DC MECHANICAL DESIGN ENGINEER

About RHAELM RHAELM is the sovereign AI cloud built to accelerate secure AI deployment at scale, combining power and infrastructure pipelines with global capability and local, in-country operations. Headquartered in London, with deployments across Europe and APAC, we deliver ring-fenced compute, networking, and storage infrastructure alongside a sovereign platform and flexible Bare Metal, Kubernetes, and AI-as-a-Service models.

Focused on regulated and mission-critical sectors including Government, Defence, Healthcare, and Financial Services, we give organisations sovereign control over their AI infrastructure, platform, and data. This Role This role is based in Tokyo, Japan, leading mechanical design across RHAELM's Japan data centre programme.

As DC Mechanical Design Engineer, you will develop and design the cooling, HVAC, and mechanical infrastructure that keeps RHAELM's data centres running reliably and efficiently. You will work across concept through detailed design, collaborating with electrical, structural, and ICT teams to deliver high-density cooling solutions that meet the demands of mission-critical, sovereign infrastructure.

Key Responsibilities

• Develop concept and detailed designs for HVAC, cooling, fire protection, plumbing, and ventilation systemsDesign high-density cooling solutions for critical facilities, including air and liquid cooling strategiesConduct thermal load calculations, CFD analysis, and airflow optimisationOptimise critical cooling systems for energy efficiency, redundancy, and sustainabilityReview and approve Basis of Design (BOD), technical specifications, and compliance reportsCollaborate with electrical, structural, and ICT teams to ensure seamless multidisciplinary integrationGuide equipment selection, ensuring adherence to reliability and redundancy requirementsProvide technical support during construction, installation, and commissioning phases Experience Proven mechanical design experience, with a strong emphasis on data centre or critical facility projectsExperience with chilled water systems, CRAC/CRAH units, and mechanical cooling plant designFamiliarity with Tier Standard Topology and relevant international standards (ASHRAE, ISO, NFPA)Experience supporting design reviews at key project milestonesExperience working with BIM technicians and reviewing coordinated design outputExperience operating within Japan's construction, engineering, or regulatory market context advantageous Skills Strong knowledge of HVAC, critical cooling, and mission-critical mechanical systemsProficiency in CFD analysis, thermal modelling, and energy simulation toolsHands-on experience with 3D modelling software (AutoCAD, Revit MEP, Navisworks)Effective cross-discipline coordination and stakeholder communicationStrong problem-solving and analytical capability Qualifications Degree in Mechanical Engineering or a related disciplineProfessional Engineer status or working towards chartership advantageousRelevant design software certifications a plusBased in Tokyo, Japan;
• business-level English required, Japanese language skills advantageous