Founding AI Engineer

kos.ai•San Francisco, CA

4d•Remote

About The Position

Kos is the world's first virtual finance employee for America’s industrial revival, processing invoices for some of the fastest-growing infrastructure and defense companies in America. Backed by $12M from 8VC, XYZ, and MVP with industry-leaders as shareholders, Kos is processing billions of dollars of customer work. The Founding AI Engineer will own the agent loop, model orchestration, and evaluation infrastructure, ensuring the reliability and continuous improvement of these critical systems. The work directly impacts large and fast-growing infrastructure and defense companies.

Requirements

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 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.
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.

Responsibilities

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.