---
title: 'AI Engineering Intern at Light'
canonical: 'https://feeny.ai/job/ai-engineering-intern-light-london-y0p69nzcr5m1'
type: 'job'
last_seen: '2026-09-16'
---

# AI Engineering Intern at Light

- **Company:** Light
- **Location:** London, United Kingdom
- **Employment:** internship
- **Work type:** onsite
- **Posted:** 2026-09-13
- **Last confirmed live:** 2026-09-16
- **Apply:** https://jobs.ashbyhq.com/light-inc/9079d1ba-a35a-4e4b-9b07-820e85d921b9

## Job description

At Light, we’re redefining how software is built, how it’s delivered, and how it works. We’re building organic software. Software that heals itself. Software that adapts to the user and the business. Software that learns and gets better as it’s used. Our starting point is finance. Companies including Legora, Lovable, and Fuse Energy already run on Light. We’re building towards a platform that understands how each business operates and evolves with it. As an AI Engineering Intern, you’ll help make that happen: building systems that identify mistakes, improve their own behaviour, and prove those improvements work. You’ll 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’re applying with an equivalent achievement, explain the competition or field, your result, and the standard required to achieve it. If you’re at Oxford/Cambridge and you don’t 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’ll work on

You’ll 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’ll 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’ve shipped.

You’ll work alongside exceptional colleagues. What else we’re looking for

- Strong programming ability.
- Something you’ve 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 didn’t 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’ll help define those measures and use them to assess what you build.

## What you’ll 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.

How to apply Send your CV. Include a link to something you’ve shipped. Tell us what it does, which parts you built yourself, where it failed, and how you fixed it. Then explain why you want to work on organic software at Light. We want to understand how you think, what you can build, and what you’re ready to take on next. Light is an equal opportunity employer.

## About Light

## Company Overview
- **One-liner**: Light provides an AI-native, multi-entity financial platform (ERP) that automates global accounting, AR, AP, expenses, and financial reporting for multinational technology companies.
- **Entity Type**: Private (Series A)
- **Headquarters**: Copenhagen, Denmark
- **Founded**: 2022
- **Founders**: Jonathan Sanders (CEO) and Filip Kozjak (CTO)

## Core Business
- **Primary industry/industries**: Financial Software / Enterprise Resource Planning (ERP) / Fintech
- **Target customers**: B2B, specifically multinational technology companies and businesses with complex multi-entity accounting needs.
- **Mission or purpose statement**: To build the Smart Financial Platform, redefining ERP by shipping fast, joyful features built for finance and revolutionizing the world’s largest and oldest software category. [light.inc](https://light.inc/careers)

## Products & Services
- **Light Platform (AI-Native Financial Platform)**: A unified SaaS platform that combines General Ledger, Accounts Receivable, Accounts Payable, expenses, bookkeeping, and financial reporting. It is built on a best-in-class in-memory HTAP database for instant reporting and is designed to scale to billions of transactions. Key features include immutable record keeping, AI-powered accounting (e.g., a "finance companion" for snapping receipts and answering policy questions), automated workflows, and multi-entity consolidation. [light.inc](https://light.inc/?ref_type=organic)

## Market Standing
- **Valuation/Market Cap**: Not publicly available.
- **Key Metric**: **Total Funding: $43 Million**. This includes a $13M Seed round (led by Atomico, June 2024) and a $30M Series A (led by Balderton Capital, October 2025). [linkedin.com](https://www.linkedin.com/company/uselightinc)
- **Notable Investors/Partners**: Atomico (Seed lead), Balderton Capital (Series A lead). The team is also crafted by engineers and designers from world-class companies like Spotify, X, AWS, Klarna, Google, and Shopify. [light.inc](https://light.inc/careers)
- **Growth Signals**: The company is in a "high-velocity go-to-market phase" with rapid customer onboarding. Headcount has grown **+175% year-over-year** (from ~22 to 61+ employees). The company is actively shipping features faster than ever and fielding many RFPs. [light.inc](https://light.inc/careers), [linkedin.com](https://www.linkedin.com/company/uselightinc)

## Competitive Advantages
- **AI-Native Architecture**: Unlike legacy ERP systems (e.g., NetSuite), Light is built from the ground up as an AI-first platform, enabling features like automated workflows, smart predictions, and a conversational finance assistant.
- **Performance at Scale**: Built on an in-memory HTAP (Hybrid Transactional/Analytical Processing) database, Light boasts sub-500ms response times for any transaction or report, even at billions of transactions, whereas competitors can take up to 100 seconds. [light.inc](https://light.inc/?ref_type=organic)
- **Immutable Ledger**: Uses an immutable ledger for perfect audit trails, a critical feature for compliance that traditional, editable databases lack. [light.inc](https://light.inc/?ref_type=organic)
- **Multi-Entity Focus**: Purpose-built to solve the extreme complexity of multinational accounting, eliminating the need for a "finance frankenstack" of multiple disconnected systems. [light.inc](https://light.inc/?ref_type=organic)

## Strategic Focus
- **Go-to-Market Velocity**: The company is aggressively scaling its sales, onboarding, and customer experience teams to capture market demand.
- **Product Velocity**: Shipping new features and improvements at a rapid pace, focusing on making the platform more intuitive and powerful.
- **Global Expansion**: With offices in London, Copenhagen, and New York, and a remote team across Europe and the Americas, Light is building a global presence to serve international customers. [light.inc](https://light.inc/careers)
- **Talent Acquisition**: Actively hiring across engineering, sales, implementation, and AI strategy to fuel its growth phase.

## Why Work Here
- **Culture**: The company values speed, simplicity, clarity, and joy. They emphasize a "joyful user experience" for both customers and employees.
- **Work Environment**: Offers a hybrid/office model with physical offices in London, Copenhagen, and New York. Employees typically work from physical offices. [builtin.com](https://builtin.com/company/light-lightinc)
- **Perks & Benefits**: Includes healthcare benefits (dental, health, vision), life insurance, 401(K) (US), generous parental leave, company equity, and free snacks/drinks. They also have quarterly team events ("Starsite") in iconic European cities. [builtin.com](https://builtin.com/company/light-lightinc), [light.inc](https://light.inc/careers)
- **Impact**: Opportunity to work on a "world-class" product redefining a massive, legacy software category (ERP) with a highly skilled team from top tech companies. The engineering culture is described as "crafting the AI-native financial platform" with a focus on speed and quality. [light.inc](https://light.inc/careers)

## Sources
1. [light.inc](https://light.inc/careers)
2. [builtin.com](https://builtin.com/company/light-lightinc)
3. [light.inc](https://light.inc/?ref_type=organic)
4. [linkedin.com](https://www.linkedin.com/company/uselightinc)
5. [builtinnyc.com](https://www.builtinnyc.com/company/light-lightinc)

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