Senior Software Engineer, Partner Integrations

Role overview We are looking for a Senior Software Engineer to design, build and run backend services that connect our platform with external partners. You will work with product, architecture, security and operations to turn partner requirements into reliable, well-tested services. This is a hands-on backend role in TypeScript on AWS. You will own outcomes from design through production, and you will help raise the engineering standard across the team. 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.

Requirements 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 You are a pragmatic engineer who designs for failure as well as success. You think about what happens when a request times out, when a message is delivered twice, or when an operator must recover a record under pressure. You care about correctness, auditability and clear ownership, and you are comfortable being the person who asks for more evidence before a change goes live.

Benefits Competitive salary. Market-standard EOSB and health insurance. Work with elite, high-performance engineering teams building globally used trading systems. Team-building events, mentorship, and opportunities for continuous professional growth. Location: Remote, based in the UAE. Client is in the UK and works UK hours- so some alignment in working hours is preferred. Sumara will sponsor a UAE visa and work permit.