Salary: £40,000 - 70,000 per year Requirements: Demonstrable experience in the application of Systems Engineering for software-based products. Expertise in Systems Engineering and Software integration lifecycle principles (ISO 15288 and 12207). Strong background in requirements management (experience with IBM DOORS Next is desirable). Familiarity with engineering lifecycle models (Waterfall & Agile) and tools (e.g., JIRA). Background in software development and integration. Technical leadership skills with the ability to guide teams across disciplines to shape design solutions. Responsibilities: Provide hands-on technical leadership with a team of systems and software engineers, directly supporting the product System Design Authority. Apply the principles of Systems Engineering to develop software-based Simulation Systems across the full engineering lifecycle. Undertake design activities related to Simulation Systems equipment, network design, and software design. Lead requirement decomposition and manage specifications using tools like IBM DOORS Next. Direct architectural modelling and interface definitions in tools such as CATIA Magic (Cameo). Drive system integration and define acceptance strategies for software-based systems. Lead technical reviews and ensure compliance with customer, legislative, and business requirements. Technologies: IBM JIRA Network Support More: We are a multinational Aerospace & Defence organization seeking a Principal Systems Engineer to join our Simulation and Training sector in Portsmouth on a hybrid basis. You will be part of the Maritime and Land Defence Solutions business, working on the MIMESIS product. As the System Technical Lead within the MIMESIS team, you will have technical responsibility for the design and development of new modules/content for the product, reviewing and approving lower-level documentation while providing technical guidance to the engineering team in close collaboration with the System Design Authority. We offer a competitive salary along with a bonus of 10-20%. last updated 8 week of 2026