Senior Software Engineer

Salary: £60,000 - 100,000 per year Requirements: • We look for a system thinker who understands failure modes, system boundaries, and how code impacts architecture at scale. • We value high agency and a bias for action, with the ability to unblock yourself and the team in a fast-paced environment. • We want someone with strong product fluency who cares about user needs and has a track record of shipping features that solve real business problems. • We value polyglot and adaptable engineers who can pick up the right tool for the job and work across the full stack. • Experience with C#/.NET Core or React is a bonus. • We value engineers who use AI-powered tools to accelerate delivery and reduce repetitive work. Responsibilities: • Own revenue-critical systems from problem definition through architectural design, deployment, and production reliability. • Make high-stakes technical decisions with incomplete information by identifying risks, building prototypes, and iterating from real-world feedback. • Translate complex technical constraints into business terms for Product Managers so we can make the right trade-offs and ship value faster. • Choose technologies that solve customer problems effectively and support long-term maintainability. • Build across our stack as needed, including core product, platform, voice, and enterprise areas. • Leverage AI-powered tools for boilerplate code, test generation, debugging, and other repetitive tasks. Technologies: • AI • C# • Support • React • ASP.NET • API • Architect • Copilot • GitHub • Kubernetes • Network • Python • UX UI Design More: We are DeepL, a global AI product and research company building secure, intelligent solutions for complex business problems and trusted by over 200,000 business customers and millions of individuals across 228 global markets. We are building the Operating System for Global Communication and developing the full stack in-house, from next-generation LLMs to real-time Language AI. Our team is passionate, high-performing, and internationally distributed across more than 90 nationalities, with employees based in the UK, Germany, the Netherlands, Poland, the US, and Japan. We offer a hybrid work model with two office days per week, flexible hours, open communication, regular feedback, virtual shares, monthly Hack Fridays, regular in-person team events, 30 days of annual leave, mental health resources, and competitive location-tailored benefits. This role is based in London within our Engineering department. last updated 36 week of 2026