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Castelion · 21 hours ago

Senior Integration & Test Engineer

Torrance, CA

Full-time

Onsite

Senior Level

5+ years exp

Castelion is focused on revolutionizing defense development and production through innovative strategies. The Senior Integration & Test Engineer will lead the transition of advanced defense hardware into full production, overseeing integration, testing, and qualification processes for complex systems.

AerospaceGovernmentManufacturingMilitaryNational Security

No H1B

U.S. Citizen Only

Hiring Manager

Andy R.

Responsibilities

Take full ownership of assembly, integration, and test processes for complete hypersonic strike vehicle assemblies — including solid rocket motors, structural/composite components, mechanical, electrical, and avionics subsystems

Become an expert in system level interactions and how the vehicle operates in the field

Partner closely with design, manufacturing, and quality engineering teams to guide new hardware from concept through prototype, qualification, and production-ready status

Evaluate designs for manufacturability, testability, and producibility; feed manufacturability and test requirements back into design reviews

Develop, document, and qualify manufacturing, assembly, and test processes; create and maintain work instructions, test procedures, mBOMs, and quality/inspection standards

Design and build tooling, test stands, jigs, fixtures, and integration/test equipment as needed to support both development and production efforts

Lead hands-on build and test operations, working side-by-side with technicians and specialists to assemble flight-hardware, integrate subsystems, execute test campaigns (functional, static, environmental, acceptance), and perform go/no-go judgments

Troubleshoot integration or test failures; rapidly lead root-cause investigations and corrective-action initiatives in partnership with quality and design teams

Drive continuous process improvement: iterate on assembly flows and test procedures based on lessons learned, and scale processes as production volume grows

Plan and manage capital-equipment, facility layout, and production-line upgrades to support increasing throughput, assembly complexity, and safety requirements

Mentor and lead other engineers and technicians; cultivate a culture of accountability, technical rigor, safety, and continuous learning across the integration & test organization

Work cross-functionally with supply-chain, vendors, fabricators, and subcontractors to ensure seamless, production-ready delivery of components and subsystems

Operate comfortably in a fast-paced, resource-constrained startup environment, balancing technical excellence with aggressive schedule and business goals

Qualification

IntegrationTestingAerospace engineeringCAD/CAM softwareTest plan executionData acquisition systemsGeometric dimensioningCreative problem solvingClear communicationHigh initiative

Required

Bachelor's degree in mechanical, aerospace, or manufacturing engineering, or other technical degree

Minimum 5 years of professional experience within aerospace, defense, or a related high-reliability manufacturing/production environment — particularly in integration, test, or manufacturing roles

Demonstrated history of taking hardware from R&D or prototype phase through to production

Proficiency in CAD/CAM software (NX preferred)

Broad exposure to mechanical, structural/composite, electrical/avionics, and (optionally) propulsion or fluid/energetic systems — with ability to collaborate across disciplines

Must be willing to work extended hours and/or weekends as needed

Must be able to travel up to 30% of the time

Bias to Action and Creative Problem Solving . Desire and experience questioning assumptions in ways that lead to break through ideas that are ultimately implemented. Successfully bring in applicable processes/concepts/materials from other industries to achieve efficiency gains. Ability to personally resolve minor issues in development without requiring significant support

High Commitment, High Initiative . A successful candidate will have a genuine passion for Castelion's mission and consistently look for ways to contribute to the company's technical goals and prevent hardware blockers. Ability to work in a fast paced, autonomously driven, and demanding atmosphere. Strong sense of accountability and integrity

Clear Communicator . Proactively communicates blockers. Trusted in previous roles to be voice of company with regulators, suppliers, gate keepers and customers. Capable of tactfully managing relationships with stakeholders to achieve company-desired outcomes without compromising relationships. Emails, IMs and verbal interactions are logical, drive clarity, and detailed enough to eliminate ambiguity

To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State

Preferred

Prior experience writing, reviewing, and executing detailed test plans, procedures, and acceptance criteria — including formal qualification and environmental testing

Experience with large-scale assembly operations — including heavy lifting, crane operations, facility logistics, and safety for large hardware flow

Familiarity with avionics / flight-hardware electrical harnessing and integration; comfortable integrating electronics, wiring, and power/data systems into mechanical/structural assemblies

Experience with test-and-data-acquisition systems (DAQ), instrumentation, automation, and data analysis (e.g., Python, MATLAB, or similar)

Previous exposure to configuration-management, documentation management, build flow control, and manufacturing/ test-flow automation

Familiarity with test equipment (instrumentation, data acquisition systems, and automated test setups)

Ability to use scripting or programming languages (e.g., Python, MATLAB, SQL) for test automation, data processing, or data post-processing

Proficiency with geometric dimensioning and tolerancing (GD&T) and managing complex tolerance stack-ups

Proven ability to carry hardware from R&D/prototype phases into high-volume manufacturing