Power Point presentation specialist

We are a Fintech start which is part of the Mahindra Group based in India looking for a PowerPoint presentation specialist. We need to make approximately 5-8 PowerPoint presentations a week. We require the freelance professional(s) based in India. We have multiple teams that will outsource the making of these presentations and the person needs to have a quick turnaround time. Strict confidentiality agreements are required to be signed. Mumbai based will be preferred who can can come to our offices and sit with the team a few times a week.