THE WAY WE THINK ABOUT SYSTEMS
Understand.
Don’t memorize.
A great diagram is the result of good reasoning—not a substitute for it.
This field guide makes that reasoning visible, one layer at a time.
Start small.
A client, a request, a response. Add a component only when you can explain the requirement it satisfies.
Ask why.
Every design is a set of tradeoffs. Change the constraints, and the right architecture can change too.
Make it yours.
Step through each architecture, download its editable Excalidraw file, and try a different solution.
A CONSISTENT READING FRAMEWORK
Different systems. The same thoughtful questions.
Every article follows these 15 chapters. Nothing from the original source is discarded: its sections are grouped by topic, and additional workshop notes are clearly labeled.
Requirements & scope
Name the user problem, the essential capabilities, and the boundaries.
Scale estimations
Make the traffic, storage, and latency assumptions explicit.
Layered architecture
Begin with one component and give every addition a reason to exist.
API & contracts
Define request identity, authentication, errors, and retry behavior.
Data model
Choose durable records, access patterns, keys, and indexes.
Core design decisions
Compare alternatives and say what you gain and give up.
Request flows
Follow critical reads and writes through the system.
Performance & caching
Find the bottleneck before adding a cache or another service.
Advanced design
Explore the subsystem that makes this problem distinctive.
Edge cases
Examine races, partial failures, and ambiguous outcomes.
Tradeoffs
Summarize the decisions and what would change them.
Reliability & fault tolerance
Define failure domains, degradation, and recovery.
Production architecture
Connect the data path with the operational control plane.
Further exploration
Challenge an assumption and investigate a different solution.
Interview playbook
Explain the reasoning clearly rather than reproducing a picture.
Open source. Open knowledge.
This site is based on SiluPanda/awesome-system-design: 30 articles across 8 categories. The 485 original sections and 601 source diagrams are preserved. Diagram drawings are generated locally, not fetched from a third-party rendering service.
Difficulty levels and the learning path are editorial suggestions. Scale estimates are hypothetical design assumptions, not audited measurements of named companies. These are educational designs—not claims about proprietary architectures or deployment-ready specifications.
Source snapshot: 9eee90f, imported September 4, 2026. The repository README declares the MIT license. Saved designs and reading progress stay in this browser; there are no accounts or analytics.