Enhancing Web-based Restaurant App

We are working on a web-based AI-driven application in the restaurant industry. The platform is already functional, and we are now looking to outsource specific development tasks to support our next release.

What we need:
We are looking for a skilled frontend and/or backend developer to help us with the following:
* Integrate and synchronize data with two POS systems (product and order sync — API documentation will be provided)
* Implement advanced product options management (e.g. sizes, add-ons, extras — typical in food ordering platforms)
* Coordinate frontend/backend interactions for smooth user experience
* Improve or extend UI components using React.js

Tech Stack (currently in use):
* Frontend: React.js
* Backend: Java with Spring Boot
* 3rd-party integrations: REST APIs for POS systems

Requirements:
* Solid experience with REST API integrations
* Good knowledge of Java & Spring Boot (for backend tasks)
* Experience with POS systems is a strong advantage
* Understanding of food industry product structures (modifiers/options)
* Comfortable working with Git and remote collaboration tools

Project Details:
* Project is already live — you’ll be contributing to clearly defined features
* Immediate start, with milestone-based delivery