Help me to understand the source code of an Angular 1.2/Java/Javascript app

Looking for a Sr. Software Engineer/Architect to help me understand the source code of an existing web application, front and back end, so I can extend and maintain this app. I understand how the whole thing works at an architectural/conceptual level and I have basic knowledge of Java/Javascript/Angular but I haven't written a line of code in about 8 years. I'm currently having trouble understanding how every piece interacts with others (so many frameworks/libraries, Jasmine, Protractor, Karma, Spring, etc) and how to write a new module. I'm thinking this is around 24 hr total (can be split in several sessions) you and me going through the existing source code, screen sharing and on a phone call (Skype, Webex or [login to view URL]) while you explain the code, e.g. what a class does, best practices to extend, etc. Think about it as being a mentor. You need to have minimum hands-on experience with: Javascript, Angular 1, Java, Spring, Maven, Gradle, Gulp, JUnit, IntelliJ. Desirable, Jasmine, Karma, Protractor. It needs to be in US Central Time, 7:00 - 9:00 AM CST 5:30 to 9:00 PM CST