Structured learning for working developers

Learn the concept.
Practise the explanation.

Clear, connected learning paths for full-stack development, AI Engineering, DSA, system design, and technical interviews. Choose one focus and always know what to do next.

Choose a learning path Prepare for an interview

Simple explanations
Practical examples
Focused practice

YOUR LEARNING LOOP

01
Learn
Understand one concept with examples.
02
Explain
Turn knowledge into a clear interview answer.
03
Practise
Recall it without looking and find your gaps.
04
Apply
Use the idea in code and real decisions.

RECOMMENDED STARTS

Choose a clear starting point

Start with a complete path. You can change your focus at any time.

View all technologies

Problem solving

Data Structures & Algorithms

Learn the patterns behind interview problems, then implement them in JavaScript, Java, C#/.NET, or Python.

Start learning

AI Engineering

Build from LLM fundamentals to RAG, LangGraph agents, secure workflows, and production AI systems.

Start learning

Languages

JavaScript

Understand scope, functions, objects, and asynchronous execution.

Start learning

ONE CONNECTED EXPERIENCE

Move from reading to interview readiness

Build understanding

Follow ordered modules instead of collecting disconnected articles.

Explore learning paths

Prepare your answer

Review the questions interviewers ask and practise explaining the reasoning.

Open interview preparation

Test your recall

Use focused practice to reveal gaps, then return directly to the lesson.

Start focused practice

COMPLETE LIBRARY

Explore every technology and skill

Search or filter the catalog when you already know what you need.

Languages

JavaScript

Understand scope, functions, objects, and asynchronous execution.

Open learning path

Languages

TypeScript

Use types to model data, narrow values, and build safer interfaces.

Open learning path

Frontend

React

Understand rendering, state ownership, hooks, and performance.

Open learning path

Frontend

Next.js

Connect server rendering, routing, caching, and client boundaries.

Open learning path

Backend

Node.js

Understand the runtime and build reliable HTTP APIs.

Open learning path

Backend

Express

Trace middleware and handle failures across the request lifecycle.

Open learning path

Backend

NestJS

Learn dependency injection, validation, and application structure.

Open learning path

Databases

MongoDB & Mongoose

Model documents and reason about indexes, queries, and consistency.

Open learning path

Databases

SQL & PostgreSQL

Work through joins, transactions, query plans, and relational correctness.

Open learning path

Architecture

System design

Learn architecture trade-offs before tackling design scenarios.

Open learning path

Production

Security & performance

Protect application boundaries and investigate production failures.

Open learning path

Production

Testing

Choose useful tests and understand mocks, fixtures, and coverage.

Open learning path

Production

Git

Build confidence with branching, history, and recovery.

Open learning path

Production

Docker

Understand containers, images, networking, and safer builds.

Open learning path

Production

Delivery & cloud

Connect pipelines, cloud fundamentals, and deployment troubleshooting.

Open learning path

Engineering

Code review

Review unfamiliar code for correctness, security, and reliability.

Open learning path

AI Engineering

Build from LLM fundamentals to RAG, LangGraph agents, secure workflows, and production AI systems.

Open learning path

Problem solving

Data Structures & Algorithms

Learn the patterns behind interview problems, then implement them in JavaScript, Java, C#/.NET, or Python.

Open learning path

Architecture

Deterministic AI Workflows

Separate language understanding from business control to build reliable, auditable, and testable AI-assisted workflows.

Open learning path

AI Engineering

MCP Server with TypeScript

Learn MCP from protocol fundamentals to secure TypeScript servers, production deployment, portfolio projects, and interviews.

Open learning path

Content that connects the ideas

Lessons, interview questions, practice, roadmaps, and progress all share the same technology context.

How the platform is built

Learn the concept.Practise the explanation.

Choose a clear starting point

Data Structures & Algorithms

AI Engineering

JavaScript

Move from reading to interview readiness

Build understanding

Prepare your answer

Test your recall

Explore every technology and skill

JavaScript

TypeScript

React

Next.js

Node.js

Express

NestJS

MongoDB & Mongoose

SQL & PostgreSQL

System design

Security & performance

Testing

Git

Docker

Delivery & cloud

Code review

AI Engineering

Data Structures & Algorithms

Deterministic AI Workflows

MCP Server with TypeScript

Content that connects the ideas

Learn the concept.
Practise the explanation.