> Markdown version of [/jobs/ext/3117191-founding-engineer](https://www.wearedevelopers.com/jobs/ext/3117191-founding-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Founding Engineer

- **Company:** Ai
- **Location:** London, UK
- **Experience:** Experienced
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Web Scraping, Python (Programming Language), Large Language Models, Low Latency, Cloudflare
- **Published:** September 28, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/founding-engineer/48829776

## About the Role

rules at low latency and high accuracy, at scale.Shaping technical decisions that will define the company's architecture for years.What We're Looking ForYou have 3+ years of experience and are able to perfectly balance speed vs. quality when shippingYou enjoy taking end-to-end ownership of a problem which is not perfectly defined.You ship for the user!You have strong technical skills, ideally backend.What We OfferLondon, in-office 5-days a week (with some flexibility)Lunches at the office: Wild Wednesday's (pitch crazy ideas), Friday lunch & learn (can be any topic)Dinner covered if staying lateBudget for anything that will make your life easier or more efficient/pleasant.The chance to shape the technical foundation of a company building core infrastructure for a $200B+ marketWe also offer a $10k referral bonus (after the referred hire finishes a 3 month probation period). Penelope Health is an equal opportunity employer. We consider all qualified applicants without regard to race,
color, religion, national origin, sex, sexual orientation, gender identity, age, disability, veteran status, or any other characteristic protected by law. #J-18808-Ljbffr

## Description

existing investors Bertelsmann Healthcare Investments, Twine Ventures, and Seedcamp.Ten months ago this company was two people and a question: will my insurance cover this procedure? Now we are hiring across New York and London to become the intelligence platform both sides of American healthcare build upon.Our angels include Dane Knecht (Cloudflare CTO), Lord Ara Darzi, and the Head of Microsoft AI Health. Tech stack: Python, Railway, AWS, Prefect, LakeFS, LLMs with Pydantic AI and evals.What You'll Work OnYou'd be a founding engineer on our team. The things you'll work on include:Designing the ingestion engine that tracks constantly-updating coverage policies across thousands of payers - combining web scraping, LLM-powered extraction, and structured validation.Building the representation layer that converts medical necessity criteria into computable contracts (think: formal logic, CQL, deterministic evaluation).Architecting the API and MCP endpoints that let AI agents query coverage