Job Title: Senior/Principal Software Engineer Job Location: Rochester, Kent. Onsite Salary: Up to £65.000 per annum depending on experience Who we are: Join BAE Systems and you''ll be part of something bigger. As a valued member of our global colleague network, you''ll bring your unique skills and perspectives to help pioneer progress and protect what matters most. You''ll be trusted to play your part in delivering the advanced, technology-led defence, aerospace and security solutions of tomorrow - shaping a safer future, for all of us. Role Description: As a Principal Software Engineer, you will lead the design and delivery of embedded software for complex , safety critical systems. You will develop drivers, protocols and human-machine interfaces. Responsible for technical direction and ensuring robust, certifiable solutions. Working across the full lifecycle, you will define architectures and solve complex engineering challenges through integration, verification and validation. You will provide technical leadership , mentor engineers and influence best practice. Engaging with customers and stakeholders, you will shape strategy, drive innovation and play a key role in delivering high-impact solutions. Core Duties: Lead design and development of embedded software, including drivers, protocols, human-machine interfaces with certification artefacts Define system and software architectures from requirements using structured design, modelling and simulation Drive integration,