System Design Interview with Omkar Warghade

Master System Design: From Fundamentals to Interview Confidence

This course is a complete, beginner-friendly guide to understanding system design and explaining it confidently during technical interviews. Every concept is taught in simple English, with clear examples, practical calculations, architecture diagrams, API designs, database models, trade-offs, and common interview follow-up questions.

The course starts with the fundamentals, so you do not need previous system design knowledge. You will first understand how the internet, servers, databases, APIs, caches, queues, load balancers, and distributed systems work. You will then learn how these building blocks are combined to design large-scale applications used by millions of people.

You will learn:

• How to gather functional and non-functional requirements
• How to estimate users, traffic, storage, bandwidth, and server capacity
• Horizontal and vertical scaling
• Load balancing, replication, partitioning, and sharding
• SQL and NoSQL databases and when to use each
• Database indexing and data modelling
• Caching strategies and cache failure problems
• Consistent hashing
• Message queues and event-driven architecture
• Content Delivery Networks
• Rate limiting and API protection
• Availability, reliability, scalability, and fault tolerance
• CAP theorem and data consistency models
• Monitoring, logging, retries, timeouts, and failure recovery
• Security, authentication, authorization, and data protection
• Choosing the right technology and explaining its trade-offs

You will also study 28 practical system designs, including URL shorteners, notification systems, chat applications, video streaming platforms, cloud file storage, search autocomplete, web crawlers, news feeds, distributed message queues, payment systems, digital wallets, stock exchanges, hotel reservations, nearby-location services, and many more.

Every system is explained using an interview-ready process:

1. Clarify the requirements.
2. Estimate the expected scale.
3. define APIs and data models.
4. Draw the high-level architecture.
5. Explain how each component works.
6. Identify bottlenecks and failure cases.
7. Improve scalability and reliability.
8. Discuss alternative solutions and trade-offs.
9. Answer common interviewer follow-up questions.
10. Present a clear final explanation.

The course includes a detailed 300+ page handbook containing professional architecture diagrams, worked examples, revision notes, interview checklists, a technical glossary, and more than 200 follow-up questions with clear answers.

This course is suitable for students, backend developers, full-stack developers, software engineers, and professionals preparing for product-based company interviews. It is especially helpful if system design feels confusing or if you know individual technologies but struggle to combine them into one complete architecture.

By the end of the course, you will be able to approach an unfamiliar system design question step by step, make sensible technical decisions, explain trade-offs clearly, handle follow-up questions, and communicate your design with confidence during an interview.