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 shadow service returns an error for 15% of mirrored requests while the primary handles them fine. What's the correct response?

Investigate and fix the shadow service, This is what mirroring is designed to catch, This is the whole point of traffic mirroring, catching problems before they affect real users. 15% error rate on shadow traffic means 15% of your users would have seen errors if you'd deployed directly. Fix the issues in the shadow, re-validate, then proceed to a real canary deployment.

You mirror traffic to a shadow service that processes payments. What's the most dangerous risk?

The shadow could process real payments, charging customers twice, If the shadow service connects to real payment processors, mirrored requests will trigger real charges. Customers get billed twice. This is why shadow environments MUST stub out or sandbox all external services, payment processors, email senders, SMS gateways, third-party APIs.

Why is traffic mirroring typically done before traffic splitting in a deployment pipeline?

Mirroring validates correctness with zero user risk, building confidence for the real split, Mirroring lets you answer 'does this work correctly?' without risking any user experience. Once you've confirmed correctness through shadow testing, you move to splitting (canary) to answer 'does this perform well for real users?' It's a risk-reduction pipeline, validate first, expose to users second.

Traffic Mirroring

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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