The pressure to deliver flawless software can weigh heavily on developers' minds and cause teams to second-guess their processes. A design review conducted by the MongoDB Developer Relations team can go a long way in ensuring best practices have been followed and that optimizations are in place to help the team deliver confidently. Design reviews serve as hour-long sessions where the team partners with customers to fine-tune their data models for specific projects or use cases, leveraging the development team's own workload as a case study to illustrate performant and efficient MongoDB design principles. The underlying principle of these reviews is the domain-driven design ethos, an indispensable concept in software engineering that emphasizes mastery of tools and addresses access patterns and optimizing schema for performance. A design review is a catalyst for transformation, fostering innovation and collaboration between expertise and developer talent. By examining workload data-related functional requirements and non-functional requirements like growth rates, performance, and scalability, the MongoDB DevRel team recommends target document schemas to help developers achieve their goals. Design reviews have been instrumental in helping customers avoid lost time and effort due to poor schema designs, and can result in significant performance improvements, such as a 60x improvement in pipeline performance for a financial services customer.