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 componentsMagnet 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 systemsControl & 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 engineersPCB 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 packagingPrototyping, 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 requiredDocumentation & 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 ElectronicsRequired 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 facilitiesKey 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 teamsWorking 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