Nikita Puzankov worked on the Entropy-Foundation/aptos-core repository, focusing on improving CI/CD reliability and test data quality. He refactored CI configurations and modernized Cargo and GitHub Actions workflows, streamlining build processes and removing outdated test setups. Using Rust, TOML, and YAML, Nikita enhanced the arb_transaction_status test data generation to filter out incompatible VM status and code combinations, ensuring that only valid scenarios are tested. He also fixed the arbitrary implementation for Transaction Status, which improved test reliability. His work reduced test flakiness and accelerated feedback loops, strengthening the overall quality gates for continuous integration and delivery.