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Mechanical Thermal Principal Design Engineer in United States

158 active opportunities · Updated October 2026

Explore current mechanical thermal principal design engineer jobs across United States. Filter by work mode, employment type, experience, department, date posted and distance.

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📍 San Francisco, California, United States· Full-time
✓ Quality checkedCompany trend -80.2%

About the Team OpenAI is building the infrastructure foundation for the next generation of AI. The Data Center Engineering team defines the strategy, reference architectures, technical requirements, and delivery standards for the large-scale data centers that support OpenAI research, products, and infrastructure partners. As a Data Center Controls Network Engineer, you will design, validate, and scale the controls and OT network architectures that support high-density AI data centers. You will work across controls systems, OT infrastructure, telemetry, commissioning, deployment, and operations, partnering with mechanical, electrical, IT/networking, security, and external delivery teams. About the Role We are seeking a mid to senior OT Network Engineer with a strong controls systems background to lead the design and operation of resilient, secure, and scalable OT network architectures for high-density AI data centers. This role translates compute, power, cooling, and operational requirements into practical OT network designs, evaluates vendor solutions, and drives technical decisions across controls infrastructure, telemetry, commissioning, and operations. The ideal candidate has strong hands-on experience in mission-critical OT environments, including industrial networking, virtualized infrastructure, and OT network operations, with expertise in routing, switching, segmentation, firewall policy, time synchronization, monitoring, and network lifecycle support. Key Responsibilities Define controls, automation, and OT network requirements for AI data center campuses. Develop reference architectures, engineering standards, and reusable design templates. Review and develop basis-of-design and functional design documents, including OT network diagrams, IP/VLAN schemes, telemetry architectures, data flow diagrams, and commissioning requirements. Design OT and infrastructure network architectures, including physical topology, logical topology, IP addressing, subnetting, VLA

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O
📍 San Francisco, California, United States· Full-time
✓ Quality checkedCompany trend -80.2%

About the Team OpenAI’s Hardware organization develops AI-native silicon and system-level solutions for the unique demands of advanced AI workloads. Building on efforts like Jalapeño, the team is developing future generations of AI-native silicon and tightly integrated systems to power the next generation of frontier models. By co-designing chips, systems, tools, and methodologies, the team helps deliver faster, more efficient, and production-ready hardware for OpenAI’s supercomputing platform. About the Role OpenAI's Hardware organization builds supercompute platforms from silicon and boards to full rack-scale systems to power advanced AI workloads. This role owns end-to-end quality for high-speed interconnect hardware across the product lifecycle: early design influence, supplier/contract manufacturer readiness, qualification, ramp, and fleet quality in lab and data center environments. You will be the quality lead for advanced interconnect components and assemblies, including high-speed copper cables, cable cartridges, patch panels, backplane/cable-backplane solutions, high-speed connectors, and related electro-mechanical interfaces. You will partner closely with electrical, mechanical, SI/PI, systems, reliability, operations, and external vendors to prevent escapes and drive rapid, data-driven containment and corrective action. In this role you will: Own quality for advanced interconnect components and assemblies: high-speed connectors, high-speed copper cables, cable cartridges (e.g., cable cassette style assemblies), patch panels & optics, and backplane/cable-backplane interconnect solutions. Drive quality-by-design: participate in design reviews, DFM/DFx, tolerance stacks, material and plating selections, connector mating strategy, strain relief, and assembly methods to reduce variation and field failures. Define and track quality and reliability metrics (DPPM, yield, escapes, RMA/FRACAS trends, Cpk/Ppk where applicable) for interconnects across NPI and m

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O
📍 San Francisco, California, United States· Full-time
✓ Quality checkedCompany trend -80.2%

About the Team OpenAI is building the infrastructure foundation for the next generation of AI. The Data Center Engineering team defines the strategy, reference architectures, technical requirements, and delivery standards for the large-scale data centers that support OpenAI research, products, and infrastructure partners. As a Data Center Infrastructure Engineering Program Manager, you will help turn complex infrastructure strategy into executable programs across electrical, mechanical, controls, network, hardware, construction, commissioning, deployment, and operations workstreams. You will partner with research, hardware engineering, data center engineering, site development, supply chain, security, EHS, finance, legal, operations, and external delivery partners to bring OpenAI's infrastructure vision to life. About the Role We are looking for an Engineering Program Manager (EPM) to lead assigned infrastructure programs focused on production and non-production network integration, controls coordination, and the design and deployment of data hall or whitespace facilities. The EPM will support functional Directly Responsible Individuals (DRIs) across network, controls, structural, electrical, and mechanical disciplines. Key responsibilities include coordinating assigned workstreams and program controls, maintaining risks and interfaces, and supporting readiness within the network and data hall deployment track. The ideal candidate thrives on bringing structure to complex environments characterized by ambiguous technical requirements, large partner ecosystems, tight deadlines, and high operational stakes. This individual must be adept at keeping teams aligned on decisions, risks, dependencies, schedules, and readiness criteria, and escalating gaps or decision points when needed. Candidates should have a proven track record of managing technically challenging engineering programs across major lifecycle phases, including design, validation, procurement, construction, c

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📍 Honolulu, Hawaii, United States
✓ High-confidence listingCompany trend +26.9%

$36 – $57/hr

Quick readStrong listing-quality and freshness signals

Job Title Field Service Engineer, Multimodality Imaging (Travel: Honolulu, HI) Job Description Allow your passion for improving lives to shine in this role where you’ll be responsible for customer relationship management through the effective use of technical knowledge to install, troubleshoot, service, and maintain equipment at customer sites. Considering candidates who are willing to relocate to Honolulu, HI. Your role: Provide exceptional customer service by adhering to customer entitlements, setting clear expectations, and meeting commitments and arrival times to address and resolve customer needs. Understand the customer's business and competitive environment; generate service revenue. Actively participate as a member of the regional work team; work to improve team processes and identify training gaps. Seek out opportunities to increase capability and capacity (i.e. may be required to become qualified in multiple modalities, learns new tools). Perform all administrative duties within established Philips, State, and Federal regulatory requirements and timeframes including timesheets, service work orders, expense reports, Field Change Orders (FCO), preventative maintenance (PM), installation documents, site and service documentation, and other related paperwork. Adhere to established training, quality, and safety requirements. Utilize tools, support, resources, and escalation processes within required time frames to resolve customer and system problems timely and effectively. Complete PMs, FCOs, installation and all related tasks (diagnose and resolve electronic, network, and mechanical problems). Approximately 70% travel across the specified geography is required. The average driving time is 1-4 hours daily. Occasional overnight stays and travel by air and/or train may be required. You're the right fit

Customer Service
JI
📍 Chattanooga, United States
✓ High-confidence listingCompany trend +1800%
Quick readStrong listing-quality and freshness signals

JLL empowers you to shape a brighter way . Our people at JLL are shaping the future of real estate for a better world by combining world class services, advisory and technology for our clients. We are committed to hiring the best, most talented people and empowering them to thrive, grow meaningful careers and to find a place where they belong. Whether you’ve got deep experience in commercial real estate, skilled trades or technology, or you’re looking to apply your relevant experience to a new industry, join our team as we help shape a brighter way forward. Maintenance Mechanic – JLL What this job involves: The Maintenance Mechanic plays a critical role in supporting building operations by performing preventive maintenance, responding to service requests, and completing general repairs across facility systems and equipment. This position helps ensure safe, efficient, and reliable building performance while delivering best-in-class customer service to tenants and clients. Working independently and collaboratively with the operations team, the Maintenance Mechanic contributes directly to operational excellence, tenant satisfaction, and JLL’s commitment to maintaining high safety and service standards. What your day-to-day will look like: Perform preventive maintenance and corrective repairs on mechanical, electrical, plumbing, and other building systems and equipment. Utilize the CMMS work order system to manage and complete assigned maintenance tasks in a timely manner. Complete general building repairs including ceiling tiles, carpet tiles, floor tiles, minor plumbing, minor HVAC, and minor electrical work. Conduct facility rounds and proactively identify building conditions requiring attention or r

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JI
📍 Pontiac, MI, United States
✓ High-confidence listingCompany trend +1800%
Quick readStrong listing-quality and freshness signals

JLL empowers you to shape a brighter way . Our people at JLL are shaping the future of real estate for a better world by combining world class services, advisory and technology for our clients. We are committed to hiring the best, most talented people and empowering them to thrive, grow meaningful careers and to find a place where they belong. Whether you’ve got deep experience in commercial real estate, skilled trades or technology, or you’re looking to apply your relevant experience to a new industry, join our team as we help shape a brighter way forward. Maintenance Supervisor – JLL What this job involves: This UAW Maintenance Supervisor position is a hands-on technical role for our Pontiac, MI, location with a very high expectation of "wrench time." You will be a critical part of our facilities team, responsible for maintaining, troubleshooting, and repairing essential equipment across multiple buildings. We are seeking a multi-skilled expert with a strong focus on plumbing who can independently diagnose and resolve issues with HVAC, water/steam processes, and other building infrastructure. This role is essential for ensuring our client's facilities operate safely and efficiently, requiring a high level of technical expertise and the readiness to respond to on-call emergencies. This position operates under the International Union of Operating Engineers (IUOE Local 99). What your day-to-day will look like: Perform all routine maintenance, repairs, and installations of plumbing, HVAC, and building mechanical systems. Diagnose and troubleshoot critical equipment, including supply air units, exhaust fans, pressure boiler systems, pumps, and valves. Monitor equipmen

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JI
📍 North Haven, CT, United States
✓ High-confidence listingCompany trend +1800%
Quick readStrong listing-quality and freshness signals

JLL empowers you to shape a brighter way . Our people at JLL are shaping the future of real estate for a better world by combining world class services, advisory and technology for our clients. We are committed to hiring the best, most talented people and empowering them to thrive, grow meaningful careers and to find a place where they belong. Whether you’ve got deep experience in commercial real estate, skilled trades or technology, or you’re looking to apply your relevant experience to a new industry, join our team as we help shape a brighter way forward. RME Operator - JLL What this job involves: At JLL, we are collectively shaping a brighter way for our clients, ourselves, and our fellow employees—and nowhere is that more evident than in our operations partnership with our client . As an RME Operator, you'll be at the heart of business operations, working behind the scenes to maintain the speed, accuracy, and exceptional service they're known for worldwide. In this role, you'll combine electronic, mechanical, computer, and automation engineering skills to keep complex high-performance manufacturing systems running smoothly. You'll work with cutting-edge robotics and material handling equipment that enables tens of thousands of products to reach hundreds of customers

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JI
📍 Kenosha, WI, United States
✓ High-confidence listingCompany trend +1800%
Quick readStrong listing-quality and freshness signals

JLL empowers you to shape a brighter way . Our people at JLL are shaping the future of real estate for a better world by combining world class services, advisory and technology for our clients. We are committed to hiring the best, most talented people and empowering them to thrive, grow meaningful careers and to find a place where they belong. Whether you’ve got deep experience in commercial real estate, skilled trades or technology, or you’re looking to apply your relevant experience to a new industry, join our team as we help shape a brighter way forward. RME Operator - JLL What this job involves: At JLL, we are collectively shaping a brighter way for our clients, ourselves, and our fellow employees—and nowhere is that more evident than in our operations partnership with our client . As an RME Operator, you'll be at the heart of business operations, working behind the scenes to maintain the speed, accuracy, and exceptional service they're known for worldwide. In this role, you'll combine electronic, mechanical, computer, and automation engineering skills to keep complex high-performance manufacturing systems running smoothly. You'll work with cutting-edge robotics and material handling equipment that enables tens of thousands of products to reach hundreds of customers

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I
📍 Arizona, Phoenix, United States
✓ High-confidence listingCompany trend +315.4%
Quick readStrong listing-quality and freshness signals

Job Details: Job Description: As a Module Equipment Technician, you will play a vital role in ensuring the smooth operation of advanced manufacturing equipment used in semiconductor production. You will perform hands-on troubleshooting, maintenance, and calibration of electromechanical systems while supporting experiments and equipment modifications that drive cutting-edge advancements. Your work will directly contribute to enhancing equipment reliability and optimizing production efficiency, making an essential impact on Intel's manufacturing operations. Business Group Join Intel's Advanced Packaging Technology Development - Substrate and Wafer Assembly (ATPD: SWA) organization, a leader in delivering innovative and cost-effective substrate packaging solutions. This business group is focused on advancing Intel's capabilities in manufacturing technology to maintain competitive excellence across global markets. As part of this dynamic team, you will support critical equipment and collaborate on continuous improvement initiatives that align with Intel's broader mission of innovation and growth. Key Responsibilities Perform electrical and mechanical troubleshooting to diagnose issues with manufacturing equipment. Execute setup, calibration, corrective and preventative maintenance on production equipment, including wet chemistry, plating, and dry high-vacuum toolsets. Monitor tool performance and analyze data to identify and address equipment-related issues. Collaborate with engineering and support teams to improve equipment reliability and reduce downtime. Document maintenance activities, repair findings, and parts usage using established systems and procedures. Lead or contribute to continuous improvement projects, focusing on equipment optimization and yie

Recruitment
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📍 Ogden, UT, United States
✓ High-confidence listingCompany trend +515.8%
Quick readStrong listing-quality and freshness signals

Radiation Environmental Test Engineer (Mid-Level or Senior) Company: The Boeing Company Boeing Missile & Weapons Systems is seeking a Radiation Environmental Test Engineer (Mid-Level or Senior) to lead radiation and environmental test efforts supporting ICBM modernization at the Little Mountain Test Facility in Hill Air Force Base, UT. This hands-on role combines test design, execution, data analysis, and facility/test-stand maintenance. The position supports ongoing modernization efforts to enhance current test capabilities and new developing capabilities—identifying, designing, managing, and integration of new test stands, diagnostics, and data systems to meet evolving mission requirements. Position Responsibilities: Lead and execute complex radiation and environmental test machine design and facility integration Identify interface requirements, CDRLs, configuration control documentation, and change orders Design, specify, and integrate test hardware, sub-assemblies, fixtures, and instrumentation Assist in configuring, validating, and operating data acquisition systems and custom software (LabVIEW) for diagnostics and event capture Support pulse power and flash X-ray systems: theory, operation, diagnostics, and data capture Perform technical evaluation of subcontractors Basic Qualifications (Required Skills and Experience): Bachelor of Science degree in Engineering (with a focus in Electrical, Mechanical or Aeronautical), Computer Science, Data Science, Mathematics, Physics, Chemistry or non-US equivalent qualifications directly related to the work statement Level 3: 5+ years of related work experience and a bachelor’s degree or an equivalent combination of related work

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📍 Sheppard Afb, TX, United States
✓ High-confidence listingCompany trend +515.8%
Quick readStrong listing-quality and freshness signals

Training Device Technician (Training Device Maintenance) Company: Boeing Aerospace Operations Boeing Global Services (BGS) and the F-22 GTE Services Team are seeking a Mid-Level Training Device Technician (Maintenance) to support our team in Sheppard AFB, TX . This position is expected to be 100% onsite. The selected candidate will be required to work onsite at the Sheppard AFB, Texas facility. Position Responsibilities: Provide F-22 training device maintenance services at Sheppard AFB, TX. Assists in repairs, tests, installs, configures, upgrades and assists in the modification of F-22 Maintenance Training Device (MTD) components, devices, hardware and software. Performs detailed inspections for pre-operations, post-operations and component handling. Inspect components and LRU's to verify status prior to installation. Consults with engineers in troubleshooting systems and support equipment. Troubleshoot to isolate mechanical or electrical faults and repair faulty components. Performs functional test of training device systems and monitors device instrumentation and indicators. Performs a multi-disciplined range of technical systems applications and activities. Installs, configures and maintains multi-platform systems hardware, software and components. Ensuring systems conform to architectural objectives. Evaluates complex system’s production readiness and supportability. Documents work by engineering planning documents and/or technical manuals. Excellent customer interface skills and communication skills, both oral and written, are required. Must be able to work independently, one-on-one, and in a team setting. Logisti

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📍 Huntington Beach, Canada
✓ High-confidence listingCompany trend +515.8%
Quick readStrong listing-quality and freshness signals

Experienced Electro-Optical Infrared Design, Assembly, Integration, and Test Engineer Company: The Boeing Company Boeing Defense, Space and Security (BDS) is looking for an Experienced Electro-Optical Infrared Design, Assembly, Integration, and Test Engineer (Level 3) to join our team in Huntington Beach or El Segundo, California. This position will be joining a team of engineers, analysts and staff within the Space and Missile Systems (SMS) and Boeing Technology and Innovation (BTI) Mission Systems organizations in the development, assembly, integration, and test of a constellation of satellites. The SMS and BTI organizations develop and capture technology for designing disruptive Mission Systems solutions. Focused on visible and infrared spectrum Electro-Optics Infrared (EO/IR) sensors operating in Space and Air domains, our growing team is leaping ahead of our competition with an exceptional mix of mission architectures, sensor designs, and algorithms for advanced image and data processing. Position Responsibilities: Develops and validates requirements for various communication, sensor, electronic warfare and other electromagnetic systems and components Develops and validates electromagnetic requirements for electrical\electronic systems, mechanical systems, interconnects and structures Develops architectures to integrate systems and components into higher level systems and platforms Performs trade studies, modeling, simulation and other forms of analysis to predict component, interconnects and system performance and to optimize design around established requirements Defines and conducts tests to validate performance of designs to requirements Manages appropriate aspe

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📍 California, United States of America, United States
✓ High-confidence listingCompany trend +103.7%

$180K – $270K/yr

Quick readStrong listing-quality and freshness signals

Lead RF Systems and Defense Engineer- HP IQ Description - Who We Are HP IQ is HP’s new AI innovation lab. Combining startup agility with HP’s global scale, we’re building intelligent technologies that redefine how the world works, creates, and collaborates. We’re assembling a diverse, world-class team—engineers, designers, researchers, and product minds—focused on creating an intelligent ecosystem across HP’s portfolio. Together, we’re developing intuitive, adaptive solutions that spark creativity, boost productivity, and make collaboration seamless. We create breakthrough solutions that make complex tasks feel effortless, teamwork more natural, and ideas more impactful—always with a human-centric mindset. By embedding AI advancements into every HP product and service, we’re expanding what’s possible for individuals, organisations, and the future of work. Join us as we reinvent work, so people everywhere can do their best work. About The Role HP IQ's Wireless Technology Team works cross-functionally with Electrical Engineering, Software, Mechanical Engineering, Product Design, Industrial Design, Program Management, and Operations to develop next-generation wearable and AI-connected products. As a Lead RF Systems & Desense Engineer, you will own the RF system architecture from concept through mass production. You will lead RF integration across Wi-Fi, Bluetooth, UWB, NFC and emerging wireless technologies while driving RF desense, coexistence, and wireless performance for highly integrated products. <span style=

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📍 California, United States of America, United States
✓ High-confidence listingCompany trend +1850%
Quick readStrong listing-quality and freshness signals

We anticipate the application window for this opening will close on - 10 Oct 2026 Careers that change lives start here. Medtronic is a global leader in healthcare technology with a Mission to alleviate pain, restore health, and extend life. Our 95,000 employees work across more than 150 countries to put patients first — developing innovative medical technologies that improve the lives of 72&#43; million patients each year. Your unique talents will help shape the future of healthcare while building a career grounded in purpose, growth, and impact. A Day in the Life The Neuromodulation Research & Development organization develops therapies and technologies that address chronic pain and other neurological conditions. Within the Interventional Pain portfolio, teams focus on minimally invasive therapies used to treat musculoskeletal pathologies, including vertebral compression fractures, nerve pain, metastatic bone tumors, and benign bone tumors. This role supports the development of system-level verification and validation strategies for new products and enhancements across mechanical, electrical, and software components. This position is based in Santa Clara, California, and follows an onsite work model. No travel is required for this role. As a Research & Development Test Engineer, you will lead and execute verification and validation activities that support the development of interventional pain therapies and associated medical device systems. You will collaborate with cross-functional partners to define test strategies, evaluate product performance, manage technical risks, and generate evidence needed to support product development and regulatory requirements. Primary Responsibiliti

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I
📍 California, United States
✓ High-confidence listing
Quick readStrong listing-quality and freshness signals

What if the work you did every day could impact the lives of people you know? Or all of humanity? At Illumina, we are expanding access to genomic technology to realize health equity for billions of people around the world. Our efforts enable life-changing discoveries that are transforming human health through the early detection and diagnosis of diseases and new treatment options for patients. Working at Illumina means being part of something bigger than yourself. Every person, in every role, has the opportunity to make a difference. Surrounded by extraordinary people, inspiring leaders, and world changing projects, you will do more and become more than you ever thought possible. This position maintains and repairs the facility's structure, equipment and ground, including plumbing, electrical and HVAC. Key Responsibilities: Responsible for mechanical service calls and in-house repairs throughout facility and grounds. Performs skilled trade work, such as carpentry or painting in the construction, repair or alteration of structures such as walls, roofs or office fixtures. Monitor, maintain document and perform preventative maintenance on HVAC system including central plant. May provide guidance and oversee other personnel. May work from sketches, blueprints, and drawings. Act as liaison and supervise work of contractors. Be on call and able to respond 7/24/365. Listed responsibilities are an essential, but not exhaustive list, of the usual duties associated with the position. Changes to individual responsibilities may occur due to business needs. Requirements: Requires 2-5 years of related experience Ability to continually learn through on-t

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