Worked on enhancing the reliability of the ballerina-platform/ballerina-lang compiler by addressing parser robustness and error recovery over a two-month period. Focused on Java-based compiler and parser development, implementing targeted fixes to prevent crashes caused by missing 'if' keywords in conditional statements. Developed new methods for handling missing type descriptor nodes and introduced comprehensive unit and regression tests to validate parser behavior, especially in complex and nested expressions. These changes improved error detection and recovery, reduced the risk of runtime issues, and contributed to smoother CI pipelines, ultimately increasing the reliability and maintainability of the core language parser.