We are seeking a highly experienced Senior Systems Design Engineer, based in Brackley who has deep expertise in mixed-signal hardware design and embedded C programming. Our client is a leading designer and manufacturer specialising in prototype development and custom PCB assembly. This is a multidisciplinary role ideal for a senior engineer who thrives in a hands-on technical environment, integrating analogue and digital circuit design with real-time embedded software to deliver robust, scalable solutions. Key Responsibilities for the Senior Systems Design Engineer job based in Brackley; Lead the architecture, design, and development of mixed-signal electronic systems (analogue/digital interfaces, microcontrollers, sensors, power management). Develop and debug embedded software in C for real-time control, data acquisition, and communication tasks. Design PCBs using industry-standard tools (e.G., Altium, KiCad, OrCAD), including schematic capture, layout reviews, and BOM generation. Perform system-level integration, verification, and validation across hardware and software components. Collaborate with cross-functional teams (mechanical, firmware, software, test) to define requirements and ensure seamless system integration. Conduct design reviews, FMEA, and documentation for regulatory and manufacturing compliance (e.G., CE, EMC). Skills & Experience needed for the Senior Systems Design Engineer job based in Brackley; Degree in Electronic Engineering, Computer Engineering, or related discipline. Extensive experience in electronic system design with a strong focus on mixed-signal electronics and embedded C. Proficiency in embedded C for bare-metal or RTOS-based systems (e.G., ARM Cortex-M, STM32, MSP430, etc.). Experience designing analogue front-ends (ADC, op-amps, filters), power supplies (LDOs, switching regulators), and digital buses (I2C, SPI, UART, CAN). Strong debugging skills using tools like oscilloscopes, logic analysers, and JTAG/SWD debuggers. Solid understanding of PCB layout principles for signal integrity, EMC/EMI, and thermal considerations. Desirable: Experience with low-power embedded systems, sensor interfacing, or wireless comms (e.G., BLE, LoRa, Zigbee). To apply for this Senior Systems Deign Engineer job based in Brackley, please call Nicola King on 01582 878 839 / 07961 158788 or your CV to for a confidential discussion.