During the month, contributed to the pinterest/mojito repository by addressing two backend issues focused on data reliability and input safety. Improved the BranchStatistics API by resolving a branchId filtering type mismatch, ensuring accurate joins between entities and correct comparison logic using JPA/Hibernate and Java. Enhanced the WordCountService so that getEnglishWordCount now safely returns zero for null or empty input, preventing potential NullPointerExceptions. Both fixes were reinforced with targeted unit tests to verify behavior and guard against regressions. The work emphasized robust API development practices and increased test coverage, aligning with business goals for data correctness and maintainable backend systems.