Founding Product Platform Engineer (+ Equity) at well-funded AI decision startup
Jack & Jill · London, England, United Kingdom
Platform Engineering
About this role
As a founding team member, you will design and build the core product platform for an AI decision startup. The role involves bridging the gap between AI workflows and scalable B2B software by owning engineering craft across backend APIs, frontend interfaces, and data-heavy systems. You will design infrastructure for storing, querying, and auditing AI-generated insights and model traces. The technical environment involves working with Python (FastAPI) and React/TypeScript (Next.js) to transform prototype AI workflows into robust software primitives. You will collaborate directly with founders to shape the core architecture and product culture of the venture-backed startup.
Skills & technologies
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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
Founding Product Platform Engineer
Salary
Not Disclosed + Equity
Company Description
Well-funded AI decision startup
Job Description
Join a founding team building an auditable AI decision platform. You will design the product infrastructure that makes complex reasoning, evidence, and uncertainty visible to customers. This role bridges the gap between raw AI workflows and scalable B2B software, owning the engineering craft across backend APIs, frontend interfaces, and data-heavy systems.
Location
London, UK
Why this role is remarkable
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.
How does this work?
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.
She will pick the best candidates from Jack's network.
The next step is to speak to Jack.
Job Title
Founding Product Platform Engineer
Salary
Not Disclosed + Equity
Company Description
Well-funded AI decision startup
Job Description
Join a founding team building an auditable AI decision platform. You will design the product infrastructure that makes complex reasoning, evidence, and uncertainty visible to customers. This role bridges the gap between raw AI workflows and scalable B2B software, owning the engineering craft across backend APIs, frontend interfaces, and data-heavy systems.
Location
London, UK
Why this role is remarkable
- Shape the core architecture and product culture of a venture-backed startup at the founding stage.
- Solve unique technical challenges in making non-deterministic AI outputs auditable, traceable, and trustworthy for high-stakes business decisions.
- Direct ownership over the platform layer that bridges cutting-edge AI research with reliable, user-centric software products.
- Build the core product platform including customer-facing interfaces, backend APIs, and reusable data workflow systems.
- Design and implement infrastructure for storing, querying, and auditing AI-generated insights, source evidence, and model traces.
- Collaborate with founders to transform prototype AI workflows into robust, repeatable software primitives that ensure customer trust.
- 5+ years of software engineering experience with strong proficiency in Python (FastAPI) and React/TypeScript (Next.js).
- Proven track record of building data-intensive B2B SaaS platforms or complex workflow tools from the ground up.
- Exceptional product judgment with a focus on creating clear, reliable, and observable systems in ambiguous environments.
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.
How does this work?
- Jack's an AI agent for job searching and career coaching. He works for you.
- Jill is the AI recruiter working for the company. She recruits from Jack's network.
- If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.
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.
Ready to apply?Apply now
