Thermofluid Systems Test Engineer

Job Posting Start Date 05-06-2026 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 ----------- To support our extraordinary teams who build great products and contribute to our growth, we’re looking to add a **Thermofluid Systems Test Engineer** located in **Littleton, MA.** Reporting to the **Mechanical Development Associate Principal Engineer** the **Thermofluid Systems Test Engineer** we are seeking a **Thermofluid Systems Test Engineer** with strong hands on expertise in thermofluid systems to join our engineering team. This is an execution focused role with clear ownership from early development through qualification and product release. **What a typical day looks like:** * Own hands‑on testing of Coolant Distribution Units (CDUs) and related subsystems, including pumps, heat exchangers, tubing, valves, and fluids. * Design, build, instrument, and operate automated thermo-fluid test stands to characterize flow, pressure drop, thermal performance, and system behavior. * Develop and maintain PLC‑based controls, data acquisition, and automation for repeatable, long‑duration, and qualification testing. * Execute test plans, analyze results, and deliver clear, test‑driven feedback to design and systems engineering teams. * Support design reviews and product decisions by translating test data into actionable insights and risk assessments. * Improve lab capability by identifying gaps in tooling, instrumentation, controls, and test coverage for CDU development and validation. * Support troubleshooting and root‑cause investigations across development, qualification, production, and field issues related to thermo-fluid performance. **The experience we’re looking to add to our team:** * 7+ years of hands‑on experience testing and qualifying thermo-fluid systems in data center cooling, automotive, medical, or industrial environments, including direct experience with CDUs or comparable systems. * Strong practical understanding of fluid dynamics, thermodynamics, and heat transfer, applied to test execution and data interpretation. * Demonstrated experience leading performance and qualification testing, including flow, pressure, thermal efficiency, durability, and fault‑mode testing. * Proven ability to design, build, instrument, and commission custom thermo-fluid test stands with pumps, valves, heat exchangers, sensors, and safety interlocks. * Experience developing and executing structured test plans, qualification matrices, and acceptance criteria, with ownership of test execution and results. * Strong data acquisition and analysis skills, including sensor selection, calibration, data logging, and post‑processing. * Proficiency with PLC‑based controls and test automation, including modifying control logic for automated sequences and safe system operation. * Demonstrated ability to troubleshoot complex system‑level issues through hands‑on testing and structured root‑cause analysis. * Ability to clearly document and communicate test plans, results, failures, and margin assessments to engineering teams and senior stakeholders BO18 **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) $126,500.00 USD - $173,900.00 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 [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 JetCool, you must complete the application process first).