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System Design notes for developers

Master System Design with a curated set of 2 developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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System Design

Scalability & Architecture

Scalability & Architecture Scalability Patterns Horizontal scaling — add more servers; requires stateless app (store sessions in Redis, not in-process) Load bal…

System Design

Reliability & Interview Framework

Reliability & Interview Framework Reliability Patterns Circuit Breaker — stop calling a failing service after N failures; half-open state to probe recovery Retr…

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TypeScriptgeneral

Interview Questions

TypeScript Interview Questions Comprehensive TypeScript interview questions covering type system, generics, utility types, and best practices: Fundamentals 1. What is TypeScript? TypeScript is a typed…

Mar 28, 2026
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TypeScriptgeneral

Advanced Types (Generics & Utility Types)

TypeScript Advanced Types Generics // Generic function function identity<T>(arg: T): T { return arg; } const num = identity<number>(42); // Explicit const str = identity('hello'); // Inferred // Gener…

Mar 3, 2026
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