Staff Fullstack Product Engineer at Gizmo.ai

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers. She will pick the best candidates from Jack's network.

The next step is to speak to Jack.

Job Title

Staff Fullstack Product Engineer

Company Description

Gizmo.ai - AI-powered learning platform backed by $22M Series A

Job Description

Join a high-velocity team of four engineers building the "Duolingo for anything." As a Staff-level individual contributor, you will own the technical foundation of a platform serving 1.7M monthly users. Reporting to the CTO, you'll scale backend systems and design features like spaced repetition to help a billion people learn through gamification.

Location

London, UK

Why this role is remarkable

• Massive scale and traction: You will be one of the earliest employees at a startup already generating $5M ARR with 1.7 million monthly active users.
• Significant capital backing: Influence the future of education with the resources of a recent $22M Series A round from top-tier leading investors.
• Founding-level autonomy: Work directly with the Co-Founder/CTO in a flat structure where you own features from architectural concept to production deployment.

What you will do

• Design and scale the high-performance backend services and APIs that power the core learning experience across web and mobile platforms.
• Integrate advanced product capabilities including AI-driven personalization, social mechanics, and spaced repetition algorithms to drive user engagement.
• Collaborate across the full stack to ship seamless features, supporting frontend codebases and technical planning to maintain high engineering standards.

The ideal candidate

• Expert-level fullstack fundamentals with a heavy backend focus and a proven track record of shipping complex, consumer-facing product features.
• Strong proficiency in SQL and experience with Python or TypeScript; comfortable standardizing a growing stack on TypeScript and modern infrastructure.
• A "maker" mindset with previous startup or founding experience, driven by moving the needle on business-critical metrics and user impact.

Next steps

1. Visit our website.
2. Click Talk to Jack.
3. Talk to Jack so he can understand your experience and ambitions.
4. Jack will make sure Jill considers you for this role.
5. If Jill thinks you're a great fit and the client wants to meet you, they will make the introduction.
6. If not, Jack will find you excellent alternatives. All for free.