Worked on the elixir-ecto/ecto repository to enhance the correctness and reliability of analytic queries by addressing a macro expansion issue within the over/2 order_by clause. Applied expertise in Elixir and macro programming to implement a targeted fix, introducing a get_env helper function that accurately extracts environments from nested tuples, ensuring proper macro expansion handling. Expanded automated test coverage to include complex macro scenarios, verifying the robustness of the solution. Focused on database query optimization and test-driven development, the work improved the stability of Ecto’s analytic queries while demonstrating depth in Elixir’s macro system and advanced query handling techniques.