Prepare one concept at a time.
Choose a technology, find the gaps, and practice an answer you can defend.
Choose your interview focus
Learn the fundamentals
JavaScript
Understand scope, functions, objects, and asynchronous execution.
TypeScript
Use types to model data, narrow values, and build safer interfaces.
React
Understand rendering, state ownership, hooks, and performance.
Next.js
Connect server rendering, routing, caching, and client boundaries.
Node.js
Understand the runtime and build reliable HTTP APIs.
Express
Trace middleware and handle failures across the request lifecycle.
NestJS
Learn dependency injection, validation, and application structure.
MongoDB & Mongoose
Model documents and reason about indexes, queries, and consistency.
SQL & PostgreSQL
Work through joins, transactions, query plans, and relational correctness.
System design
Learn architecture trade-offs before tackling design scenarios.
Security & performance
Protect application boundaries and investigate production failures.
Testing
Choose useful tests and understand mocks, fixtures, and coverage.
Git
Build confidence with branching, history, and recovery.
Docker
Understand containers, images, networking, and safer builds.
Delivery & cloud
Connect pipelines, cloud fundamentals, and deployment troubleshooting.
Code review
Review unfamiliar code for correctness, security, and reliability.
AI Engineering
Build from LLM fundamentals to RAG, LangGraph agents, secure workflows, and production AI systems.
Data Structures & Algorithms
Learn the patterns behind interview problems, then implement them in JavaScript, Java, C#/.NET, or Python.
Deterministic AI Workflows
Separate language understanding from business control to build reliable, auditable, and testable AI-assisted workflows.
MCP Server with TypeScript
Learn MCP from protocol fundamentals to secure TypeScript servers, production deployment, portfolio projects, and interviews.
Prepare your engineering stories.
Use your real experience to explain ownership, decisions, and failures.