Senior/Staff/Principal Software Engineer (up to £200k)

Dex; United Kingdom; On-site; GBP 120,000 - 180,000; Full time

Job summary

Dex partners with a fast-growing company building the definitive API for global tax automation. You will join a lean engineering team, co‑own the roadmap with product, and operate what you build in production.

The work centers on designing, building, and operating mission‑critical REST APIs powering enterprise compliance. You’ll ship across the stack—Node.js/TypeScript, Go, and ReactJS—and drive architecture decisions to scale with the business.

Qualifications

• Proven experience designing and scaling microservices in high-growth environments.
• Owns code quality, testing, and production readiness with a builder mindset.
• Fluent in English, strong communication across teams.
• Expertise with Node.js/TypeScript, Go or ReactJS on full-stack roles.

Responsibilities

• Design, build, and operate mission‑critical REST APIs powering global tax compliance.
• Take full ownership of products from ideation through delivery and iteration.
• Ship across the stack from backend to customer-facing interfaces.
• Drive architectural decisions to ensure scalability and reliability.
• Promote continuous delivery, shipping fast with high quality standards.

Skills

Node.js/TypeScript

Go

ReactJS

REST APIs

Microservices

Job description

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.

This company is building the definitive API for global tax automation. Think complex financial systems, real-time compliance, and a product suite that plugs directly into enterprise operations. They're backed by leading VCs, have significant ARR, and are growing rapidly, tackling a problem few others can solve at this scale.

You’ll join a lean engineering team that owns problems end-to-end, not just features. This is a principal-level seat: you’ll co‑own the roadmap with product, drive architecture, and operate what you build in production. This isn't a ticket‑taker role; it's about setting the technical bar and shipping fast, continuously, and iteratively across the full product lifecycle.

The work

• Design, build, and operate mission‑critical REST APIs that power global tax compliance for enterprises.
• Take full ownership of products from ideation through delivery, support, and iteration, gaining deep customer insight.
• Ship across the stack, from backend business logic in Node.js/TypeScript and Go to customer‑facing interfaces in ReactJS.
• Drive architectural decisions and tooling choices, ensuring scalability and reliability in a high‑growth environment.
• Champion a culture of continuous delivery, shipping fast and iteratively while maintaining high quality standards.

What You Bring

• Fluency in multiple languages across the stack, with a strong background in Node.js/TypeScript, Go, or ReactJS.
• Proven experience scaling and operating large‑scale microservices in high‑growth environments.
• A strong sense of ownership: you ensure code is tested, features are delivered, and production systems are clean.
• A builder's mindset: you ship fast, continuously, and iteratively, using data to drive decisions.
• Full professional proficiency in written and spoken English.

This is a rare principal‑level role at a rapidly scaling company, often hard to find through traditional channels.