Lead Mechanical Engineer, Data Center Design

About Fluidstack

We exist to make humanity more free. For most of human history, you farmed or you starved. Technology gave people more time for the things they wanted to do, instead of things they had to do. Powerful AI will be the biggest lever for human choice we've ever built - but only if models are aligned with what humanity actually wants. There are groups building AI who don't share these goals. Whoever deploys frontier compute infrastructure fastest will decide whether AI expands human freedom or shrinks it. We're singularly focused on delivering 10 to 100s of GWs of compute faster than anyone else, rethinking every layer of the stack. We acquire power, design and build data centers, and operate them - with teams spanning hardware and software. Speed and scale are our key differentiators. Come be a part of building civilization-scale infrastructure for AI. We hire people who care deeply about this problem space. If that is you, please apply!

About Fluidstack

We exist to make humanity more free. For most of human history, you farmed or you starved. Technology gave people more time for the things they wanted to do, instead of things they had to do. Powerful AI will be the biggest lever for human choice we've ever built - but only if models are aligned with what humanity actually wants. There are groups building AI who don't share these goals. Whoever deploys frontier compute infrastructure fastest will decide whether AI expands human freedom or shrinks it. We're singularly focused on delivering 10 to 100s of GWs of compute faster than anyone else, rethinking every layer of the stack. We acquire power, design and build data centers, and operate them - with teams spanning hardware and software. Speed and scale are our key differentiators. Come be a part of building civilization-scale infrastructure for AI. We hire people who care deeply about this problem space. If that is you, please apply!

About the Role

The Lead Mechanical Engineer is a senior technical leader within FluidStack’s Design and Engineering team. You will define the mechanical cooling strategy and own the programmatic design from chip to chiller across a multi-site, multi-state portfolio of some of the world’s largest AI data centers. This is an owner/developer role. You will set the technical direction for how FluidStack cools tens of thousands of GPUs – spanning air-cooled and liquid-cooled architectures, chilled water systems, heat rejection, and in-row/in-rack thermal management. You will define the requirements for modular, prefabricated mechanical assemblies designed around rapid deployment and compute-refresh flexibility. You will manage a growing mechanical engineering team and coordinate across electrical, controls, structural, and construction disciplines to deliver cooling infrastructure at unprecedented speed and scale. We recently announced a $50 billion computing infrastructure partnership with Anthropic, building custom data centers in New York and Texas with more sites to come. This role will shape the mechanical systems that make that possible.

About the Role

The Lead Mechanical Engineer is a senior technical leader within FluidStack’s Design and Engineering team. You will define the mechanical cooling strategy and own the programmatic design from chip to chiller across a multi-site, multi-state portfolio of some of the world’s largest AI data centers. This is an owner/developer role. You will set the technical direction for how FluidStack cools tens of thousands of GPUs – spanning air-cooled and liquid-cooled architectures, chilled water systems, heat rejection, and in-row/in-rack thermal management. You will define the requirements for modular, prefabricated mechanical assemblies designed around rapid deployment and compute-refresh flexibility. You will manage a growing mechanical engineering team and coordinate across electrical, controls, structural, and construction disciplines to deliver cooling infrastructure at unprecedented speed and scale. We recently announced a $50 billion computing infrastructure partnership with Anthropic, building custom data centers in New York and Texas with more sites to come. This role will shape the mechanical systems that make that possible.

Required Qualifications

• B.S. in Mechanical Engineering or equivalent technical discipline. • 10+ years of experience designing mechanical/cooling systems for data centers, with significant exposure to hyperscale or high-performance computing facilities. • Deep technical knowledge of chilled water systems, air-cooled and water-cooled chillers, direct liquid cooling, and heat rejection plant design. • Experience leading or managing a mechanical engineering team and directing external MEP consultants through a full design lifecycle. • Working command of ASHRAE TC 9.9 thermal guidelines, liquid cooling best practices, and relevant mechanical codes (IMC, ASME, NFPA). • Demonstrated ability to develop and enforce design standards, basis of design documents, and master specifications across a multi-site portfolio. • Strong vendor network and procurement experience across chillers, pumps, piping, and cooling distribution equipment. • Willingness to travel to project sites across the US (estimated 20–30%).

Required Qualifications

• B.S. in Mechanical Engineering or equivalent technical discipline. • 10+ years of experience designing mechanical/cooling systems for data centers, with significant exposure to hyperscale or high-performance computing facilities. • Deep technical knowledge of chilled water systems, air-cooled and water-cooled chillers, direct liquid cooling, and heat rejection plant design. • Experience leading or managing a mechanical engineering team and directing external MEP consultants through a full design lifecycle. • Working command of ASHRAE TC 9.9 thermal guidelines, liquid cooling best practices, and relevant mechanical codes (IMC, ASME, NFPA). • Demonstrated ability to develop and enforce design standards, basis of design documents, and master specifications across a multi-site portfolio. • Strong vendor network and procurement experience across chillers, pumps, piping, and cooling distribution equipment. • Willingness to travel to project sites across the US (estimated 20–30%).

Preferred Qualifications

• Professional Engineer (PE) license or Chartered Engineer credential. • Direct experience with modular or prefabricated mechanical system design and off-site manufacturing coordination. • Hands-on CFD experience (6SigmaET, Ansys Icepak, Flotherm) and proficiency with Revit/BIM workflows. • Experience with medium-voltage (4.16 kV+) chiller applications and 800VDC power distribution architectures in data centers. • Background in owner/developer-side roles (vs. pure consultant or EPC) with direct accountability for system performance and reliability. • Experience commissioning large-scale chilled water plants, including chemical treatment, flushing programs, and hydraulic balancing. • Familiarity with FM Global requirements for mechanical systems in mission-critical facilities. • Exposure to AI/HPC-specific cooling challenges: high rack densities (75–150+ kW), GPU thermal management, and compute-refresh-ready infrastructure.

Preferred Qualifications

• Professional Engineer (PE) license or Chartered Engineer credential. • Direct experience with modular or prefabricated mechanical system design and off-site manufacturing coordination. • Hands-on CFD experience (6SigmaET, Ansys Icepak, Flotherm) and proficiency with Revit/BIM workflows. • Experience with medium-voltage (4.16 kV+) chiller applications and 800VDC power distribution architectures in data centers. • Background in owner/developer-side roles (vs. pure consultant or EPC) with direct accountability for system performance and reliability. • Experience commissioning large-scale chilled water plants, including chemical treatment, flushing programs, and hydraulic balancing. • Familiarity with FM Global requirements for mechanical systems in mission-critical facilities. • Exposure to AI/HPC-specific cooling challenges: high rack densities (75–150+ kW), GPU thermal management, and compute-refresh-ready infrastructure.

Salary & Benefits

• Competitive total compensation package (cash + equity). • Retirement or pension plan, in line with local norms. • Health, dental, and vision insurance. • Generous PTO policy, in line with local norms. The base salary range for this position is $300,000 - $350,000 per year, depending on experience, skills, qualifications, and location. This range represents our good faith estimate of the compensation for this role at the time of posting. Total compensation may also include equity in the form of stock options. We are committed to pay equity and transparency. Fluidstack is an Equal Employment Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability and protected veterans’ status, or any other characteristic protected by law. Fluidstack will consider for employment qualified applicants with arrest and conviction records pursuant to applicable law. You will receive a confirmation email once your application has successfully been accepted. If there is an error with your submission and you did not receive a confirmation email, please email careers@fluidstack.io with your resume/CV, the role you've applied for, and the date you submitted your application-- someone from our recruiting team will be in touch.

Salary & Benefits

• Competitive total compensation package (cash + equity). • Retirement or pension plan, in line with local norms. • Health, dental, and vision insurance. • Generous PTO policy, in line with local norms. The base salary range for this position is $300,000 - $350,000 per year, depending on experience, skills, qualifications, and location. This range represents our good faith estimate of the compensation for this role at the time of posting. Total compensation may also include equity in the form of stock options. We are committed to pay equity and transparency. Fluidstack is an Equal Employment Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability and protected veterans’ status, or any other characteristic protected by law. Fluidstack will consider for employment qualified applicants with arrest and conviction records pursuant to applicable law. You will receive a confirmation email once your application has successfully been accepted. If there is an error with your submission and you did not receive a confirmation email, please email careers@fluidstack.io with your resume/CV, the role you've applied for, and the date you submitted your application-- someone from our recruiting team will be in touch.

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