# RF Engineer II (R6053) **Company**: Shield AI **Location**: Seattle, Washington **Work arrangement**: onsite **Experience**: mid **Job type**: Full Time Employee **Salary**: USD 110,000-170,000 per-year-salary **Category**: Engineering **Industry**: Technology **Apply**: https://jobs.lever.co/shieldai/1b993ea7-fe14-4c41-937e-b42876f42418?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply **Canonical**: https://yubhub.co/jobs/job_523c7ae6-213 ## Description Shield AI develops intelligent autonomous systems that protect service members and civilians. The X-BAT Engineering team is building a next-generation autonomous aircraft for demanding and contested environments. You will design and deliver compact, high-performance RF modules for airborne and ground systems. Your focus will be on hands-on module design, including active and passive RF circuits, PCB assemblies, packaging interfaces, laboratory verification, and transition to production. ## Responsibilities: - Design RF and microwave modules from requirements and architecture through schematic capture, component selection, layout, bring-up, verification, qualification, and production release. - Design active and passive RF circuits such as low-noise amplifiers, power amplifiers, filters and multiplexers, RF switches, limiters, couplers, attenuators, power detectors, and frequency-conversion stages. - Develop RF front-end assemblies that meet gain, noise figure, output power, linearity, compression, efficiency, harmonic and spurious-emission, stability, isolation, and out-of-band rejection requirements. - Perform circuit and electromagnetic analysis using tools such as Keysight ADS, Cadence AWR, HFSS, or CST, and correlate models with measured hardware performance. - Create and review RF and mixed-signal PCB designs, including controlled-impedance routing, grounding, shielding, stack-up definition, power distribution, and placement of sensitive or high-power components. - Plan and execute laboratory characterization using network analyzers, spectrum analyzers, signal generators, noise-figure analyzers, power meters, oscilloscopes, and automated test equipment. - Diagnose difficult hardware issues involving instability, oscillation, intermodulation, self-interference, desense, thermal drift, mismatch, leakage, and electromagnetic coupling. - Work closely with mechanical, thermal, avionics, communications, antenna, manufacturing, and test engineers to integrate RF hardware into size-, weight-, power-, cooling-, and environmental constraints. - Develop verification methods, production test strategies, calibration approaches, and clear technical documentation that make designs repeatable and manufacturable. - Support environmental and electromagnetic qualification, supplier engagements, hardware integration, ground test, and flight test as needed. - Contribute to design reviews, share technical knowledge, and support the growth of interns and less-experienced engineers. ## Requirements: - Bachelor's degree in Electrical Engineering, Applied Physics, or a related field, or equivalent practical experience. - Typically 1 or more years of relevant post-undergraduate experience for L2. - Hands-on experience designing, building, or debugging an RF or microwave circuit, module, or PCB assembly through measured verification. - Solid understanding of S-parameters, impedance matching, transmission lines, stability, gain and noise figure, linearity and compression, nonlinear products, isolation, and cascaded RF performance. - Experience creating or reviewing RF PCB layouts with controlled impedance, grounding, shielding, component placement, and signal-integrity considerations. - Proficiency with common RF laboratory instruments and calibration methods. - Ability to use simulation and measured data to make sound design decisions. - Clear written and verbal communication skills and the ability to work effectively with cross-functional engineering and manufacturing teams. - Ability to work on-site in a laboratory and hardware-development environment. ## Preferred Qualifications: - Experience with RF front ends for airborne, defense, space, robotics, or other high-reliability systems. - Experience integrating GaN or GaAs power amplifiers, MMICs, LNAs, switches, limiters, frequency converters, or high-selectivity filter technologies. - Experience designing for simultaneous transmit and receive operation, high-power RF, intermodulation control, adjacent-band rejection, or co-site interference and desense. - Experience with Altium Designer and one or more RF or electromagnetic simulation environments such as ADS, AWR, HFSS, or CST. - Working knowledge of thermal design, RF packaging, connector and cable interfaces, tolerance analysis, and design for manufacturability and test. - Experience with EMI and EMC design and qualification for military or aerospace hardware. - Experience developing automated characterization or data-analysis tools in Python, MATLAB, or a similar environment. - Experience transitioning RF hardware from prototype through qualification and low-rate production. - Ability to obtain an S//SAR level security clearance, if required by the program. ## Skills ### Required - RF and microwave circuit design - PCB assembly design - Electromagnetic analysis - Keysight ADS - Cadence AWR - HFSS - CST - Altium Designer - Python - MATLAB ### Nice to have - RF front end design - GaN or GaAs power amplifiers - MMICs - LNAs - switches - limiters - frequency converters - high-selectivity filter technologies - EMI and EMC design - automated characterization tools --- Source: [Apply at jobs.lever.co](https://jobs.lever.co/shieldai/1b993ea7-fe14-4c41-937e-b42876f42418?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply)