Backend Software Engineer | Customisation in London

Meet DeepL. DeepL is a global communications platform powered by Language AI. Since 2017, we have been on a mission to break down language barriers. Our human-sounding translations and intelligent writing suggestions are designed with enterprise security in mind. Today, they enable over 100,000 businesses to transform communications, reach new markets, and improve productivity. 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 is our blend of modern technology, competitive benefits, and an open, welcoming work culture that enables our people to thrive. When we share what it’s like to work at DeepL, the reactions are overwhelmingly positive. This may be because of our products that have helped countless people worldwide or our shared mission to improve communication for individuals and businesses, bringing cultures closer together. What we know for sure is this: being part of DeepL means joining a team dedicated to innovation and employee well-being.

DeepL has millions of passionate users around the globe, including a growing number of Enterprise teams that depend on workflows that allow for consistent and compliant communication. Our Customization team’s mission is to deliver the features these teams need, ensuring smoother, faster processes and reducing the need for multiple external tools. By offering intuitive customization features that both enable formatting and styling communication, and enforcing guidelines for compliance, we drive habit-formation and retention, making DeepL the go-to platform for all content refinement tasks.

In this role, you will partner with product managers, designers, researchers and fellow engineers to design and maintain the backend services powering our customization features. As a Senior Backend Engineer, your expertise in building scalable systems using modern technologies (such as C# and .NET Core) will be instrumental in enabling these features horizontally across our products - Translate, Voice and APs. Your contributions will help shape the technical architecture underpinning customization workflows, ensuring enterprise users can efficiently deliver high-quality content. By continuously improving these core services, you’ll play a key part in establishing DeepL as an essential component of team-based content creation worldwide.

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: You’ll ensure the reliability and availability of our services by being available to join the team’s shared on-call rotation as needed.

Qualities we look for:

• Proficiency in a modern programming language with solid experience in backend development.
• Exposure to or familiarity with our tech stack (C#, .NET Core, gRPC) or similar technologies would be beneficial but is not a strict requirement.
• Experience in building and maintaining business-critical applications.
• Solid understanding of algorithmic complexity and common data structures.
• Effective and pragmatic: you can weigh between "perfect" and "good enough" depending on priorities and business impact.
• The ability to explain complex ideas and designs to developers and stakeholders with a wide variety of experiences and backgrounds.
• Product mindset: you develop solutions with the customer in mind and iteratively improve your solutions based on data and feedback.
• You are a role model for continuous delivery.
• Comfortable with a hybrid working model and able to come into our London office regularly (2x per week average).
• Fluent in English.

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.
• Open communication, regular feedback: as a language-focused company, we value the importance of clear, honest communication.
• Hybrid work, flexible hours: we offer a hybrid work schedule, with team members coming into the office twice a week.
• 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.
• 30 days of annual leave: we value your peace of mind.
• Competitive benefits: 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.