Is this a video course?

No. This is an interactive, slide-based learning platform. Each lesson has rich text, animated diagrams, live code editors, and quizzes. You learn by reading, interacting, and doing, not by watching videos passively.

How long do I have access?

Forever. Both pricing tiers are one-time payments with lifetime access. This includes all current 766 lessons and any future content we add.

What level of experience do I need?

None. We start from absolute basics like 'What is latency?' and build up to distributed consensus protocols. The Foundation level assumes zero prior knowledge of system design.

How much does the system design course cost?

7.99 US dollars for lifetime access globally, or 499 Indian rupees for lifetime access in India. One-time payment, no subscription, no hidden fees. 11 lessons are free with no signup required.

What technologies are covered?

Everything from DNS and load balancers to Kubernetes, Kafka, distributed databases, consensus protocols, stream processing, security architecture, and observability. We cover principles and real-world implementations used at Netflix, Google, Amazon, Uber, Stripe, and more.

Is this useful for system design interview preparation?

Yes. The lessons are structured around the exact topics asked in system design interviews at FAANG and top-tier companies. Interactive diagrams help you practice whiteboard-style explanations. Covers everything from URL shortener design to distributed payment systems.

How is this different from ByteByteGo or Educative?

766 interactive lessons (4x more than most competitors), 16 different diagram types that build step by step, real production examples from Netflix, Google, Amazon, Uber, and Stripe, and lifetime access for a one-time payment of $7.99 instead of annual subscriptions costing 100 to 200 dollars per year.

A user posts a comment on a site with a primary-replica database setup. The page reloads and the comment is missing. What happened?

The write went to the primary, but the reload read from a replica that had not replicated the new comment yet, This is the classic read-your-writes violation. The write hit the primary, but the subsequent read was load-balanced to a replica still lagging behind. The user's own comment has not replicated to that replica yet.

GitHub uses a 5-second write-hint cookie to fix this. What happens after the 5 seconds expire?

The system switches to eventual consistency and reads go back to replicas, After the cookie expires, reads go back to replicas. By that point, MySQL replication has almost certainly caught up (typical lag is under 1 second), so the user sees their own write even from a replica.

Why does a CDN edge cache break read-your-writes even when the database layer handles it correctly?

The CDN edge in a remote PoP may still serve a cached version of the old page that was generated before the write, Even if the database gives you read-your-writes, a CDN edge node in Tokyo may still serve HTML cached before your write. You need to purge the cache entry on write (Cloudflare instant purge, Fastly surrogate keys) or use cache-busting query parameters.

Read-Your-Writes

Name: System Design Masterclass
Availability: InStock

in Consistency Models

This lesson is part of the full System Design Masterclass. Unlock it along with 765 other lessons for a one-time payment.

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Foundation lessons free, try before you buy

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India

₹999₹499/lifetime

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Foundation lessons free, try before you buy

Founders price, locked for the first 10,000 customers

“The interactive diagrams alone are worth way more than the price.”

Anish K., Senior Engineer at a Bengaluru startup

All 766 interactive lessons

Step-by-step animated diagrams

Live code editors with real execution

Quizzes with instant feedback

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Lifetime access, all future content included

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