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Developer interview revision notes

Quick-revision notes for developers preparing for interviews. Pick your tech stack, read the key points, check the code examples and take the interview tips with you. 20 topics, free, no sign-up.

Frontend

HTML4 sectionsCore HTML concepts for frontend interviews.CSS4 sectionsCore CSS concepts for styling and layout.JavaScript49 sectionsInterview-focused revision.JavaScript in the Browser14 sectionsDOM, events, fetch, storage and other browser APIs you'll commonly face in interviews and real projects.TypeScript10 sectionsStrongly-typed JavaScript for safer, more maintainable code.React21 sectionsUI library: components, hooks, state.Angular5 sectionsCore Angular concepts for frontend interviews.

Backend & APIs

Node.js21 sectionsServer-side JavaScript: runtime, modules, npm, core APIs, and HTTP.Express23 sectionsNode.js web framework: routing, middleware, APIs.REST API10 sectionsDesign and implement RESTful APIs.JWT9 sectionsStateless authentication tokens for APIs.Google Cloud (GCP)18 sectionsGoogle Cloud Platform: compute, storage, serverless.

Databases

MongoDB20 sectionsNoSQL document database: CRUD, Mongoose, aggregation.Mongoose10 sectionsObject Data Modeling (ODM) for MongoDB in Node.js.DBMS and SQL19 sectionsRelational databases: SQL, tables, JOINs, transactions.

Design & Architecture

OOP19 sectionsInterview-focused OOP revision.Data Structures20 sectionsInterview-focused Data Structures revision.Microservices9 sectionsDesign and operate microservices.Project Architecture8 sectionsSoftware and project architectures.System Design10 sectionsSystem design for interviews and real systems.

How to use these notes

Each topic starts with a simple real-life example, then gives the technical definition, the key points, why it matters, a short code example and a tip for interviews. Read a topic top to bottom once, then use the contents list to jump to the part you want to refresh before an interview.

Want questions instead of notes? See the top 50 interview questions and answers for each topic.

They cover frontend (HTML, CSS, JavaScript, TypeScript, React, Angular), backend and APIs (Node.js, Express, REST, JWT, GCP), databases (MongoDB, Mongoose, SQL) and design topics (OOP, data structures, microservices, system design).