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 Engineering, Physics, Mathematics or a related discipline. * Strong commercial experience developing software in C and/or C++. * Experience designing software architectures using UML or other model-based design techniques. * Familiarity with tools such as CAMEO, Enterprise Architect, Rhapsody or similar modelling environments. * Experience developing software that interfaces with hardware in real-time or embedded environments. * Knowledge of safety-critical development standards and regulated engineering processes