Senior Systems EngineerLocation: Bristol (20% onsite / 80% remote) Duration: Initial 6-month contract with strong extension potential Rate: 60- 65 per hour (Inside IR35) Security Clearance: Active SC Clearance requiredThe OpportunityWe are seeking an experienced Senior Systems Engineer to support the development of complex defence and aerospace capabilities. This role offers the opportunity to work across the full systems engineering lifecycle, helping to shape future operational solutions through requirements engineering, systems architecture, and Model-Based Systems Engineering (MBSE) approaches. Working within a collaborative, multidisciplinary environment, you will engage with a wide range of stakeholders to understand operational needs, develop robust system architectures, and ensure requirements are effectively managed and traced throughout the engineering lifecycle.Key ResponsibilitiesCapture, analyse and refine stakeholder needs into clear, structured requirements.Apply Model-Based Systems Engineering (MBSE) techniques to develop system and service architectures.Develop use cases, operational scenarios and functional models to support requirements definition and validation.Manage requirements and maintain end-to-end traceability across the engineering lifecycle.Conduct functional analysis and support architectural decision-making activities.Perform trade studies and option assessments to balance operational, technical and programme constraints.Contribute to system-of-