Senior Digital Design Engineer

**This position requires onsite in Tucson, AZ and an active Secret security Clearance. Candidates who do not hold this clearance are not eligible for hire.** Solidus is seeking a skilled and collaborative Digital Design Engineer to join our defense engineering team. In this role, you will own the full development lifecycle\-including design, analysis, simulation, test, and integration\-of critical digital electronic modules and Circuit Card Assemblies (CCAs) for missile applications. **Day in the Life:*** Architect and design complex, high\-reliability CCAs and digital electronic modules * Lead hardware through initial schematic capture, layout routing oversight, simulation, component selection, and prototype laboratory testing * Collaborate with systems, software, and test teams to integrate hardware into larger missile subsystems * Develop test plans and perform hands\-on laboratory debugging using oscilloscopes, logic analyzers, and signal generators * Generate technical design packages, worst\-case circuit analyses (WCCA), and engineering change orders * Other duties as assigned **Required Qualifications \& Experience:*** 8 years of experience with a Bachelor's or 6 years of experience with a Master's degree in Electrical Engineering, Computer Engineering, or a related STEM field * Hardware design experience (aerospace or defense industry preferred) * Strong collaborative mindset with excellent written and verbal communication skills for team\-based environments * Secret clearance * Proven experience designing digital systems embedded with microprocessors, microcontrollers, and FPGAs * Direct experience implementing and routing memory architectures such as DDR3/DDR4, Flash, and SRAM * Practical design and layout familiarity with high\-speed protocols including PCIe and Ethernet * Experience implementing board\-level communications via I2C, SPI, and UART * Proficiency with industry\-standard ECAD tools for schematic capture and PCB layout (e.g., Altium D