Senior AI Engineer

Role Overview

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.

As an AI Engineer at Gizmo, you'll report directly to the CEO/Co-Founder and play a key role in shaping the product experience for our rapidly growing user base. You'll work closely with the wider engineering team to build, test and ship features that bring our vision to life. This role is ideal for someone looking to develop deep expertise in evaluating LLMs.

You'll be joining a fast‑paced, collaborative team during an exciting stage of growth, with plenty of opportunity to make a significant impact and grow alongside us as we scale.

• Design and implement AI features by leveraging prompt engineering techniques using the latest LLMs (e.g., Gemini 3, ChatGPT 5).
• Use the latest LLM evaluation techniques to assess and improve our LLM systems.
• Deploy and integrate AI models into production environments using our Type Script backend.

• Experienced software engineer (10+ years experience) with strong knowledge of Type Script.
• Degree in Machine Learning / Artificial Intelligence or experience evaluating AI models and prompts.
• Clear communicator who can break down complexity and collaborate effectively.
• Driven by impact – you prioritise work that moves the needle.
• Self‑starter with a maker mindset. We're looking for ex‑founders or individuals with start‑up experience.

• Highly competitive salary.
• Equity included.
• Hybrid working model with 4 days in our Shoreditch, London office.
• Opportunity to become one of the earliest employees in one of the UK's fastest‑growing AI startups.
• Private health insurance.

Mid–Senior level

Full‑time

IT Services and IT Consulting

London, England, United Kingdom

£70,000–£100,000