The early stages of software development are often characterized by frequent changes and rapid prototyping. While this agility is essential, it can lead to codebases that are difficult to maintain and reuse. Design patterns offer structured solutions to mitigate these issues. This paper proposes a systematic and methodical approach for the early integration of design patterns, aimed at improving code maintainability, reusability, and adaptability. Unlike previous works that mainly address design patterns in later phases, our approach focuses on systematic identification, selection, and integration from the earliest iterations. A preliminary validation study conducted on a web development project demonstrates the effectiveness of the proposed method in terms of reducing complexity and improving architectural clarity.