Senior Software Engineer - Billing Automation - 12 Month FTC

The Interstellar Squad owns a core part of our commercial platform: the billing run — a mission-critical, high-volume pipeline that turns large-scale usage data into timely, accurate invoices for customers worldwide. It's a technically rich and genuinely complex domain: distributed data processing, event-driven workflows, financial correctness, and operational reliability at scale.

We're looking for a Senior Product Engineer — a hands-on full-stack engineer who is predominantly backend-focused, with deep TypeScript and NestJS experience, but equally able to build React applications. You'll be at home with event-driven processing (Kafka or RabbitMQ) and confident working deep in PostgreSQL. You'll help shape key elements of our billing solution, taking ownership of meaningful pieces of the platform from understanding the business problem through to running your code in production.

The squad is gradually modernising a mature platform into a set of focused, TypeScript-based domain services, using a strangler-fig approach to extract capabilities incrementally while keeping the existing system safe and our customers unaffected. You'll be one of the engineers designing and building those new services, working within the technical direction set by the Engineering Lead.