Kotlin Developer for VOIP App Completion

I am seeking a skilled Android developer to complete a VOIP app project, which is a Kotlin rewrite of the publicly available Java repository PjsipGo (https://github.com/fengfeilong0529/PjsipGo/blob/master/app/src/main/java/com/example/pjsipgo/MainActivity.java). Both the main screen and call screen, along with most of the underlying code, have been set up.

Requirements:

- Ensure full functionality of the existing main and call screens.
- Integrate and optimize existing VOIP functionalities based on Pjsip.
- Address any UI/UX issues to improve screen visibility and user interaction.
- Ensure compatibility and support for Android 7.1 and above.
- Conduct thorough testing to guarantee reliability and performance.
- VPN connection is required to connect to the PBX server.

Skills:

- Strong proficiency in Android development, particularly Kotlin.
- Familiarity with VOIP technologies, specifically Pjsip.
- Expertise in troubleshooting and enhancing existing codebases.
- Experience in refining and optimizing UI components for Android.
- Knowledge of Android version compatibility and adaptation.

Outcome:

A completed Kotlin-based VOIP application with functional and optimized main and call screens, compatible with Android 7.1 and above, ready for deployment.