With over 4 years of experience in Android app development, I am confident in my ability to complete all the required changes and improvements for your app effectively. Having worked on numerous projects with APIs, graphics creation, day/night mode, and form validation, I am well-versed in all the necessary skills you need.
In terms of data management and security, I can leverage Shared Preferences to ensure airtight safety while implementing data filters to prevent duplication issues. My proficiency in semaphores guarantees smooth handling of concurrent user activities. Moreover, as an expert in creating both public and private chat functionalities for apps, your users would have seamless communication experiences.
Lastly, let's not forget about budget-consciousness – your project budget of $60 aligns perfectly with my services. Trust me to diligently work within its parameters without compromising the quality or timeliness of delivery. Let’s save time and ensure an incredible turnaround by entrusting this pivotal task to someone skilled, experienced, and cost-effective like me! Let's discuss further!