Senior RF Engineer – Quantum Sensing Systems

Infleqtion; Louisville (CO); On-site; USD 160,000 - 185,000; Full time

Benefits offered by this job

Medical coverage

Vision coverage

Dental coverage

Disability insurance

Health Savings Account

Unlimited PTO

401(k) match

Life Insurance

Flexible Spending Account

FMLA leave

Employee assistance program

Student loan repayment

Equity program

Job summary

Infleqtion, a global quantum technology company, seeks a hands-on Senior RF Engineer to own the RF/electromagnetics discipline within the QRF team. You will lead design, modeling, integration, calibration, and verification of broadband RF hardware for sensor heads and test environments.

You will collaborate with physicists and engineers to connect RF behavior with atomic sensing performance, while developing automation and documentation for repeatable builds and validations.

Qualifications

• Bachelor's degree in electrical engineering, applied physics, electromagnetics, or equivalent practical experience.
• At least five years of RF, microwave, electromagnetics, antenna, advanced sensor, or related hardware development.
• 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.
• Practical knowledge of impedance matching, gain and loss, noise, dynamic range, linearity, phase noise, spurious response, leakage, coupling, shielding, grounding, and measurement uncertainty.
• Experience developing RF requirements, signal-chain budgets, test methods, calibration approaches, and quantitative acceptance criteria.
• Experience with RF simulation tools like HFSS, CST, ADS, AWR, COMSOL, FEKO, or equivalent.
• Experience with Python, MATLAB, LabVIEW for control, test, or data analysis.
• Ability to own the RF domain, document technical work clearly, collaborate across disciplines, and learn atomic physics concepts to connect RF design with quantum sensor performance.

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 design

Test automation

Cross-disciplinary collaboration

Documentation

Education

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

Tools

Ansys HFSS

CST Studio Suite

Keysight ADS

Cadence AWR

COMSOL

FEKO

Python

MATLAB

LabVIEW

Job description

Infleqtion, a global quantum technology company, seeks a hands-on Senior RF Engineer to own the RF/electromagnetics discipline within the QRF team. You will lead design, modeling, integration, calibration, and verification of broadband RF hardware for sensor heads and test environments.

You will collaborate with physicists and engineers to connect RF behavior with atomic sensing performance, while developing automation and documentation for repeatable builds and validations.