Littleton, Massachusetts, United States · On-site
$127k–$174k/yr
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 pus…
Skills: Thermal Architecture, CFD Modeling, Fluid Dynamics, Heat Transfer, Liquid Cooling
Hanscom AFB, Massachusetts, United States · On-site
SECURITY CLEARANCE REQUIREMENT: TS, WITH SCI ELIGIBILITY ***POSITION REQUIRES US CITIZENSHIP*** Position Title: Network/System Administrator III Location: Hanscom AFB, MA Position Description: The primary function will b…
Skills: Network Administration, System Administration, Cybersecurity Operations, Risk Management Framework, Virtualization
Wilmington, Delaware, United States · Hybrid
$90k–$149k/yr
Overview The Digital Assets Product Manager is responsible for the design, development, execution, and ongoing performance of digital asset and digital custody solutions for Institutional Services clients. This role sets…
Skills: Digital Asset Product Management, Digital Custody, Blockchain Architecture, Stablecoins, Tokenized Assets
Tewksbury, Massachusetts, United States · On-site
$87k–$165k/yr
Date Posted: 2026-06-22 Country: United States of America Location: US-MA-TEWKSBURY-TB3 ~ 50 Apple Hill Dr ~ CONCORD BLDG, Tewksbury Tb3 300 Concord Position Role Type: Onsite U.S. Citizen, U.S. Person, or Immigration St…
Skills: LynxOS, RHEL Linux, C, C++, Python
Boston, Massachusetts, United States · Remote OK
$115k–$151k/yr
Who We Are: Interra Health is a fast-growing healthcare technology company transforming how providers and patients navigate the prescription journey. Formed through the merger of DoseSpot, Arrive Health, and pVerify, Int…
Skills: AWS, Azure, Snowflake, Dbt, Python
Lexington, Massachusetts, United States · On-site
$113k–$257k/yr
FMS Mission Planning Systems Engineer, Lead The Opportunity: Serve as the Lead FMS Systems Engineer supporting Foreign Military Sales (FMS) Mission Planning programs within the Airspace Mission Planning (AMP) enterprise.…
Skills: Systems Engineering, Foreign Military Sales, Mission Planning Systems, Requirements Decomposition, Technical Evaluation
Burlington, Massachusetts, United States · Hybrid
$65k–$114k/yr
Who we are: Charles River Development (CRD) is the FinTech division of State Street. Together with State Street’s Middle and Back-office services, Charles River’s cloud-based Front Office technology forms the foundation …
Skills: Java, C#, PowerShell, Bash, Rest Assured
Boston, Massachusetts, United States · On-site
$90k–$110k/yr
Who We Are: Our story began in 2011 when a group of office workers at a major logistics company in Chicago had a lunch problem. Nearby options were limited and the team was spending too much time and money traveling to t…
Skills: Outbound Prospecting, Lead Generation, B2B Sales, Closing, Negotiation
Natick, Massachusetts, United States · Hybrid
$90k–$105k/yr
We are seeking a creative and technically skilled UI/UX Software Engineer to join our Product Development Team at Delsys. In this hybrid role, you’ll split your time between designing intuitive user experiences and imple…
Skills: UI/UX Design, Front-end Development, C#, Java, JavaScript
Natick, Massachusetts, United States · On-site
$90k–$110k/yr
We are seeking highly motivated candidates to contribute to Delsys’ research and development of next-generation, human-centric sensor technology. Software Engineers in this role will focus on building robust backend syst…
Skills: C++, Python, Signal Processing, Computer Vision, Embedded Systems
Natick, Massachusetts, United States · On-site
$28/hr–$32/hr
Delsys seeks a motivated candidate with a strong interest in the design and application of wearable sensors and instruments for measuring human performance. We are currently focused on designing next-generation sensors a…
Skills: CAD Design, Additive Manufacturing, Mechanical Prototyping, Data Analysis, Verification and Validation
Boston, Massachusetts, United States · On-site
$80k–$110k/yr
When you join the growing BILH team, you're not just taking a job, you’re making a difference in people’s lives. Modifies, manages, upgrades, and maintains the Plant Operations Department via Computerized Maintenance Man…
Skills: CMMS Management, SQL, Database Administration, Maximo, Data Integrity
Natick, Massachusetts, United States · On-site
$85k–$105k/yr
We are seeking motivated candidates with a strong interest in analog instrumentation design, and in interfacing varieties of transducers and sensing systems to wearable sensor constructs. Successful candidates will work …
Skills: Analog Instrumentation Design, Transducer Interfacing, Circuit Simulation, Schematic Capture, PCB Layout
Natick, Massachusetts, United States · On-site
$90k–$105k/yr
We are seeking an aspiring Backend Software Engineer to join our Product Development Team at Delsys. You’ll help build the core infrastructure behind our signal acquisition and processing software, powering innovative so…
Skills: Java, C#, C++, Object-Oriented Design, MVVM
Natick, Massachusetts, United States · On-site
$28/hr–$34/hr
Delsys seeks highly motivated candidates to contribute to our research and development of next-generation, human-centric sensor technology. Delsys R&D Software Engineers collaborate with engineers and scientists to solve…
Skills: C#, C++, Object-Oriented Design, Full Stack Development, Windows Applications
Natick, Massachusetts, United States · On-site
$28/hr–$32/hr
We are seeking motivated candidates with a strong interest in analog instrumentation design, and in interfacing varieties of transducers and sensing systems to wearable sensor constructs. Successful candidates will work …
Skills: Analog Instrumentation Design, Transducer Interfacing, Circuit Simulation, Schematic Capture, PCB Layout
Natick, Massachusetts, United States · On-site
$85k–$110k/yr
At Delsys, we develop innovative, human-centric sensing technologies that advance health science, human performance, and rehabilitation research. We are seeking an R&D Engineer who is passionate about designing algorithm…
Skills: Signal Processing, Computer Vision, Python, C++, Machine Learning
Natick, Massachusetts, United States · On-site
$28/hr–$34/hr
Delsys is seeking highly motivated candidates to contribute to our next-generation neural processing systems. Delsys R&D Interns (Biomedical) collaborate with engineers and scientists to solve challenges spanning the fie…
Skills: Python, C, C++, C#, Object-Oriented Design
Boston, Massachusetts, United States · On-site
$170k–$268k/yr
Who we are looking for We are looking for a State Street Markets Product Strategy Digital, Managing Director reporting directly to senior Markets leadership. You will define and drive executions of a Markets specific Dig…
Skills: Digital Assets Strategy, Tokenization, Product Management, Cross-asset Products, Market Infrastructure
Hopkinton, Massachusetts, United States · Hybrid
$115k–$130k/yr
cb20 is a technology solutions provider of choice for organizations that value IT and Managed Services expertise and category-leading customer service. We partner with the world’s leading hardware and software companies …
Skills: AV Project Management, Organizational Skills, Multitasking, Verbal Communication, Written Communication
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The Senior Thermal Systems Engineer owns the end-to-end architecture, analysis, and deployment of direct-to-chip cooling systems for high-TDP components. They lead technical partnerships across engineering and manufacturing teams to deliver scalable, high-performance cooling products.
Requires a BS/MS in Mechanical or Aerospace Engineering with 5+ years of experience in thermal design for high-power electronics. Proficiency in CFD tools and hands-on experience with lab instrumentation and product development cycles is essential.
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.
To support our extraordinary teams who build great products and contribute to our growth, we’re looking to add a Senior Thermal Systems Engineer located in Littleton, MA.
Reporting to the Product Manager the Senior Thermal Systems Engineer will own the end-to-end architecture, analysis, validation, and deployment of direct-to-chip (D2C) cooling systems used to cool high-TDP CPUs/GPUs/accelerators. They will be the technical leader partnering with Product Management, Mechanical/Electrical Engineering, Manufacturing, Quality, Reliability, and key customers to deliver robust, scalable products that meet performance, reliability, and cost targets.
Own thermal architecture & modeling
Define system-level thermal requirements (TDP range, ΔT, coolant temperature, flow rate, pressure drop, acoustic & power budgets).
Apply first principles in fluid dynamics and heat transfer to analyze design concept thermal performance
Build and validate 1D/3D models (e.g., FloEFD, Icepak, MacroFlow, ANSYS Fluent, COMSOL) for cold plates, manifolds, quick-disconnects (QDs), pumps, and CDUs.
Perform sensitivity trade-offs (flow distribution, fin geometry, microchannel optimization, TIM selection, manifold topology).
Design liquid cooling subsystems
Specify and refine cold plates, CDUs, manifolds, hoses/QDs, reservoirs, filters, sensors, and controls.
Collaborate with ME/EE on mechanical stack-up, materials, corrosion mitigation (galvanic compatibility), and leak risk reduction.
Define DFX (DFM/DFA/DFT) and lead EVT/DVT/PVT from prototypes to mass production.
Validate and qualify
Develop test plans for thermal performance, pressure integrity, leak detection, long-term reliability (HALT/HASS), and contamination control (particulates, biogrowth).
Execute lab and rack-scale testing (pump curves, flow balance, ΔP mapping, heat load emulation, transient behavior).
Drive failure analysis and corrective actions (FMEAs, 8D/PPS).
Partner across the business
Work with Product Management on PRDs, roadmaps, and business cases.
Support manufacturing process development (leak/pressure test stations, purge and fill, cleanliness criteria) and supplier selection/qualification.
Engage with customers: define requirements, run pilots, analyze fleet telemetry, and support deployment at scale.
BS/MS in Mechanical Engineering or Aerospace Engineering or related field (PhD a plus).
5+ years experience in thermal design/validation for high-power electronics (preferably data center/server/HPC).
Excellent first principles knowledge in fluid dynamics, thermodynamics, and heat transfer
Proven expertise in liquid cooling, including CFD, pressure drop/flow modeling, and thermal metrology.
Hands-on with lab instrumentation (flow meters, pressure transducers, thermocouples/RTDs, DAQ, leak detectors) and test automation (Python, LabVIEW, or similar).
Experience bringing products from EVT → DVT → PVT → ramp, including DFX and supplier engagement.
Excellent technical communication and documentation skills.
BO18
Application Deadline:
Applications for this job position will be accepted for at least five days following the job posting start date below and continuing until the end date below or until the position is filled. This posting may close sooner due to application volume.
Job Posting Start Date 06-22-2026 Job Posting End DateThe base pay range for this position is provided below. The final base rate offered will be determined using job-related, non-discriminatory criteria, including but not limited to experience, qualifications, geographic location, education, external market data, and internal equity.
$126,500.00 USD - $173,900.00 USD AnnualIs Sponsorship Available?
NoJetCool 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).
Flex (Reg. No. 199002645H) is the global manufacturing partner of choice that helps leading brands design, build, and manage products that improve the world. For more information, visit flex.com. We love to hear your thoughts, comments and ideas so feel free to like, share and comment away. Any question or opinion is good to go as long as it is respectful and falls within the scope of this page. Derogatory comments, spam and unsolicited selling are not welcome here and such posts will be removed.
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