Learn

Structured tracks that build from fundamentals to the depth an interview actually probes. Start anywhere; each lesson links to the problems and questions that exercise it.

Backend

MongoDB

117 lessons

Queries, aggregation pipelines and data modelling

Node.js

Coming soon

Event loop, streams, async patterns and performance

SQL

Coming soon

Joins, window functions and query planning

Redis

Coming soon

Data structures, caching strategies and expiry

Kafka

Coming soon

Topics, partitions, consumer groups and delivery guarantees

Infrastructure

Docker

Coming soon

Images, layers, networking and compose

AWS

Coming soon

Core services, IAM and deployment patterns

Computer Science

DSA

Coming soon

Data structures, algorithms and complexity

Low-Level Design

Coming soon

OOP, SOLID and design patterns applied

System Design

Coming soon

Scaling, storage choices and trade-offs