Principal Thermal Mechanical Engineer Job Listing at Flex in Littleton, MA (Job ID WD220381)

Description

Job Posting Start Date 05-05-2026 Job Posting End Date 08-28-2026

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

Summary:

The “Systems Engineer” will be based in ……., reporting to ……

This role will be accountable for designing, defining, and implementing system requirements for complex customer systems/products and/or preparing studies and researching existing systems prior to the transition to manufacturing for new product introduction.

Responsibilities:

• Defines system specifications, input/output processes and working parameters for hardware/software compatibility.
• Coordinates design of subsystems and integration of total system.
• Identifies, explores, and resolves program deficiencies.
• Provides complex software development and consultation to prospective users.
• Tracks customer/project issues and drives resolution.
• Serves as main Project Development Engineer.
• Develops and maintains project schedule.
• Prepares and maintains Engineering NRE estimates.
• Interfaces with and guides customer product development calls and meetings.
• Acknowledges customer inquiries concerning complex system software and applications.
• Accountable for systems level development and testing requirements involving finalizing approved Vendor Lists and design of components which are unavailable.
• Provides complex technical assistance for sales presentations, product demonstrations, installation, and maintenance of company products to ensure that the system is functioning according to specifications.
• Provides technical direction, as required, for the implementation of industry regulations and best practices as they apply to product/systems.
• Develops product specifications where applicable.
• Develops and/or approves test plans and test reports.
• Defines pre-production system build logistics and deployment schedules.
• Develops engineering release documentation.
• Builds mini applications, as required, based on customer requirements to demonstrate feasibility of an application, often requiring rapid prototyping.
• Ensures ISO process conformance.

Qualifications:

• Typically requires bachelor's degree in engineering or related field or equivalent experience and training.
• Typically requires 10 years of industry experience.
• Demonstrates advanced operations, technical and people and/or process skills as well as customer (external and internal) relationship skills.
• Demonstrates detailed expertise in very complex functional/ technical area or broad breadth of knowledge in multiple areas; understands the strategic impact of the function across sites
• Demonstrates mastery of expertise in multiple areas and industry
• Impacts the medium-term (semi-annual/annual) direction and financial or operational success of the function.
• Approves and/or creates functional processes or technologies.
• Executes and provides input to functional strategic plans and objectives for site.
• Assists in developing plans for structuring and implementing major initiatives.
• Defines/ determines and approves functional methods, standards, policies and procedures. Makes decisions for sections/sub-functions. Decisions may affect multiple sections/sub-functions. Decisions may affect the 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 Massachusetts) $153,500.00 USD - $211,000.00 USD Annual Job Category Design, Process & Technology Engineering

Is Sponsorship Available?

No

JetCool 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 accessibility@flex.com 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 JetCool, you must complete the application process first).

 Apply on company website