Principal Software EngineerWe are seeking an experienced Principal Software Engineer to lead the development of advanced scientific instrumentation within a multidisciplinary R&D environment.This is a hands-on technical leadership role requiring deep expertise in software architecture, embedded systems, and a strong foundation in physics. You will translate physical principles and user requirements into robust, production-ready systems spanning firmware, hardware integration, and high-level applications.Key ResponsibilitiesLead architecture across embedded firmware (C/C++) and application software (C#/.NET).Provide technical leadership and mentorship to Software, Firmware, and Electronics Engineers.Develop physics-based algorithms for signal processing, instrument control, and data interpretation.Integrate software with complex opto-electronic and hardware systems.Define development standards, drive Agile practices, and implement CI/CD pipelines.Contribute to next-generation product innovation in thermal analysis and materials characterisation.RequirementsHonours degree in Physics, Mathematics, or Engineering (with strong Physics basis).10+ years’ commercial software development experience.Expert in C#/.NET; strong C/C++ for embedded systems.Experience with hardware communication protocols (I2C, SPI, USB, Ethernet).Proven leadership within multidisciplinary engineering teams.Background in scientific instrumentation, industrial automation, or similar hardware-integrated environments.DesirableSignal processing (FFT, digital filtering) or image processingMATLAB or Python for prototypingCloud/IoT connectivity (Azure/AWS)Experience leading multi-discipline teamsThis is a high-impact role for a technically strong leader with a “first principles” mindset who can bridge physics and software to deliver innovative, market-leading products.Principal Software Engineer, Software Architecture, Embedded Systems, Firmware, C#, C/C++, Physics-Based Algorithms, Signal Processing, Opto-Electronics, Instrument Control, R&D, Multidisciplinary Team, Technical Leadership, Scientific Instrumentation, Industrial Automation, Hardware Integration, CI/CD, Agile, MATLAB, Python, IoT, Cloud Connectivity, Thermal Analysis, Materials Characterisation, Electronics Engineering, Mentorship, High-Level Applications, High Wycombe, Oxford, Swinton, Reading, Slough, London, VRS9380MP.