Worked on the mudita-center repository to improve end-to-end testing reliability by enhancing API mocking and backend workflows using TypeScript. Focused on stabilizing mock data scenarios, the developer merged predefined and dynamic fields in PRE_BACKUP mock responses to ensure backupId consistency across POST and GET requests, directly improving test accuracy. Additionally, they simplified environment setup by ensuring the mock service remained enabled in all configurations, reducing setup complexity and configuration drift. Their work in API mocking, backend development, and testing contributed to more stable CI pipelines, faster feedback cycles, and increased confidence in backup-related workflows within the project.