Similar to how we reused the pre-computation pattern in Twitter’s high-level design, deep dive topics can often be adapted across systems facing similar challenges. For example, the API Gateway introduced in the short URL service was easily applied to Twitter. Similarly, a sharded counter can effectively manage likes on systems like Facebook or YouTube, and Redis Sorted Sets can be utilized in a variety of scenarios requiring efficient ranking or prioritization. In this sense, system design often feels like a matching problem—aligning proven patterns and components to the specific needs of a system.

In short, solving system design interview problems can be summarized as follows:

1. Gather the Core Requirements: Understand both the functional requirements (e.g., specific features or operations) and non-functional requirements (e.g., scalability, latency, availability).
2. Capacity Estimation: Apply this strategically. Perform it early if you feel confident it will shape your design, or revisit it later when scalability challenges arise.
3. Database Design: Choose a database based on capacity estimation and query patterns. Model the data to optimize for key operations, considering data partitioning, normalization, or denormalization as needed.
4. API Design: Focus on identifying core APIs and analyze the read and write paths. This helps you sketch out the initial high-level design and ensures clarity about how data flows through the system.
5. Create the Initial High-Level Design: Start with a simple design and identify areas that require scalability solutions. Iterate on the design, refining and optimizing until it satisfies the requirements.
6. Apply Deep Dive Topics: Use your knowledge of deep dive topics (e.g., caching, sharding, pre-computation, indexing) to address specific challenges and optimize the design further.

Mastering system design requires consistent practice and exposure to a variety of problems and solutions. The more problems you solve, the more patterns you recognize, making you better prepared to tackle new and complex challenges. This course is designed to help you refine your ability to present solutions effectively during interviews and provides practical strategies for tackling system design problems. We encourage you to start practicing more problems on the Codemia Platform!