Website/App Update

I am looking for experienced help with updating my existing website/app. Specifically, I want to add new features to the website/app. As I have a timeline that needs to be followed, I need someone who can work within the given timeframe to get the job done quickly and effectively. Additionally, the desired update is relatively low in complexity, but I want the end product to be of the highest quality. Overall, I am looking for a skilled freelancer who can achieve these goals.