Orange Recruitment is seeking a Building Services Design Engineer to join our client's Dublin-based Engineering & Design Team. This is an excellent opportunity for a technically capable, solutions-driven engineer to play a key role in the design, optimisation, and delivery of high-performance mechanical building services systems across a diverse range of commercial, industrial, and institutional projects. Working as part of a collaborative design team, you will be responsible for developing innovative, energy-efficient mechanical solutions, including HVAC, ventilation, heating, cooling, and public health systems, ensuring compliance with design standards, regulations, and project requirements. Responsibilities: Develop detailed mechanical building services designs, including HVAC, ventilation, hydronic systems, public health services, and specialist mechanical plant in accordance with relevant standards and best practice. Produce design calculations using recognised engineering tools covering airflow, heat load, psychrometrics, pressure drops, pipe and duct sizing, and system performance modelling. Prepare coordinated technical drawings, schematics, schedules, and specifications in collaboration with BIM and CAD teams. Assist in the development of energy-efficient and sustainable design strategies, optimising system layouts and equipment selections to meet project performance goals. Review design information, identify risks or coordination challenges, and propose engineering solutions to ensure buildability and compliance. Participate in design team meetings, technical workshops, and coordination sessions with architects, structural engineers, contractors, and other stakeholders. Support the tender and procurement process by preparing technical submissions, evaluating mechanical equipment proposals, and reviewing supplier documentation. Carry out site visits to verify design intent, review installations, and support commissioning activities when required. Ensure all design documentation meets regulatory requirements, internal quality standards, and project-specific technical criteria. Contribute to continuous improvement of design processes, engineering standards, and technical innovation across the mechanical building services discipline. Engage in ongoing CPD activities to maintain and enhance professional and technical expertise. Requirements: Minimum 3 years' experience in mechanical or building services design within a consultancy, contractor, or design-build environment (essential). Strong technical understanding of HVAC engineering, including airflow, ventilation principles, cooling/heating loads, psychrometrics, and system controls. Proficient in producing calculations, system sizing, and performance assessments using industry-standard design software (e.g., Hevacomp, IES, HAP, or similar). Ability to interpret and develop technical drawings, schematics, BIM models, and specifications. Strong knowledge of Irish, UK, and European building regulations, standards, and guidelines related to mechanical services. Competent in reviewing equipment selections, performance data, and supplier technical submissions. Excellent analytical and problem-solving skills with strong attention to detail. Proficiency with digital tools including Excel, design software, and project coordination applications. Degree or higher qualification in Mechanical Engineering, Building Services Engineering, or a related discipline (preferred).