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Jack & Jill

Backend Engineer (£100k-£140k + Equity) at well-funded healthcare infrastructure startup

Jack & Jill
United Kingdom · Full-time · Not Applicable

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers.

She will pick the best candidates from Jack's network.

The next step is to speak to Jack.

Job Title

Backend Engineer

Salary

£100k-£140k + Equity

Company Description

Well-funded healthcare infrastructure startup

Job Description

As the first engineering hire, you will build the infrastructure to make healthcare billing deterministic. You'll scale an ingestion engine tracking thousands of payer policies, converting complex medical necessity criteria into computable contracts. This role involves architecting low-latency APIs and utilizing LLMs to eliminate the adversarial back-and-forth in the insurance system.

Location

London, UK

Why this role is remarkable

  • Join as the first engineering hire with significant founding-team equity and direct influence on the technical foundation.
  • Work alongside a high-caliber founding team of physicians and expert data scientists backed by top-tier VCs.
  • Solve genuine technical complexity in a $200B market, building systems that materially reduce healthcare costs for patients.

What You Will Do

  • Design a high-throughput ingestion engine combining web scraping and LLM-powered extraction to track thousands of payer policies.
  • Architect a representation layer that converts medical necessity criteria into formal logic and computable contracts.
  • Build and maintain production-grade API and MCP endpoints for AI agents to query coverage rules with high accuracy.

The ideal candidate

  • Deep experience in backend engineering with a focus on web scraping at scale and high-throughput data systems.
  • Proven expertise in LLM-powered structured extraction, including rigorous evaluation frameworks and pydantic-based validation.
  • Strong engineering taste and velocity, with the ability to manage complexity and make trade-offs in a fast-paced environment.

Who are Jack & Jill?

Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.

And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.

Next steps

Step 1. Visit the job listing.

Step 2. Click 'Talk to Jack', or go straight there: https://www.jackandjill.ai/jobs/backend-engineer-100k-140k-equity-at-well-funded-healthcare-infrastructure-start-04c5a936-8d57-4e0c-943c-ec5c04d1b468?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_04c5a936-8d57-4e0c-943c-ec5c04d1b468

Step 3. Talk to Jack so he can understand your experience and ambitions.

Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.

Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction.

Step 6. If not, Jack will find you excellent alternatives. All for free.

We never post fake jobs

This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.

Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.

We appreciate this can make them look a bit suspect, but there isn't much we can do about it.

Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.

Key Skills

Ranked by relevance

ai
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Posted
May 08, 2026
Type
Full-time
Level
Not Applicable
Location
London

Industries

Technology Information Internet

Categories

Engineering Information Technology

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