Engineer design and stamp for retaining wall

I'm looking for an experienced engineer to help with the design and stamp for a retaining wall. I will provide the dimensions - height, length, and width - of the wall. The retaining wall will be built on rock and soil, and I'm aiming for the wall to have a lifespan of more than 20 years. The end design should include any council approvals, and any additional certificates required. The engineer must be able to complete the design and stamp it with their professional seal. Timeframe is flexible, depending on complexity, though I'm looking for a quick turn-around time. If you have any questions or need additional information, please don't hesitate to ask. Thanks.