Senior Principal Mechanical Engineer, Platform Integration (Aerospace & Defense)

Location: El Segundo, California, United States; full-time, on-site position

Salary: $205,000–$245,000 annual base compensation, excluding bonus, equity, and benefits.

Company

hirify.global develops advanced sensing and detection solutions for aerospace, defense, commercial aviation, and border protection applications.

What you will do

• Provide hands-on mechanical authority for integrating electronics, enclosures, effectors, launchers, mechanisms, and support equipment into ground- and sea-mobile platforms.
• Architect and design structures, frames, mounts, enclosures, and mechanisms subject to shock, vibration, thermal, and environmental constraints.
• Develop 3D CAD models, large assemblies, interface control documents, and mechanical interfaces for multidisciplinary system integration.
• Perform structural and thermal analyses, allocate requirements, and support compliance with military standards.
• Lead system integration, qualification, acceptance, installation, alignment, and fit-check activities.
• Resolve cross-disciplinary technical issues and support customers, platform providers, suppliers, manufacturing partners, production transition, configuration control, and fielded-system sustainment.

Requirements

• Bachelor’s degree in Mechanical Engineering or a related discipline.
• 11+ years of progressively responsible experience in platform-level mechanical design and system integration for aerospace and defense applications.
• Experience integrating mechanical and mission subsystems into vehicles, mobile platforms, or fixed installations.
• Strong proficiency with CAD tools such as SolidWorks for large assemblies and top-down design, plus expertise in tolerancing, alignment, installation practices, and ICDs.
• Experience with structural analysis methods, ruggedized military hardware, environmental qualification, and standards such as MIL-STD-810.
• Ability to obtain and maintain a U.S. security clearance.

Nice to have

• Master’s degree in Mechanical Engineering or a related field.
• Experience with mechanisms, actuation systems, vehicle integration, requirements allocation, and commercial FEA or multiphysics tools.
• Knowledge of manufacturing, assembly, prototyping, additive manufacturing, CNC machining, and producibility constraints.
• Familiarity with military-style connectors and field installation, retrofit, and sustainment of complex sensor systems.

Culture & Benefits

• Medical, dental, and vision benefits fully paid by the company.
• 401(k) with a 50% company match up to 6% of pay, plus FSA, HSA, and life insurance.
• Free daily lunch, unlimited PTO, casual dress code, and no-meeting Fridays.
• Competitive base salary, pre-IPO stock options, relocation assistance, and planned annual bonuses.
• Approximately 200 employees across five global offices.