Senior AI Engineer

gizmo.ai; City of London; Hybrid; GBP 100,000 - 125,000; Full time

Job summary

A leading AI startup in the UK is seeking an experienced AI Engineer to develop features using the latest LLMs. This full-time role offers a hybrid working model and aims to make learning accessible to everyone. Ideal candidates should have over 10 years of software engineering experience, strong TypeScript skills, and a passion for AI innovation. Join a collaborative team and contribute to a mission-driven company during its exciting growth phase.

Benefits

Highly competitive salary

Equity included

Private health insurance

Qualifications

• 10+ years experience as a software engineer with strong TypeScript knowledge.
• Experience in evaluating AI models and prompts.
• Ability to communicate complex ideas clearly.

Responsibilities

• Design and implement AI features using prompt engineering techniques.
• Evaluate and improve LLM systems.
• Deploy AI models using a TypeScript backend.

Skills

TypeScript

LLM evaluation

Prompt engineering

Education

Degree in Machine Learning/Artificial Intelligence or equivalent experience

Job description

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 $5 million in annual recurring revenue, we’re already one of the fastest‑growing startups in the UK. Backed by leading investors, we recently raised $22 million in Series A funding to accelerate our vision of helping 1 billion people learn.

Role Overview

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.

Key Responsibilities

• 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 TypeScript backend.

Requirements

• You are an experienced software engineer (10+ years experience) with strong knowledge of TypeScript.
• Degree in Machine Learning/Artificial Intelligence OR have experience in 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.

Benefits

• Highly competitive salary.
• Equity included.
• Hybrid working model (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.

Seniority level

Mid‑Senior level

Employment type

Full‑time

Job function

IT Services and IT Consulting