1. Painting color appImplement daily and achievement features to make the app more interesting.Improving user experience when painting, including speedup loading and saving time. Also, optimization memory usage to prevent OOM and ANR on low-end devices.2. Launcher and theme packMaintain the launcher app and theme pack appsIncreasing advertising revenue by constructing a mechanism to load multi-ads.

1. ZenUI clockImplement features for alarm, timer, stopwatch, and world clock based on the AOSP clock.2. ZenUI SafeguardDevelop features to call or send SOS messages to the user's emergency contact. Also tracking the movement and information shared from the user on a back-end server.3. ZenUI theme/component libraryA library provides diversification styles and themes for apps to have the same look and feel.Modify AOSP components and implement ZenUI components to achieve high-quality user experience.4. Maintain a back-end server deployed on Azure to record and verify IAB and limited-time-free merchandise.5. Calabash-android：automated acceptance tests using a behavior-driven development style.