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  • Free courses

    The full library, with every lesson unlocked.

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    One long-form engineering essay, every week.

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    Fast explainers and deep dives you can watch in one sitting.

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    Deep investigations into the systems behind Google, AWS, Cloudflare, and more.

Courses

A taste of what's inside

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14 hrsSystem Design

System Design

Design systems that hold up under load, failure and five years of change.

Level: Advanced46 lessonsView path
11 hrsSoftware Architecture

Software Architecture

Boundaries, layering and the decisions that decide how changeable a codebase is.

Level: Advanced39 lessonsView path
7 hrsAPI Design

API Design

REST, RPC and events — designing interfaces you will not regret shipping.

Level: Intermediate29 lessonsView path
13 hrsAlgorithms & Data Structures

Algorithms & Data Structures

The reasoning behind complexity, so you pick the right structure without guessing.

Level: Intermediate54 lessonsView path
6 hrsTesting & Quality

Testing & Quality

A test suite that catches real bugs and still runs before your coffee lands.

Level: Intermediate27 lessonsView path
10 hrsDocker & Kubernetes

Docker & Kubernetes

Containerise, deploy and operate services without cargo-culting YAML.

Level: Intermediate42 lessonsView path
5 hrsObservability

Observability

Logs, metrics and traces that answer questions at 3am instead of adding noise.

Level: Intermediate23 lessonsView path
12 hrsProgramming Foundations

Programming Foundations

The language-agnostic core: types, memory, concurrency and control flow.

Level: Beginner51 lessonsView path
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