HLD (High-Level Design) and LLD (Low-Level Design) are essential concepts in the field of software development and engineering. Their importance does not solely depend on the number of years of experience a person has but rather on the complexity of the software being developed and the team's overall development process. However, for a 2-year experienced person in the software industry, understanding and applying HLD and LLD can significantly impact their effectiveness as a developer and their contributions to the team.

Regardless of the years of experience, both HLD and LLD play critical roles in software development. They contribute to better project organization, improved collaboration, enhanced system understanding, and ultimately, the successful delivery of high-quality software products. As a developer gains more experience, they may find themselves involved in creating and reviewing HLD and LLD documents for more complex systems.