Senior Research Scientist (Language AI)

TL;DR

Senior Research Scientist (Language AI): Designing, implementing, and deploying cutting-edge research in reinforcement learning and post-training for large language models with an accent on aligning models with human intent and enabling general capabilities. Focus on building and deploying state-of-the-art reinforcement learning pipelines at scale and driving innovations into production for hirify.global's post-training stack.

Location: Hybrid in Berlin, Cologne, Hamburg, Munich, or London (office attendance required twice a week)

Company

hirify.global is a global communications platform powered by Language AI, focused on breaking down language barriers with human-sounding translations and intelligent writing suggestions for over 100,000 businesses worldwide.

What you will do

• Design, implement, and deploy cutting-edge research in reinforcement learning and post-training at scale.
• Build and deploy state-of-the-art reinforcement learning pipelines.
• Post-train large (multi-modal) models to align with human intent and enable reasoning capabilities.
• Manage the entire research and production lifecycle from idea conception to production deployment.
• Foster external collaborations with academic and industrial partners.
• Collaborate with Engineering, ML Platform, and HPC teams to deliver robust model updates.

Requirements

• Deep technical background, strong leadership skills, and a proven track record in reinforcement learning or large-scale model alignment to production.
• Strong practical background, creative mindset, and passion for solving hard problems with real-world impact.
• Solid mathematical background (Master's, PhD, or equivalent industry experience in mathematics, physics, computer science, or related field).
• Deep practical experience in Python and at least one modern machine learning framework (PyTorch, TensorFlow, or JAX).
• Track record of leading self-directed research projects that deliver tangible results.
• Hybrid work schedule, with team members coming into the office twice a week in Berlin, Cologne, Hamburg, Munich, or London.

Nice to have

• Experience working with large compute clusters and ML infrastructure.
• Expertise in deep reinforcement learning (RLHF/RLAIF/RLVR).
• Hands-on experience scaling and deploying LLMs or other foundation models in real-world systems.

Culture & Benefits

• Diverse and internationally distributed team (90+ nationalities).
• Open communication, regular feedback, and a culture valuing empathy and growth mindset.
• Flexible working hours and trust in productivity.
• Monthly full-day hacking sessions ("Hack Fridays").
• 30 days of annual leave and access to mental health resources.
• Competitive, location-tailored benefits package.
• Virtual Shares, linking employee contribution to hirify.global’s growth.