Software Engineer (Full‑Stack / Infrastructure) — Frontier AI Evaluation

About The Team We build the data, evaluation, and experimentation infrastructure powering next‑generation agentic AI systems . Our work directly supports all five leading AI labs and focuses on the hardest problems in LLM reasoning, RL environments, and human‑in‑the‑loop workflows. We're a fast‑moving, talent‑dense team with backgrounds in quant finance, top‑tier startups, and elite engineering orgs . Revenue is already in the 8‑figure range with a steep growth curve and a major Series A on the way. The Role This is a broad, high‑ownership engineering role — not a narrow feature lane. You'll work across research, infra, product, and data, owning systems end‑to‑end. Expect to touch everything from RL environments to distributed infra to full‑stack dashboards. A typical month might include: Prototyping a new RL environment from a research paper Deploying distributed experiments on Kubernetes Improving reliability of Next.js dashboards Building a Kafka pipeline for annotator analytics You'll shape core systems used by frontier AI labs from day one. What You'll Do Build scalable systems: RL environments, APIs, human‑in‑the‑loop platforms Collaborate with research, product, and design to ship quickly Write clean, maintainable code with strong documentation Participate in architecture discussions and code reviews Solve real‑world scalability and reliability challenges Contribute to the infrastructure powering frontier AI evaluation Who We're Looking For We're looking for early‑career engineers who have already shown they can thrive in fast‑moving, high‑ownership environments and want to work on some of the most challenging problems in AI. Experience 1–3 years as a full‑stack software engineer Background at a high‑growth startup, top quantitative trading firm, or experience as a founding engineer at a company with meaningful early traction If your experience is primarily big tech, we look for a strong CS foundation (e.g., top‑tier CS programs such as Berkeley, CMU, MIT, Stanford) Bonus Experience Time spent at companies focused on human‑in‑the‑loop AI, data labeling, or AI evaluation (e.g., Surge AI, Snorkel, Scale, Labelbox, Micro1, Mercor) Exposure to fast‑paced environments where you shipped features end‑to‑end and owned outcomes What Matters Most You've built real systems — not just maintained them You take ownership, move quickly, and enjoy solving hard technical problems You're comfortable working directly with researchers, product teams, and customers You thrive in environments where the roadmap changes based on what you learn Technical Skills Full‑stack: Next.js / React, Node.js / Python Infra: Kubernetes, Kafka, Redis, Elasticsearch Ability to build end‑to‑end systems with high ownership Soft Skills Strong ownership and bias toward shipping Comfortable being client‑facing with AI lab researchers Thrives in fast‑paced, high‑iteration environments Work Environment 5 days/week onsite in Financial District Flexible hours Optional half‑day or remote on Sundays Tight‑knit, high‑trust, high‑velocity team Why Join Work directly with frontier AI labs Solve the hardest problems in AI evaluation Massive ownership and impact from day one Build at a scale most AI startups never reach Join a team of elite engineers and operators Show more Show less