Hi,
As you wrote, you want a java based, web auction system.
I can help you with that.
"Software Skills: J2EE, Android, JSON & Restful Web Services, FCM, Google Analytics, Google API, JUnit, Mockito, Wiremock, Espresso, Robolectric, Sonarqube, Kotlin, Rxjava ".
Please start a chat to initiate it right now.
Thanks & regards