---
title: 'Software Engineer, AI Agents at Foresite Labs'
canonical: 'https://feeny.ai/job/software-engineer-ai-agents-foresite-labs-san-francisco-fa106kh70933'
type: 'job'
last_seen: '2026-09-11'
---

# Software Engineer, AI Agents at Foresite Labs

- **Company:** Foresite Labs
- **Location:** San Francisco, CA
- **Posted:** 2026-05-01
- **Last confirmed live:** 2026-09-11
- **Apply:** https://job-boards.greenhouse.io/foresitelabs/jobs/8533284002

## Job description

## About Foresite Labs

Foresite Labs is a translational R&D team that derives insights from precision measurement and population-scale biology and genetics to address unmet clinical needs. We use human genetics to systematically dissect and understand human disease biology and develop and critically evaluate therapeutic hypotheses. We engage in translational research, transforming basic insights into therapeutic opportunities. Our work supports drug discovery and company formation, and provides the core around which new ideas are realized and incubated. We offer competitive salaries, excellent benefits, a flexible work environment, and the opportunity to learn from top thinkers in various disciplines. Foresite Labs is headquartered in San Francisco.

## The Role

We're hiring a software engineer to help create the data pipelines, machine learning infrastructure, and agentic systems that power our science. On the agentic side, that means writing the code that runs the loop an AI agent operates inside, not one-off prompts — designing how agents plan, call tools, orchestrate sub-agents, keep memory, check their own work, and decide when they're done, then shipping them into production to do real work across our genetics and drug-discovery pipeline. This is "loop engineering": the model writes the prompts; you build and harden the machinery around it.

It's a full-stack, high-ownership role on a small senior team. You'll take systems from a blank repo to production and work shoulder-to-shoulder with ML engineers, computational biologists, and scientists.

## What You’ll Do

- Build agent loops end-to-end — tool/function calling, planning, sub-agent orchestration, memory, and control flow that runs reliably and unsupervised
- Build the eval and observability harness — the tests, metrics, tracing, and guardrails that make agentic systems trustworthy in production
- Turn scientific and operational workflows into agents that take real action across our platform
- Ship full-stack features: React/Tailwind front ends and backend services that put these agents in front of scientists
- Design and launch production-grade systems, services, data pipelines, and machine learning infrastructure from scratch
- Use frontier AI-native development tools (e.g. Claude Code) to move fast
- Uphold engineering standards through code review, testing, and peer mentorship

## What You’ll Bring

- 5+ years of professional software engineering, with greenfield systems you've shipped to production
- Hands-on experience building LLM/agent systems in production — agent loops, tool calling, RAG, and evals (frameworks like LangChain, Pydantic AI, or equivalent)
- Fluency in TypeScript plus a modern backend language (Python, Go, or Java)
- Working knowledge of AWS/GCP/Azure core services and infrastructure-as-code (Terraform, CDK, or Pulumi)
- Comfort in Unix, Docker, and CI/CD pipelines
- Early-stage execution mindset and strong ownership
- Clear communication across technical and non-technical audiences

## Nice to Have

- Experience with LLM eval / observability tooling (e.g. LangSmith) and prompt/loop iteration at scale
- Multi-agent orchestration in production
- Interest in biology, genetics, or human health — no life-sciences background required

## Why Foresite Labs

- Build frontier agentic products that measurably accelerate real drug discovery
- Greenfield work, end-to-end ownership, and architecture decisions without bureaucracy
- A small, senior team working directly across software, ML, and biology
- Competitive base of $200,000–$240,000, meaningful equity, comprehensive healthcare, generous PTO, and hybrid/remote flexibility

Location: San Francisco, CA

Salary range: $200,000 - $240,000

Foresite Labs is an equal opportunity employer. We thrive on diversity and collaboration.

## About Foresite Labs

## Company Overview
- **One-liner**: Foresite Labs is an incubation platform that builds and launches transformational companies at the intersection of artificial intelligence, data science, and the life sciences.
- **Entity Type**: Private (incubation platform funded by Foresite Capital; latest fund $900M raised in 2024)
- **Headquarters**: San Francisco, California, USA (with a second office in Cambridge, Massachusetts, USA)
- **Founded**: 2019
- **Founders**: Vik Bajaj (CEO) is the founding CEO; the company was established by Foresite Capital

## Core Business
- **Primary industry/industries**: Biotechnology, Artificial Intelligence, Drug Discovery, Healthcare Technology
- **Target customers**: Entrepreneurs and scientists building AI-driven life science companies; portfolio companies span B2B (drug development platforms, data analytics) and B2C (therapeutics)
- **Mission or purpose statement**: “Delivering on the promise of artificial intelligence in science and engineering” – accelerating scientific discovery by integrating AI, data science, and advanced analytics.

## Products & Services
Foresite Labs does not sell a single product; it operates as an incubation and company-building platform. Its core offerings include:

- **Incubation Platform**: Provides infrastructure, capital, scientific expertise, and operational support to spin out new companies. Portfolio includes Xaira Therapeutics, Prometheus, Alumis, Candid Therapeutics, and others.
- **Data Ecosystem**: Standardizes and harmonizes data generation and analysis across the portfolio to fuel AI breakthroughs.
- **Capabilities**: AI/ML model development, data science, advanced analytics, clinical development, and company formation.

## Market Standing
- **Valuation/Market Cap**: Not disclosed for Foresite Labs itself. Its portfolio company Prometheus was valued at $41B (2026).
- **Key Metric**: Total funding raised by Foresite Capital (the affiliated investment firm) – $900M sixth fund (2024) and $173M dedicated to Foresite Labs incubated companies (2022).
- **Notable Investors/Partners**: Foresite Capital (lead investor); portfolio includes collaborations with UCB (acquisition of Candid Therapeutics), Jeff Bezos (Prometheus), and others.
- **Growth Signals**: 15 active job postings (up 650% year-over-year); portfolio company Alumis hit positive psoriasis trial results; Xaira Therapeutics released largest Perturb-Seq dataset; headcount of 31 employees with recent hiring surge.

## Competitive Advantages
- **Scientific rigor meets AI**: Combines deep life science expertise (scientists, clinicians) with cutting-edge AI/ML capabilities.
- **Captive capital and ecosystem**: Backed by Foresite Capital’s large funds, providing patient capital and a network of portfolio companies that share data and tools.
- **Data moat**: Proprietary data ecosystem that standardizes and harmonizes multi-omics and clinical data, creating a unique training ground for AI models.
- **Track record**: Successful exits (Candid Therapeutics acquired by UCB) and high-value spinouts (Prometheus at $41B).

## Strategic Focus
- **Current priorities**: Scaling the incubation pipeline, expanding into new therapeutic areas (autoimmune diseases, oncology), and deepening AI capabilities (e.g., virtual cell models).
- **Direction for growth**: Building a self-reinforcing loop where portfolio companies generate data that feeds back into the platform, accelerating future discoveries.

## Why Work Here
- **Culture highlights**: Values include “Truth over progression” (data-driven decisions), “Take good risks” (celebrate informed risk-taking), and “Single accountable person” (clear ownership). Emphasis on collaboration and respect.
- **Remote/hybrid/office policy**: Flexible work environment; headquarters in San Francisco and Boston.
- **Notable perks**: Competitive salaries, excellent benefits, opportunity to learn from top thinkers across multiple disciplines (scientists, engineers, operators). Employees are encouraged to grow even if they eventually move to a portfolio company.
- **Engineering culture**: Hands-on work building AI platforms for drug discovery; roles span bioinformatics, data engineering, machine learning, and automation.
- **Reviews**: 4.2/5 on LinkedIn (8 reviews); compensation rated 4.3, culture 3.8, career 4.1.

## Sources
1. [foresitelabs.com](https://foresitelabs.com/) – Homepage, company description, portfolio
2. [foresitelabs.com/about](https://foresitelabs.com/about/) – Mission, team, founding story
3. [foresitelabs.com/careers](https://foresitelabs.com/careers/) – Careers page, values, benefits
4. [job-boards.greenhouse.io/foresitelabs](http://job-boards.greenhouse.io/foresitelabs) – Current job openings
5. [linkedin.com/company/foresitelabs](https://www.linkedin.com/company/foresitelabs) – LinkedIn profile, employee count, growth, reviews, recent departures
6. [BioSpace](https://www.biospace.com/) – News on Foresite Capital’s $900M fund and $173M fund for incubated companies (referenced in LinkedIn feed)
7. [MobiHealthNews](https://www.mobihealthnews.com/) – Q&A on Project Stargate and AI cancer vaccines (referenced in LinkedIn feed)

## Other roles at Foresite Labs

- [(StealthCo) Scientist: Biology and Cell Pharmacology](https://feeny.ai/job/stealthco-scientist-biology-and-cell-pharmacology-foresite-labs-boston-vmgm4eyp0rp6) — Boston, MA
- [Senior Data Engineer (5+ years)](https://feeny.ai/job/senior-data-engineer-5-years-foresite-labs-san-francisco-73hkbgkj8gd6) — San Francisco, CA
- [Software Engineer, AI Agents](https://feeny.ai/job/software-engineer-ai-agents-cloudflare-remote-jd7ckc26xwpg)
- [Software Engineer, AI Agents](https://feeny.ai/job/software-engineer-ai-agents-blockit-ai-san-francisco-9jgss3nxpdgk) — San Francisco, CA
- [Software Engineer, AI Agents](https://feeny.ai/job/software-engineer-ai-agents-hightouch-north-f2yyzb5a4504) — North, United States