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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Product Engineer at Gizmo
Join one of the UK's fastest-growing AI startups as they scale a learning platform to 1 billion users. 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.
About this role
Role overview
About the company
Gizmo
Software
Gizmo is an AI startup on a mission to make learning so easy that anyone can learn anything. We're building Duolingo for Anything - a platform that uses gamification and social mechanics to make learning fun. With over 1.5 million monthly active users and $5M in annual recurring revenue, we’re already one of the fastest-growing startups in the UK. Backed by leading investors, we recently raised $22M in Series A funding to accelerate our vision of helping 1 billion people learn.
What you'll do
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.
Who you are
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.
Why this role
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 15 million jobs daily and helps you discover roles at companies like this.
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.