Simple Service App Development

I'm looking for a skilled app developer to create a straightforward service-oriented application. The specifics of the services haven't been finalized yet, so I'm open to suggestions.

- Primary Purpose: The app's main function will be to connect users with various services.
- User Authentication: The need for user authentication is still under consideration, so flexibility and experience with both options would be beneficial.

Ideally, you should have experience in creating service apps and be able to provide insight into potential features and services that could be included. A portfolio showcasing similar projects would be highly advantageous.