Salary: £35,000 - 55,000 per year Requirements: Proven experience designing firmware for embedded systems (ideally real-time / resource-constrained environments). Strong proficiency in C; familiarity with C++ and JAVA is desirable. Experience with a range of IDEs including Keil uVision, QT Creator, Android Studio, and source control systems including Github and TFS. Experience with embedded Linux and Android operating systems desirable. Solid understanding of hardware fundamentals and microcontroller architectures. Demonstrable experience with networking stacks and secure communication protocols. Experience with smart-card or RFID technologies is a significant advantage. Excellent analytical and debugging abilities, including use of oscilloscopes, logic analysers, and protocol tools. Ability to work autonomously and collaboratively across multidisciplinary teams. Familiarity with Mitsubishi PLCs desirable. Ability to work in the office three days per week. Authorization to work in the UK. Responsibilities: Aid in the design, development, and maintenance of embedded firmware across a range of CEM Systems hardware platforms. Work closely with hardware, software, and systems teams to deliver reliable, secure, and high-performance solutions. Design, implement and support firmware for embedded systems using RTOS-based environments. Develop/maintain/debug multi-threaded firmware applications using signals, semaphores, mailboxes, and other RTOS primitives. Create clear, robust finite state machine logic for deterministic device behaviour. Implement internal communication protocols including SPI, I2C, and other MCU subsystems. Develop and maintain embedded networking features using the ISO model, including TCP/IP, routing, and client/server operation. Integrate secure communication technologies including TLS and modern cipher suites. Implement and support smart-card reader technologies across various RFID standards. Read, interpret, and collaborate using circuit diagrams and system schematics. Conduct root-cause analysis across multi-component systems and develop solutions. Mentor junior engineers, perform code reviews, and contribute to engineering best practice. Technologies: Android Embedded Firmware GitHub Hardware Support Java Linux Qt Security TCP/IP C++ Ethernet NFC More: We are an innovative company working on industry-leading security products used worldwide. Our experienced engineering team is known for its strong technical depth, and we provide opportunities for technical leadership, architectural influence, and career progression. We offer a competitive salary, benefits, and flexible working options. This role is based in the UK and requires in-office work three days per week. last updated 10 week of 2026