As the sole iOS developer, I was responsible for developing and maintaining three iOS apps within an Agile development environment. I refactored highly coupled projects with complex dependency graphs into maintainable and scalable solutions by adhering to SOLID principles, Dependency Injection and adopting Composition Root. I introduced Test-Driven Development (TDD) to projects that previously had no tests, facilitating fast automatic testing. To enhance the codebase, I modularized a monolithic project, ensuring clear separation of concerns and isolated testing capabilities. Collaborating closely with backend engineers, I consulted on and defined API specifications. Additionally, I incorporated a Continuous Integration/Continuous Deployment (CI/CD) workflow using Xcode Cloud, which automated testing and product delivery. I transitioned the dependency management system from CocoaPods to Swift Package Manager, decoupling projects from third-party solutions and simplifying dependency management. Furthermore, I integrated Swift into an Objective-C project, enhancing its functionality and modernizing its codebase.