Worked on improving server-side input validation in the ggml-org/llama.cpp repository, focusing on handling grammar input more robustly. Addressed a bug where invalid grammar submissions previously failed silently by implementing logic to return an HTTP 400 response, ensuring clients receive clear feedback on input errors. Enhanced backend reliability by adding regression tests to verify that invalid grammar inputs are consistently detected and handled, preventing future regressions. Utilized C++ and Python to develop and test these changes, applying skills in backend development, error handling, and unit testing. This work laid the foundation for more reliable and maintainable input validation processes.