Design Engineer – CDU (Coolant Distribution Unit)

Stealth AI Startup; India; On-site; INR 1,200,000 - 2,400,000; Full time

Job summary

Stealth AI Infrastructure Startup in India is seeking a Design Engineer – CDU to own the mechanical design and development of Coolant Distribution Units for high‑density AI/hPC data centers.

You will take CDU concepts from CAD design through prototype testing to pilot production, collaborating with thermal, CFD, electrical, and manufacturing teams to optimize flow, pressure, and heat transfer while emphasizing DFM/DFA, reliability, and cost.

Qualifications

• Bachelor's or master’s degree in mechanical/thermal/aerospace or related field.
• 4–8 years of mechanical/product design experience in thermal/fluid systems.
• Strong fundamentals in heat transfer, thermodynamics, and hydraulic systems.
• Hands-on experience with 3D CAD and 2D manufacturing drawings.

Responsibilities

• Design and develop Coolant Distribution Units (CDUs) for high-density AI/HPC data centers.
• Develop mechanical architecture for CDU systems including pumps, heat exchangers, valves, manifolds, filters, expansion tanks, sensors, piping, fittings, and control components.
• Create detailed 3D CAD models, assemblies, drawings, BOMs, and manufacturing documentation.
• Develop and maintain P&IDs, system schematics, flow diagrams, and mechanical layouts.
• Perform thermal and hydraulic calculations for flow rate, pressure drop, heat load, and pump sizing.
• Select and evaluate pumps, heat exchangers, valves, sensors, actuators, hoses, and other components.
• Design manifolds, piping systems, brackets, enclosures, frames, and sheet-metal components.
• Work with CFD/thermal teams to optimize CDU flow distribution and thermal performance.
• Incorporate DFM/DFA, serviceability, reliability, and cost into designs.
• Develop prototypes and coordinate with vendors and manufacturing teams.
• Conduct pressure, leak, flow, thermal, vibration, and functional testing.
• Analyze test results and implement design improvements.
• Prepare drawings, specifications, BOMs, test procedures, and validation reports.

Skills

3D CAD

SolidWorks

Creo

NX

CATIA

Hydraulic Systems

Thermal Management

Education

B.E./B.Tech/M.Tech in Mechanical Engineering or related

Tools

P&ID / fluid-system design

2D drawings, GD&T

Flow/thermal calculation tools

Job description

Role : Design Engineer – CDU (Coolant Distribution Unit)

Experience: 2–8 Years

Company: Stealth AI Infrastructure Startup

About the Role

We are building next-generation liquid cooling infrastructure for AI Data Centers, enabling high-density GPU, HPC, and accelerated computing environments.

We are looking for a Design Engineer – CDU to own the mechanical design and product development of Coolant Distribution Units (CDUs) and associated liquid-cooling systems.

This role will work across concept development, CAD design, thermal and hydraulic engineering, component selection, prototyping, testing, DFM/DFA, and manufacturing to take CDU products from engineering concept to production.

Key Responsibilities

• Design and develop Coolant Distribution Units (CDUs) for high-density AI/HPC data centers.
• Develop mechanical architecture for CDU systems including pumps, heat exchangers, valves, manifolds, filters, expansion tanks, sensors, piping, fittings, and control components.
• Create detailed 3D CAD models, assemblies, drawings, BOMs, and manufacturing documentation.
• Develop and maintain P&IDs, system schematics, flow diagrams, and mechanical layouts.
• Perform thermal and hydraulic calculations for flow rate, pressure drop, heat load, heat exchanger sizing, pump selection, and system performance.
• Select and evaluate pumps, heat exchangers, valves, sensors, actuators, quick disconnects, hoses, pipes, and other fluid-system components.
• Design manifolds, piping systems, brackets, enclosures, frames, and sheet-metal/fabricated components.
• Work with CFD/thermal engineering teams to optimize CDU flow distribution, pressure drop, heat transfer, and thermal performance.
• Design products considering Design for Manufacturing (DFM), Design for Assembly (DFA), serviceability, reliability, and cost.
• Develop prototypes and coordinate with vendors and manufacturing teams for fabrication and assembly.
• Conduct pressure, leak, flow, thermal, vibration, and functional testing of CDU prototypes.
• Analyze test results and implement design improvements through iterative engineering cycles.
• Prepare engineering documentation including drawings, specifications, BOMs, test procedures, validation reports, and design change documentation.
• Work closely with thermal, electrical, controls, manufacturing, quality, sourcing, and product teams.
• Support transition of CDU designs from prototype to pilot production and mass manufacturing.
• Evaluate suppliers and review manufacturing capabilities for pumps, heat exchangers, manifolds, piping, sheet metal, machining, welding, and other components.
• Support root-cause analysis and resolution of field and prototype failures.

Required Qualifications

• B.E./B.Tech/M.Tech in Mechanical Engineering, Thermal Engineering, Aerospace Engineering, Energy Engineering, or a related discipline.
• 4–8 years of experience in mechanical/product design, thermal systems, fluid systems, HVAC, heat exchangers, electronics cooling, or related engineering domains.
• Strong fundamentals in:
• Heat Transfer
• Thermodynamics
• Hydraulic Systems
• Thermal Management
• Mechanical Design
• Strong hands‑on experience with 3D CAD such as SolidWorks, Creo, Siemens NX, CATIA, or equivalent.
• Experience creating 2D manufacturing drawings, GD&T, BOMs, assemblies, and engineering documentation.
• Experience with P&ID / fluid-system design and selection of fluid-system components.
• Understanding of pressure drop, flow distribution, pump curves, heat exchanger performance, and system‑level thermal calculations.
• Experience working with manufacturing vendors and converting engineering designs into physical prototypes.
• Strong problem‑solving and analytical skills.
• Ability to work hands‑on in a fast‑paced product‑development environment.

Preferred Experience

Experience in one or more of the following areas will be highly valuable:

• Data Center Cooling
• AI / HPC Infrastructure
• Cold Plate Design
• Electronics / Semiconductor Cooling
• Pump and Hydraulic System Design
• Manifold and Piping Design
• Sheet Metal / Fabrication / Machining
• DFM / DFA
• CFD using ANSYS Fluent, STAR‑CCM+, COMSOL, or equivalent
• Experience with water‑glycol or other engineered coolant systems
• Experience with quick disconnects, hoses, fittings, valves, sensors, and fluid connectors

Technical Skills

Mechanical Design:

SolidWorks / Creo / NX / CATIA

Thermal calculations, hydraulic calculations, pressure‑drop analysis, pump sizing, heat exchanger sizing

Simulation:

ANSYS Fluent / STAR‑CCM+ / COMSOL or equivalent

GD&T, 2D drawings, BOM, P&ID, assembly drawings, design specifications

Manufacturing:

Machining, sheet metal, welding, brazing, fabrication, DFM/DFA and prototype development

What You’ll Build

You will work on the engineering of next‑generation CDU platforms designed to support high‑density GPU and AI infrastructure.

You will have the opportunity to work across the complete product lifecycle — from concept and CAD design to prototype, testing, manufacturing, and deployment.

Why Join Us?

• Build next‑generation liquid cooling technology for AI Data Centers.
• Work on products designed for high‑density GPU and HPC infrastructure.
• Solve challenging problems across thermal engineering, fluid dynamics, mechanical design, and manufacturing.
• Work directly on real hardware and prototypes, not just simulations.
• High ownership and opportunity to influence the product architecture.
• Work alongside experienced engineers across AI infrastructure, thermal engineering, mechanical design, and manufacturing.
• Opportunity to build products for the rapidly growing AI infrastructure and data center market.