Senior Software Engineer, Backend & API Integrations
About Reap
Reap is a global financial technology company headquartered in Hong Kong with employees across multiple countries. We enable financial connectivity and access for businesses worldwide by combining traditional finance with stablecoins for efficient money movement. Through our stablecoin-powered corporate cards, payments, and expense management tools, we streamline financial operations and help businesses scale.
Our APIs enable businesses to integrate stablecoin-enabled finance into their own products and services—from issuing Visa cards to facilitating cross-border payments. Backed by leading investors including Acorn Pacific, Index Ventures and HashKey Capital, Reap is building the future of borderless, stablecoin-enabled finance.
About the Role
You will be embedded at the intersection of Reap's engineering team and a strategic financial partner — to own and deliver a deep, bidirectional technical integration between the two platforms. This isn't a typical backend role. You'll operate like a technical lead on a mission-critical partnership: designing and building integration systems, working directly with the partner’s engineers, surfacing requirements back into Reap's product and engineering teams, and ensuring the integration runs reliably in production.
What You’ll Do
Own the end-to-end technical integration between Reap and the partner — including design, implementation, testing, deployment, and ongoing maintenance
Build and operate bidirectional data flows: inbound (partner → Reap: funding, settlement, account events) and outbound (Reap → partner: card events, transaction data, reconciliation signals)
Serve as Reap's primary technical point of contact with the partner's engineering team — attending syncs, reviewing their API specs, and driving alignment on integration contracts
Translate the partner's technical requirements and constraints into well-scoped engineering work inside Reap's systems
Collaborate closely with internal Reap teams — Card, Treasury, Onboarding, Compliance — to ensure integration requirements are correctly surfaced and delivered
Monitor integration health in production; own incident response for integration-layer issues
Maintain thorough integration documentation: API contracts, data flow diagrams, runbooks, and change logs
Integration Design & Delivery
Design robust, fault-tolerant bidirectional integration architecture between Reap and our partner
Implement APIs, webhooks, event consumers, and data transformation layers
Ensure data consistency, idempotency, and auditability across integration boundaries
Build test suites covering integration contracts and edge cases
Partner Collaboration
Maintain a close working relationship with partner's engineering and product teams
Drive joint technical decision-making on integration patterns, versioning, and deprecation
Proactively surface blockers and misalignments before they become production issues
Cross-Team Coordination (Reap-side)
Work with Card, Treasury, Onboarding, and Compliance engineers to deliver integration dependencies
Translate external partner requirements into well-defined internal engineering tasks
Represent the integration workstream in Reap engineering planning and reviews
Production Reliability
Own observability for the integration layer: dashboards, alerting, and SLA tracking
Lead incident response and post-mortem processes for integration-related issues
Continuously improve integration stability and reduce operational toil
What We’re Looking For
6+ years of backend software engineering experience
Proven experience building and operating production-grade API integrations with external partners or third-party systems
Strong understanding of integration patterns: REST APIs, webhooks, event-driven architecture, idempotency, retry logic, and error handling
Experience working across organisational boundaries — with partner or client engineering teams
Comfortable operating in ambiguity: translating loosely defined requirements into concrete engineering solutions
Clear written and verbal communication; able to represent technical decisions to both engineering and business stakeholders
Our main stack is TypeScript, Node.js, NestJS, and AWS — but we value strong engineering fundamentals over any specific toolset
Nice to Have
Experience in fintech, payments, crypto, or financial services integrations
Familiarity with settlement flows, reconciliation systems, or card transaction data models
Experience working in a forward-deployed or embedded engineering capacity with external partners
Knowledge of EU financial regulations relevant to payments or card programs (PSD2, GDPR)
Familiarity with observability tools (e.g., New Relic, Datadog, OpenTelemetry)
Bonus: experience with stablecoin or crypto payment rails
Your Adventure Benefits
High-ownership, high-impact role at the frontier of stablecoin-powered finance
Work directly with strategic partners and shape how Reap expands its financial ecosystem
Operate with significant autonomy as Reap's technical owner of a key partnership
Join a high-caliber team across engineering, product, and operations
Insurance coverage after probation
Reap Card stipend
Use of AI tools at work — and the space to learn, experiment, and grow with them
A culture of innovation, inclusion, and continuous learning
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