As a Lead iOS Engineer at WeTransfer, Antoine van der Lee is focused on code architecture and team processes, with a passion for contributing to the iOS community. He emphasizes the importance of optimizing workflows, which can lead to significant time improvements. Key steps to optimize workflows include running only necessary steps, enabling caching to speed up, and optimizing installing dependencies. By implementing these optimizations, developers can save time in their builds, making their development process more sustainable. Additionally, Antoine shares his experience with caching dependencies, highlighting the importance of considering reliability issues when deciding whether to cache dependencies, and providing examples of how to implement caching for GEMs and Brew packages effectively. By following Antoine's advice, developers can improve their workflows and make their development process more efficient.