Senior Software Engineer, Backend & API Integrations at Reap

London, England, United Kingdom -

Full Time

Start Date

Immediate

Expiry Date

16 Aug, 26

Salary

0.0

Posted On

18 May, 26

Experience

5 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

Backend Engineering, API Integration, TypeScript, Node.js, NestJS, AWS, REST APIs, Webhooks, Event-Driven Architecture, Idempotency, Error Handling, Technical Leadership, System Design, Observability, Fintech, Stablecoins

Industry

Information Technology & Services

Description

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 After submitting your application, please check your inbox for a confirmation email. 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Responsibilities

Own and deliver deep, bidirectional technical integrations between Reap and strategic financial partners. This includes designing fault-tolerant architectures, managing API contracts, and ensuring production reliability through observability and incident response.