Title: Founding AI Engineer Location: San Francisco Department: Engineering Job Description: About kos.ai Trillions of dollars are flowing into datacenters, defense, energy, and manufacturing. The finance teams processing that capital can't keep up. 800-page invoices, thousand-page contracts, landing every few weeks, often on weekends. The world can't hire specialized accountants fast enough. Media: The Information covering our launch The Role You'll own the agent loop, the model orchestration, and the eval infrastructure. Kos is processing billions of dollars of customer work. Your systems are what keep that right. You'll own how that system gets built and how it gets better. Your work lands in production at some of the largest and fastest-growing infrastructure and defense companies in America. What you'll do: - Own the agent runtime: computer use, tool orchestration, and memory loop that lets Kos learn a workflow from customer demos - Design the ensemble routing layer that picks the right model per step and keeps Kos.ai provider-agnostic - Build the evaluation harness that catches regressions on recorded customer workflows before they reach production - Take frontier agent capabilities from paper to production, with equal attention to what the research says and what runs reliably every day - Partner with the applied controller team so practitioner-caught errors turn into prompt, model, and routing improvements - Set the hiring bar and culture for Kos.ai You - Have strong fundamentals: Bachelors / Masters / PhD in CS/EE from top-tier universities, 2+ years of experience - Have shipped an agentic system, computer-use agent, or LLM-powered feature into production. Or you have an equivalent research track record. - Worked on modern LLM orchestration, tool use, eval design for open-ended tasks, and the tradeoffs between fine-tuning, prompting, and retrieval are second nature to you - Can take a problem from "interesting paper" to "runs reliably every day for paying customers" without being told how to scope it - Track agent and LLM research closely. Useful ideas turn into production experiments in your hands quickly. - Care as much about the eval harness as the model weights. Benefits - Medical, dental, vision for you and your dependents (little/no premiums, the absolute best we qualify for) - 401(k) - Visa sponsorship Team Tanuj and Mani met at Stanford as graduate researchers under Sachin Katti. Tanuj spent his career in and around the operators Kos serves: IT, datacenters, industrials, and hardware. He previously founded Spot AI, a computer vision company which scaled to over 1,000 enterprise customers. Mani's an International Olympiad medalist, earned his Engineering PhD at Stanford, & published leading research at Microsoft Research. He then built product within Microsoft Azure's Strategic Missions and Technologies group. We built Kos because the finance and operations teams behind America's re-industrialization are talented, overwhelmed, and can't hire their way out. Every CFO we spoke to described the same problem: 800-page pay apps, thousand-page contracts, work piling up on weekends, and a talent pool for inventory, utilities, capex, and construction accounting that's simply too small to meet the moment. The back office of the buildout is the bottleneck, and it's the one nobody's building for. They deserve a partner that can keep pace with their ambition.