Senior Software Engineer, AI
Company: Lassie
Location: San Francisco
Posted on: April 2, 2026
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Job Description:
Lassie is building the AI for every health practice. One million
health practices spend $100B a year on admin staff, and still can't
find enough people. Since COVID, offices are chronically
short-staffed. Patients feel it every day in unanswered calls and
confusing bills. We believe the doctor's office of the future is
run by AI. An agent that runs the business, handles the
administration, and becomes the interface patients use to interact
with their doctor's office. Founded by Steijn Pelle (helped
Robinhood and Coinbase grow to their first hundreds of millions in
annual revenue) and Frédéric Renken (engineer turned first product
hire at Superhuman), we're bringing consumer product DNA to
healthcare and reimagining how a million doctors and 300 million
patients interact with the doctor's office. About the role We're
hiring an engineer to build the AI agents that run doctor's
offices. These are production systems handling real money and real
patient data for thousands of practices. You'll work across the
full stack: agent architectures, data pipelines, evals, and the
infrastructure that makes it all reliable. You will be a great fit
if you… Are excited to work with frontier models Engineer for
reliability and correctness, not just functionality Diagnose and
resolve live production incidents with minimal disruption Automate
away repetitive work and build tooling that makes engineering
faster and safer Design schemas and pipelines for large-scale
datasets to power applied AI Are comfortable working across
databases, caches, proxies, and job orchestration systems Some
things we've built Data pipelines processing $1B in insurance
claims Systems that eliminate thousands of hours of paperwork every
month A sync engine backed by encrypted SQLite in the browser,
enabling 100ms experiences for healthcare payments and patient
ledgers Technology we use We invest heavily in productivity.
Engineers should have the best tools for the job and the freedom to
choose them. Python (Django, Pydantic AI), Postgres, Redis
TypeScript, React, Tailwind Google Cloud Platform, Vercel Linear,
Slack, Notion Joining us To start, you'll have a handful of
conversations with our founders and team. If there is mutual
excitement, we'll invite you for an in-office work trial where
you'll collaborate on real problems we're solving and meet the
team.
Keywords: Lassie, Milpitas , Senior Software Engineer, AI, IT / Software / Systems , San Francisco, California
