Senior Software Engineer (up to £100k)

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.

Dex is an AI recruiter agent that helps you run your job search. Tell Dex your stack, seniority, and what you want to build. We will manage your applications and surface other opportunities that are a fit.

The role

This company builds the core infrastructure for planet-scale real-time data. They deliver billions of messages daily to millions of devices for major global brands, operating at the bleeding edge of distributed systems. Backed by leading investors, they're solving hard problems in low-latency, high-availability messaging that few others can touch.

You'll join the Pub/Sub team, the technical backbone of the entire platform. This isn't a feature factory; it's a deep dive into core backend services, where you'll own the design, development, and optimisation of systems engineered for extreme reliability and performance. Expect an AI-first engineering culture that demands human judgment as the ultimate quality bar.

The work

• Design, develop, and deploy core backend services, relentlessly focused on low latency, high availability, and scalability.
• Drive new functionality and initiatives to scale and improve the Pub/Sub platform.
• Ship new features, implement performance improvements, and execute the essential maintenance that keeps planet-scale infrastructure reliable.
• Leverage AI tools for rapid planning, prototyping, and iteration, while retaining full ownership of technical decisions and quality.

What You Bring

• Commercial, production experience with distributed systems, performance analysis, and large-scale infrastructure.
• Proven track record building or working with messaging queues and/or pub/sub systems at real scale.
• Extensive experience with a high-level server-side language; Node.js or Go preferred (a Go-heavy background, e.g. Samsara-style, maps well here).
• A strong, hands-on coder who can clear a deliberately tough technical bar.
• Practical experience using AI tooling to accelerate development, coupled with a clear understanding of where human rigour is indispensable.

As part of the recruitment process at Dex, we process your personal data in accordance with our Privacy Notice for Job Applicants. This notice explains how and why your data is collected and used, and how you can contact us if you have any concerns.