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 is per key ordering easier to scale than global ordering?

Global ordering requires a single coordinator for all records, which is a single bottleneck, while per key ordering only needs each key to go through one consistent path, Global ordering across partitions requires a global coordinator to merge sort every record, which is a single point of bottleneck. Per key ordering only needs each key to flow through a consistent partition and a consistent subtask, which scales linearly with key count and is free if partitioning is set up correctly.

A reorder buffer with a 30 second watermark bound and 50,000 records per second ingress holds roughly how many records in flight?

1.5 million records, Buffer size is approximately the skew bound times the ingress rate. 30 seconds times 50,000 per second equals 1.5 million entries. This is cheap on a modern TaskManager but the number grows linearly with both the bound and the rate, so it is important to pick the bound deliberately rather than defaulting to a large number.

Which of these workloads benefits most from per key ordering?

Tracking a user's account balance through a sequence of deposits and withdrawals, Account balance tracking is a state machine: the order of deposits and withdrawals determines the current balance. Without per key ordering, a withdrawal might be applied before the deposit that funds it and the balance goes negative. The parsing, enrichment, and format conversion examples are stateless and do not care about ordering.

Out-of-Order Processing

Name: System Design Masterclass
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“The interactive diagrams alone are worth way more than the price.”

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