Senior RF Engineer – Quantum Sensing & Test Systems

Infleqtion, Inc.; Louisville (CO); Hybrid; USD 145,000 - 170,000; Full time

Benefits offered by this job

Healthcare

HSA

Unlimited PTO

401(k) match

Life/AD&D Insurance

FSA

FMLA / Parental Leave

Employee Assistance Program

Student Loan Assistance

Equity Program

Job summary

Infleqtion, Inc. seeks an hands-on RF Engineer to establish and own the RF and electromagnetics discipline within the QRF team. You will lead the design, modeling, integration, calibration, and verification of broadband RF hardware and test environments for sensor heads and systems.

The role emphasizes RF engineering in a lab setting with close collaboration across disciplines; prior quantum experience is not required, but learning atomic physics and Rydberg sensing is expected.

Qualifications

• Bachelor's degree in electrical engineering, applied physics, electromagnetics, or a closely related technical field.
• At least five years of relevant RF, microwave, electromagnetics, antenna, or related hardware development experience.
• Experience independently designing, building, integrating, characterizing, and troubleshooting RF or microwave hardware and test systems.
• Hands‑on laboratory experience with equipment such as vector network analyzers, spectrum or vector‑signal analyzers, signal generators, oscilloscopes, power meters, and RF probes or sensors.

Responsibilities

• Own RF and electromagnetic requirements, architectures, interfaces, performance budgets, and verification methods for QRF sensor heads, test systems, and integrated hardware.
• Design, simulate, build, and characterize RF structures such as electrodes, resonators, antennas, fixtures, interconnects, shielding, and field delivery hardware.
• Develop RF signal generation, amplification, filtering, frequency conversion, local oscillator, distribution, and analog interface approaches that support broadband sensor operations
• Build and improve controlled conducted and radiated RF test environments, including field generation, field mapping, and calibration configurations.
• Define and execute measurements for field strength, frequency response, impedance, insertion and return loss, phase, coupling, shielding, noise, linearity, dynamic range, spurious response, and uncertainty.
• Build and maintain RF performance budgets for gain, loss, noise, phase noise, leakage, coupling, compression, harmonics, spurious signals, and other limits that affect sensor performance.
• Lead RF hardware bring-up, characterization, troubleshooting, and root-cause analysis across benchtop, subsystem, sensor head, and integrated system configurations.
• Use electromagnetic and circuit simulation to guide hardware and test fixture design, component selection, design trades, and interpretation of measured results; reconcile models with laboratory data.
• Develop Python or comparable automation for instrument control, parameter sweeps, calibration, regression testing, data analysis, and technical reporting.
• Work with applied physicists to relate RF field delivery and signal-chain behavior to atomic response, sensitivity, bandwidth, stability, dynamic range, and repeatability.
• Collaborate with optical-mechanical, electrical, embedded-systems, software, manufacturing, and technician personnel to define interfaces, resolve cross-domain problems, and transfer RF designs into repeatable builds and acceptance tests.
• Document designs, models, interfaces, calibration methods, test procedures, configurations, results, trade studies, risks, and recommendations for technical reviews, verification, and future production.

Skills

RF engineering

Electromagnetics

Test & measurement

Python/MATLAB

Cross-disciplinary collaboration

Education

Bachelor’s degree in electrical engineering, applied physics, electromagnetics, or related field

Tools

Vector network analyzers

Spectrum analyzers

Signal generators

Oscilloscopes

RF probes

Ansys HFSS

CST Studio Suite

Keysight ADS

Cadence AWR

COMSOL

Python

MATLAB

LabVIEW

Job description

Infleqtion, Inc. seeks an hands-on RF Engineer to establish and own the RF and electromagnetics discipline within the QRF team. You will lead the design, modeling, integration, calibration, and verification of broadband RF hardware and test environments for sensor heads and systems.

The role emphasizes RF engineering in a lab setting with close collaboration across disciplines; prior quantum experience is not required, but learning atomic physics and Rydberg sensing is expected.