RF Engineer

Planckian is developing the core technology to power utility-scale quantum computers.

By design, our chip architecture decouples control lines from qubit count, removing a key bottleneck in scaling. It combines the proven reliability of superconducting circuits with a breakthrough approach to qubit control, paving the way for quantum computers capable of solving the world’s most challenging problems.

We are seeking a RF engineer to join our hardware team.

What You'll be doing

• Ensure correct installation, operations and maintenance of dilution refrigerators, including base temperature performance, cooling power, and thermalization at each stage

• Own the full RF/microwave signal chain — attenuators, isolators, circulators, HEMT and TWPA amplifiers, and filtering — optimizing for minimum noise and maximum qubit coherence

• Design and implement shielding and filtering solutions: magnetic shielding, infrared blocking, EMI mitigation, and thermal anchoring across all temperature stages

• Benchmark the system with superconducting qubits in collaboration with the measurement team, iterating on wiring and shielding configuration to maximize T1 and T2

• Coordinate facilities requirements (vibration isolation, EMI environment, cooling, gas handling) and establish standard operating procedures for the lab

Requirements

• PhD in Physics, Electrical Engineering, Applied Physics, or a closely related field, or equivalent industry experience

• Demonstrated hands-on experience installing and commissioning dilution refrigerator systems for qubit measurement

• Deep working knowledge of RF and microwave engineering in the 1–20 GHz range, including signal chain design, calibration, and noise analysis

• Familiarity with cryogenic components and best practices: attenuator and filter selection, thermal anchoring, magnetic shielding, low-noise amplifier integration

• Experience with superconducting qubit measurement: dispersive readout, single-shot readout

• Experience setting up a quantum measurement lab from scratch, including facilities planning

• Experience with parametric amplifiers (TWPAs, JPAs) and quantum-limited measurement

• Experience with PCB and sample holder design for microwave packaging of qubit chips

Every job has its challenges, and this one is no exception. While many companies gloss over them, we believe in being upfront:

• You’ll face tough situations, especially the classic challenge: people problems. Navigating human dynamics can be tricky and requires patience and empathy.

• Some work is unglamorous, but building a great company means rolling up your sleeves. From strategic decisions to hands-on grunt work, everyone contributes to the heavy lifting.

We're not looking for perfection; we're looking for people who are ready to grow through the hard parts and help us build something that lasts.

What We Offer

• Competitive salary + benefits

• Stock options

• Flexible working hours with hybrid working

• Ego-free, merit-based environment

Planckian is an equal-opportunity employer