Senior Software Engineer | Enterprise | Backend in London

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.

You will join the Business Acceleration Track (BAT). This is the team responsible for the "Financial Nervous System" of DeepL. We are architecting the platform that manages Identity, Access, and Monetization for millions of users and global enterprises. This is Hard Tech. We are moving upmarket, which means handling massive scale, complex tiered licensing, and strict security requirements. You won’t just be building CRUD APIs; you will be designing distributed systems that handle high-frequency transactions, ensure data consistency across microservices, and protect our revenue streams from fraud. You will operate with the agency of a founder, owning the reliability and scalability of DeepL's core business logic.

Your responsibilities:

• Architect for Consistency & Scale: You will design the backend systems for Identity (SSO/SCIM) and Billing. You will make high-stakes trade-offs between eventual consistency and strict ACID transactions in a distributed environment.
• Own Data Integrity: You are the guardian of our revenue data. You ensure that our ledgers are immutable, our access controls are secure, and our systems are auditable. You design for failure, ensuring no transaction is ever lost.
• Decompose Complexity: You will take messy, ambiguous business requirements (e.g., "Allow mixed-license teams with varying expiration dates") and turn them into clean, maintainable backend architecture.
• Drive Technical Excellence: You will mentor the team on best practices for C#/.NET Core, gRPC, and Event-Driven Architecture (Kafka). You set the standard for code reviews and system design.

Qualities we look for:

• A "Distributed Systems" Mindset: You understand the challenges of microservices, idempotency, and distributed locking. You know how to prevent race conditions in a billing system handling thousands of concurrent requests.
• Domain Mastery (or Curiosity): You have experience with (or a deep desire to master) IAM (Identity Access Management), Fraud Prevention, or Fintech/Billing architectures. You understand that these are engineering problems, not just "admin tasks".
• High Agency: You proactively identify risks—whether it's a security vulnerability or a scaling bottleneck—and you fix them before they become incidents.
• Pragmatic Architect: You don’t over-engineer. You choose the boring, reliable solution (e.g., Postgres) over the shiny new tool, because you know stability is the most important feature of a financial system.
• AI-Native Velocity: You leverage AI-powered tools (like GitHub Copilot or Claude) to accelerate your velocity and eliminate repetitive toil. You use AI for boilerplate code, test generation, and debugging, allowing you to focus your cognitive energy on high-value architectural decisions and complex problem-solving.

A Note on Our Hiring Process:

DeepL hires for the Company, not just a specific team. We operate a Unified Engineering Pipeline. If you pass our bar, we will match you to the highest-priority role that fits your skillset—whether that is in Core Product, Platform, Voice, or Enterprise. We prioritize "Missionaries" who want to solve the biggest problems, wherever they live in the stack.

What we offer:

• Diverse and internationally distributed team: joining our team means becoming part of a large, global community with people of more than 90 nationalities. We’re more than just colleagues; we’re a group of professionals with a shared mission to connect diverse cultures.
• Open communication, regular feedback: as a language-focused company, we value the importance of clear, honest communication. We value smooth collaboration, direct and actionable feedback, and believe that leading with empathy and growth mindset makes us better together.
• Hybrid work, flexible hours: we offer a hybrid work schedule, with team members coming into the office twice a week. This allows you to engage directly with your team and experience the unique energy of our workspace, while still enjoying the flexibility and comfort of working from home.
• Virtual Shares: An ownership mindset in every role. We believe everyone should share in our success, and that’s why every employee receives Virtual Shares, linking your contribution directly to DeepL’s growth and rewarding you with a stake in our future.
• Regular in-person team events: we bond over vibrant events that are as unique as our team, from local team and business unit gatherings, to new-joiner onboardings, to company-wide events that bring us all together.
• Monthly full-day hacking sessions: every month, we have Hack Fridays, where you can spend your time diving into a project you’re passionate about and get the opportunity to work with other teams.
• 30 days of annual leave: we value your peace of mind. With 30 days off (excluding public holidays) and access to mental health resources, we make sure you’re as strong mentally as you are professionally.
• Competitive benefits: just as our team spans the globe, so does our benefits package. We’ve crafted it to reflect the diversity of our team and tailored it to align with your unique location.

If this role and our mission resonate with you, but you’re hesitant because you don’t check all the boxes, don’t let that hold you back. At DeepL, it’s all about the value you bring and the growth we can foster together. Go ahead, apply—let’s discover your potential together. We can’t wait to meet you!

We are an equal opportunity employer. You are welcome at DeepL for who you are—we appreciate authenticity here. Our product is for everyone, and so is our workplace. The more voices we have represented and amplified in our business, the more we will all succeed, contribute, and think forward!