Worked on the getsentry/sentry-go repository to enhance testability and code quality for core client and hub interactions. Developed and exposed root-package mocks for Scope and Transport, enabling more efficient and reliable unit testing by reducing setup complexity and minimizing test flakiness. Applied Go development skills to perform repository-wide lint cleanup, updating test and example signatures to handle unused parameters and refining CI linting options for greater consistency. Focused on CI/CD, mocking, and refactoring, these contributions improved developer productivity, ensured stable continuous integration, and established a stronger foundation for future enhancements to the core client within the Go codebase.