Company Overview
Cheiron is a Stanford-founded AI company building an AI-native operating system for the pharma, biotech, and broader life sciences industry.
Since launching in 2024, we've rapidly grown our general user base. In Korea, we reached 22% of industry users within six months and are now used across 200+ pharma and biotech companies as we continue to scale quickly.
We’re looking for a Backend Engineer, Applied Agents to help build Cheiron's agent layer and the backend systems that power it.
Cheiron's agents don't just generate answers. You'll design and ship the agent runtime, harness, memory, and tool execution layers that make all of this possible.
We're looking for a hands‑on builder who can quickly structure ambiguous problems and turn them into highly polished products. Design, build, and operate Cheiron's agent layer: agent runtime/harness, tool‑calling infrastructure, sandboxed code execution, agent memory, and the reliability and observability of multi‑step tasks
Design and build backend services and APIs on Python, FastAPI, and Postgres




Design and operate vector DB, semantic search, and RAG systems, and tune search quality and latency
Build large‑scale ingestion, cleaning, and indexing pipelines for life sciences data, including academic papers, clinical, regulatory, safety, and patent sources
Build systems that ground AI‑generated outputs in source data with traceable, verifiable citations so they can be trusted in real pharma and biotech work
2+ years of experience shipping and operating production backend systems end to end
~ Strong backend engineering fundamentals: a deep understanding of API design, data modeling, databases, and system reliability
~ Practical understanding of how agent systems actually work: you've built — or at least deeply traced — agent runtimes, harnesses, tool calling, sandboxing, and memory
~ Active use of AI coding tools such as Claude Code and Cursor

Hands‑on experience designing and operating LangGraph, agent framewo

📌 Backend Engineer, Applied Agents (Los Altos)
🏢 Cheiron
📍 Los Altos