Month: 2025-11. This period focused on strengthening AWS Step Functions support in localstack/localstack through validation enhancements and robust test coverage, delivering measurable business value by preventing misconfigurations and runtime errors. Key features delivered include an AWS Step Functions Query Language Validation Enhancement that ensures state machine query language usage is consistent and valid, along with added test cases to validate behavior when downgrading query languages to prevent logical conflicts. Major bugs fixed include a state machine definition validation bug (Step Functions: fix validate-state-machine-definition) that could allow invalid configurations to slip through; this fix improves reliability and reduces runtime failures. Overall impact: higher reliability for customers deploying Step Functions on LocalStack, reduced risk of misconfigurations, and safer downgrade paths, enabling smoother CI/CD and faster feature adoption. Technologies/skills demonstrated: Python-based backend development, test-driven development, expanding unit/integration test coverage, commit-driven development, and collaborative code review; strong focus on business value and reliability.