Performance Improvement and Null Safety Enabling for Grocery Delivery Mobile App

Client and Business Goals

Our client, a Germany-based startup that provides on-demand grocery delivery services from the local markets in several German cities.

The client’s business is based on fast and sustainable goods delivery. To ensure the high quality of provided service, they developed a mobile application, allowing their clientele to order food quickly and safely, which was especially important during the pandemic.

The application was built with Flutter and after a few years of use, they faced some performance problems due to the outdated technology version. In addition, they needed to implement a null safety function to make the application compatible with later Flutter versions.

To make the amendments in the application code, the client was looking for a reliable partner with a proven track record of Flutter app development, and our team was chosen as a contractor for the project with no hesitation.

Challenge

When we started working on the project, there was an issue with backend responses. The problem was in the error of field labeling (whether it was obligatory or not). Obligatory fields were labeled as non-nullable, and the backend sent them back as nullable, which caused errors.

To fix the issue, we went through the fields to add the logic of nullable variables and refresh the logic assignment of the fields for error-free backend functioning