Environment Config Loader - Quant Developer Interview Question

Problem Description

Configuration management in high-frequency trading systems requires minimal latency and robust error handling to ensure stability during runtime. Parameters such as risk limits and connection strings are often injected via environment variables to avoid the overhead of file I/O operations. A robust configuration loader is essential to parse these variables efficiently, handle missing keys gracefully, and provide type-safe accessors. Task Implement a ConfigLoader class to parse environment confi