Company Description At Green Gravity, we’re pioneering a breakthrough approach to the clean energy transition. Our mission is to repurpose legacy mining infrastructure into cutting-edge gravitational energy storage systems, delivering a sustainable, low-cost solution to renewable energy storage challenges worldwide. We’re tackling one of the most important challenges of our time: enabling the shift to a net-zero future. By joining our passionate and highly engaged team, you’ll contribute directly to meaningful, world-changing work — with the support of an inclusive, flexible, and empowering workplace that optimises your ability to make a difference. The Opportunity Based in either Brisbane or Wollongong, we’re seeking a Mechanical Engineer to play a critical role in the design and development of Green Gravity’s surface-based mechanical systems that support our Gravity Energy Storage System. Reporting to the Senior Mechanical Engineer and working within our Product Development team, this role is responsible for delivering safe, robust, and scalable mechanical solutions for handling and managing large weighted objects in heavy industrial environments. This is a hands-on engineering role suited to someone who enjoys working in a fast-growing, early-revenue organisation where autonomy, accountability, and technical rigour are essential. Key Responsibilities Lead the mechanical design and development of surface-based systems for handling, storing, transferring weights. Progress mechanical concepts through increasing levels of design maturity. Perform detailed mechanical engineering design, modelling, and documentation. Evaluate designs for safety, reliability, maintainability, fatigue, and environmental conditions. Conduct techno-economic analysis to optimise cost, throughput, and scalability. Engage with vendors, suppliers, and OEMs. Collaborate with electrical, controls, and systems teams. Support testing, prototyping, commissioning, and continuous improvement. About You We’re looking for a practically minded mechanical engineer who thrives in dynamic environments and enjoys partnering with multiple engineering disciplines to drive high-performance mechanical component outcomes. You don’t need to meet every requirement to apply — if you’re excited by the opportunity and believe you can make a strong contribution, we encourage you to apply. We are looking for: Bachelor of Mechanical Engineering, or Mechatronics Engineering or equivalent. Experience in materials handling systems within mining or heavy industry. Strong mechanical design and modelling capability. Systems-thinking mindset. Comfortable working in a dynamic, start-up environment. Why Join Green Gravity Purpose with Impact: Be at the forefront of the global clean energy transition, shaping a new category of grid-scale storage. Technical Ownership: Operate as a recognised subject-matter expert with genuine authority and influence over outcomes. Flexible & Inclusive: Flexible working arrangements that support balance and performance. Growth & Development: Develop alongside a growing project delivery portfolio and expanding technology deployment. Autonomy & Accountability: Work in a pre-revenue, high-impact environment where your decisions truly matter. Equity Participation: Share in the success you help create through our employee equity scheme. Location Advantage: Based in Wollongong, with collaboration across Wollongong and Brisbane teams. If you’re excited by the idea of applying your mechanical engineering expertise to one of Australia’s most impactful clean energy technologies — and want to work in a collaborative, values-driven environment where engineering excellence truly counts — we’d love to hear from you.