Senior Software Engineer (Retain) in London

Requirements

• Constructive and thoughtful; contribute ideas, be receptive to feedback and proactively improve code and team processes through CI/CD, tooling and code reviews.
• Hands-on production experience building services in TypeScript; write typed, maintainable code and own delivery.
• Strong PostgreSQL skills: schema, SQL, indexing, performance and migrations.
• Experience designing and operating distributed services in AWS, making pragmatic scalability, observability, reliability and cost trade-offs.
• Thoughtful approach to testing and the full development lifecycle; shape code, deployment, maintenance and operational runbooks, with serverless experience.
• Comfortable collaborating with product and business stakeholders to translate needs into technical scope and deliver owned features.
• Define and track success metrics for product outcomes; navigate complex, ambiguous problems while keeping high standards, bias for action and customer focus.

(Desirable)

• Awareness of various architectural approaches, especially within serverless environments and the benefits and limitations of Layered Architecture.
• Understanding of how infrastructure and application layers work together to optimise your solutions.
• Knowledge of functional programming concepts.
• SQS and EventBridge as transport services with an interest in stream processing and queue optimisation.

What the job involves

• Join Flock as a Senior Software Engineer on our Retain team, where you'll play a pivotal role in building and developing the services that help our fleet customers see the value of Flock, embed us into their daily workflow, and operate safer, more profitable fleets.
• Lead design, build and operation of critical backend services for the Retain team.
• Write high-quality, well-tested TypeScript, shape PostgreSQL schemas and own delivery to production.
• Drive architecture and platform decisions for scalable, reliable and cost-effective AWS services.
• Make pragmatic trade-offs and introduce patterns that improve maintainability and operability.
• Work closely with product, data and commercial teams to translate needs into technical scope, define success metrics and guide trade-offs to deliver measurable, customer-focused outcomes.
• Lead by example through code and design discussions, mentoring and pairing.
• Encourage practical testing, CI/CD, type-safe APIs and pragmatic functional patterns to raise standards and shape long-term direction.
• As a Senior Engineer at Flock you will own problems end to end, from design and build to deployment and measuring impact, working with engineers to keep our codebase clean and maintainable.
• Integrate with and contribute to the development of RESTful APIs exposed via API Gateway.
• Collaborate with backend engineers to shape APIs that efficiently serve data-intensive views.
• Use your AWS experience (SQS, Lambda, API Gateway, S3, EventBridge, CloudWatch) to support and extend the telemetry data ingestion and delivery pipeline.
• Work with infrastructure-as-code tools like Terraform or CDK for provisioning long-lived resources.
• Work closely with product managers and engineers to scope, deliver, and test features.
• Participate in daily standups, sprint planning, and retrospectives in our Agile process.
• Deliver high-quality, well-tested code and raise the team’s standards by contributing to and leading code reviews, pairing sessions and design discussions — mentoring and supporting other engineers through practical, technical feedback.
• Share your knowledge and support the growth of engineers across the team, act as a force-multiplier by driving best practices and shaping long-term technical decisions for our engineering community.
• Working hand-in-hand with your product manager, you’ll bring clarity to complex problems and help define sharply scoped, impactful deliverables.
• Your success won’t be measured by output alone, but by the lasting impact you make on our customers and on the team around you.