POS APP integration with existing Admin Backend -- 2

I need a skilled developer to integrate a POS terminal with an existing admin backend. Key requirements include:

- Real-time synchronization: The system should allow for real-time data transfer between the POS terminal and the admin backend. This includes sales, inventory updates, and user transactions.

Ideal skills for this project include experience with POS systems, backend development, Engineering and real-time data synchronization. Please provide examples of similar projects you've completed in your proposal.