Staff Fullstack Product Engineer at Gizmo.ai

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; you are 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.

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