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Founding Software Engineer

StackfixLondon, Holborn🇬🇧United KingdomPosted 11 Sept 2026

Why This Role Stands Out

As a Founding Software Engineer at Stackfix, you'll have the unique opportunity to build and own cutting-edge AI systems from the ground up, shaping the future of their technology and impacting PE-backed companies. This senior role, offering a competitive salary of GBP 100,000 - 120,000 plus equity, is ideal for experienced engineers eager to make a significant impact in a dynamic, on-site environment. If you're passionate about AI and ready to take on a foundational role, this is an exciting chance to grow your career.

Quick Overview

Salary
£100k - £120k/yr
Seniority
Senior
Employment type
Full Time
Work mode
On Site
Location
London, Holborn, United Kingdom
Posted
1 hour ago

Job Description

Build and own production AI systems for PE-backed companies end-to-end. The default stack is Python, Django, HTMX, TypeScript, and Postgres.

Requirements:
- 5+ years of production software engineering experience.
- Must have the right to work in the UK; no visa sponsorship.

Location and working pattern:
- Holborn, London / London, UK.
- Onsite, 5 days a week in person.

Salary: £100,000–£120,000 + equity.

Apply: https://stackfix.com/careers/founding-ai-software-engineer?src=haystack
Application email: paddy@stackfix.com

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