Full Stack Developer jobs in United Kingdom

Light exists to replace factory-era ERPs with software that feels alive. Our Smart Financial Platform gives modern, global companies superpowers—automated accounting, real-time reporting, and financial flows that move at the speed of the business.

We build with our customers, ship fast, and obsess over craft. In a short time, Light has gone from idea to the operating core for leading companies like Lovable, Legora, and Keyshot. People don’t just use Light—they enjoy it.

We’re an early team defining a new software category. Think engineers who love debits and credits, designers who care about reconciliation states, and operators who treat finance as a product. If you’re excited to modernize how the world runs money—one workflow at a time—you’re in the right place.

Backed by world‑class investors and advised by industry titans, we’re building category‑defining products with the freedom to ship ambitiously and own outcomes.

Come help us make Light the global default for next‑gen finance.

• Building our core Smart Financial Platform further that helps multinational companies manage all of their accounting with AI and a great UX.
• Keeping focus on customer needs while implementing robust and scalable technical solutions.
• Developing and optimizing backend services, APIs, and infrastructure to support our high‑performance frontend applications.

• 4+ years of experience building robust backend systems with solid understanding of server‑side architecture and API design.
• Strong command of backend programming languages, with the ability to write clean, efficient code.
• Proficiency in Kotlin / Java, JVM, PostgreSQL, AWS
• Experience designing and implementing RESTful APIs and DB schemas that scale.
• Deeply care about quality - you actively participate in code reviews, write comprehensive unit and integration tests, and thoroughly QA your work.
• Great communicator who collaborates effectively with frontend engineers on API design and cross‑functional teams on system architecture.
• You can commit and ship production‑ready code that is secure, scalable, performant, and maintains well.
• Practical experience using AI or emerging technology tools to improve productivity, insight, or decision‑making, with the ability to apply first‑principles thinking to new problems.

• Experience with accounting or companies' finance flows (accounts payable, invoicing, payments etc).
• Building AI‑naitive robust and scalable applications.
• You've been thriving in high‑growth startups.

• Hosted on AWS
• Postgres DB
• Kotlin Monolith
• React Frontend

In addition to being part of a great team and working in a really fun and innovative environment, we offer:

💸 A competitive salary + potential stock options
🏝 25 days of annual leave + public holidays in the country where you are based.
🥳 Regular socials and company off‑sites
🚀 A huge opportunity for career growth as you'll help shape a market‑defining product.

Working at Light means you're embarking on an exciting journey to reshape the future of multinational financial operations. Our cheat‑code is that we've built something like this before - and are now doing it again, only better. Our goal is to make global finance effortless and empower companies to make informed decisions.

Join the rocket ship while it's taking off 🚀