Senior Software Engineer

Skills

Job Specifications

Senior Software Engineer | YC-Backed Startup | Founding Team | £90K-£120K + Equity

I'm working with an exciting YC-backed startup in London that's just closed a multi-million pound funding round and is looking for a Senior Software Engineer to join their founding engineering team.

Despite being early-stage, they're already punching well above their weight – with paying customers onboarded and serious traction in their market. This is a rare opportunity to get in at the ground floor of something special.

What you'll be doing:

Working directly alongside the founders to build and scale the product
Taking real ownership over technical decisions and architecture
Shaping the engineering culture and technical direction from day one
Building features that directly impact paying customers

The tech:

Python
TypeScript
React/Next.js

What's in it for you:

£90,000 - £120,000 base salary + Equity
3 days per week in their London office (hybrid working)
Direct impact on product and company direction
Work with world-class founders backed by Y Combinator

What they're looking for:

Strong commercial experience with Python and TypeScript
Experience with React/Next.js or similar modern frontend frameworks
Someone who thrives in fast-paced, early-stage environments
A builder who wants ownership, not just tickets to complete

If you're a senior engineer looking to step into a founding team role at a startup with genuine momentum, let's talk.

About the Company

Founded in 2019, HartleyCo is a boutique Recruitment Firm who solely focus on placing highly skilled technology professionals, into Permanent & Contractor opportunities across Hampshire, Surrey, Berkshire and London. Simply put, HartleyCo are trusted advisors who provide great recruitment experiences. We're not trying to reinvent the wheel. We listen, advise then action. What you'll find partnering with HartleyCo, will be a series of enjoyable experiences coupled with human conversation & delivery. If you'd like to explo... Know more

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