Software Engineer / Test Specialist (SDET, Safety Critical)Oxford (Hybrid, 2 days onsite per week)Highly competitive salary, open and negotiableAbout the RoleWe are looking for a Software Engineer / Test Specialist with strong experience in safety critical systems, focused on DO-178C and Verification and Validation (VandV).This is an opportunity to join an extremely well funded and well backed startup with a clear ambition to become a leading technology player in its field. The organisation is building next generation, AI led software systems where safety, reliability and certification are critical to success.You will play a key role in ensuring that advanced, AI-enabled software meets rigorous safety standards, combining traditional SDET responsibilities with deep involvement in safety assurance and certification activities.Key ResponsibilitiesLead and support VandV activities aligned with DO-178C objectivesDevelop and execute test strategies, test plans and certification artefactsValidate and assure AI driven and software intensive systems within safety critical frameworksDesign and implement automated and manual testing approaches for complex, high integrity softwareProduce and review compliance documentation such as Software Verification Plans, test cases and verification reportsWork closely with software, systems and AI/ML teams to ensure certification readinessCarry out requirements based testing and maintain full traceability using tools such as DOORS or PolarionSuppor