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Infleqtion is a global quantum technology company solving the world’s most challenging problems. The company harnesses quantum mechanics to build and integrate quantum computers, sensors, and networks. From fundamental physics to leading edge commercial products, Infleqtion enables “quantum everywhere” through our ecosystem of devices and platforms.  POSITION SUMMARY  This role focuses on RF architecture design, electromagnetic structures, and EM measurement/calibration in support of advanced quantum and atomic sensor systems. The engineer will serve as a senior technical contributor responsible for developing RF test environments, designing and characterizing EM structures, contributing to LO and signal-chain architecture, and translating experimental results into clear technical direction and measurable system performance. Much of the test and characterization work is in the RF and microwave regime, while familiarity with lower-frequency design and components is also valuable.  This is a fully onsite role based in Boulder or Louisville, Colorado. The position emphasizes technical ownership, cross-functional coordination, and clear communication of progress and risk to leadership. Prior experience with atomic or quantum sensors is helpful but not required.  JOB RESPONSIBILITIES   The duties and responsibilities outlined below include essential functions of the role. Depending on business needs, this role may perform a combination of some or all of the following duties. Duties, responsibilities, and activities may change, or new ones may be assigned at any time with or without notice.  Own simulation, design, build, and characterization of electrodes and other RF/EM structures supporting sensor and test system development  Develop free-space RF testbeds and controlled RF environments, including requirements definition, design support, build-out, validation, and continuous improvement  Define and execute EM measurement and calibration methods for radiated field strength, coupling, shielding, and measurement uncertainty  Develop calibration and measurement approaches for controlled-source and signal-of-opportunity field characterization  Contribute to RF architecture development across low-frequency through microwave operation, including signal-chain partitioning and interface definition  Contribute to local oscillator architecture, generation, and distribution approaches for lower- and higher-frequency operation  Evaluate LO leakage, spurious responses, phase noise, and coupling paths, and recommend mitigations  Build and maintain LO noise, signal-chain, and system-level link budgets to support design trades and performance analysis  Support development of frequency conversion and analog interface approaches, including baseband-to-IF concepts as needed  Lead EM simulations to guide hardware design, measurement setup design, and interpretation of test results  Define RF performance metrics and comparison frameworks that support clear datasheet-style communication for novel sensing capabilities  Assist in the design and execution of directionality characterization experiments and related validation plans  Specify requirements for internal or external RF test environments and coordinate with vendors or subcontractors as needed  Collaborate with physicists, electrical engineers, mechanical engineers, software engineers, and external partners to integrate technical contributions  Develop automation, instrument control, data processing, and reporting workflows for RF/EM test activities  Execute hardware bring-up, calibration, troubleshooting, and root-cause analysis across prototype and integrated systems  Document designs, test methods, calibration procedures, and results to support technical reviews and future development