Senior NPI Mechanical Engineer

Job Posting Start Date 06-01-2026 Job Posting End Date 08-01-2026

Flex is the diversified manufacturing partner of choice that helps market-leading brands design, build and deliver innovative products that improve the world.

A career at Flex offers the opportunity to make a difference and invest in your growth in a respectful, inclusive, and collaborative environment. If you are excited about a role but don't meet every bullet point, we encourage you to apply and join us to create the extraordinary.

Job Summary

To support our extraordinary teams who build great products and contribute to our growth, we’re looking to add a Sr NPI Mechanical Engineer located in Milpitas, CA.

Reporting to the Director, Program Management, the Sr NPI Mechanical Engineer will will work closely with vendors, suppliers, and external manufacturing partners to ensure mechanical components, assemblies, and full systems meet design intent and quality expectations during all NPI phases.

This role is highly engineering-focused, requiring deep mechanical insight, strong build support, rigorous validation, and the ability to solve complex integration issues on the spot

What a typical day looks like:

• Lead hands-on mechanical engineering execution across multiple concurrent hardware NPI programs, ensuring on-time delivery through prototype, EVT, DVT, and PVT builds.
• Own mechanical build readiness by driving detailed analyses (tolerance stack-ups, GD&T, DFM/DFA reviews) to ensure manufacturable, assembly-ready designs.
• Plan and execute mechanical validation (fit/form/function, reliability testing, failure analysis) and translate results into design/build improvements.
• Provide direct build-floor support during prototype and pilot events, performing hands-on assembly, fixture setup, fit checks, torque/alignment, and verification activities.
• Rapidly debug and resolve mechanical/electrical/system integration issues, driving containment, root-cause analysis, and corrective actions for build-time failures.
• Partner with vendors/CMs/suppliers on mechanical readiness, DFM feedback, tooling/pilot support, and quality acceptance; maintain robust engineering documentation (ECOs, drawings, validation reports, work instructions, FMEAs) and communicate clearly cross-functionally.

The experience we’re looking to add to our team:

• Bachelor’s degree in Mechanical Engineering or related technical discipline.
• 6+ years of mechanical engineering experience, with significant hands-on hardware development.
• Demonstrated experience supporting or leading multiple NPI hardware programs.
• Strong understanding of mechanical design, GD&T, tolerance analysis, and fabrication processes.
• Proven hands-on engineering skills in assembly, validation, debugging, and failure analysis.
• Experience working directly with vendors and contract manufacturers.
• Strong communication and technical leadership abilities.
• Proficiency with Microsoft PowerPoint, Smartsheet, and Microsoft Project is required to support effective project planning, tracking, and communication.

#LI-EA1

EA42

SS26

AA01

CH12

MS14

CC11

EC37

PF38

JS21

NV60

FL75

What you'll receive for the great work you provide:

• Full range of medical, dental, and vision plans
• Life Insurance
• Short-term and Long-term Disability
• Matching 401(k) Contributions
• Vacation and Paid Sick Time
• Tuition Reimbursement

Pay Range (Applicable to California)$114,300.00 USD - $157,100.00 USD Annual

Job CategoryProduction Engineering

Relocation: Not eligible

Is Sponsorship Available?

No

Flex is an Equal Opportunity Employer and employment selection decisions are based on merit, qualifications, and abilities. We do not discriminate based on: age, race, religion, color, sex, national origin, marital status, sexual orientation, gender identity, veteran status, disability, pregnancy status, or any other status protected by law. We're happy to provide reasonable accommodations to those with a disability for assistance in the application process. Please email [email protected] and we'll discuss your specific situation and next steps (NOTE: this email does not accept or consider resumes or applications. This is only for disability assistance. To be considered for a position at Flex, you must complete the application process first).