Senior Manufacturing Design Engineer

Flex•Littleton, MA

About The Position

At JetCool, a Flex company, we’re at the forefront of liquid cooling innovation, delivering advanced solutions that empower our partners in AI and high-performance computing. United by a shared purpose, our teams are pushing the limits of what’s possible and tackling complex challenges. A career at JetCool offers the opportunity to make a real impact by helping build smarter, more sustainable data centers. Together, we’re not just advancing technology — we’re redefining cooling standards to create a more sustainable tomorrow. Job Summary Join JetCool , 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 Man ufacturing 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. What a typical day looks like: 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.

Requirements

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., SolidWorks) and process simulation.
Strong understanding of lean manufacturing, Six Sigma, and quality systems.
Ability to maintain an active pulse on emerging manufacturing technologies.
Excellent problem-solving skills and a collaborative mindset.

Nice To Haves

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.

Responsibilities

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.