Senior / Principal Software Engineer Location: Kent (Onsite) 4 days per week. Salary: Up to 65,000 depending on experience Due to the nature of the work, applicants are required to obtain security clearance and must be a sole British national. Copello is working with a leading engineering, and technology organisation is seeking Senior / Principal Software Engineer to join its growing team developing advanced, safety-critical systems. This is an opportunity to work on highly complex products within a regulated environment, contributing to the design, development and delivery of cutting-edge software solutions used in mission-critical applications. You''ll play a key role in shaping software architectures, solving complex technical challenges and supporting projects throughout the full engineering lifecycle. Key Responsibilities Lead the design and development of embedded software solutions for complex systems. Define software and system architectures from requirements using structured design methodologies. Support integration, verification and validation activities within a safety-critical environment. Participate in design reviews, technical decision-making and continuous improvement initiatives. Engage with customers and stakeholders to understand requirements and resolve technical challenges. Contribute to the successful delivery of high-quality, compliant engineering solutions. About You A degree or equivalent qualification in Software Engineering, Electronics En