Dropbox Sign Integration for Existing Replit SaaS Application

I have an existing SaaS application built with Replit and I am looking for an experienced developer to help me integrate Dropbox Sign into the platform. The goal is to allow my users to send documents for electronic signatures and manage the entire signing process directly inside the application. I need someone who can understand the current application structure first and then implement the integration in a clean and reliable way without disrupting the existing system. The work will include connecting Dropbox Sign API, creating the signing workflow, handling signature status updates, and making sure the application can properly receive and display real-time changes through webhooks. The final experience should feel natural for users. They should be able to send documents, track progress, and know exactly what stage each signature request is in without confusion. I also need proper handling for situations like expired requests, declined signatures, incomplete signing processes, and API errors. Experience with SaaS applications, API integrations, webhooks, and Replit-based projects will be highly preferred. Please share your previous experience with similar integrations and let me know your estimated timeline. I am looking for someone who can not only connect the API but also help me build a stable and user-friendly signing experience.