Founding Software Engineer (£100k + Equity) at Stratum in London

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 Software Engineer
• Salary
• £100k + Equity
• Company Description

Stratum is a London-based AI startup founded by researchers from the UK AI Security Institute and Arup.

They are building an agentic platform to automate civil engineering assessments, having already secured £400k in pilot revenue and partnerships with 10% of UK local councils to transform infrastructure delivery.

Job Description

Join Stratum as a Founding Engineer to architect production-grade agentic AI systems for civil engineering.

You will build the backbone of platforms that condense weeks of manual technical assessments into hours.

Working directly with the CTO, you'll own backend architecture and AI integration, driving rapid deployment cycles for a fast-growing customer base.

• Location
• London, UK
• Why this role is remarkable
• True founding-level ownership with significant equity and a direct line into product strategy and engineering culture.
• Impressive traction including £400k pilot revenue in seven months and adoption by 10% of all UK local councils.
• Work at the frontier of AI for the physical world, solving high-stakes problems in climate resilience and infrastructure.

What You Will Do

• Architect and build robust, production-ready backend systems using Python and GCP (Cloud Run, Pub/Sub, Postgres) to power agentic workflows.
• Design and implement full-stack features in React, translating complex engineering requirements into intuitive, AI-native workspaces for technical experts.
• Lead the development of agentic architectures, evaluating and implementing cutting-edge LLM techniques like RAG and MCP for regulatory-grade precision.
• The ideal candidate
• 4+ years of experience operating production backend systems, with deep expertise in Python, GCP, and Infrastructure as Code using Terraform.
• Proven track record of shipping agentic AI systems where model evaluation, prompt design, and orchestration were central engineering challenges.
• Possesses Founding Engineer DNA—a pragmatic, autonomous builder who thrives in ambiguity and has experience scaling products from zero to one.

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.

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.
• 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.

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