Senior Quantum RF Engineer — Cryogenic Hardware Lead

C12 Quantum Electronics; Paris; Hybrid; EUR 66,000 - 78,000; Full time

Benefits offered by this job

Stock options

Conference trips

Meal vouchers

Mental health support

Training budget

Sabbatical leave

Paris office spaces

Job summary

C12 Quantum Electronics in Paris is seeking a Senior Quantum RF Engineer to lead RF and microwave design for quantum-control hardware. You will develop low-noise signal chains from room-temperature electronics to cryogenic interconnects, and drive RF subsystem integration across packaging and test environments.

You will mentor engineers, perform simulations, optimize performance metrics, and collaborate with scientists, packaging, firmware, and suppliers to push quantum technology forward.

Qualifications

• Substantial experience designing and testing RF or microwave systems.
• Strong knowledge of S-parameters, impedance matching, transmission lines, resonators, noise, nonlinearities, and signal integrity.
• Hands-on experience with RF laboratory instrumentation and measurement techniques.
• Experience designing RF PCBs, microwave assemblies, or integrated interconnects.
• Proficiency with Python, MATLAB, or similar tools for automation and data analysis.

Responsibilities

• Design RF and microwave architectures for quantum control, readout, amplification, and signal routing.
• Develop components and subsystems including filters, amplifiers, mixers, couplers, resonators, attenuators, bias networks, and impedance-matching structures.
• Design and validate room-temperature and cryogenic RF signal chains.
• Perform electromagnetic simulation, link-budget analysis, noise analysis, and signal-integrity optimization.
• Characterize components and systems using vector network analyzers, spectrum analyzers, signal generators, oscilloscopes, and noise-measurement equipment.
• Optimize phase noise, noise figure, gain, linearity, isolation, bandwidth, cross-talk, and thermal loading.
• Develop calibration, de-embedding, and automated test procedures.
• Support integration of RF electronics with quantum processors, cryostats, interposers, PCBs, cables, connectors, and advanced packaging.
• Diagnose performance limitations involving reflections, interference, grounding, shielding, drift, and thermal effects.
• Define requirements, interfaces, test plans, and acceptance criteria for RF subsystems.
• Lead technical reviews and collaborate with quantum scientists, electronics engineers, packaging teams, firmware developers, and external suppliers.
• Mentor junior engineers and contribute to RF design standards, roadmaps, and lab practices.

Skills

RF design

Microwave systems

S-parameters

Impedance matching

Signal integrity

Laboratory instrumentation

RF PCB design

Python

MATLAB

Automation

Project leadership

Education

Master’s or PhD in electrical engineering, applied physics, quantum engineering

Tools

Ansys HFSS

CST Studio Suite

Keysight ADS

Job description

C12 Quantum Electronics in Paris is seeking a Senior Quantum RF Engineer to lead RF and microwave design for quantum-control hardware. You will develop low-noise signal chains from room-temperature electronics to cryogenic interconnects, and drive RF subsystem integration across packaging and test environments.

You will mentor engineers, perform simulations, optimize performance metrics, and collaborate with scientists, packaging, firmware, and suppliers to push quantum technology forward.