Founding Engineer (£100k-£150k + Equity) at Xylo

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Job Title

Founding Engineer

Salary

£100k-£150k + Equity

Company Description

Xylo is a London-based startup modernizing government software with AI to replace legacy systems. Founded by experienced leads from Marshmallow, Cytora, and successful construction-tech founders, they are tackling the trillion-dollar global planning crisis to accelerate housing, energy, and infrastructure projects across the UK and US markets.

Job Description

As the first individual contributor engineer at Xylo, you will work alongside veteran founders to architect and build AI-powered solutions that automate complex government workflows. You'll ship end-to-end features using a modern stack including React and AI agents, directly impacting how critical infrastructure projects are approved and delivered across the globe.

Location

London, UK

Why this role is remarkable

• Join as the first IC hire with significant autonomy to shape the technical architecture and product direction of a generational company.
• Work on a trillion-dollar problem where your code directly reduces years of bureaucratic backlogs in housing and green energy infrastructure.
• Collaborate with a high-pedigree founding team including a 2x founder and former engineering leads from scale-ups like Marshmallow and Cytora.
  
  

What You Will Do

• Build and deploy end-to-end features and AI agents that autonomously gather evidence and cross-reference thousands of planning data sources.
• Collaborate directly with government users to translate complex regulatory requirements into intuitive, durable workflows and human-in-the-loop interfaces.
• Influence every aspect of the engineering culture, from selecting tools to establishing high-velocity shipping standards using AI-assisted development.
  
  

The ideal candidate

• You have 3+ years of experience as a full-stack engineer shipping production-grade products, ideally within a fast-paced startup environment.
• You are an expert in React and TypeScript and are comfortable working with tools like Supabase, AWS, and AI orchestration frameworks.
• You possess a founder mindset and a deep curiosity for solving user problems, particularly those involving complex LLM-driven agents and workflows.
  
  

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.