Senior Software Engineer | Backend

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. Building on a history of innovation, quality and security, DeepL continues to expand its offerings beyond the field of Language, including DeepL Agent - an autonomous AI assistant designed to transform the way businesses and knowledge workers get work done.

Founded in 2017 by CEO Jarek Kutylowski, DeepL now has over 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 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 on Linked In, Instagram, and our Blog.

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 Super

PODs to delivering real-time Language AI to over 100 million users and 100,000+ businesses globally.

We are shifting gears. We are moving from "Software-First" to "Product-First." We don't hire backend engineers just to build APIs or optimize database queries in isolation. We hire Missionaries
—builders who obsess over system reliability, massive scale, and the business impact of their architectural choices.

As a Senior Backend Engineer at DeepL, you will operate with the agency of a founder. Whether you are architecting our high-throughput billing engine, optimizing low-latency inference pipelines, or building the "nervous system" of our internal platform, you will own your domain end-to-end. You will join a high-performance culture that values shipping speed and system resilience over theoretical perfection.

• Architect for Ambiguity & Scale: You will design distributed systems that can handle 10x growth. You make high-stakes technical decisions—choosing between eventual consistency vs. strong consistency, or monolith vs. microservices—often with incomplete information, and you own the consequences.

• Own Revenue-Critical Systems: You won't just "implement endpoints." You will take full ownership of mission-critical services (e.g., Subscription Management, Identity, or API Gateways). You define the failure modes, the monitoring strategy, and the path to production.

• Bridge the Technical & Business Gap: You are bilingual in "Engineering" and "Business." You can translate complex backend constraints (like database locking strategies or latency costs) into business terms for Product Managers, ensuring we negotiate the right trade-offs to ship value fast.

• Drive Technical Pragmatism: You avoid "Resume-Driven Development." Whether working with our core stack (C#/.NET Core
  , Kubernetes
  , PostgreSQL
  ) or introducing new tools, you prioritize maintainability and simplicity. You write code that the team can read and debug at 2 AM,…