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.
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-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 you are
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
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.
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.
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