Dagster is a data orchestration framework designed to serve developers at every stage of the software development lifecycle. The five stages of the software development lifecycle are writing code, testing, review and collaboration, deployment, and monitoring and observability. Dagster provides support for all these stages through its declarative programming model, software-defined assets, built-in testability, branch deployments, local development, config-as-code, and declarative scheduling features. These features help developers write high-quality code efficiently and effectively, test their code thoroughly, review and collaborate on code, deploy their code successfully, and monitor the performance of their software. Dagster is designed to serve every stage of the development lifecycle, unlike existing solutions like Airflow and Prefect that have limitations when it comes to serving all stages.