Mechanical Design Engineer

T etra Tech is looking for a Mechanical Design Engineer to design the infrastructure that powers the energy transition. Purpose & Scope of the Role We are looking for a Mechanical Design Engineer to support the delivery of technically complex mechanical and pipeline design across energy and utilities projects. This role focuses on gas, district heating, biomethane, hydrogen and wider buried and above-ground infrastructure. You will contribute to preliminary and detailed design, calculations, reporting, options assessment and project delivery support, working closely with senior engineers, clients and multidisciplinary teams. Day to day, you will help shape practical, compliant and sustainable design solutions that meet client requirements, planning constraints and applicable standards. This is a Dublin-based role within a growing Energy and Utilities team of around 50 people, including a district gas heating sub-team of approximately 10. The portfolio covers regulated and technically demanding projects for major utility clients, ranging from feasibility and pre-FEED studies through to detailed design, delivery support and remediation works. The role is suited to someone with around three to five years’ experience, although candidates with up to around ten years’ relevant experience may also be considered where they bring strong technical and delivery capability. Your Impact in this position In the short term, you will build confidence in technical delivery, deepen your knowledge of relevant standards and gain direct exposure to client-facing work on significant infrastructure projects. In the medium term, you will take greater ownership of work packages, support project coordination, lead smaller commissions and strengthen your report writing and decision-support skills. Over the longer term, you can progress into broader project management and technical leadership roles, while contributing to innovative, sustainability-led work that supports Ireland’s energy transition and critical infrastructure resilience. Core Capabilities Technical Mechanical Design You will bring solid mechanical engineering capability, with the ability to design pipes, pipelines and associated infrastructure for gas, heat and utility networks. You will be confident carrying out calculations and developing solutions for flow rates, pressures, wall thickness, thermal loading, velocity, buffer volumes and load conditions. You will be able to turn technical requirements into practical, compliant and buildable design outputs. Engineering Standards and Analytical Thinking You will apply relevant codes and guidance with confidence, using them to inform sound design decisions. You will be comfortable assessing technical risk, checking assumptions, verifying calculations and identifying issues early. You will translate analysis into clear, sensible recommendations for clients and project teams. Reporting, Documentation and Technical Communication You will produce high-quality reports, options appraisals, project updates and supporting documentation for planning and regulatory purposes. You will communicate complex engineering information clearly to technical and non-technical audiences. You will contribute confidently in meetings, take accurate notes where needed and present design intent with clarity. Multidisciplinary Coordination and Project Support You will work effectively across mechanical, civil, electrical, geotechnical and environmental disciplines. You will support design coordination, document control, programme tracking and project meetings to keep work moving smoothly. You will bring strong organisation and a proactive approach to managing concurrent project demands. Client Engagement, Professional Judgement and Development Mindset You will be comfortable in a client-facing environment and able to build trusted working relationships. You will support senior colleagues in meetings and progressively take on more responsibility in client interaction and decision support. You will show a collaborative mindset, openness to feedback and a commitment to continuous development. Training, Qualifications and Experience A degree in Mechanical Engineering, or a closely related discipline, is essential, along with around three to five years’ relevant post-graduate experience in mechanical, utilities or infrastructure engineering. Strong written and spoken English is required. Chartered status, or active progress towards it, would be an advantage, as would experience in gas, district heating, water, hydrogen or biomethane projects. Familiarity with AutoCAD, 3D modelling, stress analysis tools or similar engineering software would also be beneficial. Working Environment This is a Dublin-based role with hybrid working available. During probation, full-time office attendance is expected. Once probation is complete, the usual pattern is two to three days in the office each week, with the remainder worked flexibly in line with project needs. Occasional site visits, client meetings and attendance at project locations will be required. Flexible working may be considered, but the role is primarily office-based and is not suitable for fully remote working. #LI-LD1 #LI-HYBRID