Worked on the wazuh-indexer repository to enhance backend reliability by addressing test suite instability and improving the consistency of critical workflows. Focused on Java-based bug fixing, the developer stabilized flaky tests by enforcing deterministic materialization, sequencing, and preconditions across modules. Node metadata handling was hardened by deriving IDs from a fixed set of version constants, eliminating randomness in test outcomes. Snapshot operations were made more robust by introducing cluster health checks and aligning preconditions to prevent intermittent failures. These targeted improvements in software development and unit testing contributed to safer, faster releases and reinforced the reliability of continuous integration processes.