AI Engineering Intern

Light Inc; Greater London; On-site; GBP 22,000 - 33,000; Part time

Benefits offered by this job

Competitive internship pay

London office role

Ownership from day one

Job summary

Light invites an AI Engineering Intern to join our London team, building organic software and proving self-healing systems with agents, models, and infrastructure.

You will train and deploy LLM/ML models, improve agent behavior, and own end-to-end projects that demonstrate real customer value. Strong programming and hands-on AI tooling experience are expected.

Qualifications

• You are currently studying at Oxford or Cambridge.
• You have a silver medal or higher at IMO/IOI or equivalent.
• Open-source contributions, deployed models, or evaluation pipelines are a plus.
• Strong problem-solving, curiosity, and clear communication are expected.

Responsibilities

• Help agents learn from their work and improve instructions.
• Train and deploy LLM/ML models and run experiments.
• Build end-to-end agents with ownership from problem to delivery.
• Create tests and evaluations to catch failures before customers.

Skills

Strong programming

AI tooling experience

System debugging approach

Communication skills

Education

Oxford or Cambridge student

IMO/IOI medal or equivalent

Tools

LLM APIs

Agent frameworks

Model fine-tuning

Job description

At Light, we are redefining how software is built, how it is delivered, and how it works.

We are building organic software. Software that heals itself. Software that adapts to the user and the business. Software that learns and gets better as it is used.

Our starting point is finance. Companies including Legora, Lovable, and Fuse Energy already run on Light. We are building towards a platform that understands how each business operates and evolves with it.

As an AI Engineering Intern, you will help make that happen: building systems that identify mistakes, improve their own behaviour, and prove those improvements work. You will work on the agents, models, and infrastructure that turn organic software into something customers can rely on.

Who this is for

You must meet both of these requirements:

• Currently studying at University of Oxford, or University of Cambridge.

• A silver medal or higher at the International Mathematical Olympiad (IMO) or International Olympiad in Informatics (IOI), or an equivalent level of achievement in another highly competitive endeavour.

If you are applying with an equivalent achievement, explain the competition or field, your result, and the standard required to achieve it. If you are at Oxford/Cambridge and you do not have an equivalent level of achievement we encourage you to not apply.

Our bar for internships at Light is high. You will need the curiosity to explore unfamiliar areas, the willingness to go the extra mile to get things right, the discipline to test your assumptions, and the persistence to keep going when your first approach does not work.

What you will work on

You will have access to our repositories, real engineering problems, and an internal coding agent that already opens pull requests against production code. Your work will help make these systems more capable and reliable.

• Help agents learn from their work. Our agent reviews merged pull requests and corrections to update its repository-specific instructions. You will shape that process, catch misleading lessons, and test whether new instructions improve its performance.

• Train and deploy LLM and ML models. Fine-tune SoA LLM models. Run experiments, compare results against the existing pipeline, and establish whether a model is ready for production. Leverage ML tools to enhance the ability of our Agents via e.g. K-means, t-sne, PCA, random forest trees etc. etc.

• Build Agents. Take full end to end ownership of an agent. Agent do pre-emptive support for the self-healing pipeline; they fix; they communicate with customers; etc.

• Build evaluations and review tools. Define what a correct answer looks like, create tests that expose failures, and help catch poor output before it reaches customers.

• Own projects through delivery. Scope the problem, build the solution, debug regressions, and follow through until the customer can rely on what you have shipped.

You will work alongside exceptional colleagues.

What else we are looking for

• Strong programming ability.

• Something you have built beyond coursework or tutorials: a model, agent, tool, or application that does useful work.

• Hands-on experience with AI tooling, such as LLM APIs, agent frameworks, model fine-tuning, or automated workflows.

• A habit of investigating why a system failed and testing whether your fix addresses the cause.

• Clear thinking and the ability to explain your decisions, including what you tried and why it did not work.

Open-source contributions, deployed models, and experience building evaluation pipelines are a plus.

How we’ll measure success

Your work should produce measurable improvements: more correct agent-generated changes, better model accuracy, fewer failures reaching users, or tools the team continues to use. You will help define those measures and use them to assess what you build.

What you will get

• Internship compensation above the standard market rate.

• A role based in our London office, working alongside the product and engineering team.

• Ownership from your first day, with a path to shipping work into production.

Light is an equal opportunity employer.