Backend Software Engineer | Convert & Scale in City of London

DeepL is a global communications platform powered by Language AI. Since 2017, we’ve been on a mission to break down language barriers. Our human‑sounding translations and intelligent writing suggestions are designed with enterprise security in mind. They enable over 100,000 businesses to transform communications, reach new markets, and improve productivity, while also empowering millions of individuals worldwide to make sense of the world and express their ideas. Our goal is to become the global leader in Language AI, building products that drive better communication, foster connections, and make a real‑life impact.

What Sets Us Apart

We blend modern technology, competitive benefits, and an open, welcoming work culture that enables our people to thrive. Our products have helped countless people worldwide, and our mission to improve communication for individuals and businesses brings cultures closer together. Being part of DeepL means joining a team dedicated to innovation and employee well‑being.

You will be working as part of the Convert & Scale Track (CAST) in DeepL’s engineering department, specifically in Subscription Management and Sales Automation. CAST’s mission is to accelerate DeepL’s growth by maximizing the number of customers who buy our products and enabling them to scale to any size. We are 50 people working on diverse topics ranging from identity and subscription management to customer onboarding and expansion. We are currently looking to strengthen our team in subscription management, with the goal of improving our sales‑assisted customer acquisition and expansion flows through automation.

Your Responsibilities

• Design, implement and maintain features in our microservices in a hybrid cloud environment.
• Contribute to the implementation of end‑to‑end solutions: design, build and deliver in collaboration with multiple engineering teams.
• Increase the maintainability, reliability, and robustness of our software.
• Continuously improve and automate our development processes.
• Contribute to our backend developer community and share knowledge within and across teams.
• Take total ownership of the work you deliver, from testing and QA to post‑deployment monitoring and incident resolution.
• Participate in our on‑call rotation, ensuring the reliability and availability of our services.

Qualities we look for

• Proficiency in a modern programming language with solid experience in backend development.
• Familiarity with our tech stack (C#, .NET Core, PostgreSQL, Grafana, Kubernetes, Kafka) is desirable but not required.
• A willingness to learn new technologies quickly is essential.
• Experience building, scaling, and maintaining business‑critical applications.
• Solid understanding of algorithmic complexity and common data structures.
• Pragmatic thinking, weighing between ‘perfect’ and ‘good enough’ based on priorities and business impact.
• Ability to explain complex ideas and designs to developers and stakeholders with varied backgrounds.
• Capacity to balance short‑term deliverables with long‑term product vision, ensuring product evolution aligns with user and business goals.
• Understanding of observability, metrics, and managing an application throughout its lifecycle.
• User‑centric mindset: deep user empathy, ownership of user data, and eagerness to make a direct impact on the user experience.
• Continuous learning mindset—openness to trying different approaches and adapting to new technologies.
• Fluent in English.
• Comfortable with a hybrid working model and able to come into any of our offices regularly (≈2× per week).

What We Offer

• Diverse, internationally distributed team—over 90 nationalities across the UK, Germany, the Netherlands, Poland, the US, and Japan.
• Open communication and regular feedback, focusing on clear, honest collaboration with an empathetic, growth‑mindset culture.
• Hybrid work schedule with flexible hours and trust in productivity.
• Virtual Shares—every employee receives Virtual Shares that link your contribution directly to DeepL’s growth.
• Regular in‑person team events, from local gatherings to company‑wide celebrations.
• Monthly full‑day hacking sessions (Hack Fridays) to explore projects you’re passionate about.
• 30 days of annual leave (excluding public holidays), plus access to mental health resources.
• Competitive benefits tailored to each employee’s location and needs.

We are an equal opportunity employer. We welcome you 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. Bring us your personal experience, perspectives, and background; it’s in our diversity that we find the power to break down language barriers in the world.