Senior Manufacturing Design Engineer

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.

Join Jet Cool, a Flex company, if you want to be part of a dynamic, collaborative startup culture with room to grow. This is a great opportunity to be part of a mission-driven team tackling one of the biggest challenges in computing infrastructure. In this role, you will work on cutting-edge cooling technologies with real-world impact.

As a Senior Manufacturing Design Engineer in Littleton, MA
, you will play a critical role in bridging the gap between engineering and production. You will work closely with design, supply chain, and operations teams to bring our liquid cooling systems to life, ensuring they’re manufacturable, testable, and scalable for high-volume deployment.

• Collaborate with design and thermal engineering teams to ensure manufacturability of liquid cooling components and assemblies.
• Develop and optimize manufacturing processes including assembly, brazing, welding, leak testing, and quality control.
• Design and build fixtures and tooling for efficient assembly and testing of cooling systems.
• Create and maintain process documentation, including work instructions, control plans, and PFMEAs.
• Support prototype builds, pilot runs, and production ramp-up activities.
• Drive DFM/DFA initiatives to reduce cost and improve throughput.
• Work with suppliers and contract manufacturers to ensure quality and consistency.
• Lead continuous improvement projects focused on scalability, quality, and cost.
• Stay agile and responsive in a fast-paced startup environment, adapting processes as products evolve.

• Bachelor’s degree in Mechanical Engineering, Manufacturing Engineering, or related field.
• 3+ years of experience in manufacturing engineering, preferably in thermal systems, electronics, or fluid systems.
• Experience with high-volume production, including scaling from prototype to mass manufacturing.
• Demonstrated expertise in a variety of manufacturing processes such as CNC machining, brazing, welding, injection molding, and additive manufacturing.
• Proficiency in CAD tools (e.g., Solid Works) and process simulation.
• Experience in a startup or fast-paced product development environment is a plus
• Familiarity with datacenter infrastructure and server manufacturing is a plus.
• Knowledge of ISO 9001, IPC standards, and RoHS compliance is a plus.

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 (

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