Senior Software Engineer, Partner Integrations

Role overview

What you will do

• Design and build event-driven, serverless and containerised services on AWS.
  
• Integrate with third-party REST APIs, including authentication, retries, rate limits and error classification.
  
• Build secure inbound endpoints that verify signatures, handle duplicate delivery and acknowledge work safely.
  
• Design failure handling for partial and uncertain outcomes, including dead-letter queues, recovery and operator procedures.
  
• Define and evolve versioned API and event contracts that stay backward compatible for consuming teams.
  
• Handle personal and financial data responsibly, covering data minimisation, encryption, redaction in logs and retention.
  
• Build and maintain infrastructure as code and CI/CD pipelines, with automated unit, contract and behaviour tests.
  
• Set up observability, including structured logs, metrics, tracing, alarms and runbooks.
  
• Support partner onboarding, sandbox testing and go-live readiness.
  
• Review designs and code from other engineers, and document decisions clearly.
  

Essential experience

• Commercial backend development experience in TypeScript or a similar typed language, including production services.
  
• Experience building and operating distributed or event-driven systems, including queues, retries and idempotency.
  
• Hands-on experience with AWS serverless or containerised workloads and infrastructure as code.
  
• Experience integrating with third-party APIs, including authentication, versioning and error handling.
  
• Strong testing discipline, with the ability to design tests that catch real defects.
  
• Experience owning production systems, including incident response and post-incident improvement.
  

Desirable experience

• Experience with webhook-based integrations or HTTP message signing.
  
• Experience with OAuth 2.0 or other delegated authorisation models.
  
• Experience in a regulated domain such as financial services, payments or identity.
  
• Familiarity with schema-first design (for example zod, OpenAPI or AsyncAPI).
  
• Experience with Kotlin or other JVM languages.
  
• Experience with CI/CD tooling such as GitHub Actions.
  

Interpersonal and management skills

• Communication: explain technical trade-offs and risks clearly to non-engineers, and write concise design documents and runbooks.
  
• Stakeholder management: build trust with partners and internal teams, set realistic expectations and surface blockers early.
  
• Ownership and judgement: take responsibility for production outcomes, make sound decisions under uncertainty, and say clearly when something is not ready to ship.
  
• Mentoring and collaboration: coach engineers through design and code review, and share knowledge openly.
  
• Workstream leadership: sequence work across dependencies, drive decisions to closure and keep progress visible.
  
• Adaptability: work effectively with ambiguous requirements and changing partner APIs.
  

What we are looking for