light-inc - Integration Engineer

• You build things. Not prototypes, not demos. Working software in production, doing something real for real users. This is the non-negotiable. • You've built integrations against unforgiving external systems. APIs you don't control, that fail in ways the docs don't mention, where correctness is contractual. You know how to defend a system against a partner that returns a 200 with an error in the body. • You know banking and payments APIs. Direct, hands-on experience with corporate banking, treasury, or payments APIs is what sets the strongest candidates apart. Experience integrating J.P. Morgan or HSBC specifically—their developer platforms, auth models, and payment and reporting APIs—is highly valuable and a genuine differentiator for this role. Familiarity with ISO 20022, SWIFT, virtual accounts, or open banking is a strong signal. • You are excited about AI. You use AI tooling efficiently to improve your work. At Light, a lot of code is written with AI, which means the hard part is increasingly the thinking: deciding what to build, reviewing what comes back, and catching where the model is confidently wrong. You know when AI speeds you up, when it's likely to mislead you, and how to lean on it while staying fully responsible for what ships. • You're comfortable across the stack. You don't need to be a specialist in everything, but you can't have a lane you refuse to leave. Our stack is Kotlin and React, and this role leans backend. If you're strong on the backend and curious about the rest, that works. • You care about data integrity. You think about the person on the other end and the money moving between them. You notice when a flow is correct but fragile, and you act on it. • You ship early and often. Small batches. Learn. Go again. You'd rather put something real in front of a customer than spend another week perfecting it in isolation. • Experience in fintech or systems where data integrity is non-negotiable • Familiarity with accounting concepts: debits, credits, reconciliation • Experience with e-invoicing standards or country-specific compliance regimes • Background in high-growth startups where everything was still being figured out • We build on AWS, with a Kotlin backend, a React frontend, and infrastructure managed in Terraform. It's a real production system that global finance teams depend on every day. The integration layer you'll own sits squarely in the Kotlin backend, talking to a long list of external partners. You don't need to have used every piece of it. You do need to be comfortable in this kind of environment: real scale, real customers, real stakes. • 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 • THE FAMOUS LAST WORDS • 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.