HartleyCo
Founding Software Engineer
Requirements
The ideal candidate should have 1 to 4 years of experience building usable products and genuine LLM/AI experience. Full-stack fundamentals in TypeScript and Python are required, along with a builder mindset and curiosity over credentials.
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
Skills
About HartleyCo
Founded in 2019, HartleyCo is a boutique Technology and Finance Search Firm. Across the UK, US and Central Europe, we deliver Permanent and Interim Recruitment Solutions, Consulting Services and Executive Search. Our expert teams focus on: Technology • Generative AI and LLM • Software Engineering • GTM People • C Suite inc Chief of Staff & CTO • Co-founder Our clients include a diverse range of businesses, from innovative start-ups at the very beginning of their journey, to some of the world’s largest corporations. With a dedicated focus on the VC & Private Equity markets, we have a deep understanding of the unique dynamics involved in working with VC/PE firms and scaling their Portco's. Simply put, HartleyCo are trusted advisors who provide fantastic recruitment experiences. We’re not trying to reinvent the wheel. We listen, advise then action.