operational workflows • Coordinate with Legal and Compliance on open questions arising from 3P integration (e.g. balance holding, regulatory implications) • Settlement, Reconciliation & Stablecoin • Build and maintain settlement, reconciliation, and ledger systems across fiat and crypto flows • Build stablecoin on/off-ramp flows and the crypto-specific compliance tooling that supports them • Backend Architecture • Lead significant backend refactors to improve system correctness and maintainability • Design and maintain order management systems: cancellation logic, state validation, and payout flows for orders with pending manual payouts • Build internal ops tooling to surface pending manual payout queues to non-engineering teams, reducing trader workload • Onboarding & Compliance Infrastructure • Build and maintain end-to-end onboarding infrastructure — KYC/KYB flows, identity verification integrations, and risk scoring • Own the KYT integration layer across fiat and crypto deposit and order workflows, in coordination with the Compliance team • Build transaction monitoring, AML, and sanctions screening systems • Maintain compliance data infrastructure — audit logs, reporting pipelines, and regulatory submissions • Implement KYT layering across 3P flows and contribute to design decisions on when and how it applies
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