Karthik worked on the tf-nira/registration-client repository, focusing on backend development and validation logic using Java. During March 2025, he consolidated the age and years-lived validation to enhance data integrity and maintainability. His approach involved rolling back a previous strict comparison between resident years lived and applicant age, stabilizing the validation flow. He then introduced a robust check ensuring that years lived at a residence cannot exceed the applicant’s age, wiring age data through the GenericController for consistent cross-validation. This work addressed both a feature and a bug, reflecting a methodical and targeted improvement to the project’s validation framework.