Electrical Engineer — Analog & Low-Noise Hardware

In most analog roles, you own a block. Here, you own the front end of a system nobody has built before.

Prex Technologies is recruiting on behalf of a confidential client: an early-stage deep-tech startup building a new non-invasive medical neurotechnology.

The signals are microvolts. The band is hundreds of kHz to low MHz. Everything downstream (the algorithms, the product, the company) depends on how clean the data is when it leaves your board. You'll own that board.

Bay Area, CA · On-site · Full-time

$150K–$200K base + equity · Visa sponsorship available

WHAT YOU'LL DO

• Design low-noise front ends for microvolt-level differential signals: input protection, biasing, first-stage gain, filtering, ADC drive, low-noise power and isolation.

• Write the noise budget, then prove it on the bench, near the instrument noise floor.

• Take boards from schematic to layout, fab, bring-up and the next revision, with your own hands.

• Own the receive-chain architecture: direct sampling vs. analog demodulation, gain distribution, ADC and clock choices.

• Get data flowing end to end, from the sensor input to timestamped I/Q on a PC, and write the Python reference for demodulation and decimation.

• Be the technical owner with board vendors, overseas partners and FPGA contractors.

• Build the lab: choose the instruments, fixtures and shielded setups the work needs.

YOUR FIRST 90 DAYS

• Reproduce the current prototype and publish a measured noise budget.

• Set up the bench: shielded setup, calibrated µV injection, capture scripts.

• Write the architecture memo: direct sampling vs. analog demodulation.

• Ship one board revision that measurably beats the last one.

YOU'LL FIT IF YOU HAVE

• 3+ years of hands-on analog/mixed-signal work with low-noise front ends at the core: instrumentation, precision DAQ, RF receivers, medical AFE or similar.

• Boards you took personally from schematic to validated performance, across more than one prototype generation.

• Deep low-noise design skills: noise vs. source impedance, input capacitance, CMRR at frequency, grounding, shielding and layout.

• Strong bench practice with scopes, spectrum analyzers, lock-ins and signal generators, and the instinct to tell a real signal from a setup artifact.

• Measurement DSP (sampling, I/Q, filtering, decimation) and Python to analyze your own data.

BIG PLUS

• FPGA or real-time DSP: NCO mixing, CIC/FIR decimation on Zynq-class parts, JESD204B. Bring this and you own the digital side too.

• A full acquisition chain you built yourself: ADC → FPGA/MCU → Ethernet/USB3 streaming, with timestamps and trigger sync.

• Biopotential or bioimpedance front ends, lock-in or SDR work, IEC 60601 or ISO 13485.

WHY THIS ONE

• Founding team: you work directly with the founders, lead your own domain, and decisions happen fast.

• Research to product: the work starts as something nobody has done and has to end as a reliable device.

• A lab that's yours to build: you decide what goes on the bench.

• Equity, and visa sponsorship if you need it.

WHO THRIVES HERE

Builders who show their work rather than describe it, and who like owning a whole system with little structure around them. If you want a defined lane or big-company process, this isn't it.