Lead/Principle Backend Engineer (Stablecoin Payments)

Triple A (M) Sdn Bhd; Singapore; On-site; SGD 180,000 - 240,000; Full time

Job summary

Triple A (M) Sdn Bhd is seeking a hands-on Lead/Principal Engineer to own the technical direction of its money-movement core, including wallets, deposits, payouts, settlement and balances. You will push toward a double-entry ledger, raise reliability on the money path, and mentor a strong backend team while shipping code weekly.

You will lead architecture for the crypto payment gateway, evolve stablecoin flows, and migrate to a ledger with zero drift, while building resilient integrations with

Qualifications

• 8+ years in backend engineering, 3+ 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 PSP (checkout, payment status lifecycle, refunds, merchant webhooks).
• Track record as a software architect, or leading architecture and system design for production platforms.
• Strong PostgreSQL: transactions, concurrency, safe migrations, performance tuning.
• Proven design of idempotent, auditable money-movement and reconciliation systems.
• Experience integrating third-party financial or custody APIs and signed webhooks.
• Strong security mindset and clear written communication.

Responsibilities

• Own the architecture of our crypto payment gateway: checkout and payment pages, payment links, webhooks and merchant APIs
• Architect and evolve stablecoin/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 HLDs and review LLDs
• Set standards for API design, idempotency, webhooks, testing and observability
• Mentor engineers and partner with Product, Compliance and Finance Ops

Skills

Node.js

Go

Payments architecture

Tools

PostgreSQL

AWS

Docker

Job description

About the role

We are looking for a hands-on Lead/Principal Engineer to own the technical direction of our money-movement core: wallets, deposits, payouts, settlement and balances. You will lead our move to a double-entry ledger, raise the reliability bar on the money path, and mentor a strong backend team, while still shipping code every week.

Responsibilities

• Own the architecture of our crypto payment gateway: checkout and payment pages, payment links, webhooks and merchant APIs
• Architect and evolve stablecoin/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 HLDs and review LLDs
• Set standards for API design, idempotency, webhooks, testing and observability
• Mentor engineers and partner with Product, Compliance and Finance Ops
  

Requirements

• 8+ years in backend engineering, 3+ 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 PSP (checkout, payment status lifecycle, refunds, merchant webhooks)
• Track record as a software architect, or leading architecture and system design for production platforms
• Strong PostgreSQL: transactions, concurrency, safe migrations, performance tuning
• Proven design of idempotent, auditable money-movement and reconciliation systems
• Experience integrating third-party financial or custody APIs and signed webhooks
• Strong security mindset and clear written communication
  

Nice to have

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

Our stack

TypeScript, PostgreSQL, REST / gRPC / WebSocket, AWS, Docker, Redis, NATS, OpenTelemetry, Ledger services.

Why join us

• Own a high-impact domain in a regulated, growing crypto payments business
• Work on real problems: ledgers, multi-chain settlement, card-network and exchange integrations