Principal Software Engineer

Overview

In this role you will own the end-to-end software lifecycle for secure, mission-critical products in a defence environment. You’ll lead embedded and/or application software development, shaping architecture with cross-functional teams and mentoring engineers. You will drive robust testing, modern engineering practices, and technical reviews to deliver reliable, scalable solutions. This position offers hands-on impact, technical growth, and the chance to influence secure software at scale.

Pay / Benefits

• bonus
• private medical
• enhanced pension
• 25 days' holiday + bank holidays
• flexible benefits
• potential early Friday finish

Responsibilities

• Design and develop embedded and/or application software
• Use C/C++ across bare-metal, RTOS, and Linux environments
• Apply Object-Oriented Design and SOLID principles
• Support software architecture, requirements, and technical design
• Advocate TDD/BDD, CI, DevSecOps, and automated testing
• Collaborate with Systems, Hardware and Firmware engineers
• Lead technical reviews and contribute to engineering decisions
• Mentor less experienced engineers
• Contribute to technical proposals, bids, and future product development
• Drive improvements in software tools, processes, and engineering practices

Key requirements

• Strong C/C++ experience
• Significant embedded software development experience
• Experience with bare-metal, RTOS and/or Embedded Linux
• Strong understanding of SDLC and best practices
• Experience with Object-Oriented Design and Design Patterns
• Strong testing and design-for-test experience
• Experience in complex or regulated environments
• Knowledge of Rust, TCP/IP, MISRA, DevSecOps, CI/CD, DOORS, UML, SysML or Enterprise Architect would be advantageous

• Mentoring and coaching
• Technical leadership
• Collaborative cross-functional collaboration
• C/C++
• Embedded software development
• Bare-metal/RTOS/Embedded Linux

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