Principal Software Engineer £95,000 + Bonus + Benefits

Method Resourcing Solutions Ltd; Milehouse; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A leading infrastructure technology company is seeking a Principal Software Engineer to design scalable systems and lead technical decisions. This hands-on role involves mentoring, working on critical infrastructure projects, and shaping software architecture. Ideal candidates will have extensive experience in distributed systems and modern programming frameworks, contributing to a significant platform rebuild.

Qualifications

• Proven experience building and running distributed systems at scale.
• Deep fluency in modern programming languages and frameworks.
• Experience delivering secure, high-availability software into production.

Responsibilities

• Design and build scalable, distributed systems.
• Lead technical decision-making across domains.
• Own the delivery of complex features.

Skills

Distributed systems

Modern programming languages

Microservice principles

CI/CD pipelines

Software security

Job description

Principal Software Engineer
£95,000 + Bonus + Benefits | Hybrid (UK)

Method is partnering with a leading infrastructure technology company that's rebuilding its software architecture from the ground up. The mission is to create connected, secure, and scalable systems that enable smarter infrastructure, and deliver trusted connectivity across multiple sectors.

They're looking for a Principal Software Engineer, a hands-on technical authority who will set engineering standards, solve complex challenges, and shape the next generation of event-driven microservices powering their global platform.

The role
You'll work at the top of the engineering track, designing and delivering high-performance, distributed systems while guiding others through implementation and problem-solving. This is a deep technical role, ideal for someone who thrives on code, architecture, and tangible impact.

What you'll do

• Design and build scalable, distributed systems that support safety-critical environments.
• Lead technical decision-making and resolve engineering challenges across domains.
• Own the delivery of complex features, ensuring performance, resilience, and maintainability.
• Collaborate with Engineering Leads, Architects, and Product to translate roadmap goals into reality.
• Contribute to a 5-year architectural refresh, evolving systems to event-driven microservices.
• Mentor engineers through design reviews, pairing, and best-practice development.
• Maintain and improve CI/CD pipelines, test automation, and production reliability.

What you'll bring

• Proven experience building and running distributed systems at scale.
• Deep fluency in modern programming languages and frameworks.
• Experience delivering secure, high-availability software into production.
• Strong understanding of architecture, design patterns, and microservice principles.
• Ability to balance hands-on coding with architectural oversight and mentorship.
• Curiosity to explore new tools, paradigms, and emerging technologies.

Why join
This is a rare opportunity to work on systems that make a tangible difference, connecting critical infrastructure through advanced engineering. You'll be at the forefront of a long-term platform rebuild, working with modern architectures, cloud-native tooling, and a leadership team that genuinely invests in engineering excellence.

RSG Plc is acting as an Employment Agency in relation to this vacancy.