In September 2025, Gulikoza contributed to the uber/NullAway repository by enhancing its static analysis capabilities for Java code. Gulikoza developed a feature that improved nullability analysis for the java.util.Objects.toString(Object, String) method, ensuring that cases with a possibly null default string are correctly treated as nullable. This work involved implementing logic in Java to recognize and handle these scenarios, accompanied by targeted unit tests to validate both null and non-null defaults. By focusing on static analysis and test-driven development, Gulikoza’s contribution increased the reliability of null-safety checks, helping prevent potential null pointer exceptions in Java applications.