Senior Software Engineer (up to £100k)

Dex; United Kingdom; Remote; GBP 90,000 - 120,000; Full time

Job summary

Dex, in partnership with a planet-scale data infrastructure leader, is seeking a seasoned backend engineer to join the Pub/Sub team. You will own design, development and optimisation of core services with ultra-low latency and high availability.

You'll apply your experience with distributed systems and messaging at scale, coding in Node.js or Go, and using AI tooling to accelerate planning while maintaining rigorous quality.

Qualifications

• Extensive production experience with distributed systems and large-scale infrastructure.
• Proven track record with messaging queues or pub/sub at scale.
• Strong server-side coding in Node.js or Go and measurable performance focus.

Responsibilities

• Design, develop, and deploy core backend services with low latency and high availability.
• Drive new functionality and initiatives to scale the Pub/Sub platform.
• Ship features, implement performance improvements, and maintain planet-scale reliability.
• Leverage AI tools for rapid planning, prototyping, and iteration while owning quality.

Skills

Distributed systems

Pub/Sub systems

Node.js

Go

Performance analysis

AI tooling

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.

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.