João Martins developed and integrated an Aptos Swap Testing Framework for the LedgerHQ/app-exchange repository, focusing on robust end-to-end validation for exchange functionality. He implemented new Python-based tests, fixtures, and snapshot assets, ensuring comprehensive coverage of Aptos swap scenarios, including transaction fee handling. By extending the CI/CD workflow and updating YAML configurations, João enabled automated testing and seamless integration of Aptos features into the build process. Additionally, he delivered a configuration update for Aptos flags in the LedgerHQ/ledger-app-database repository. His work emphasized backend development, testing, and CI/CD, resulting in deeper test coverage and improved release stability without direct bug fixes.