Founding Full Stack Engineer

Burns Sheehan; London; On-site; GBP 100,000 - 120,000; Full time

Job summary

Join a leading stealth-mode AI start-up as a Founding Full Stack Engineer in London, where you'll help shape a personalized shopping experience using advanced AI technology. This role offers a competitive salary of up to £120,000 plus stock options, with a focus on building innovative solutions from scratch. Ideal candidates will have a strong background in both front and back-end development, as well as experience with modern AI tools.

Qualifications

• Strong experience building polished frontend and scalable backend systems.
• Comfort using modern AI tools and platforms in your workflow.
• A 0→1 mindset with a proven record of launching projects from scratch.

Responsibilities

• Design and build the alpha version of the AI platform from the ground up.
• Prototype and ship customer-validated features across frontend and backend.
• Collaborate closely with cofounders in a small, high-trust team.

Skills

Frontend Development

Backend Development

AI Tools

Customer Focus

Fast Learning

Tools

Microsoft Stack

Python

Go

Rust

Cursor

CLINE

Windsurf

Job description

3 days ago Be among the first 25 applicants

This range is provided by Burns Sheehan. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

Base pay range

Direct message the job poster from Burns Sheehan

Senior Director - Engineering at Burns Sheehan

Founding Full Stack Engineer – Consumer AI (Stealth Mode)

London – 2-3 days a week in the office

Up to £120,000 plus generous stock options

Are you a Full Stack Engineer ready to build something radically new in AI and consumer tech?

Founding Full Stack Engineer – We are working with a stealth-mode, consumer AI start-up backed by top-tier US and European VCs to find a Full Stack Engineer to join the Founding team. Their mission is to help people make smarter spending decisions with the help of AI agents that understand their needs, habits and trusted social circles. They are building a completely new kind of shopping experience—deeply personalized, socially intuitive, and powered by the latest in generative AI. This is a massive, untapped opportunity in a $1tr+ category.

They are looking for a Founding Full Stack Engineer to help shape the product, stack and culture from day one. You don’t need to cover all of the below as what they are looking for most are Full Stack Engineers with a product-mindset, a bias for action who enjoys building things from scratch and learning as you go!

What you’ll do as a Founding Full Stack Engineer:

• You will design and build the alpha version of their AI-powered platform from the ground up.
• Design, prototype and ship fast, customer-validated features across frontend and backend.
• Craft seamless, mobile-first experiences that feel intuitive, fast and personal.
• Experiment with GenAI tooling to supercharge your workflow and product capabilities.
• Collaborate closely with the cofounders in a small, high-trust, mission-driven team.

What they’re looking for in a Founding Full Stack Engineer:

• Strong experience building polished frontend and scalable backend systems.
• A 0→1 mindset: You’ve launched things from scratch, either at startups or on your own and enjoy fast iteration cycles, direct user feedback, and high ownership.
• Comfort using modern AI tools and platforms in your workflow.
• A customer-obsessed, fast-learning engineer who cares about real-world impact.

They are pragmatic about using the right tool for the job and while the backend relies heavily on the Microsoft stack they actively consider other languages like Python for data-heavy tasks, Go for microservices or Rust where performance is key. They are constantly evolving their GenAI toolkit and are currently using Cursor, CLINE, Windsurf.

This is a fantastic opportunity for a Founding Full Stack Engineer to join a well-funded AI start-up. Please reply with your CV or call Simon for a chat.

Founding Full Stack Engineer – Consumer AI (Stealth Mode)

London – 2-3 days a week in the office

Up to £120,000 plus generous stock options

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Information Technology

• Industries

  Technology, Information and Media, Software Development, and IT System Custom Software Development

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