Join the team building the 'Duolingo for Everything.' As a Senior Product Engineer, you will own the core intelligence behind a platform serving 1.5 million monthly users. Reporting to the CEO, you'll design agentic workflows and productionize AI features like automated marking and content generation to help one billion people learn.
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Senior Product Engineer at Gizmo
Gizmo.ai is building the 'Duolingo for Everything' and they're looking for a Senior Product Engineer to lead the charge. You'll move beyond simple API calls to build complex agentic workflows and production-grade intelligence that helps millions learn. If you're a TypeScript expert who wants to ship AI features with immediate global impact, this Shoreditch-based role offers a top-of-market salary and meaningful equity.
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Location
London, United Kingdom
Compensation
£170k-£200k + Equity
Company
Gizmo
Role overview
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 will do
- Design and ship end-to-end AI-driven features using a TypeScript stack, from initial concept through to production iteration.
- Build and optimize multi-step agentic prompt workflows and structured model pipelines to handle complex learning tasks at scale.
- Develop internal evaluation frameworks and quality metrics to systematically measure and improve the correctness of AI-generated outputs.
Who this is a fit for
- 8+ years of software engineering experience with deep expertise in TypeScript and building robust, user-facing production systems.
- Proven track record of implementing applied AI, including agentic workflows and structured prompt engineering beyond simple API calls.
- Strong analytical background with a degree in ML, AI, or a quantitative field (Maths/Physics/CS) from a top-tier university.
Why this role is remarkable
- Exceptional growth trajectory with 1.5M monthly active users and $5M ARR, backed by a recent $22M Series A funding round.
- High-impact ownership where you will design the core AI engine that sits at the heart of the product, not just side experiments.
- Work in a elite, flat 10-person engineering team in Shoreditch, collaborating directly with the founders to shape the future of education.
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.
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.
Meet Jack
What happens next?
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 your profile’s a match and Gizmo wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.