Proficiency with Git-based collaborative development, including branch management, pull requests, code reviews, and integration with CI/CD pipelines (GitHub Actions, GitLab CI, Jenkins, AWS CodePipeline) to ensure reliable and traceable software delivery. Proficiency in SQL, including schema design, complex queries, and performance optimization > Relational databases such as PostgreSQL, MySQL, Oracle, AWS RDS/Aurora > NoSQL databases such as DynamoDB, MongoDB, or equivalent.