- Tools: Reveal (https://revealapp.com/) for dealing with app's UI, Sublime (https://www.sublimetext.com/) for text editors, Paw (https://paw.cloud/) for making API calls, Proxyman (https://proxyman.io/) for manipulating requests/responses when debugging

- Quick hacks: Moya library (https://github.com/Moya/Moya) for categorizing API route, Diff Algorithm for reloading huge UITableView efficiently

- Others: Have a dog and sleep well :)