Mechanical Assembly Lead

Castelion Corporation•Torrance, CA
•Onsite

About The Position

Castelion is seeking a Mechanical Assembly Lead to perform hands-on assembly and integration of advanced aerospace and defense hardware at its Torrance, California facility. This full-time role guides technicians and assemblers through complex mechanical builds, ensures work is performed safely and in accordance with drawings and procedures, and collaborates with engineering, manufacturing, quality, and operations to deliver hardware on schedule. The role is suited to a hands-on leader in a fast-paced research, development, and production environment. The position may require access to classified information or restricted U.S. Government sites, systems, or information. If designated, continued employment may depend on obtaining and maintaining required government clearance or authorization and meeting applicable citizenship or other eligibility requirements. The position also requires access to export-controlled information; hiring is contingent upon the candidate being able to access applicable information without additional export licensing. Castelion is an Equal Opportunity Employer and provides reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. Duties and responsibilities may change with or without notice.

Requirements

  • At least 3 years of hands-on experience in mechanical assembly, integration, manufacturing, or field work.
  • At least 1 year of experience leading, mentoring, or coordinating the work of an assembly or production team.
  • Ability to read and interpret engineering drawings, GD&T, CAD models, bills of material, work instructions, and technical documentation.
  • Proficiency with precision hand tools, torque tools, power tools, fixtures, and basic measurement and inspection equipment.
  • Strong understanding of mechanical interfaces, fasteners, torque application, alignment, sealing, and contamination control.
  • Ability to work effectively with engineering, quality, supply chain, and operations teams in a fast-paced environment.
  • Ability to access applicable export-controlled information without additional export licensing being required.
  • If the role is designated as requiring government authorization, ability to obtain and maintain the required authorization and satisfy applicable citizenship or other eligibility requirements.

Nice To Haves

  • Experience assembling flight hardware or other safety-critical, high-reliability systems.
  • Experience with cleanroom or controlled-environment assembly, ESD controls, FOD prevention, and contamination-control practices.
  • Experience with precision alignment, bonding, sealing, harness or tubing routing, or electromechanical integration.
  • Experience creating or improving standard work, assembly instructions, travelers, checklists, and tooling.
  • Experience using digital manufacturing, quality, inventory, or work-management systems.
  • Strong written and verbal communication skills, including clearly communicating status, risks, and technical issues.
  • Demonstrated judgment, attention to detail, and commitment to safe, right-first-time execution.
  • Ability to coach others, establish priorities, and make sound decisions in a changing, high-output environment.
  • Experience with lean manufacturing, root-cause analysis, or other continuous-improvement methods.
  • Ability to work from incomplete information and help mature processes from development through initial production.

Responsibilities

  • Lead daily mechanical assembly and integration activities, assign work, and coordinate team priorities.
  • Train, mentor, and provide technical direction to assemblers and technicians while promoting ownership, safety, and quality.
  • Interpret and execute engineering drawings, models, bills of material, assembly instructions, travelers, and controlled procedures.
  • Perform and oversee precision mechanical assembly using hand tools, torque tools, power tools, fixtures, and fabrication equipment.
  • Coordinate with engineering to resolve build issues, provide manufacturability feedback, and implement design or process improvements.
  • Plan labor, tooling, materials, and work-cell readiness to maintain an efficient and predictable workflow.
  • Verify dimensions, interfaces, torque values, fit, finish, and workmanship with appropriate inspection and metrology equipment.
  • Document build status, nonconformances, rework, test results, and completed work in accordance with quality-system requirements.
  • Support integration and functional testing of mechanical assemblies and ensure hardware is configured for downstream operations.
  • Maintain clean, organized, and appropriately controlled work areas, including cleanroom or contamination-controlled environments when required.
  • Drive continuous improvement in safety, quality, throughput, standard work, tooling, and assembly processes.

Benefits

  • Castelion offers a generous benefits package; details are available at the bottom of its Careers page.
© 2026 Teal Labs, Inc
Privacy PolicyTerms of Service