RF Test Engineer

The Jacksonville RF/cryo lab is where superconducting devices stop being theoretical and start producing data. Vector network analyzers, cryogenic probers, dilution refrigerators, and the microwave signal chain that ties them together — all of it has to run, stay calibrated, and produce measurements other teams can actually build decisions on. This role owns that.

You will run day-to-day RF and microwave measurements on superconducting device samples, maintain the instrumentation that makes those measurements possible, and serve as the on-the-ground RF authority for a physics team that mostly works remote.

You will work directly with device physicists, fab engineers, and the rest of the test group in a flat, matrixed organization.

There are no layers between you and the problem — and no one to fall back on when an instrument drifts at 2am.

In twelve months, the calibration discipline, measurement protocols, and equipment logs you set up should be the reason the rest of the company trusts the data coming out of this lab.

As the program scales, this is the seat that trains the next bench engineers — including anyone we bring on for specialized SQUID microscopy work.

• - Own day-to-day operation of the Jacksonville RF/cryo test lab — instruments running, fridges loaded, samples measured, data captured.
• - Execute high-precision RF and microwave measurements on superconducting device samples, including S-parameter, noise, and time-domain characterization at cryogenic temperatures.
• - Maintain the instrumentation that keeps those measurements honest: VNAs, cryogenic probers, microwave components, cabling, connectors, and the cold-chain signal path end to end.
• - Define and hold the line on calibration schedules, cable management, fixturing standards, and equipment logs — the unglamorous discipline that separates trustworthy data from noise.
• - Support scanning SQUID microscopy measurement campaigns when required, and own the training pipeline that brings junior staff up on SSM technique as the program scales.
• - Capture, document, and hand off test data to the remote physics team in a form they can actually reason from — including the context, conditions, and caveats that make the numbers meaningful.
• - Drive root-cause investigation when measurements disagree with theory or with each other — fixture, calibration, sample, or physics, you figure out which.
• - Partner with device physicists, fab engineers, and other test staff to keep measurement methodology and process feedback loops tight.

• - Direct, hands-on experience running RF and microwave lab equipment in a measurement-intensive environment — bench time, not just simulation, EDA, or design work.
• - Working experience in cryogenic test environments — dilution refrigerators, pulse tubes, cryogenic probers, or equivalent — including the practical realities of thermal anchoring, cold-chain signal integrity, and what breaks at low temperature.
• - Deep, practical fluency with precision S-parameter, noise, and time-domain measurements: calibration choices, error budgets, fixturing, and the places those assumptions quietly fail.
• - Discipline around the operational side of a lab — calibration cadences, cable and connector hygiene, equipment logs, and the kind of documentation that lets the next person reproduce what you did.
• - Track record of running equipment independently and keeping it running without on-site senior supervision.
• - Comfort operating in a startup environment where priorities shift, procedures are still being written, and "we don't have one yet" is a frequent answer.

• - Direct experience with scanning SQUID microscopy — or substantive exposure to programs that ran it. This is a rare skill…