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InnoPhase Inc., DBA GreenWave Radios™, is at the forefront of innovation in Open RAN digital radios. Our cutting-edge solutions, powered by the Hermes64 RF SoC, are designed to enhance network energy efficiency while dramatically reducing operational expenses, with purpose-built silicon that is the heart of ORAN-based active antenna arrays. Headquartered in San Diego, California, GreenWave Radios™ has established itself as a pioneer in delivering power-efficient digital-to-RF solutions. The company is supported by a talented team of over 100 engineers spread across four global R&D facilities. With an extensive portfolio of more than 120 global patents, GreenWave Radios™ continues to push the boundaries of radio technology and innovation. To learn more about GreenWave Radios™ and hear what our employees have to say, visit the GreenWave™ certification profile at  GreatPlacetoWork.com  or explore our  Home - GreenWave Radios website. About the Role GreenWave Radios is building the next generation of Cellular Infrastructure Radio solutions, and we're looking for a Staff Systems Design Engineer to own end-to-end system architecture for our 5G NR and O-RAN product lines. You'll translate real-world RF and protocol requirements into silicon-level specs, working at the intersection of RF, baseband, and massive MIMO — all the way from architecture to lab validation. This is a hands-on, high-impact role at a company that ships. What You'll Do Define and own system-level architecture for cellular SoCs, including link budgets, system partitioning, mMIMO beamforming chain design, and performance trade-off analysis Architect and specify O-RAN compliant subsystems — define split options (7.2x, 6, 8), fronthaul interface requirements, and RU/DU functional partitioning in coordination with protocol and firmware teams Develop and maintain detailed system specifications covering RF front-end, baseband, clocking, power, and RF/digital interfaces, serving as the authoritative reference for IC design teams Build and run system simulations (RF link, mMIMO beamforming gain, interference, EVM, sensitivity, dynamic range) to validate architecture decisions before tape-out Lead lab bring-up and characterization of prototype hardware, including hands-on use of spectrum analyzers, signal generators, VNAs, oscilloscopes, and protocol analyzers to validate RF and system performance Define test plans and acceptance criteria for system-level performance, and work closely with test engineers to implement automated measurement flows in the lab Partner with RF, analog, digital, and firmware teams to resolve cross-domain issues discovered in simulation or lab — own the path from root cause to silicon fix Drive system-level compliance verification against 3GPP 5G NR and O-RAN Alliance specifications, and represent GreenWave in standards and alliance working group discussions where applicable Produce clear architecture documents, design review materials, and technical trade-off memos that inform product and executive decisions Assist in mentoring junior systems engineers; establish best practices for system modeling, specification, and lab methodology What You Bring 8+ years of hands-on experience in cellular systems engineering (LTE, 5G NR) BS in Electrical Engineering required; MS or PhD strongly preferred Deep expertise in 5G NR system architecture — PHY layer, numerology, beamforming, and massive MIMO (mMIMO) antenna system design Experience with O-RAN architecture: functional split options, O-RU/O-DU/O-CU definitions, fronthaul (eCPRI/CPRI) specifications, and O-RAN Alliance WG4/WG7 compliance Proven lab experience — comfortable operating and interpreting data from spectrum analyzers, signal generators, VNAs, oscilloscopes, and RF test equipment in a prototype bring-up environment Hands-on experience with Cadence tools (Virtuoso, Spectre, or AWR Microwave Of