Worked on the fivetran_connector_sdk repository to address data integrity issues in the Toast connector, focusing on backend development and data synchronization using Python. Implemented a deterministic hash to uniquely identify applied tax records, replacing a non-deterministic UUID approach that previously caused duplicate MAR entries. Expanded the hash input set to improve uniqueness and reduce collision risk, directly enhancing the reliability of downstream data pipelines. Cleaned up code by removing unused imports and resolving flake8 warnings, which stabilized CI tests. Incorporated code-review feedback to update connector logic, resulting in more trustworthy analytics and smoother data synchronization for partner integrations.