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.

Your primary server fails at 10:00:00. Health checks run every 10 seconds with a failure threshold of 3. DNS TTL is 60 seconds. What's the worst-case time before ALL users are routed to the secondary?

90 seconds. 30s detection + 60s TTL expiry, Detection takes 30 seconds (3 checks x 10 seconds each). Then DNS must update, but clients with cached responses keep hitting the dead primary until their cache expires, up to 60 seconds. Worst case: 30s + 60s = 90 seconds of some users hitting a dead endpoint.

Why is active-active failover faster than active-passive?

The standby in active-active is already running and warm, so there's no startup delay, In active-active, both regions are already serving traffic. When one fails, the other just absorbs more load, no cold starts, no cache warming, no connection pool bootstrapping. In active-passive, the standby might need minutes to reach full capacity.

Your /health endpoint returns 200 OK, but the database connection pool is exhausted and all queries are timing out. What happens with failover routing?

Failover does NOT trigger, the health check sees a healthy server, If the health check only verifies that the web server process is running (returns 200), it won't detect downstream failures like database issues. The server stays marked 'healthy' while serving errors to users. Always make health checks verify the full critical path, database, cache, essential dependencies.

Failover Routing

Name: System Design Masterclass
Availability: InStock

in Load Balancing Proxies

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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India

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Foundation lessons free, try before you buy

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

Anish K., Senior Engineer at a Bengaluru startup

All 766 interactive lessons

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