Worked on backend reliability within the civicrm/civicrm-core repository, focusing on resolving a bug in the ContributionPage BAO logic. Addressed an issue where the conditional incorrectly checked receipt_from_name twice, updating it to properly use receipt_from_email when an email is not provided. This ensured that the system reliably falls back to the domain’s name and email, reducing misrouted emails and data inconsistencies in ContributionPage workflows. Updated automated tests to validate scenarios with empty receipt_from_email, improving test coverage and reliability. Utilized PHP and backend development skills to deliver a targeted fix that enhances downstream integrations and overall system stability.