During September 2025, Gulikoza enhanced the NullAway static analysis tool in the uber/NullAway repository by adding support for java.util.Objects.toString(Object, String) in nullability analysis. This feature enables the tool to recognize when the default string parameter may be null, improving detection of potential null pointer exceptions in Java code. Gulikoza approached the task with a focus on static analysis concepts and test-driven development, implementing targeted unit tests to validate both null and non-null scenarios. The work demonstrated a solid understanding of Java development and collaborative Git workflows, delivering a focused, well-tested improvement that increases code safety and reliability.