The RoleWe are looking for an RF Test & Systems Engineer to own the testing, characterization, and system-level validation of our mmWave beamforming chips and phased array platforms. This role sits at the intersection of RF testing, systems design, and applications engineering-you will prove our silicon works, build the systems around it, and help customers integrate it.
Responsibilities- Design, execute, and automate RF bench-top and over-the-air test plans for custom RFIC chipsets and phased array antennas. Own chip-level and system-level characterization.
- Architect and build phased array evaluation systems-PCB design, antenna integration, packaging interfaces, RF signal chain assembly.
- Perform EM simulation of phased arrays, RF passives, chip packages, PCBs, and antennas using Ansys HFSS and ADS Momentum. System-level signal chain modeling using MATLAB, Python, or Keysight SystemVue.
- Develop evaluation kits, reference designs, and technical documentation. Support customer design-in activities.
- Build and maintain RF test infrastructure including automation scripts (Python), calibration procedures, and measurement workflows.
- Work with RFIC designers, founding team, and customers to translate test results into design feedback.
Required Qualifications- 5+ years in RF/mmWave testing, system design, or applications engineering.
- Proficient with RF test equipment: VNAs, spectrum analyzers, signal generators, power meters, and over-the-air test setups.
- Experience automating test equipment using Python and building repeatable measurement workflows.
- Experience in high-frequency (>6 GHz) phased array antenna PCB design, layout, and testing using Altium.
- Comfortable with EM simulation tools (Ansys HFSS, ADS Momentum) for antenna and package analysis.
- Strong understanding of RF front-end circuit blocks and theory.
- Advanced degree (MS/PhD) in EE or significant industry experience.
Preferred Qualifications- Theoretical expertise in multi-antenna wireless systems and phased array beamforming.
- System-level signal chain modeling (MATLAB, Python, Keysight SystemVue).
- Prior FAE or customer-facing technical role at a semiconductor company.
- Experience developing evaluation boards, reference designs, or customer hardware.
- Familiarity with chip packaging and its impact on RF performance at mmWave.
- Self-directed: takes ownership, builds what's needed, doesn't wait to be told.
Why Oso- Full ownership: Own the test and validation pipeline for a first-of-its-kind mmWave beamforming platform.
- Bridge role: Your work directly determines how our technology gets adopted by customers.
- Meaningful equity: Competitive stock option grant with real upside.
- UC Berkeley DNA: Work alongside PhDs with deep domain expertise.
- Dual-market: Defense (SATCOM, radar) and commercial (5G).
What We Offer- Equity: Stock option grant with 4-year vesting and 1-year cliff.
- Medical, Dental & Vision: Comprehensive health coverage with employer-sponsored medical, dental, and vision plans.
- Hybrid Schedule: Monday-Wednesday in office.
- Time Off: Unlimited PTO.
- 401(k): Employer-matched retirement plan.
- Team Culture: Regular team lunches, events, and celebrations.
- Life Insurance: Company-paid life insurance.
- FSA & HSA: Flexible spending and health savings account options available.
- Commuter Benefits: Pre-tax transit and parking benefits.
