Hld:

• High-level design is a place in the software development life cycle where the overall architecture and structure of a software system or application are planned or documented comprehensively. It is an essential step that bridges the gap between the requirement Specification and the actual implementation of the system.
• The goal of HLD is to provide a blueprint or road map for how the system will function and how its various components will interact.

Key aspects of HLD:

• Requirement analysis.
• System architecture.
• Module/component design.
• Data design/interface/API schema.
• Technology choices.
• Requirement analysis :
  • Functional requirements: product manager.
  • Non-functional requirements: Architect/ tech lead.
• Security, performance, responsiveness, accessibility, SEO, offline support, testing, caching etc.

Functional requirements:

• Functional requirements are something which you see from a user prospective.
• What are the features and capabilities that you providing to the user?

Hld for e-commerce: Browse product & purchase. Functional requirements:

• Browser product :
• search
• filters