Salary: £15,000 - 15,000 per year Requirements: At least 10 years of experience in designing and implementing performant software applications. Proficient in C/C++ native development. Demonstratable skills in stakeholder management including influencing, negotiating, and conflict management. Experience in line management and enabling people to perform. Extensive experience with software modelling and simulation techniques. Educated to degree level or have equivalent relevant experience. Experience with game engine technology (e.g. Unreal Engine, Godot). Familiarity with Agent, Entity, and Event-based Simulation, Robotics, and Autonomous Systems. Proficient in MS Office, especially Excel, PowerPoint, and Word. Willingness to travel and work at client sites as needed. Candidates must have an existing right to live and work in the UK. Candidates will need to undergo an internal BPSS check prior to gaining site access. Candidates will need to either hold a current SC clearance or be willing and eligible to undergo a Security Clearance check (SC level). Desirable: Experience working with Defence Digital, DE&S, Dstl, Frontline Commands, or the UK Defence industry. Responsibilities: Take responsibility for the leadership and delivery of whole, or significant sub-components, of technical consulting projects and products. Design, develop, and deliver software solutions using a large range of techniques, including Wargames, Modelling and Simulation, Robotic and Autonomous systems, Digital Twins, and Synthetic Environments. Apply mathematical and computational methods to tackle real-world problems and develop novel approaches where required. Build new relationships and maintain current customer relationships. Write proposals and coordinate bid management activity. Present technical solutions to customers and stakeholders. Author technical reports and documentation. Technologies: Excel Robotics Security Unreal GameDev C++ Hardware More: We are a small but rapidly growing consultancy owned by highly experienced and recognized practitioners in the UK defense consultancy sector. As a Principal Software Engineer, you will lead efforts in Software Modelling and Simulation, autonomy, and geospatial fields, driving innovation and advising stakeholders on new techniques. We offer competitive salaries, a generous benefits package including a 7% pension contribution, 25 days of holiday, and life insurance. Our team is dedicated to helping you grow your skills and advance rapidly within the company. last updated 5 week of 2026