Senior Software Engineer | Full-Stack

MEET DEEPL DeepL is a global AI product and research company focused on building secure, intelligent solutions to complex business problems. Over 200,000 business customers and millions of individuals across 228 global markets today trust DeepL's Language AI platform for human-like translation, improved writing and real-time voice translation. Founded in 2017 by CEO Jaroslaw “Jarek” Kutylowski, DeepL now has around 1,000 passionate employees and is supported by world-renowned investors including Benchmark, IVP, and Index Ventures. Our goal is to become the global leader in trusted, intelligent AI technology, building products that drive better communication, foster connections, and create a meaningful impact. To achieve this, we need talented people like you to join our journey. If you’re ready to shape the future of AI and grow your career in a fast-moving, purpose-driven environment, DeepL is your next destination. WHAT SETS US APART What sets us apart is our blend of cutting-edge AI technology, meaningful work, and a culture where people truly thrive. We’re a team of innovators, researchers, and creators driven by a shared purpose to unlock human potential by making work simpler, smarter, and more connected. When we share what it’s like to work at DeepL, the reactions are overwhelmingly positive. This might be because of our technology that helps millions of people and businesses communicate and work better every day, or because of the trust, curiosity, and care that shape our culture. What we know for sure is this: being part of DeepL means joining a team dedicated to innovation, growth, and well-being. Discover more about life at DeepL onLinkedIn https://www.linkedin.com/company/deepl/,Instagram https://www.instagram.com/deepl_official/, and our Blog https://www.deepl.com/en/blog. MEET THE TEAM BEHIND THIS JOURNEY DeepL is not just a translation tool; we are building the Operating System for Global Communication. We are the rare AI company that builds the entire stack in-house: from training next-gen LLMs on our own NVIDIA DGX SuperPODs to delivering real-time Language AI to over 300 million users and 200,000+ businesses globally. We are shifting gears. We are moving from "Software-First" to "Product-First." We don't hire engineers to just close tickets or optimize algorithms in isolation. We hire Missionaries—builders who obsess over the Why before the How. As a Senior Engineer at DeepL, you will operate with the agency of a founder. You will join a high-performance engineering culture that values shipping speed, system reliability, and direct business impact over theoretical perfection, whether you are building our next-gen Voice API, architecting our massive billing engine, or scaling our core product platform, you will own your domain end-to-end. YOUR RESPONSIBILITIES - Own the Outcome, Not Just the Code: You will move beyond "implementing specs." You will own revenue-critical systems from the initial problem definition through to architectural design, deployment, and production reliability. You measure success by user impact, not just pull requests merged . - Architect for Ambiguity: You will make high-stakes technical decisions (monolith vs. microservice, consistency vs. availability) with incomplete information. You don't wait for perfect requirements; you identify risks, build prototypes, and iterate based on real-world feedback. - Bridge the Gap: You will be bilingual in "Engineering" and "Business." You will translate complex technical constraints (latency, eventual consistency) into business terms for Product Managers, ensuring we negotiate the right trade-offs to ship value faster . - Drive Technical Pragmatism: You will avoid "Resume-Driven Development." Whether using our core stack (C#/.NET Core, Python, Kubernetes, React) or exploring new tools, you choose the technology that solves the customer problem most effectively, ensuring long-term maintainability over short-term trends. QUALITIES WE LOOK FOR - A "…