Developed a feature for the starkware-libs/starkware-starknet-utils repository that introduced a start_time argument to the Starknet devnet infrastructure, enabling precise control over execution timing in development environments. This enhancement was implemented using Python and focused on backend development and subprocess management. By allowing developers to specify exact start times, the update improved reproducibility and supported deterministic test runs, reducing variability and increasing reliability during development and testing. The work addressed a core need for stable infrastructure timing, streamlining workflows and enhancing productivity for teams working with Starknet’s development tools. No bug fixes were recorded during this period.