INTERACTIVE ENGINEERING FIGURES /// BUILT FOR INTERVIEWS

Stop reading about systems.
Run them.

Every chapter is a figure you drive: predict what happens, execute it, watch the machine react, keep the picture. HashMaps resize under your cursor. Thread pools reject your tasks. Garbage collectors sweep while you watch.

Start Java →Spring, early access

21 LIVE FIGURES★★★ RANKED BY REAL INTERVIEWS3 LEVELS PER FIGURE

COURSES

OPEN · INTERVIEW PREP MODE

Java

The language and the JVM: collections, strings, concurrency, memory, garbage collection. Every three-star interview chapter has a live figure.

ENTER→

EARLY ACCESS

Spring & Spring Boot

Proxies, transactions, and the N+1 problem, with the container's magic drawn as machinery you can step through.

ENTER→

IN PLANNING

System Design

Queues, caches, and consistency, enacted the same way: as figures that run.

COMING

IN PLANNING

awsAWS

The building blocks behind the console, from IAM to VPC networking.

COMING

IN PLANNING

Docker & Microservices

Images, layers, networks, and the failure modes of splitting a system.

COMING

IN PLANNING

C++

Memory, ownership, and the machine underneath the syntax.

COMING

MODE 1 /// INTERVIEW PREP · BUILDS FIRST

Chapters ranked by how often they come up in real interviews, most-asked first, rated ★★★ to ★. Finish a chapter's levels and you can answer it cold; prove it in a test-out and skip ahead.

MODE 2 /// COURSE MODE · FOLLOWS

The complete A to Z syllabus of each course, for learning from scratch in order. In production now.

Stop reading about systems.Run them.

Stop reading about systems.
Run them.