This article discusses implementing a middleware-based workflow for AWS Lambda functions using TypeScript to improve maintainability and scalability. It highlights the benefits of TypeScript for AWS Lambda, such as type safety and reduced errors, and emphasizes the importance of schema validation for data integrity. The article explores three approaches: a basic Lambda, a Lambda with @middy, and one enhanced with @raminy/ajv-ts-schema for schema validation. It also addresses the drawbacks of manual validation, like tediousness and error-proneness. By using middleware and schema validation, Lambda functions focus on business logic, offloading validation to reusable components.