Founding Product Engineer (Python)

Entrepreneur First; Greater London; On-site; GBP 75,000 - 95,000; Full time

Job summary

A healthcare technology startup in London is seeking a Founding Product Engineer with strong backend skills in Python to help define and build its clinical platform, DoctorOS. The role involves ownership of backend systems, working closely with frontend teams, and developing reliable and high-quality products for the healthcare sector. This position offers a competitive salary and equity options, along with benefits such as private health coverage.

Benefits

Private health insurance

Dental coverage

All equipment covered

Qualifications

• Strong backend experience with Python in production.
• Experience designing and owning APIs and backend services.
• Solid understanding of data modeling, async systems, and reliability.

Responsibilities

• Define and build DoctorOS from the ground up.
• Work primarily across backend services and data infrastructure.
• Collaborate closely with frontend engineers to ship features.

Skills

Backend experience with Python

API ownership and design

Data modeling

Collaborative mindset

Tools

AWS

React

Tailwind

Job description

Founding Product Engineer (Python)

Join Asterix as our Founding Product Engineer. Build frontier clinical products, own the stack, and help create DoctorOS – the platform powering the future of healthcare.

At a glance

• Compensation: £75k-95k+ with generous equity
• Location: Onsite in Shoreditch, London
• Benefits: Private health + dental by Bupa, all equipment covered

About Asterix

We are solving the biggest problem in healthcare: there are not enough doctors, and the system can no longer keep up. Millions of patients wait weeks for appointments… Asterix is building the only scalable solution. A new model of care where highly‑qualified doctors are augmented by AI, safely, consistently, and measurably. The DoctorOS, our emerging clinical platform, is becoming the backbone of modern healthcare delivery.

Your Mission

As a Founding Product Engineer, you will help define and build DoctorOS from the ground up. This is a backend‑first, product‑focused engineering role. You’ll obsess over system correctness, performance, reliability, and real‑world clinical workflows. You’ll work primarily across backend services, data infrastructure, and platform systems while collaborating closely with frontend engineers to ship features doctors use every day.

Tech Stack

• Python (production backend services)
• AWS serverless: Lambda, API Gateway, DynamoDB, and S3
• Event‑driven and async systems
• Secure data handling and API design
• Supabase (Auth + Postgres where appropriate)
• React 19 with TypeScript (frontend collaboration)
• Playwright for testing
• Tailwind for styling
• Radix UI for components

You will own

• Backend systems for DoctorOS: APIs, services, data models, and infrastructure powering clinician‑facing workflows.
• AI platform infrastructure: inference pipelines, retrieval systems, fine‑tuning hooks, evaluations, safety mitigations, and monitoring.
• Clinical‑grade safety infrastructure: hallucination detection, error monitoring, model governance, incident tooling, and system‑level guardrails.
• Human‑in‑the‑loop clinical validation: working directly with doctors and our clinical leads to define acceptance criteria and run prospective evaluations.
• End‑to‑end shipping: design → implement → deploy → monitor → iterate.
• Future team growth: help hire the next engineers and shape the technical culture from the ground up.

Who You Are

• Strong backend experience with Python in production.
• Experience designing and owning APIs and backend services.
• Solid understanding of data modeling, async systems, and reliability.
• Product instincts and good judgment around performance and safety.
• Comfort collaborating across frontend, product, and clinical teams.

Nice to have (not required)

• Experience working with AI‑powered features or LLM APIs.
• Familiarity with regulated or high‑trust environments.
• Startup or founding‑team experience.
• Some frontend experience (React/TypeScript).

Culture – The Asterix Way

Humble – We assume we’re wrong until data or a clinician proves otherwise. We default to curiosity, ask questions, and help each other level up.

High‑intensity – Founder mentality – No corporate wannabe’s – You don’t wait for permission. Act like an owner of the mission, the codebase, the infrastructure, and the culture.

Joyful energy – Work seriously but not ourselves. Laugh, celebrate wins, and show up with energy, optimism, and kindness.

In‑person by design – We work shoulder‑to‑shoulder in London, making the journey faster, tighter, and more fun.

What Success Looks Like

Months 1‑3: Learn, Ship, Embed

• Ship production backend features used by clinicians.
>Learn clinical workflows and real user needs deeply.
• Take ownership of core services and APIs.

Months 3‑6: Lead, Architect, Level up

• Own major backend systems end‑to‑end.
• Make architectural decisions shaping DoctorOS.
• Improve performance, reliability, and system observability.
• Help interview and onboard new engineers.

Months 6‑12: Own Systems, Shape the Company

• Own multi‑quarter platform initiatives.
• Mentor new hires and shape engineering culture.
• Build foundational systems at scale.
• Represent Asterix in technical conversations with partners.

Result: Promotion to Senior / Lead Engineer + meaningful equity top‑up.

Why Join Now

• Redefine how high‑quality healthcare is delivered to patients.
• Build products that must be safe, measurable, and trusted.
• Learn faster than anywhere else.
• Have outsized impact and ownership.
• Earn meaningful equity while shaping the team from day 0.

Already working at Asterix Health?

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