Member of Technical Staff - Platform Engineering

About Halluminate Halluminate is an applied AI and data company building computer-use and tool-use RL gyms to train AI agents on real financial services work — Excel modeling, pitch decks, and everything investment banking, private equity, and hedge funds rely on. We work with frontier labs, graduated from Y Combinator (S25), and raised a seed round to scale the team. The role Base: $200–275k · Equity: 0.15–0.30% · Location: San Francisco, 5 days in office Own platform engineering, develop frontier long-horizon RL environments, and help build our engineering org from the ground up. Responsibilities - Build our RL environment training and inference infrastructure to support customer usage at scale. - Research and develop next-generation RL environments — increasingly realistic, long-horizon, and difficult for frontier models. - Build software that 10–100x's the quality and throughput of RL environment creation. - Innovate on synthetic data pipelines to create realistic problems. - Build platform analytics for environment cost, hours, bottlenecks, and SME management. - Craft domain-specific verifiers (verifiable rewards for decks, Excel modeling, quantitative trading, and beyond). - Establish engineering culture and practices from the ground up. You should have - Familiarity building evaluations, benchmarks, or RL for AI agents. - Startup speed: iterate quick, ask quick, respond quick, make mistakes quick. - Strong product and user ownership; ability to prioritize across a large roadmap. - Client-facing comfort — you'll talk to users, customers, and SMEs. Nice to have - Research background (training models, publishing papers). - Former founders or experience at early-stage startups. What we offer - Healthcare — Fully covered medical, dental, and vision for you. Subsidized for dependents. - Relocation — $10k+ relocation stipend to help you get to San Francisco. - 401(k) — Up to 4% employer match. - Food — Free breakfast, lunch, and dinner while working. - Health — Free gym membership. - Transportation — Free Ubers and Waymo rides to and from the office. - Visa sponsorship — We sponsor visas, including H-1B.