As a Senior Embedded Software Engineer, you will be responsible for the design, development, testing, and integration of embedded software for next-generation chemical and explosive trace detection products. Working within an Agile team of 4 to 6 engineers, you will collaborate closely with software and firmware engineers to deliver robust software solutions running on ARM Cortex M33 microcontrollers and FreeRTOS real-time operating systems. Your role includes interpreting UML-based architectural designs, participating in design and code reviews, debugging, and maintaining software architecture and documentation. A regular on-site presence at the Hemel Hempstead site is required to facilitate close interaction with prototype and production hardware. Security clearance (BPSS on joining and eligibility for SC clearance) is mandatory. Skills: Minimum 5 years’ experience in embedded software development Strong proficiency in C and C++ programming Experience with ARM Cortex-M microcontrollers (Armv8-M, Cortex-M4, Cortex-M33, STM32) Familiarity with embedded real-time operating systems, especially FreeRTOS (also Keil RTX, ThreadX) Knowledge of embedded system design including hardware components and interfaces Experience with communication protocols such as SPI, I2C, UART, CAN, USB Proficient in embedded debugging tools and techniques, including JTAG Experience with embedded development IDEs such as NXP MCUxpresso, Keil uVision, Freescale CodeWarrior, STM32CubeIDE Strong problem-solving skills and attention to detail Effective verbal and written communication skills Software/Tools: C, C++ FreeRTOS and other embedded RTOS MCUxpresso IDE, Keil uVision, STM32CubeIDE, Freescale CodeWarrior Jira for task and defect management UML for architectural design interpretation Certifications & Standards: BPSS clearance required on joining Eligibility to obtain SC security clearance This role demands a technically skilled engineer with a strong embedded systems background, capable of working collaboratively in a fast-paced environment while maintaining high standards of software quality and security compliance. Please send CVs to (url removed)