Electronic Engineer

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

• 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

• 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

• 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

• 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

• 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 IEC
  60601 for Medical Electronics

• 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

• 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

• 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

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