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Member of technical staff - Research - Model

France; United Kingdom, Paris · Job Posted February 21, 2026
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Job Description

H exists to push the boundaries of superintelligence with agentic AI. By automating complex, multi-step tasks typically performed by humans, AI agents will help unlock full human potential. The Models team builds the foundational models that power our cutting-edge agentic technology. We focus on training techniques to optimize model capabilities specifically for agent applications. This allows us to achieve the best performance at a given inference cost. Our work spans the development of Large Language Models (LLMs) and Vision-Language Models (VLMs), enabling agents to perceive, understand, and act within complex environments. We are deeply involved in enhancing these models through training methods with a focus on improved instruction following, tool use, and interaction with dynamic environments via large-scale reinforcement learning and reward modeling. We operate at the intersection of research and product, translating cutting-edge research into practical solutions that drive the next generation of AI.

Job Responsibility

  • Develop and train advanced LLMs and VLMs, including multimodal architectures
  • Research and implement training methods for enhanced capabilities like instruction following and tool use
  • Design and optimize data pipelines and training systems for large-scale distributed training
  • Collaborate with cross-functional teams to integrate models into agentic AI systems
  • Evaluate model performance and communicate findings to stakeholders
  • Stay current with advancements in LLMs, VLMs, and related fields

Requirements

  • Strong programming skills (Python, Git)
  • Expertise in deep learning frameworks (PyTorch, JAX, TensorFlow)
  • Experience with large-scale distributed training of LLMs and VLMs
  • Hands-on experience with LLM training, alignment, and reinforcement learning
  • Knowledge of multimodal architectures and applications
  • Publications in top-tier AI conferences (e.g., NeurIPS, ICML, CVPR, ACL, ICCV)
  • Advanced degree (PhD or MSc) in a relevant field (e.g., ML, DL, NLP, CV)
  • Excellent communication and presentation skills
  • Strong collaboration and teamwork skills
  • Passion for AI and problem-solving

Nice to have

  • Industry experience
  • Experience in LLM training with RL
  • Experience with data processing techniques

What we offer

  • Join the exciting journey of shaping the future of AI, and be part of the early days of one of the hottest AI startups
  • Collaborate with a fun, dynamic and multicultural team, working alongside world-class AI talent in a highly collaborative environment
  • Enjoy a competitive salary
  • Unlock opportunities for professional growth, continuous learning, and career development

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