Liquid Cooling Mechanical Engineer

Accelsius LLC; Austin, Northern (TX, KY); Hybrid; USD 120,000 - 160,000; Full time

Benefits offered by this job

Equity

Medical and dental insurance

401K

Flexible PTO

Job summary

Accelsius LLC in Austin, TX is seeking a Liquid Cooling Mechanical Engineer to design server-level liquid cooling hardware for AI and HPC platforms. The role covers cold plate loops, tubing, manifolds, and pressure‑containing assemblies, from prototype to production release.

You will translate prototypes into manufacturable hardware, partner with thermal engineers on sizing and flow, and work with suppliers, R&D technicians, and customers to validate designs in the lab.

Qualifications

• 5+ years of experience with progressively increasing responsibility.
• Direct experience designing liquid cooling hardware for data center servers or racks.
• Proficiency in a parametric 3D CAD tool and manufacturing drawings with GD&T.

Responsibilities

• Design and CAD: translate prototypes into production-ready designs for server liquid cooling hardware.
• Produce 3D models, drawings with GD&T, BOMs; manage revisions through ECOs in PLM.
• Lead design reviews and mentor engineers; work with suppliers and customers.

Skills

Liquid cooling design

Fluid mechanics

Cross-disciplinary collaboration

Education

Bachelor’s degree in mechanical engineering

Tools

SolidWorks

Job description

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

Liquid Cooling Mechanical Engineer

Full Time Austin, TX, US

12 days ago Requisition ID: 1065

Liquid Cooling Mechanical Engineer

Interested in getting in at the ground floor of a new, disruptive company attacking an important multi-billion-dollar problem? Businesses and consumers continue to demand increasing data services at an exponential rate -- streaming, deep learning, analytics, loT connectivity, and more. What this means is higher performing CPUs, components, servers, and ultimately Data and Edge computing centers, all generating excessive heat that is increasingly difficult to manage with traditional cooling systems. Accelsius is developing revolutionary direct-to-chip, 2-Phase cooling technologies that empower and enable Server OEMs, Data Centers, and Edge Computing Operators, to meet performance, sustainability, scale, and cost goals while serving this high-growth market for data services.

Accelsius is looking for a Liquid Cooling Mechanical Engineer to design server-level liquid cooling hardware for AI and HPC platforms: cold plate loops, server plumbing, manifolds, and the pressure-containing assemblies that connect them. This engineer will take designs from first prototype through production release, translating thermal engineers’ prototypes into manufacturable hardware, and will work alongside our R&D technicians to validate them in the lab. This position will report directly to the Server Cooling Product Manager and the right candidate will be hands‑on, self‑directed, and comfortable owning a design across engineering, manufacturing, suppliers, and customer teams.

Role Responsibilities:

Design and CAD (70%)

• Review thermal engineers’ concept and first-prototype designs to confirm a path to manufacturability
• Translate first-prototype server liquid cooling assemblies for GPU and CPU platforms into production-ready designs, including cold plate loops, tubing and hose routing, manifolds, fittings, and quick disconnects, within the space, serviceability, and interface constraints of OEM server chassis
• Design pressure boundaries: select materials, joining methods, and fittings; establish design, proof, and burst pressures; confirm compatibility with the working fluid
• Partner with thermal engineers on plumbing sizing, pressure drop, and flow distribution, contributing packaging constraints, component selection, and manufacturability input to their analysis
• Perform FEA to evaluate deformation and stress in pressure-containing parts and assemblies
• Produce production-ready 3D models, drawings with GD&T, and BOMs; manage revisions through ECOs in our PLM system
• Work with cold plate suppliers, braze shops, and fabricators from RFQ through first article; drive DFM and resolve supplier issues
• Lead design reviews and mentor early-career engineers on server plumbing design
• Support OEM and customer engagements with integration drawings and interface specifications

Test and Validation Support (30%)

• Define test requirements and acceptance criteria for pressure, leak, flow, and pressure drop testing
• Define requirements for test fixtures and hardware, and review the manufacturing team’s fixture designs against them
• Support R&D technicians in building and running tests on our R&D test rigs
• Review test data, lead root cause investigations on failures, and carry findings into the next design revision

Qualifications for this role include:

• 5+ years of experience with progressively increasing responsibility
• Bachelor’s degree in mechanical engineering or similar required
• Direct experience designing liquid cooling hardware for data center servers or racks required (single-phase or two-phase)
• Demonstrated design of pressure-containing fluid systems: joint design, fitting selection, material selection, pressure rating, and leak testing
• Working knowledge of fluid mechanics and heat transfer sufficient to collaborate with thermal engineers on sizing and performance; CFD and thermal specialization not required
• Proficiency in a parametric 3D CAD tool (SolidWorks preferred) and producing manufacturing drawings with GD&T
• FEA experience evaluating structural deformation and stress in mechanical parts
• Record of taking designs through fabrication and release with external suppliers
• Takes ownership, communicates clearly, and works across disciplines
• Startup experience is a plus

Preferred Experience:

• Working with cold plate vendors and brazing manufacturers
• HVAC, refrigeration, or hydronic systems design
• Cold plate and fluid-component manufacturing processes: brazing, skiving, friction stir welding, machining
• Familiarity with OCP liquid cooling specifications, ASHRAE liquid cooling guidelines, and IEC/UL 62368-1 requirements for liquid-filled components
• ECO and configuration management in a PLM system

Accelsius offers a competitive salary with equity, a full range of benefits including medical and dental, 401K, and flexible PTO.

The position is based in Austin, Texas.

This position includes the responsibilities outlined above and may also encompass additional duties as assigned to meet business and compliance needs.

Accelsius does not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity or expression, national origin, age, disability, veteran status, marital status, or based on an individual's status in any group or class protected by applicable federal, state or local law. Accelsius encourages applications from minorities, women, the disabled, protected veterans, and all other qualified applicants.