Senior RF Engineer, Quantum Sensing (QRF) & Equity

Infleqtion

Louisville (KY)

On-site

USD 160,000 - 185,000

Full time

3 days ago

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Benefits offered by this job

Medical benefits

Dental benefits

Vision benefits

401(k) match

Equity program

Unlimited PTO

Life Insurance

Employee Assistance Program

Student Loan Repayment

Flexible Savings Account

Job summary

Infleqtion is seeking a hands-on Senior RF Engineer to establish and own the RF and electromagnetics discipline within the QRF team. This engineer will lead the design, modeling, integration, calibration, and verification of broadband RF hardware and test environments.

The role focuses on calibrated field generation, sensor interfaces, low-noise signal chains, RF structures, and traceable measurement; learning atomic physics and Rydberg sensing is required to ensure RF design choices translate

Qualifications

Bachelor's degree in electrical engineering, applied physics, electromagnetics, or a closely related technical field, or equivalent practical experience.
At least five years of relevant professional experience in RF, microwave, electromagnetics, antenna, advanced sensor, or related hardware development.
Demonstrated 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 at least one RF, circuit, or electromagnetic simulation environment such as Ansys HFSS, CST Studio Suite, Keysight ADS, Cadence AWR, COMSOL, FEKO, or an equivalent tool.
Experience using Python, MATLAB, LabVIEW, or a comparable environment for instrument control, test automation, modeling, or data analysis.
Ability to own the RF domain, document technical work clearly, collaborate across disciplines, and learn the atomic physics, spectroscopy, and Rydberg sensing concepts needed to connect RF design choices 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.