Lead Mechanical Assembly - Aerospace & Defense

Castelion Corporation; Torrance (CA); On-site; USD 85,000 - 110,000; Full time

Job summary

Castelion Corporation in Torrance, CA seeks a hands-on Mechanical Assembly Lead to guide technicians through complex builds of aerospace and defense hardware. You will ensure safety, quality, and schedule adherence while collaborating with engineering, manufacturing, quality, and operations.

The role requires 3+ years in mechanical assembly and at least 1 year of leadership experience. You will read drawings, GD&T, and BOMs, using precision tools to achieve right-first-time results in a

Qualifications

• 3+ years of hands-on experience in mechanical assembly, integration, manufacturing, or field.
• 1+ years 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.

Responsibilities

• Lead daily mechanical assembly and integration activities, assigning work and coordinating priorities across the assembly team.
• 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 assembly workflow.
• Verify dimensions, interfaces, torque values, fit, finish, and workmanship using 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 properly 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.

Skills

Hands-on mechanical assembly

Leadership/mentoring

Reading engineering drawings

GD&T

CAD models

Measurement/inspection equipment

Cross-functional collaboration

Lean manufacturing

Tools

Precision hand tools

Torque tools

Power tools

Fixtures

Metrology equipment

Job description

Castelion Corporation in Torrance, CA seeks a hands-on Mechanical Assembly Lead to guide technicians through complex builds of aerospace and defense hardware. You will ensure safety, quality, and schedule adherence while collaborating with engineering, manufacturing, quality, and operations.

The role requires 3+ years in mechanical assembly and at least 1 year of leadership experience. You will read drawings, GD&T, and BOMs, using precision tools to achieve right-first-time results in a