Gizmo

Staff Product Engineer, AI Focus

Gizmo

full-time

Posted on:

Location Type: Hybrid

Location: London • United Kingdom

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Job Level

Lead

Tech Stack

JavaScriptTypeScript

About the role

  • Design and ship AI-driven user-facing features in our TypeScript stack
  • Take ownership of AI features from idea through to production and iteration
  • Collaborate closely with design and product to solve real learning problems with end to end AI solutions
  • Write clean, maintainable, production-ready code
  • Contribute to architectural decisions across backend and AI systems
  • Improve the user experience around AI outputs, including feedback loops and refinement flows
  • Optimise production AI pipelines
  • Design and iterate on prompts, including agentic prompt engineering and multi-step workflows
  • Build structured model pipelines rather than simple single-call integrations
  • Integrate model improvements directly into our TypeScript backend
  • Create novel AI-powered systems to solve new product challenges
  • Prototype and productionise new model-driven capabilities
  • Define what great looks like across different AI use cases
  • Design internal evaluation frameworks
  • Develop clear metrics for quality, correctness and usefulness
  • Evaluate multi-step and agentic workflows for robustness
  • Run structured experiments to drive systematic improvement
  • Build internal tooling to support iteration and experimentation
  • Monitor model behaviour and system health
  • Handle API rate limits and third-party outages
  • Improve resilience, retries and fallback logic
  • Design robust model-calling infrastructure
  • Ensure AI features remain stable and performant under scale

Requirements

  • 8+ years of software engineering experience
  • Strong expertise in TypeScript is preferred; however, we would also consider candidates with strong JavaScript experience.
  • Degree in Machine Learning, Artificial Intelligence, or a related quantitative discipline; alternatively, demonstrable hands-on experience evaluating AI models and prompts in a production environment.
  • Experience building and maintaining production systems
  • Experience shipping user-facing product features
  • Experience designing structured or agentic prompt workflows
  • Ability to define and implement evaluation metrics for AI-driven features
  • Clear communicator who can collaborate with technical and non-technical stakeholders
  • Strong product instincts and a focus on impact
  • **Nice to Have**
  • Previous start-up or founder experience
  • Experience building internal tooling for experimentation and evaluation
Benefits
  • Highly competitive salary
  • You'll own a piece of what you're building - equity included
  • Hybrid and flexible working model with 4 days in our Shoreditch, London office
  • Private health insurance
  • Enhanced parental leave
  • The opportunity to become one of the earliest employees in one of the UK’s fastest-growing startups
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
TypeScriptJavaScriptAI-driven featuresprompt engineeringmodel pipelinesproduction systemsevaluation metricsuser-facing product featuresclean codearchitectural decisions
Soft Skills
collaborationcommunicationproduct instinctsfocus on impactclear communicatorownershipproblem-solvingiterationsystematic improvementresilience
Certifications
degree in Machine Learningdegree in Artificial Intelligencerelated quantitative discipline