Java Backend Developer for Web App

I'm seeking a seasoned Java backend developer with over 5 years of experience, specifically for supporting a web application. Key functionalities the backend should cater to include user authentication.

Ideal Skills and Experience:
- Proficiency in Java with a focus on backend development
- Extensive experience in developing for web applications
- Strong understanding and experience in implementing user authentication systems
- Knowledge of data storage and retrieval processes
- Experience with real-time updates is a plus
- Excellent problem solving and debugging skills
- Strong communication skills.