Senior AI Engineer

Gizmo; City Of London; Hybrid; GBP 70,000 - 90,000; Full time

Job summary

An innovative AI startup in London is seeking an experienced AI Engineer to design and implement AI features and evaluate LLM systems. Candidates should have over 10 years of software engineering experience, strong knowledge of TypeScript, and a passion for impactful work. Join a fast-paced team with a hybrid working model and opportunities for significant growth. Competitive salary and equity included.

Benefits

Competitive salary

Equity included

Private health insurance

Hybrid working model

Qualifications

• 10+ years experience in software engineering.
• Experience in evaluating AI models and prompts is accepted.
• Self-starter with relevant startup experience.

Responsibilities

• Design and implement AI features using LLMs.
• Evaluate and improve LLM systems.
• Deploy AI models using TypeScript backend.

Skills

Typescript

AI model evaluation

Prompt engineering

Collaboration

Communication

Education

Degree in Machine Learning/Artificial Intelligence

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 $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.

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.

Qualifications

• 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.
• You'll own a piece of what you're building - equity included.
• Hybrid working model with 4 days in our Shoreditch, London office.
• The opportunity to become one of the earliest employees in one of the UK’s fastest-growing AI startups.
• Private health insurance.