Senior Mechanical Engineer - Data Centre

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.