Worked on the spring-framework repository to optimize backend performance by stabilizing the buffer count in ConcurrentLruCache. Using Java, the developer removed CPU-detection logic for buffer sizing, setting the buffer count to a constant value of four. This approach simplified the codebase, reduced maintenance overhead, and improved cache predictability across different CPU configurations. The change maintained external API behavior while delivering more stable throughput under concurrent access. By focusing on targeted refactoring in a performance-critical path, the developer enhanced code maintainability and enabled easier future optimizations, demonstrating a strong grasp of backend development principles and performance engineering in Java.