Integration Engineer

Responsibilities

• Global e-invoicing. Connect Light to e-invoicing networks and country-specific mandates (Peppol and the growing set of national clearance and reporting regimes). Map between formats, manage compliance-driven edge cases, and keep delivery auditable.
• Tax platforms for statutory filing, US sales tax and much more.
• Reliability and reconciliation. Idempotency, retries, webhook and polling strategies, dead-letter handling, and end-to-end reconciliation so that what we think happened and what actually happened always agree.
• Your qualifications
• 4-6 years of experience ideally, plus...
• 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'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

Additional Information

Retire the ERP. 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. This Integrations Engineer role Light is only as powerful as the systems it connects to. Money doesn't move because we say so-it moves because we speak the language of the bank, the e-invoicing network, and the planning tool on the other side, correctly, every time, for every customer entity. This role owns that layer: the interaction surface between Light and the rest of the financial world. You'll build and operate the integrations that let Light plug into multi-tenant banking APIs (J.P. Morgan, HSBC, and peers), global e-invoicing networks, and tax platforms and more. This is backend-heavy, data-integrity-critical work where a dropped message or a silent reconciliation mismatch is not an acceptable outcome. You'll design the abstractions that turn a dozen incompatible partner APIs into one coherent internal model, and you'll keep those abstractions honest as partners change their specs underneath you.

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