Choose a subject to explore its courses and lessons.
Master Java from core fundamentals to Java 21 — OOP, collections, streams, concurrency, JVM internals, and everything asked in backend interviews.
4 courses
Build production-grade REST APIs and microservices with Spring Boot 3 — dependency injection, Spring Data, Security, and cloud-native patterns.
3 courses
Crack coding rounds at FAANG and top product companies — arrays, trees, graphs, dynamic programming, and every pattern that actually appears in interviews.
4 courses
Design scalable distributed systems — from URL shorteners to Twitter feeds. Everything you need for senior-level system design interviews.
3 courses
From ML fundamentals to generative AI — a complete journey through modern AI.
3 courses
Deep-dive into SQL and NoSQL — indexing, transactions, ACID, replication, and the database questions that trip up mid-level engineers.
2 courses
Docker, Kubernetes, AWS cloud fundamentals, and the CI/CD, deployment, and production-operations practices that turn code into a running, reliable service.
1 course
The non-code skills that separate a senior engineer from a mid-level one — reviewing code well, giving feedback, mentoring, writing design docs, and communicating technical decisions clearly.
1 course
Experience-based Java interview preparation — every commonly asked question for freshers through senior and lead engineers, answered the way a strong candidate would: the short answer first, the key points, correct code, and the traps interviewers probe for. Each answer links to the lesson that teaches the topic in depth.
4 courses
