Senior Research Scientist Voice

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, and empower millions of individuals worldwide to make sense of the world and express their ideas.

What sets us apart is our blend of 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 shared mission to improve communication brings cultures closer together. Being part of DeepL means joining a team dedicated to innovation and employee well‑being. Discover what our teams have to say about life at DeepL on Linked In, Instagram and our Blog.

DeepL Voice is defining the future of real‑time multilingual communication. Built on the foundation of DeepL’s world‑leading translation quality, the Voice Track brings together cross‑functional teams across Research, Engineering, and Product to push the boundaries of what is possible in speech‑to‑speech interpretation. In just two years, we have launched our first customer‑facing features and built reliable real‑time systems for meetings, live communication and developer integrations.

We are now scaling up our research efforts to invent the next generation of audio, speech and multimodal translation technologies.

We’re looking for a Senior Staff Research Scientist to lead scientific innovation across our speech and translation models. This is a high‑impact, hands‑on role for a research leader who can define long‑term scientific strategy, prototype rapidly, run large‑scale experiments, and drive breakthroughs right into production.

• Lead hands‑on research and development across ASR, MT, TTS, and speech‑to‑speech translation for real‑time voice products.
• Design, train and optimise large‑scale ASR models for multilingual accuracy, robustness and ultra‑low‑latency streaming.
• Improve cascaded translation pipelines end‑to‑end: segmentation, ASR‑MT interfaces, streaming MT inference and incremental decoding.
• Develop and refine real‑time TTS models with natural prosody, stable speaker characteristics and fast inference.
• Build and experiment with end‑to‑end and LLM‑based speech‑to‑speech translation systems, including streaming and one‑shot approaches.
• Own the full life‑cycle of model delivery: prototyping, ablations, training, evaluation, optimisation and production deployment.
• Work closely with engineering teams to integrate models into real‑time systems, ensuring reliability, uptime and quality at scale.
• Drive improvements in inference efficiency, model serving, voice UX and robustness to real‑world acoustic conditions.
• Establish strong practices for evaluation, reproducibility, monitoring and continuous model improvement in production.
• Mentor researchers and engineers, promote hands‑on collaboration and raise the bar for model quality and operational excellence.

• Deep expertise in speech, audio or multilingual machine learning, particularly in ASR, MT, TTS, end‑to‑end ST or large speech models.
• A hands‑on builder who enjoys training models, running experiments, debugging pipelines and integrating ML systems into production.
• Strong understanding of real‑time streaming constraints and how to design models that operate reliably at low latency.
• Experience shipping ML models to production, maintaining them at scale and working with engineers on deployment, monitoring and serving.
• Ability to lead complex research efforts while staying grounded in product impact, user experience and real‑world performance.
• Strong coding and experimentation skills (Python, PyTorch/JAX, audio processing libraries).
• Ability to communicate clearly, collaborate across teams and align research work with product and engineering priorities.
• Proven experience mentoring others and elevating technical quality across a fast‑moving, applied research team.

We are an equal‑opportunity employer. You are welcome at DeepL for who you are. 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. Bring us your personal experience, your perspectives and your background. Its in our diversity that we will find the power to break down language barriers in the world.

Senior Staff Research Scientist – DeepL Voice – London, England, United Kingdom – Contract – Mid‑Senior level – Research Services.