Join a high-velocity team building the "Duolingo for everything." As a Principal Product Engineer, you will own major product slices, reporting directly to the CEO. You'll build delightful, gamified learning experiences for over 1 million monthly users, iterating daily based on real-time session replays and metrics in a flat, senior-heavy engineering culture.
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Principal Product Engineer at Gizmo
Gizmo.ai is reinventing learning through gamification and AI, and they’re looking for a Principal Product Engineer to join their elite Shoreditch-based team. If you have 8+ years of experience and want to own major product features from ideation to daily production deployments, this is the highest-impact IC role in London right now.
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This role is no longer actively hiring, but Jack can still help you discover similar open roles that fit.
Location
London, United Kingdom
Compensation
Not Disclosed + 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
- Lead the end-to-end execution of user-facing features, focusing on high-performance React interactions and seamless mobile/web experiences.
- Collaborate directly with the CEO and design teams to transform complex Figma concepts into functional, high-quality code that solves real user problems.
- Maintain full-stack ownership by contributing to PostgreSQL back-end logic and APIs while ensuring the frontend remains world-class and intuitive.
Who this is a fit for
- Expert-level proficiency in React, TypeScript, and Tailwind with 8-20 years of software engineering experience in fast-paced environments.
- Proven "maker" mindset, ideally as a former founder or early-stage startup engineer comfortable with 80/20 frontend-to-backend splits.
- Quantitative background with a degree from a top-tier university and a relentless focus on moving metrics through rapid product iteration.
Why this role is remarkable
- Work at one of the UK’s fastest-growing startups with 1M+ MAUs and $4M ARR, recently backed by $22M in Series A funding to reach 1 billion learners.
- Join a deliberately small, elite engineering squad where every member operates at a Staff or Principal level, including ex-CTOs and former founders.
- High-autonomy environment where you ship to production daily and see the immediate impact of your work on a global user base within hours.
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.