Lead/Principle Backend Engineer (Stablecoin Payments)

As a Lead/Principal Backend Engineer at Triple-A, you own the technical direction of our money-movement core: wallets, deposits, payouts, settlement, and balances. You lead the migration to a double-entry ledger, raise the reliability bar on the money path, and mentor a strong backend team while shipping code every week. Triple-A is a global payment institution licensed in the United States, Europe, and Singapore, trusted by over 1,000 enterprise customers including Razer, Farfetch, Alternative Airlines, and Grab.

What you'll do

• Own the architecture of our crypto payment gateway: checkout and payment pages, payment links, webhooks, and merchant APIs
• Architect and evolve stablecoin and crypto deposit, payout, refund, and settlement flows
• Lead the migration from counter-based balances to a ledger with zero financial drift
• Design resilient integrations with custody and liquidity providers
• Define high-level designs (HLDs) and review low-level designs (LLDs)
• Set standards for API design, idempotency, webhooks, testing, and observability
• Mentor engineers and partner with Product, Compliance, and Finance Ops teams

What you bring

• 8+ years in backend engineering, with 3+ years leading technical direction in payments, fintech, exchange, or custody
• Deep Node.js or Go experience in large, long-lived codebases
• Experience building or operating a payment gateway or payment service provider (PSP), including checkout, payment status lifecycle, refunds, and merchant webhooks
• A track record as a software architect or leading architecture and system design for production platforms
• Strong PostgreSQL expertise: transactions, concurrency, safe migrations, and performance tuning
• Proven design of idempotent, auditable money-movement and reconciliation systems
• Experience integrating third-party financial or custody APIs and signed webhooks
• A strong security mindset and clear written communication skills

Nice to have

• Rust or Go experience, or double-entry ledger experience
• Hands-on blockchain knowledge: UTXO and account-based chains, confirmations, fees, stablecoins on EVM, Tron, or Solana
• Familiarity with AWS, Docker, OpenTelemetry, Prometheus, or gRPC

What we offer

• Hybrid work based in Singapore
• Ownership of a high-impact domain in a regulated, growing crypto payments business

About Triple-A

Triple-A is a global payment institution licensed in the United States, Europe, and Singapore, specializing in stablecoin-based payment solutions. Trusted by over 1,000 enterprise customers, Triple-A enables businesses to reach digital currency owners, boost revenue, and optimize costs while managing conversion, custody, and compliance.