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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London, UK£170K - £200K + Equity
Featured roleLondon, UK£170K - £200K + Equity
Senior Product Engineer at Gizmo.ai — AI-powered learning platform
Gizmo.ai is building the 'Duolingo for Everything' and they're looking for a Senior Product Engineer to lead the charge. With 1.5M monthly users and a fresh $22M Series A, this is a rare chance to own the AI core of a high-growth startup. 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.
Overview
Why this role stands out
Company
Software
Gizmo.ai - Fast-growing EdTech startup recently raised a $22M Series A
Responsibilities
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.
Candidate profile
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.
What makes it remarkable
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.
About Jack & Jill
Meet Jack
Jack gets to know what you are great at, what you want next, and makes sure Jill considers you for the right opportunities.
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