Lead R&D Technician

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus and technical excellence are decisive advantages - and we are building a team that can deliver real capability, not just concepts.

This is a rare opportunity to join at an early stage, where your work will directly shape critical systems, influence major technical decisions, and have immediate, real-world impact.

Castelion is seeking a detail-oriented and highly motivated Lead R&D Technician to join our manufacturing team. In this role, you will support the design, setup, execution, and documentation of tests on hypersonic missile components and systems during the development phase. You will work closely with design and manufacturing engineering teams to ensure products meet rigorous performance, reliability, and safety standards.

• Lead a team of technicians responsible for fabrication, assembly, and modification of test articles (precision drilling, bonding, harnessing)
• Supervise assembly and configuration of test fixtures, instrumentation, and equipment for development tests (mechanical and fluid assemblies, data and control systems.)
• Participate in hazardous test operations - including configuration, execution, troubleshooting and monitoring/data recording.
• Accurately capture and log test data using appropriate software and hardware tools.
• Perform initial data reviews to identify anomalies or deviations from expected results.
• Provide test data summaries and reports to engineering teams.
• Maintain, calibrate, configure, monitor, test, troubleshoot, install, and repair instrumentation, process controls, data acquisition systems, and electrical systems
• Perform routine maintenance on test setups and ensure compliance with calibration standards.
• Collaborate with engineers to refine test plans and procedures.
• Maintain detailed and accurate test logs, records, and documentation for traceability and audits.
• Support root cause analysis and continuous improvement efforts.

• High school diploma or equivalency certificate
• 5+ years of hands on mechanical experience in one or more of the following: testing of aerospace/automotive systems, maintenance/troubleshooting complex mechanical systems, and/or fabrication/assembly of complex electromechanical systems.

• Associate degree in engineering, mechanical, electrical systems, or other related field
• Experience reading/interpreting planning documents, schematics, wiring diagrams, specifications, drawings, manuals, blueprints, and engineering sketches
• Experience with precision measuring instruments/equipment
• Experience with aerospace or military-grade harness fabrication
• Knowledge of data acquisition and controls concepts, hardware, and interfacing (National Instruments PXI / cSeries and PLC)
• Experience with analog and digital instrumentation (load cells, pressure transducers, strain gauges, encoders, deflection gauges, and accelerometers)
• Experience with rigging, cranes, and lift operations
• Employee Equity:
  Meaningful equity for all full-time employees - share value has increased 150x in three years
• Personal Time Off:
  Four (4) weeks of paid time off to unplug, reset, and come back sharp—velocity matters, burnout doesn’t
• Medical:
  We offer plans at 100% employee covered and 80% of dependent coverage
• Dental & Vision:
  We cover 90% employees and 80% for dependents to ensure you and your family have access to quality preventive and ongoing care
• FSA/HSA:
  To support long-term health and financial resilience, we offer FSA and HSA options that allow employees to set aside pre-tax dollars for eligible medical and dependent care expenses
• Retirement: 401k plan offered to support long term financial growth alongside high-impact, high-velocity work
• Paid Parental Leave:
  We support growing families with meaningful time to bond and recover. Birthing parents are eligible for up to 10 weeks of paid leave, while non-birthing parents may take up to 4 weeks of paid leave. This time can be used for pre-natal care, pregnancy, childbirth, and related medical needs—ensuring every parent has the…