Founding RL Engineer

Join an early-stage AI company as its first engineering hire, building reinforcement learning environments and AI agents. You will work closely with the co-founders, shape technical direction, and help grow the engineering team., * Build reinforcement learning environments and tasks using voice and enterprise data.

• Develop and deploy AI agents for enterprise customers.
• Partner with the co-founders on technical direction and product roadmaps.
• Lead engineering as the team grows, balancing fast delivery with high-quality work.

Artificial Intelligence (AI) Agents, Reinforcement Learning, Artificial Intelligence (AI), Product Planning, Python Programming/Scripting Language, JAX (Java API for XML), Mobile Applications Development, Amazon Web Services (AWS), GPU (Graphics Processing Unit), Startup, * Typically 3 or more years of experience in reinforcement learning or AI agent development, or 6 to 12 months building RL environments or data as a recent graduate.

• Experience building coding RL environments and shipping AI agents into production, with strong reinforcement learning fundamentals.
• Professional experience with Python and PyTorch or JAX, and hands-on use of AI coding tools such as Claude Code or Cursor.
• Experience training models with policy gradient methods, reward modeling, RLHF, or related approaches.
• Full-stack experience with TypeScript and AWS; experience with mobile development, distributed training, GPU infrastructure, or LLM post-training is a plus.
• Familiarity with environment frameworks such as Gymnasium, Ray RLlib, Isaac, or MuJoCo, and training libraries such as TRL, verl, or OpenRLHF is helpful.
• Strong shipping record in a startup or AI lab environment; a related degree or relevant open-source work or publications is valued.
• Must be authorized to work in the United States without visa sponsorship and willing to relocate to San Francisco for an in-person 5.5-day work week.

Base salary is $125,000 to $200,000 annually. OTE (on-target earnings, base plus variable) is $225,000 to $400,000. Visa sponsorship is not available.