Rullion are looking to recruit for the following role: Electronics Engineer Start : 1st May 2026 12 month contract Location : Oxford Inside IR35 PAYE £46 Per hour /£59 Per hour Umbrella. 7.5 hours per day 37.5 hours per week Power Supply & Power Electronics Design Design and develop high-current, high-stability power supplies for superconducting magnets and related systems Design linear and switch-mode power converters (DC/DC, AC/DC, current-regulated supplies) Develop precision current regulation and control loops with excellent stability and low ripple Perform detailed control-loop analysis (Bode plots, phase margin, transient response) Design protection circuits (over-current, over-voltage, ground fault, quench-related protection) Select power semiconductors (IGBTs, MOSFETs, diodes), magnetics, and passive components Magnet System Support Support powering, ramping, and steady-state operation of superconducting magnets Understand magnet load characteristics, inductive energy storage, and fault conditions Interface with quench detection and protection systems Contribute to safe operating procedures and interlock systems Support commissioning and troubleshooting of magnet power systems Control & Digital Electronics Design control electronics for power converters (analogue and digital) Implement digital control using microcontrollers, DSPs, or FPGAs where appropriate Develop interfaces for monitoring, diagnostics, and remote control Support firmware integration and debugging in collaboration with embedded software engineers PCB Design & Hardware Integration Design schematics and oversee PCB layout for power and control electronics, preferably with Mentor Graphics experience. Apply best practices for high-current routing, creepage/clearance, grounding, and isolation Address EMC/EMI challenges associated with high-power switching systems Work closely with mechanical and thermal engineers to ensure effective cooling and packaging Prototyping, Testing & Commissioning Build, test, and debug power electronics prototypes Develop and execute test plans including load testing, thermal testing, and fault testing Use laboratory and high-power test equipment (power analysers, oscilloscopes, current probes, HV test equipment) Support system commissioning and on-site troubleshooting as required Documentation & Compliance Produce detailed design documentation, test reports, and operating manuals Support compliance with relevant standards (e.g., electrical safety, EMC) Generate BOMs and support component obsolescence management Contribute to manufacturing documentation, DFM/DFT, and supplier technical engagement Experience of IEC60601 for Medical Electronics Required Qualifications Bachelor's or Master's degree in Power Electronics, Electrical Engineering, or related field Strong experience in power supply and power converter design Proven understanding of: Current-regulated power supplies Control loop design and stability analysis High-current and high-energy systems Electrical safety and fault protection Hands-on experience with laboratory and high-power test environments Proficiency with schematic capture, PCB design, and simulation tools Desirable Skills & Experience Direct experience with superconducting magnets or accelerator/physics power systems Experience with quench protection or magnet safety systems Experience with precision, low-noise power supplies Familiarity with cryogenic environments and their electrical implications FPGA, DSP, or digital power control experience Embedded C/C++ or control firmware experience Experience in research, scientific, medical, or large-scale industrial facilities Key Competencies Strong analytical and systems-level thinking Safety-focused design mindset Ability to work with complex, high-energy systems Methodical fault-finding and root cause analysis skills Clear technical communication and documentation skills Effective collaboration with multidisciplinary teams Working Environment Hands-on engineering role involving high-power laboratory systems Close collaboration with physicists, systems engineers, and safety specialists Involvement across the full system lifecycle, including commissioning and operational support If available please submit CV and a member of the team will be in touch. Rullion celebrates and supports diversity and is committed to ensuring equal opportunities for both employees and applicants.