Principal Applications Engineer (DC-DC)

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

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

The Principal Applications Engineer will be based in San Jose, CA reporting to the Director, Global Field Application Engineering. The Applications Engineer will be accountable for providing technical guidance and design-in help to customers on a post-sales basis to enable delivery of design, fabrication, and assembly goals, per customers' expectations.

What a Typical Day Looks Like:

• Uses technical knowledge of products and associated development tools to assist customers on complex issues.
• Conducts complex qualification/verification testing onsite (local labs) and coordinates closely with design engineering to solve any issues and deliver results on time. The onsite part can be 50-75% of the time (the rest of the time would be remote/work from home).
• Develops and maintains close relationships to work very closely with internal engineering and business development teams.
• Build close relationships with the customer technical teams to work and collaborate closely with them.
• Provides technical expertise during product development by defining/conveying customer product needs and translating these needs into new product recommendations and specifications.
• Reviews customer requirements, identifies and communicates potential issues and provides recommendations that will meet both the capabilities Flex and the specifications of the customer.
• Creates clarity: identifies and clearly communicates existing and potential design issues both internally and externally.
• Coordinates product integration efforts between component suppliers, Flex, and the customer.
• Develops and presents technical seminars for customers and Field Application Engineers to promote employers' manufacturing capabilities, services, available technologies, manufacturing process and quality.
• Provides best in class, complex, technical assistance by answering and closing all customer and program management technical questions related to manufacturing capabilities including design, fabrication, and assembly abilities.
• Defines initial project/product scope and prepares project plans to meet customers' expectations.
• Prepares detailed project plans by documenting customers' requirements and incorporating design and manufacturing capabilities to meet customers' expectations.
• Prepares and maintains required documentation.
• May be required to sit at customer site (locally) for prolonged periods of time.

The Experience We're Looking to Add to Our Team:

• Bachelor's degree in electrical engineering (master's preferred).
• 8+ years of design and/or applications engineering experience in the power conversion area (dc-dc conversion preferred).
• Demonstrates detailed expertise in complex functional/technical area with a deep understanding of power electronics and power conversion considerations.
• Is extremely comfortable in the lab environment and can expertly conduct verification/qualification testing for extended periods of time at the (local) lab/s.
• Provides key technical support to mid-large customers promptly.
• Executes and provides input to functional strategic plans and objectives for the group/site.

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)

$150,000.00 USD - $206,300.00 USD Annual

Job Category
Design, Process & Technology Engineering

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 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).