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 a KTable lookup return the wrong answer during a Kappa style replay from offset zero?

The KTable holds the current value, so historical events get enriched with today's data instead of the data that was valid when the event originally occurred, A KTable materializes the latest value per key. During replay, events from six months ago are joined against today's table state. If a user changed their subscription tier since then, every historical event gets the wrong tier. Temporal joins solve this by versioning the table by event time.

Why do production enrichment pipelines use CDC from Postgres into Kafka instead of querying Postgres directly on each event?

Direct lookups at high event volume overwhelm the database, while CDC lets the stream processor build a local copy and do lookups without any network call, A stream processing 100K events per second doing a Postgres lookup per event would need 100K queries per second from the database. CDC decouples the two. Debezium tails the WAL, publishes changes to Kafka, and the stream processor materializes the table locally. The database sees zero enrichment read traffic.

What happens if the Debezium CDC connector goes down for 30 minutes while the enrichment pipeline keeps running?

The local table becomes stale and events are enriched with outdated reference data for the duration of the outage, The pipeline keeps running against the last known state of the table. Any reference data changes that happened during the 30 minute outage are invisible. Events enriched during that window carry stale values. Once Debezium recovers and catches up, new events are correct but the window of stale enrichment is already in the output.

Stream-to-Table Joins

Name: System Design Masterclass
Availability: InStock

in Stream Batch Processing

This lesson is part of the full System Design Masterclass. Unlock it along with 765 other lessons for a one-time payment.

One-time payment. Lifetime access. No subscription.

Global

$19.99$7.99/lifetime

One-time payment via PayPal

Get Lifetime Access

Foundation lessons free, try before you buy

Founders price, locked for the first 10,000 customers

India Special

India

₹999₹499/lifetime

One-time via UPI, cards, or net banking

Get Lifetime Access

Foundation lessons free, try before you buy

Founders price, locked for the first 10,000 customers

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

Anish K., Senior Engineer at a Bengaluru startup

All 766 interactive lessons

Step-by-step animated diagrams

Live code editors with real execution

Quizzes with instant feedback

Completion certificates per level

Lifetime access, all future content included

The first 5 Foundation lessons are free, no payment needed. Try them now