Founding RL Engineer

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San Francisco ABOUT THE ROLE Join an early-stage AI team as a Founding Reinforcement Learning Engineer, building core systems for training and evaluating AI agents. You will own the process from environment design through model training and evaluation, and help shape the team's technical direction. WHAT YOU'LL DO - Design and build reinforcement learning environments, reward functions, and training pipelines. - Train and fine-tune models using methods such as PPO, GRPO, DPO, RLHF, and RLAIF. - Build evaluation frameworks to measure model and agent performance. - Run experiments, analyze…