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.

Why does active-passive 'waste' the passive node's resources during normal operation?

Because the passive receives data and stays ready but doesn't serve client traffic, its compute capacity sits idle, The passive node runs 24/7, consuming power, memory, and compute. It receives replicated data and stays ready for failover. But under normal conditions, no client queries hit it, all that capacity is idle. Hot standby with read offloading partially addresses this by allowing read queries on the passive.

Your active node crashes. The failover mechanism promotes the passive. DNS TTL is set to 300 seconds (5 minutes). How long might clients experience an outage?

Up to 5+ minutes, even after promotion, clients keep connecting to the old IP until DNS TTL expires, The standby might be promoted in 10 seconds, but if DNS points to the old active's IP with a 5-minute TTL, clients won't discover the new IP until their cached DNS entry expires. This is why production HA setups use low TTLs (10-30 seconds) or virtual IPs that float between nodes.

After failover, the old active node comes back online. What's the safest next step?

Rebuild it as the new passive, replicating from the current active, it might have diverged, The old active might have accepted writes that never replicated to the (now promoted) passive. If you bring it back as active, you'd have split-brain, two nodes thinking they're the primary. The safe path is to rebuild it as a replica of the new primary, discarding any unreplicated writes.

Active-Passive Configuration

Name: System Design Masterclass
Availability: InStock

in Data Replication Distribution

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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