Join a world leader in missile and missile systems, trusted by the UK Ministry of Defence. We are seeking highly capable and adaptable engineers to develop safety-critical, real-time application software for next-generation missile systems. This hands-on role covers the full software development lifecycle within our advanced Development Facility in Stevenage, Hertfordshire. Key Responsibilities: Deliver on-board software for next-generation missile systems. Take a hands-on role in the full development lifecycle. Architect, design, implement, and test missile subsystem software. Ensure compliance with required standards and processes throughout development. What do you need?: Essential (Good) Author specifications across the full lifecycle, including planning, design, and test documentation. Experience with formal requirements capture tools. Strong background in requirements analysis. Knowledge of source configuration control processes (e.g., PVCS, RTC, GIT). Excellent attention to detail. Ability to work independently with minimal supervision. Skilled in debugging complex problems and producing documentation to meet safety standards. Extensive experience developing bare-metal embedded software using C/C++. Collaborative approach to working within multi-disciplinary teams (e.g., Systems, Integration, Electronics). Required (Better) Proven experience in developing and verifying embedded software to high safety integrity levels (e.g., DO178C Level B, SIL-4, or equivalent). Expertise in specification and requirements creation, with compliance tracking in DOORS. Working knowledge of C/C++ for testing special builds and conducting focused code reviews. Proficiency in unit testing using tools such as LDRA, RAPITA, or equivalent. Understanding of code coverage techniques and strategies for addressing shortfalls. Hands-on experience in a lab environment with live equipment (PSUs, oscilloscopes, logic analysers) for system testing. Desirable (Best) Significant experience developing software to DO178C Level B standards. Familiarity with defence standards and microcontroller technologies. Experience testing on development cards in a test environment or bare-metal using special builds. Proficiency with RAPITA Systems Tool Suite. Knowledge of modelling tools and Ansys SCADE Tool Suite. Experience with ALM platforms such as JIRA or IBM Engineering Workflow Manager. Ability to create and manage virtual machines (e.g., VMware). What happens now? Upon submission of your application, should it meet our selection criteria, you will be contacted via e-mail by one of our talent acquisition specialists to arrange a screening call. This telephone chat is structured to explore a series of questions aimed at matching your competencies and capabilities to the specific demands of the position. Please note, this screening is contingent upon the initial success of your application. Security Clearance : British Citizen or a Dual UK national with British citizenship Restrictions and/or limitations relating to nationality and/or rights to work may apply. As a minimum and after offer stage, all successful candidates will need to undergo HMG Basic Personnel Security Standard checks (BPSS), which are managed by our clients Security Team. More about the role: For more than 70 years, our client has been in a strong partnership with the UK military. They have accomplished numerous milestones in defence engineering and have provided essential defence capabilities to meet the requirements of the armed forces across land, sea, and air. This role is based at our client's headquarters in Stevenage, a key location for missile operations. The site offers excellent transportation links, an onsite gym, and a coffee shop. Training and development opportunities are available to all employees.