Full Stack Engineer (Los Altos)

• 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 global 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.

• About the Role

We're looking for a Full Stack Engineer, Applied AI to help build Cheiron's core product and infrastructure.

This role spans the full stack — backend systems, AI workflows, RAG and search pipelines, APIs, and the customer-facing product itself. You won't own just one slice; you'll work deeply across the product and systems and solve whatever problems need solving.

We build products that run in real customer environments — not research demos or prototypes. We're looking for a hands-on builder who can quickly structure ambiguous problems and turn them into highly polished products. You don't need to be an AI researcher or a life sciences domain expert, but we care deeply about strong engineering fundamentals and real experience designing, building, and operating LLM systems.

• What You'll Do

• Design and build backend services on Python, FastAPI, and Postgres

• Build applied AI workflows using the OpenAI API, LangGraph, vector DBs, and search systems

• Develop ingestion, indexing, and search pipelines for life sciences data, including academic papers, clinical, regulatory, safety, and patent sources

• Build customer-facing features end to end, from the data model to the API to the React/TypeScript frontend

• 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

• Work directly with founders, domain experts, and early customers, owning outcomes rather than just closing tickets

• Requirements

• 2+ years of experience shipping production software end to end

• Strong backend engineering fundamentals and experience designing APIs, databases, and services

• Hands-on production experience with AI-driven systems such as LLMs, agents, RAG, and vector DBs

• Full-stack range, comfortable working through the frontend with React and TypeScript

• The drive to set your own priorities and ship quickly, even when specs are incomplete

• Active use of AI coding tools such as Claude Code and Cursor

• Nice to Have

• Hands-on experience designing and operating LangGraph, agent frameworks, or RAG systems in production

• Experience with vector DBs, semantic search, and knowledge graphs

• Experience building enterprise SaaS, or pharma, biotech, or healthcare products

• Familiarity with life sciences domain data such as academic literature, clinical trials, regulatory documents, and patents

• Experience at a seed or early-stage startup

• Benefits & Perks

• 401(K) retirement plan

• Health insurances (Medical/Dental/Vision)

• Meal allowance (Lunch, Dinner)

• Transportation support for early starts and late nights

• In-office snack bar and additional commuting and work travel support

• Interview Process

Screening ＞ Take-home Assignment ＞ Technical Interview ＞ Cultural Interview