Senior Software Engineer, Backend – API Integrations

Role Overview

• 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
• 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
• 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
• Work with Card, Treasury, Onboarding, and Compliance engineers to deliver integration dependencies
• Represent the integration workstream in Reap engineering planning and reviews
• 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

Requirements

• 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

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