I reduced deadline time by about 10% by using mock responses for unavailable endpoints, which has reduced the deadline for releases. I Improved application performance from 90% to 99% by productively detecting a data race problem too hard to do in shared mutable objects. Solved by implementing SOLID principles, good CGD handling and concurrency I taught the iOS team how to troubleshoot and detect problems with the data race condition in shared mutable data using CDG, advanced swift knowledge presented with Diagrams and decoupling of the must modules to improve the next project with similar behavior to be implemented.