Principal Software Engineer

ð Senior / Principal Software Engineer

ð Berkshire | ð Permanent | On-site

Build secure software. Solve complex problems. Shape next-generation defence technology.

Copello are partnering with a leading defence and cyber organisation in Berkshire to find an experienced Senior/Principal Software Engineer to join a highly skilled engineering team.

This is a fantastic opportunity for a software engineer who enjoys technical ownership, complex problem-solving and hands-on development , working on secure, mission-critical products across embedded and application environments.

ð» The Role

You’ll take technical responsibility across the software development lifecycle — from requirements and architecture through to design, implementation, testing and verification.

You’ll be involved in:

• Designing and developing embedded and/or application software .
• Working with C and C++ across bare-metal, RTOS and Linux environments.
• Developing robust, reusable software using Object-Oriented Design and SOLID principles .
• Supporting software architecture, requirements and technical design.
• Driving best practice across TDD/BDD, CI, DevSecOps and automated testing .
• Working closely with Systems, Hardware and Firmware engineers.
• Leading technical reviews and contributing to key engineering decisions.
• Mentoring and supporting less experienced engineers.
• Contributing to technical proposals, bids and future product development.
• Driving improvements in software tools, processes and engineering practices.

ð What we're looking for

We’re keen to speak with experienced Software Engineers who have:

Strong C/C++ experience
Significant experience in embedded software development
Experience with bare-metal, RTOS and/or Embedded Linux
Strong understanding of software development lifecycles and best practice
Experience with Object-Oriented Design and Design Patterns
Strong software testing and design-for-test experience
Experience working in complex or regulated environments

Knowledge of Rust, TCP/IP, MISRA, DevSecOps, CI/CD, DOORS, UML, SysML or Enterprise Architect would be advantageous.

ð Why this opportunity?

You’ll be working on secure, mission-critical technology within a highly technical defence environment, with the opportunity to influence architecture, develop your technical expertise and mentor the next generation of engineers.

The role offers a strong benefits package, including bonus, private medical, enhanced pension, 25 days' holiday + bank holidays, flexible benefits and a potential early Friday finish .

ð Security clearance: Candidates will need to be eligible to obtain and maintain SC and DV clearance .

If you’re a Senior Software Engineer, Principal Software Engineer, Embedded Software Engineer or Technical Lead looking for your next challenge, get in touch.

ð Victoria –
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