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# Principal Software Engineer (Defence)

- **Company:** Client Server
- **Location:** Newcastle upon Tyne, UK (Remote available)
- **Salary:** £110,000.0 - £140,000.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Amazon Web Services, Microsoft Azure, C Sharp (Programming Language), Distributed Systems, Python (Programming Language), Software Construction, TypeScript, Google Cloud, SC Clearance, Information Technology
- **Published:** July 30, 2026
- **Apply:** https://www.client-server.com//job/principal-software-engineer-defence/apply

## About the Role

Are you a hands-on Principal Software Engineer with experience of building high performing teams and shaping engineering excellence?, * You have achieved a minimum 2.1 BSc in Computer Science or similar technical discipline from a top tier / Russel Group university, backed by A's at A-level

 * You're a technologist who enjoys collaborating and problem solving, working on complex, distributed systems
 * You have strong experience in the defence / national security sector
 * You have a strong technical background - you can come from any tech background (e.g. C#, Java, Python, TypeScript, Full Stack), public cloud technologies - Azure, AWS, GCP
 * You have a good knowledge of modern software engineering best practices and have experience across the full software development lifecycle
 * You have a thorough understanding of Computer Science fundamentals such as OOP, Data Structures, Design Patterns, Algorithms
 * You're excited to join a scale-up in a role that you can shape and influence
 * You have SC Clearance or are eligible to achieve it, ideally you will have experience of working with defence sector clients

## Description

You could be progressing your career at a rapidly growing technology consultancy as it expands into the Defence and National Security sector. Already well established within Financial Services, the business is investing heavily in its Defence capability, giving you the chance to play a key role in defining its technical direction from the outset.

Collaborating with the CTO, as a Principal Software Engineer you'll lead and grow the Defence engineering function, setting engineering standards, establishing best practices and fostering a culture of technical excellence. You'll provide technical leadership across multiple projects, mentor and develop engineers and help shape the tools, processes and technologies that will underpin future growth.

This is a leadership role for someone who still enjoys solving complex technical problems. You'll act as a senior technical authority, guiding architectural decisions, promoting modern software engineering practices and ensuring teams deliver secure, scalable, high-quality solutions for Defence clients.


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