Founding Software Engineer

Company:  HartleyCo
Location: London
Closing Date: 06/07/2026
Salary: £60,000 - £100,000 per annum
Hours: Full Time
Type: Permanent

Job Description

Founding Software Engineer | Full-Time | London (King's Cross) | £60K - £100K+ + Equity


I'm working with a YC-backed AI start-up hiring for their second Software Engineer, an opportunity for someone who loves to build.


They're building an intelligence platform for consumer brands. Sitting between infrastructure and AI - they're pulling data and turning it into decisions brands can act on immediately.


The founding team has serious pedigree. Previously built and exited companies, worked at top-tier financial institutions, and have been in the trenches of AI product development since before it was fashionable. They're technical, close to their customers, and want an engineer who

operates the same way.


What you'll be doing:


  • Shipping product end-to-end, from prototype to production
  • Spending real time with customers.
  • Helping shape engineering culture and product direction at a critical stage


The tech:


  • TypeScript, Python, SQL
  • LLM orchestration and AI agents in production
  • Large-scale data integrations


What's in it for you:


  • £50,000 to £100,000+ base salary + meaningful equity
  • Visa sponsorship available
  • Transport costs covered
  • King's Cross office (5 days/week)


What they're looking for:


  • 1 to 4 years building things people actually use
  • Genuine LLM/AI experience - building with it, not just calling APIs
  • Full-stack fundamentals in TypeScript and Python
  • Curiosity over credentials - they care how you think, not where you've been
  • A builder with a founder mindset who wants to own things end-to-end

Apply Now
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