Principal Mechanical Engineer

Principal Mechanical Engineer Location(s): Dublin with occasional travel to project sites and other office locations as required.

Join Us in Shaping the Future of Building Services Engineering We are seeking a Principal Mechanical Engineer to play a key role in delivering complex, high-value projects across buildings, infrastructure, industrial and renewable energy sectors. This is an opportunity to apply senior technical expertise within a collaborative multidisciplinary environment, helping shape innovative, compliant and efficient mechanical solutions on nationally significant programmes.

Purpose & Scope of the Role As Principal Mechanical Engineer, you will provide senior-level mechanical engineering expertise across projects from concept through to handover. You will lead the development of mechanical design solutions, support technical decision-making, and ensure all outputs meet relevant regulations, standards and best practice.

The role includes preparing feasibility studies incorporating EED principles, scheme design drawings and reports, detailed design packages, specifications, equipment data sheets, cost estimates, tender support, construction and commissioning/validation monitoring, and handover. You will work closely with clients, architects, project managers and internal teams to deliver high-quality outcomes.

Your Impact in This Position You will take ownership of significant mechanical work packages and contribute directly to the successful delivery of major projects valued from €1 million to €200 million. Your expertise will help shape robust, efficient design solutions, strengthen client relationships, and support the development of early-career engineers.

You will also have the opportunity to influence project leadership, contribute to team growth, and progress toward greater responsibility at Associate level.

Core Capabilities Technical Expertise in Mechanical Building Services Extensive experience in the design of mechanical systems for buildings, including heating, cooling, ventilation, public health and BMS. Strong technical judgement, with the ability to develop compliant, efficient solutions and apply Irish regulations, codes, standards and design safety principles.

Software Experience Knowledge of thermal modelling software such as IES, mechanical design/calculation software, and detailed calculation spreadsheets. Experience delivering projects in a BIM environment.

Multi-Sector Experience Proven track record in the design and coordination of mechanical building services engineering projects across commercial, industrial, infrastructure, pharmaceutical, educational, healthcare and residential sectors.

Communications & Soft Skills Ability to manage multiple tasks and projects while maintaining high-quality outputs. Excellent communication, organisation and problem-solving skills, with experience working effectively in multidisciplinary teams.

Leadership and Collaboration Ability to build strong working relationships with clients and project partners, while supporting, guiding and developing junior and early-career engineers.

Qualifications & Experience Expected

• Degree in Mechanical Engineering or an equivalent discipline
• Minimum 7 years’ experience in mechanical building services design
• Proven experience in the design and coordination of mechanical building services engineering projects within multidisciplinary teams
• Proficiency in digital design tools and standard software systems
• Experience in complex industrial or manufacturing facilities desirable

Beneficial

• Chartered Engineer status, or evidence of progress towards chartership

Working Environment This role is based in Dublin, within a wider team operating across Dublin, Cork and Galway. Flexible and part-time working options are available, with working patterns agreed collaboratively between employees and line managers to support wellbeing and performance. Reasonable adjustments can be made to support candidates and employees where needed.

Why join Tetra Tech? Tetra Tech is a leading provider of consulting and engineering services working across the full project lifecycle worldwide. We have a wide range of expertise across our teams, providing a global support network with a personalised approach to client relationships to better understand where we can add value. We provide a collaborative environment that supports individual performance, innovation, and creativity.

W e support public and private sector clients on local, national, and international projects to deliver sustainable and resilient solutions. Our operations in the UK, Ireland, and the Netherlands include more than 6,000 employees who are Leading with Science® to solve our clients’ most complex problems.

In alignment with the Equality Act 2010, we will make reasonable adjustments to support candidates and employees requiring additional arrangements. This could include adaptations to work schedules, training approaches, or the physical workspace. Please inform us if you need any accommodations during the recruitment process or in your day-to-day role.

Recruitment Agencies We have a Preferred Supplier List of trusted partners to assist us when required and do not acknowledge any speculative CVs or unsolicited candidate introductions from agencies not on this list and any submitted will be taken as a gift. Please refer to the careers page on our website if you require any further information.