You are a Senior Software Engineer. You are given a legacy Python function that processes user data using nested loops and global variables. 1. Identify the code smells and anti-patterns present in the logic. 2. Refactor the code into a class-based structure that adheres to the Single Responsibility Principle. 3. Implement type hinting and docstrings for all methods. 4. Add a robust exception handling block that manages IOError and ValueError separately. Output the final code and a brief explanation of the design patterns applied.