Learn with intent
Interview-grade courses for high-level design, low-level design, and the stack around them — built like products, not note dumps.
7
Live courses
100+
Guides & breakdowns
4
Languages in patterns
1
Hub to rule them
High Level Design
Core HLD course, technology deep dives, and full interview problem breakdowns — pick a track.
Low Level Design
SOLID, design patterns, the core LLD course, and full interview problem breakdowns — pick a track.
API Design
REST constraints, HTTP status and versioning, then gRPC and GraphQL — design contracts interviewers respect.
Build AI Agents
Learn to build AI agents from scratch — concepts, labs, and practical agent workflows.
Code (DSA)
Seventeen interview patterns plus jdfive special — curated aha problems with Java walkthroughs.
Java
Core Java, multithreading as a story, and Spring Boot — pick a track and learn in order.
Networking
Packets to HTTPS, DNS, load balancers, and reliability — explain every hop between browser and service.