Senior Backend Engineer - Payments

Stack

Responsibilities

• ▹Build and own the connector and adapter layer so adding or replacing a provider is configuration and a thin adapter, not a new integration
• ▹Migrate payment methods from redirect flows to server-to-server and embedded flows, and measure the result
• ▹Own everything downstream of the orchestration layer: reconciliation, transaction status handling, method configuration and payment flows into the client portal
• ▹Make transaction status reliable end to end through active polling, idempotent processing and reconciliation
• ▹Build observability over transaction status and provider performance
• ▹Specify the behaviour needed from the orchestration platform: transaction state machine, idempotency, polling, routing and cascading rules
• ▹Support integration work for the card programme
• ▹Extend the integration set to acquired entities as configuration

Requirements

• ▹5+ years in backend engineering, strong in TypeScript and Node.js, comfortable with relational databases
• ▹Production experience with payment systems: authorisation, callbacks, refunds, reconciliation and retry behaviour
• ▹Practical understanding of idempotency, asynchronous status handling, transaction state machines and designing for partial failure
• ▹Experience integrating third-party APIs of uneven quality, including working directly with a provider's integration team
• ▹Ability to own a service: architecture decisions, standards and root cause fixes

Nice to have

• ▹Exposure to .NET for work touching the client portal
• ▹Experience with APM and local rails in Asia, Africa or LATAM
• ▹Experience with bank transfer rails, virtual accounts, QR-based methods, mobile money
• ▹Event-driven patterns in production: transactional outbox, idempotent consumers, sagas
• ▹Background in brokerage, crypto payments, orchestration or another high-volume payments environment
• ▹Active use of AI tooling in daily work
• ▹Ability to work independently; proactive mindset

Soft skills

About the company

An international broker whose clients fund and withdraw through roughly 60 payment methods across Asia, Africa, LATAM and the Middle East.