You will lead the development of production-grade AI systems for a platform serving 1.7 million monthly active users. Reporting to the CEO, you will ship features like automated marking and agentic workflows using TypeScript. This is a high-impact role focused on building the core intelligence behind a rapidly scaling global learning product.
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London, United KingdomUp to £200k + Equity
Product Engineer at $22M Series A AI learning startup
Join one of the UK's fastest-growing AI startups as they scale a learning platform to 1 billion users. With 1.7 million monthly active users and $5M ARR, this $22M Series A company is looking for a Staff-level Product Engineer to lead their AI initiatives. Working directly with the CEO, you will ship production-grade LLM features and agentic workflows that redefine how the world learns. If you have 8+ years of experience and a passion for high-impact AI, this Shoreditch-based role offers up to £200k plus equity.
Overview
Role overview
Company
Gizmo
Software
$22M Series A London AI learning startup backed by top-tier investors
Responsibilities
What you will do
- Design and ship end-to-end AI features in TypeScript, including study material generation, automated marking, and structured content ingestion.
- Architect and iterate on sophisticated agentic prompt workflows and multi-step model pipelines using GPT-4, Claude, and Gemini.
- Build internal evaluation frameworks and tooling to systematically measure and improve AI output quality, correctness, and system reliability.
Candidate profile
Who this is a fit for
- Offers 7-8+ years of software engineering experience with deep expertise in TypeScript and a proven track record of shipping user-facing products.
- Demonstrates practical experience deploying LLMs in production, including prompt engineering, model evaluation, or an academic background in ML/AI.
- Thrives in early-stage environments, possessing strong product instincts and the ability to solve complex technical challenges with minimal supervision.
What makes it remarkable
Why this role is remarkable
- Join one of the UK’s fastest-growing startups with $5M ARR and a mission to help 1 billion people learn through gamified AI education.
- Work directly with a founding team of Cambridge graduates and former Amazon/Google leaders in a high-autonomy, low-process environment.
- Access a generous compensation package including a salary up to £200k and meaningful equity in a recently funded Series A company.
Jack & Jill
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Meet Jack
Jack gets to know what you're great at and what you want next, then searches 14 million jobs daily and introduces you directly to hiring managers.
How does this work?
Jack's an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack's network.
If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.
Jack