Senior Research Scientist | Voice AI in City of London

Meet DeepL. 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. 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.

The Voice team is at the heart of DeepL's next chapter. We are a dedicated group of experts across Research, Engineering, Product, and Design, on a mission to solve the art of the possible for real-time voice translation. We are looking for a seasoned Senior Research Scientist to help us tackle foundational challenges in this competitive and dynamic field. You will leverage our cutting-edge resources, including massive proprietary datasets and one of Europe’s most powerful supercomputers, to build the next generation of speech translation systems.

Your Challenge & Responsibilities

• Build and deploy custom, state-of-the-art AI models for transcription, voice translation, text-to-speech generation, and other challenging audio and text modalities.
• Train state-of-the-art neural networks at scale on DeepL's dedicated GPU clusters, pushing the boundaries of model performance and efficiency.
• Aggressively optimize our end-to-end voice AI technology for demanding, low-latency production environments where every millisecond counts.
• Work collaboratively within a large, world-class tech organization, integrating your research with a strong support structure of ML Platform, HPC, and DevOps teams to ship your work to millions.
• Lead research initiatives that advance our core understanding of neural networks and their mathematical optimization, directly impacting our product's quality and capabilities.
• 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

• We are seeking a researcher with a strong practical background, a creative mindset, and a passion for solving hard problems with real-world impact.
• You have a solid mathematical background and enjoy solving challenging problems, evidenced by a PhD or equivalent industry experience in mathematics, physics, computer science, or a related field.
• Proven experience building and shipping large-scale deep learning models to production environments.
• Deep practical experience in Python and at least one modern machine learning framework such as PyTorch, TensorFlow, or JAX.
• A track record of leading self-directed research projects that go well beyond academic exercises and deliver tangible results.
• High proficiency in English; knowledge of German or other languages is a plus.

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.
• Regular in-person team events: we bond through vibrant events that are as unique as our team.
• 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.
• Virtual Shares: An ownership mindset in every role.

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!