Principal Software Engineer (up to £200k)

This company is building an API-first platform for global tax automation. Think sales tax, VAT, GST compliance for enterprises, all delivered through a world-class API. It’s a complex, critical problem, and engineering sits at the absolute center of the business. They’re backed by leading VCs, with significant Series B funding.

This is a Principal-level seat. You’ll join a lean team that owns customer problems end-to-end, not just features. You’ll co-own the roadmap with product, taking architecture, tooling, coding, testing, deployment, and operations from ideation to iteration. This isn’t a role where you just execute; you’re expected to set the technical bar, not follow it.

The work

• Design, build, and operate critical REST APIs that power global tax compliance for enterprise customers.
• Own features across the full stack, from backend business logic to customer-facing interfaces.
• Take products through their entire lifecycle: ideation, delivery, support, and continuous iteration.
• Scale and operate large-scale microservices in a high-growth, API-first environment.

• Proven experience scaling and operating large-scale microservices in production.
• Fluency in multiple languages across the stack (e.g., Node.js/TypeScript, Go, ReactJS).
• A strong sense of end-to-end ownership: from architecture to operations, testing to delivery.
• A builder’s mindset, shipping fast and iteratively, using data to drive decisions.
• Full professional proficiency in written and spoken English.

This role is with one of Dex’s trusted partner companies. We work closely with their teams to truly understand their culture, goals, and what they’re looking for, so we can match you with the right opportunity and give you context about the role before you commit to a process.