01 — Consensus Patterns

Database Management Systems

A book-shaped table of contents for DBMS: relational foundations through SQL mastery, storage internals, transactions, distributed databases, NoSQL, and MAANG interview prep — cross-linking existing system-design/patterns notes instead of duplicating them.

Patterns

A book-shaped table of contents for reusable engineering patterns spanning object-oriented design, enterprise architecture, distributed systems, messaging, APIs, cloud infrastructure, observability, security, concurrency, AI/agentic systems, and organizational design — grounded in production experience at scale.

Patterns

A book-shaped table of contents for reusable engineering patterns spanning object-oriented design, enterprise architecture, distributed systems, messaging, APIs, cloud infrastructure, observability, security, concurrency, AI/agentic systems, and organizational design — grounded in production experience at scale.

04 — Consistency Patterns

Strong, Eventual, Causal, Read-Your-Writes, and Monotonic Reads consistency models — what guarantee a client actually gets, and what it costs in latency and availability.

02 — Coordination Patterns

Distributed Lock, Lease, Heartbeat, Membership, and Gossip — the primitives nodes use to coordinate without a single point of failure.

03 — Replication Patterns

Leader-Follower, Leaderless, Multi-Leader, and Read Replica replication — how copies of the same data stay available and how they diverge under partition.