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.

100 customers click 'Buy Now' simultaneously for a product with 50 units in stock. Without any concurrency control, what happens?

All 100 orders succeed, resulting in 50 oversold units that must be cancelled later, Without atomic inventory checks, the classic read-modify-write race condition occurs. All 100 threads read 'quantity = 50', all decrement to 49, and all succeed. The actual stock goes to -50. This is why atomic operations (UPDATE ... WHERE quantity >= requested) or Redis Lua scripts are essential for inventory management.

Your product search uses Elasticsearch. A user searches for 'running shoes' and gets results ranked by text relevance. The top result is a poorly rated shoe with few sales. How do you improve the ranking?

Combine text relevance with sales velocity, conversion rate, and seller quality in the scoring function, E-commerce search ranking is multi-signal. Text relevance alone is insufficient, a product might match the query perfectly but be terrible. Incorporating sales velocity, conversion rate, seller quality, and availability into the scoring function surfaces products that users actually want to buy, not just products that contain the right keywords.

During checkout, the payment service charges the customer's card successfully, but the order creation service fails. What should the saga orchestrator do?

Execute compensating transactions: refund the card and release reserved inventory, The saga pattern requires compensating actions when a step fails. Since payment succeeded but order creation didn't, the system must refund the charge and release inventory. The customer should see a clean error message and be able to retry. Retrying order creation indefinitely risks leaving money in limbo. Never leave the customer in an ambiguous state.

Your cart is stored in Redis with a 30-day TTL. Redis runs out of memory during Black Friday. What happens to customers' carts?

Redis evicts the oldest carts using LRU, and affected users recover from the database-synced copy, With maxmemory-policy set to allkeys-lru (as it should be for a cache), Redis evicts least recently used keys when memory is full. Customers whose carts were evicted will be served from the last database-synced copy (slightly stale but better than empty). This is why carts are asynchronously persisted to durable storage.

Design an E-Commerce Platform

Name: System Design Masterclass
Availability: InStock

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

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