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CQRS notes for developers

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

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01 · CQRS

CQRS Fundamentals: Commands, Queries & Handlers

CQRS: Commands, Queries & Handlers. CQRS (Command Query Responsibility Segregation) separates the model/path for WRITING data (commands) from the model/path for READING data (queries) -- rather than one unified model ser…

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02 · CQRS

CQRS: Denormalization, Event Sourcing & When to Use It

CQRS: Denormalization, Event Sourcing & When to Use It. Intentional Denormalization on the Read Side. A read model can duplicate data (storing a customer's name directly on an order record) specifically to avoid a join a…

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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…

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 //…

Mar 3, 2026

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