Java Web App Code Optimization Expert

I'm seeking a Java expert to optimize the code of my web application.

Key tasks:
- Add new code / Clean up code
- UI customization
- Inventory Implementation
- Buy now button integration
- Inventory Tracking Parts
- Inventory Validation Enhancements
- Unit testing for Inventory Limits

- Enhance the performance and memory usage of the application.
- Improve the overall code efficiency.

Ideal skills:
- Extensive experience with Java and web applications.
- Proven track record in code optimization.

Please note, enhancing code readability is not a priority for this project.