Review Software Specification for Internal Publishing Automation (No Coding Required)

I'm looking for a senior full-stack developer to review the architecture of a private internal web application before development begins. This is a paid planning project only. No coding is required. The application will: Generate batches of 20-slide TikTok carousel JPGs Apply multiple background images to the same carousel Upload the generated images to Google Drive Be used only by my internal operations team I'm looking for feedback on: Recommended architecture Web app vs desktop app Recommended tech stack Potential risks Estimated cost and timeline for Version 1 I already have a detailed specification and will provide it after hiring. I prefer communication through Upwork messages only. If we work well together, this may lead to the full development project.