Hiring a cross-layer design developer is crucial for ensuring efficient, seamless integration across multiple layers of your tech stack. They possess a holistic understanding of how changes in one layer impact the others, leading to optimized performance and reduced errors. Their ability to navigate between hardware, network, and application layers allows for robust, scalable solutions tailored to your specific needs. Their broad expertise can also facilitate improved collaboration among specialized teams, promoting a more cohesive development process. Ultimately, their skills can lead to cost savings, increased productivity, and a more resilient system.