Senior Mechanical Engineer - Data Centre

The ORS Group; Ireland; Hybrid; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Competitive salary

Bonus scheme

Pension matching

Remote-first hybrid model

Work from abroad

Flexible hours

CPD funding

Maternity/Paternity leave

Paid leave entitlement

Job summary

The ORS Group in Ireland is seeking a Senior Mechanical Engineer – Data Centre to lead technical reviews of mission-critical mechanical systems on large hyperscale projects. You’ll act as the client’s SME, ensuring designs, construction, commissioning and handover meet the highest standards.

This role is client-facing and focuses on leadership over drawing production. You will review designs, identify risks, and drive best practices for cooling, ventilation, BMS integration, fuel and generator

Qualifications

• Degree in Mechanical Engineering or Building Services.
• Chartered Engineer status or working towards chartership.
• 10+ years' experience in building services or data centre environments.
• Strong knowledge of chilled water, CRAH/AHU, and cooling infrastructure.

Responsibilities

• Lead independent technical reviews of mission-critical mechanical systems.
• Review design packages, calculations, specifications and reports.
• Assess systems for constructability, maintainability, resilience, and operational suitability.
• Review contractor submittals, shop drawings, and method statements.
• Support RFIs and technical queries.
• Participate in multidisciplinary design reviews and workshops.
• Carry out site inspections and construction quality reviews.
• Review commissioning plans and witness testing activities.
• Participate in FAT, IST, and commissioning reviews.
• Support risk management and issue resolution.
• Review as-built drawings, O&M manuals, and handover docs.
• Provide technical guidance to project teams and client stakeholders.

Skills

Chilled water systems

CRAH and AHU systems

Cooling infrastructure

Generator cooling systems

Fuel systems

Ventilation and exhaust systems

BMS integration

Commissioning processes

Stakeholder management

Technical leadership

Education

Bachelor's degree in Mechanical Engineering or Building Services

Chartered Engineer status or working towards chartership

Job description

About the Role

As one of Ireland's most progressive and people-focused building consultancies, we are expanding our team with an experienced Senior Mechanical Engineer – Data Centre to support the delivery of major hyperscale data centre developments in Ireland.

This is a unique opportunity to move into a client-facing technical leadership role where your focus is not on producing design drawings, but on ensuring that complex mission-critical infrastructure is designed, constructed and commissioned to the highest standards.

You'll join a multidisciplinary team providing independent technical review, Employer's Representative services, QA/QC oversight, commissioning support and operational readiness services on large-scale data centre developments.

Working directly with developers, contractors, commissioning teams and specialist vendors, you will be a key part of the team protecting design quality, resilience, maintainability and long-term operational performance.

You will provide technical oversight across the full project lifecycle, from design development through construction, commissioning, and handover. Acting as the client's mechanical subject matter expert, you will review designs, identify risks, challenge assumptions, and help ensure mechanical systems are delivered in line with project requirements and operational expectations.

You will work closely with contractors, consultants, commissioning providers, equipment vendors, and client stakeholders to support the successful delivery of mission-critical projects.

Key Responsibilities

• Lead independent technical reviews of mission-critical mechanical systems
• Review design packages, calculations, specifications, and technical reports
• Assess systems for constructability, maintainability, resilience, and operational suitability
• Review contractor technical submissions, shop drawings, and method statements
• Support the resolution of RFIs and technical queries.
• Participate in multidisciplinary design reviews and technical workshops
• Carry out site inspections and construction quality reviews
• Review commissioning plans and witness key testing activities
• Participate in Factory Acceptance Testing (FAT), Integrated Systems Testing (IST), and commissioning reviews
• Support technical risk management and issue resolution
• Review as-built drawings, O&M manuals, and project handover documentation
• Provide technical guidance and support to project teams and client stakeholders

Essential Requirements

• Degree in Mechanical Engineering, Building Services Engineering, or a related discipline
• Chartered Engineer status or working towards chartership
• 10+ years' experience in building services, mission-critical, data centre, or similar environments
• Strong knowledge of:
  • Chilled water systems
  • CRAH and AHU systems
  • Cooling infrastructure
  • Generator cooling systems
  • Fuel systems
  • Ventilation and exhaust systems
  • BMS integration
  • Commissioning processes

• Experience reviewing contractor designs, technical submissions, and engineering documentation
• Excellent communication, stakeholder management, and problem-solving skills
• Ability to build effective working relationships with contractors, consultants, commissioning teams, and client stakeholders

Desirable Requirements

• Experience delivering data centre projects
• Experience participating in FAT, SAT, and IST activities
• QA/QC or Employer's Representative experience
• Experience working within hyperscale or colocation environments
• Operational readiness or commissioning experience

What We Can Offer You

Being part of ORS means more than just a job, it means joining a company that invests in you and your ambitions with transparency, structure and support.

We are delighted to offer a suite of benefits when you join ORS, which include:

• Competitive salary
• Performance-related bonus
• Pension scheme with matching contributions
• Remote-first hybrid model – use your home as a base and any of our office locations as you see fit
• Work from abroad
• Flexible working hours
• Access to over 60 health disciplines through our Kara Connect Platform
• Continuous Professional development (CPD) programme & funding
• Paid maternity, paternity and fertility leave
• Company and birthday annual leave days
• Death in Service benefit
• Tax saver - travel and bike to work
• Culture, social, wellness and CPD committees
• Talent Development Programmes
• Access to leading career coach Gerry Duffy

About ORS

ORS is a world-class multidisciplinary building consultancy with more than 30 years of delivering technical excellence across the built environment. Our mission is simple but powerful: We endeavour to make the lives of our team, clients, partners and communities happier and better in the ways that really matter every single day.

Don’t just take our word for it! ORS has won numerous awards, recognising our Great Place to Work culture.

• Ranked 27th Best Small & Medium Workplace in Europe, Great Place to Work 2026
• Winner of Best Workplace for Remote & Distributed Teams, Workplace Excellence Awards 2026
• Winner of HR Team of the Year, Workplace Excellence Awards 2026
• Winner of Best Workplace for Diversity, Equity & Inclusion, Workplace Excellence Awards 2026
• Winner of Consultancy Firm of the Year, Irish Design & Build Awards 2026
• Winner of Engineering Consultancy of the Year, Engineering Excellence Awards 2025
• Winner of Graduate Programme of the Year, Engineering Excellence Awards 2025
• Winner of Best Company to Work For, Irish Design & Build Awards 2024 & 2025
• Top 3 Medium-Sized Company, Great Place to Work Awards 2025
• Best Workplace for Health & Wellbeing, Great Place to Work 2025
• Silver Accreditation, Investors in Diversity 2025
• Winner of Best People Development of the Year, Engineering Excellence Awards 2024
• Winner of Recruitment & Retention Strategy, Workplace Excellence Awards 2024
• Great Place to Work Certified consecutively since 2017
• Engineers Ireland CPD Accredited since 2017

ORS is committed to creating a diverse and inclusive company culture. We foster a culture of inclusion for all employees that respects and supports their individual strengths and experiences.