I am a registered landscape architect, I am living/working close to your project in The Hills.
I can definitely help you with all your needs of landscape design, planting, harworks, lighting and all other features such as walls, furniture or water features if you like.
Please note, if you require a civil engineer to work on the structural design for retaining walls, that will be available with extra fees, if your contractor (builder) can absorb this cost, then please consider my offer for this project.
Thanks.