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. If you're interested sign up to Dex to apply. 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 real-time messaging, powering billions of messages daily across millions of devices. They're a Series B company, backed by leading investors, tackling planet-scale distributed systems problems at the edge. This isn't just another SaaS application; it's the foundational layer for real-time data. You'll join the Pub/Sub team, the technical backbone of the entire platform. This is a hands-on Senior Software Engineer role, focused on designing and optimising backend services for extreme low latency, high availability, and scalability. This isn't a role for managing others or just integrating APIs; it's for a deep technical contributor who thrives on owning critical distributed systems problems from design to deployment, with an AI-first approach that still demands human rigour. The work Design, develop, and deploy core backend services for a planet-scale edge messaging platform. Optimise systems for extreme low latency, high availability, and fault tolerance, handling billions of messages daily. Drive new features and initiatives to scale and improve the Pub/Sub platform, from concept to production. Tackle complex distributed systems challenges, ensuring reliability and performance for millions of devices. Leverage AI tooling for rapid prototyping and iteration, while maintaining full ownership and accountability for technical decisions and quality. What You Bring 5+ years of commercial experience building and operating distributed systems and large-scale infrastructure in production. Proven experience with messaging queues or pub/sub systems at significant scale. Extensive hands-on coding experience in Go or Node.js, with a preference for Go. A track record of self-starting, making independent technical decisions, and navigating ambiguity in complex environments. You use AI tools to accelerate development, but your judgment and rigour define the quality bar. Why apply through Dex This is a rare, high-impact role at a company that doesn't advertise widely. Apply through Dex to get a full brief on the client and role, skip the cold application process, and ensure your profile is seen by the right hiring manager. We help you cut through the noise and get straight to the roles that truly fit. If you're interested, sign up to Dex to apply - https://jobs.meetdex.ai/jobs/a33c5a90-db31-4bd3-84b3-405186c4129a 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.