Senior Software Engineer London

2 days a week in Paddington WeWork (2 Eastbourne Terrace, London W2 6LG) - Monday & Wednesday 3 days a week WFH (flexible Fridays to come in) Travel to client offices as requiredDigital Speed is a full-service product and engineering agency delivering strategy, design, and development for global clients. Our expertise spans Brand, Discovery, UX/UI, and Full-Stack Engineering, alongside product strategy and marketing. We partner with organisations in finance, automotive, sport, and technology to ship dependable, high-quality outcomes at scale.We are driven by 4 key values: Open - We arrive with options, welcome feedback, and find the best way forward together. Thriving - New challenges energise us; we learn and improve as a team. Experts - Specialists who care about their craft and deliver results with structure. Caring - We take our clients' goals as seriously as our own and build trusted relationships. Characteristics Requirements 5+ years building production software (libraries, services, or dev-tools a plus). Proficiency in Java & TypeScript. Skills in C#/.NET, Python & Go are a bonus. Solid grasp of modern API and integration patterns. Comfortable with CI/CD (GitHub Actions and/or Jenkins), git, and code review. Experience publishing artifacts and managing repos (Maven, NuGet, PyPI, Nexus/Artifactory). Working knowledge of semantic versioning, release notes, and changelog hygiene. Basic security hygiene: artifact signing, checksums, SBOM mindset. Right to work in the UK; fluent in written and spoken English. Desirable Extras Go (concurrency patterns), idiomatic TypeScript design. Docs-as-code, ADRs, conformance/contract testing, mock servers. Exposure to OAuth/OIDC, mTLS, and PKI basics. Cloud & infra awareness (AWS/Azure/GCP, containers, runners). Prior agency/consulting experience and/or regulated industries.You'll join as a full-stack engineer in London, that leans more in to back-end. Working closely with agency leadership and client architecture teams. You'll shape high-quality engineering practices: building reusable components, ensuring strong pipelines, and delivering production-ready software that can be confidently handed over. This is a role for someone who enjoys breadth and ownership: context-switching across languages, improving pipelines, and collaborating across teams. Responsibilities Core Engineering: Design and build robust, reusable services and libraries across multiple languages (Java, .NET, Python, TypeScript, Go). Architecture & Review: Analyse requirements, propose technical approaches, and lead peer reviews to maintain high standards. CI/CD & Quality Gates: Implement and refine pipelines with linting, tests/coverage, artifact signing, and versioning discipline. Release Management: Ensure clean, traceable, and secure releases across environments, with strong changelog hygiene. Integration: Build services that are observable, resilient, and easy to consume across teams and systems. Collaboration & Handover: Work with client Architecture/Platform teams; produce documentation, run-books, and recorded walkthroughs. Continuous Improvement: Optimise build times, automate repeatable tasks, and keep outputs deterministic and reproducible. Simplify: Turn messy requirements into clear, repeatable systems. High-performance: Care about reliability, observability, and regression safety. Collaborative: Give/receive reviews; document decisions; unblock others. First-principles: Handle ambiguity and make trade-offs explicit. Ownership: Proactive, organised, and comfortable leading end-to-end.