# hld-lld

## Docs

- [How to Approach a Design Problem](https://hld-lld.com/foundations/how-to-approach.md): A repeatable framework for tackling any system design question
- [Key Concepts](https://hld-lld.com/foundations/key-concepts.md): Scalability, availability, latency, throughput and more
- [What is System Design?](https://hld-lld.com/foundations/what-is-system-design.md): An introduction to system design and why it matters
- [Building Blocks](https://hld-lld.com/hld/building-blocks.md): Load balancers, databases, caches, CDNs, and message queues
- [HLD Case Studies](https://hld-lld.com/hld/case-studies.md): End-to-end designs: URL shortener, Twitter, YouTube and more
- [HLD Patterns](https://hld-lld.com/hld/patterns.md): Common architectural patterns for large-scale systems
- [Welcome](https://hld-lld.com/index.md): A step-by-step guide to mastering High Level Design and Low Level Design for SWE interviews
- [Common Mistakes](https://hld-lld.com/interview/common-mistakes.md): What most candidates get wrong and how to avoid it
- [Practice Problems](https://hld-lld.com/interview/practice-problems.md): A curated list of problems to practice end-to-end
- [How to Structure Your Answer](https://hld-lld.com/interview/structure.md): A step-by-step framework for answering design questions in interviews
- [LLD Case Studies](https://hld-lld.com/lld/case-studies.md): End-to-end designs: Parking lot, Chess, Elevator and more
- [Design Patterns](https://hld-lld.com/lld/design-patterns.md): Creational, structural and behavioural patterns with examples
- [OOP Principles](https://hld-lld.com/lld/oop-principles.md): SOLID, DRY, KISS and other core OOP principles
- [Resources](https://hld-lld.com/resources/index.md): Books, courses, and links worth bookmarking

## OpenAPI Specs

- [openapi](https://hld-lld.com/api-reference/openapi.json)