Would this Upwork proposal make you reply?

Since you already have an existing SaaS application, I’d like to understand the current architecture so we can plan the addition of new modules accordingly. I’ve previously worked with both microservices architectures and plugin-based architectures.

I would start by defining the module’s purpose and scope, then validating its alignment with the product roadmap. I’ll follow the existing system and API architecture to ensure scalability and to maintain a consistent user experience across the application.

In the past, I’ve added a custom billing module to an existing SaaS application using a microservices architecture and REST APIs.

I’m available to begin auditing your current SaaS application and can provide a comprehensive action plan before starting development.