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 required

Digital 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.

You'll join as a foundational engineer in London, 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.

• 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.
• Developer-first: Empathy for end users; optimise for the "getting started" path.

• 5+ years building production software (libraries, services, or dev-tools a plus).
• Proficiency in at least two of: Java, C#/.NET, Python, TypeScript (Go a plus).
• 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.
• Exposure to OAuth/OIDC, mTLS, and PKI basics.
• Prior agency/consulting experience and/or regulated industries (finance, automotive, tech).
• Familiarity with developer portals and enterprise integration pipelines.

To apply, email with your CV and links (GitHub or relevant work). We'd love to see examples of libraries, services, or tools you've owned.