Senior Staff Research Scientist leading AI research and development at DeepL, shaping the future of model training while collaborating with cross-functional teams in an innovative environment.
Responsibilities
Shape scientific strategy and vision for post-training across DeepL, identifying high-leverage directions, setting technical standards and leading research initiatives in a highly dynamic, fast-paced environment
Build and deploy state-of-the-art reinforcement learning pipelines at scale
Post-train large (multi-modal) models to align them with human intent and enable general capabilities such as reasoning, pushing the boundaries of model performance, safety, and efficiency
Drive the entire lifecycle of research and production: from idea conception, theoretical modeling, prototyping, ablation studies, all the way to production deployment
Work closely with cross-functional leadership to shape the technical strategy and priorities of the foundational models research track
Build and foster external collaborations with academic and industrial partners
Set scientific and technical standards for experimentation, reproducibility, and model evaluation
Collaborate deeply with Engineering, ML Platform, and HPC teams to deliver robust and reliable model updates to users
Mentor and guide senior scientists, researchers, and engineers, fostering a culture of excellence, curiosity, and impact
Requirements
PhD (or equivalent experience) in Computer Science, Machine Learning, Applied Mathematics, Physics or a related field
5+ years of experience in ML research, including several years leading high-impact projects with responsibilities extending across different teams
Strong expertise in deep reinforcement learning (RLHF/RLAIF/RLVR)
Hands-on experience scaling and deploying LLMs or other foundation models in real-world systems
Strong programming skills and experience working with large compute clusters and ML infrastructure
Excellent communication skills — able to clearly explain complex topics to diverse audiences
Track record of mentoring other scientists and setting technical long-term vision.
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