Senior Mechanical Engineer Due to a growing pipeline of work, HDR is seeking a Senior Mechanical Engineer to join our Building Engineering Services team based in Sydney. This role will play a key part in the design, coordination and delivery of building services projects within a multidisciplinary consulting environment. You will operate as a senior technical contributor, taking ownership of defined scopes of work with minimal supervision while working closely with discipline leads and project leadership. Working collaboratively with our national Building Engineering Services team this is a delivery‑focused position suited to an engineer who enjoys hands‑on design and contributing to high‑quality, technically robust engineering solutions across the full project lifecycle. Responsibilities Delivering building services design packages from concept through to construction. Undertaking detailed engineering calculations, design development and system selection. Producing coordinated, compliant drawings, reports and specifications. Ensuring designs meet Australian codes, standards and regulatory requirements. Coordinating discipline inputs and resolving design interfaces. Supporting construction‑phase activities including inspections and technical queries. Contributing to technical improvement initiatives and best practice. Qualifications & Experience Bachelor’s degree in mechanical engineering. Typically 6–12 years’ experience in building services design within a consulting environment. Consulting experience is essential. Chartered Professional Engineer (CPEng) – advantageous. Demonstrated ability to deliver complete design packages with minimal supervision. Strong background in building services design of data centers, commercial, industrial, health, defence, education, sports and aquatic or mixed‑use projects. Data Centre / Mission Critical project experience (highly desirable / preferred). Experience in preparing specifications, reports & technical documentation. Experience performing heat load calculations for HVAC systems. Ideally using Camel software. Experience with pipe sizing and ductwork sizing for HVAC systems. Strong understanding of relevant Australian codes, standards, and regulatory requirements including AS 1668 and the NCC. Experience with design coordination tools such as Revit, Navisworks or ACC. Good Knowledge of HVAC suppliers and equipment. Interest in developing skills in project delivery, resource planning, and commercial awareness. About You Demonstrated technical capability with a focus on high‑quality design delivery outcomes. Confident working independently on defined scopes of work. Detail‑oriented with a strong focus on accuracy, compliance and coordination. Proactive and entrepreneurial mindset, with the ability to identify opportunities and add value. Curious and growth‑oriented, with a willingness to ask questions, challenge assumptions and continuously learn. Collaborative team member who contributes positively to project and office culture. Committed to continuous professional development and technical excellence. Alignment with HDR’s values, including quality delivery, continuous improvement, and HDR’s employee‑owned culture. Benefits Opportunity to work on complex, high‑quality projects locally and internationally. A role with real technical ownership and influence. Career pathways towards technical leadership or project leadership roles. Supportive, employee‑owned culture focused on quality, collaboration and continuous improvement. Primary Location: Australia-NSW-SydneyIndustry: Building EngineeringSchedule: Full‑timeEmployee Status: RegularBusiness Class: Building MechanicalJob Posting: May 5, 2026 At HDR, we are committed to the principles of employment equity. We are an affirmative action and equal opportunity employer. We consider all qualified applicants, regardless of criminal histories, arrest and conviction records. #J-18808-Ljbffr