ByteByteGo

What is on the platform

ByteByteGo turns the authors' books into online courses and adds new material over time. The catalogue includes:

• System design interview content from the two System Design Interview volumes, with worked designs such as rate limiters, key-value stores, chat systems and more
• Machine learning system design, covering areas like search and recommendation systems
• Generative AI system design, built around a seven-step framework and ten worked questions
• Mobile system design
• Coding and behavioural interview material

Courses are text with detailed illustrations rather than video, and you can view each curriculum before buying. The site also has a free library of short visual guides, and a separate live course programme. Check the site for current plans and pricing; courses are not refundable once bought, so read a free chapter first.

Why people choose it

The diagrams. System design is spatial, and most prose explanations make you build the picture yourself. Here each design shows where components sit, what flows between them and what changes as scale grows, which makes material easier to recall under pressure.

Compared with the printed books, you get everything in one place, the newer ML and GenAI courses, and ongoing additions. Compared with other courses, it leans towards breadth and clear visuals rather than deep dives into how a single component works internally.

How to use it well

• Start with the framework chapter and use it on every design. The consistent steps (scope, high-level design, deep dive, wrap-up) are what you practise.
• Before reading a worked design, spend thirty minutes attempting it yourself on paper or a whiteboard. Then compare. Reading alone builds recognition, not the skill.
• Keep a one-page note per design: the key requirement, the main bottleneck, and the trade-off that decided the design.
• Space it out over several weeks rather than cramming. A design or two a day is sustainable.

Where it falls short

Worked designs can encourage memorising answers. Interviewers often ask follow-ups that go below the diagram: how the database behaves during failover, what consistency a cache gives you. For that depth, pair it with Designing Data-Intensive Applications or Database Internals. And nothing replaces practising out loud with another person.

Common questions

Is it worth paying for if I own the books? Only if you want the newer ML, GenAI or mobile material, or prefer reading on the web with updates. The core system design content overlaps with the two books.

How long does it take? It depends on the courses you choose. As a rough plan, the classic system design content is manageable over four to eight weeks at a design or two a day, including your own attempts.

Is it enough on its own for a senior design round? Usually not. Add material on how storage, replication and consensus behave, and do mock interviews.

Is there a free way to judge it? Yes. The newsletter, the free visual guides and the free System Design 101 repository use the same illustration style, so you can see whether it suits you before buying.

Best for: engineers preparing for system design and ML design interviews who prefer visual, text-based courses.