Mechanical Engineer III

Mercury Systems is seeking the best and brightest engineering talent to help us deliver cutting‑edge technology for mission‑critical aerospace and defense applications, advancing innovation where it matters most.

In this role, our team is looking for a dynamic senior mechanical engineer who brings technical experience and a fresh perspective to complex design challenges.

You will play a hands‑on role in designing, analyzing, and testing rugged subsystems, subsystems, and complex PCB assemblies that are core to Mercury’s high‑performance product portfolio.

The ideal candidate thrives in a fast‑paced, multidisciplinary environment and is driven to translate innovative ideas into impactful, mission‑ready solutions.

• Lead products through the full lifecycle; from concept development to integration, testing, and production release.
• Perform mechanical engineering activities for rugged subsystems and complex PCB assemblies, including mechanical packaging, connector selection, cable and label design, prototype inspection and assembly, environmental testing, and supporting hardware documentation procurement
• Collaborate closely with cross‑functional partners such as Hardware/Electrical Engineering, Manufacturing, Quality Engineering, and Procurement
• Develop and maintain Bills of Material (BOMs/PLs) to support accurate configuration and production control
• Draft, submit, and manage Engineering Change Requests (ECRs) and Engineering Change Orders (ECOs)
• Conceptualize, design, analyze, and document mechanical hardware and systems intended for rugged military and space environments
• Conduct thermal and structural analysis and/or simulations to ensure robust mechanical and environmental performance
• Design complex fixtures to support product testing and advanced manufacturing processes
• Create detailed 3D models and engineering drawings
• Communicate design concepts and produce clear, high‑quality product documentation for diverse internal and external audiences
• Support environmental and functional design verification testing in accordance with MIL‑STD‑810 for severe operating conditions