We re hiring a Principal Software Engineer to join a global technology business based in Buckinghamshire. The company designs and builds high-precision laboratory instruments used in science, healthcare, and environmental testing Please note: NO SPONSORSHIP IS PROVIDED WITH THIS POSITION What You ll Do as a Principal Software Engineer: Lead the design and architecture of software systems across the full stack, from embedded C/C++ firmware controlling hardware to high-level C#/.NET applications. Mentor and guide a multidisciplinary team of software, firmware, and electronics engineers. Apply physics-based thinking to develop algorithms that turn raw sensor data into meaningful scientific results. Work closely with hardware teams to bring up new boards, debug complex opto-electronic systems, and integrate hardware with software seamlessly. Drive innovation in next-generation products, particularly in areas like thermal analysis and materials characterisation. Support manufacturing and production while collaborating cross-functionally on high-level software development. Requirement for a Principal Software Engineer: Degree in Physics, Mathematics, or Engineering with a strong physics component. 10+ years of commercial software experience with a proven track record of delivering complex systems. Expert-level skills in C#/.NET and strong experience in C/C++ for embedded systems/firmware. Experience leading or mentoring multidisciplinary technical teams. B