Apache Kafka processes trillions of events per day at companies like LinkedIn, Netflix, Uber, and Airbnb. Designing Kafka itself —

AI-powered knowledge bases (Notion AI, Confluence AI, Glean) answer questions by searching and synthesizing information from organizational documents. Designing a

Calendly automates scheduling for millions of professionals by eliminating the back-and-forth of finding a mutual time. Designing a scheduling platform

The technical interview is only half the battle — the other half is negotiating your offer. Engineers routinely leave $50K-$200K

Coinbase serves 100+ million users trading cryptocurrencies with $200+ billion in custodied assets. Designing a crypto exchange tests your understanding

GitHub Actions processes millions of workflow runs per day for millions of repositories. Designing a CI/CD platform tests your understanding

Electronic trading platforms process millions of orders per second with microsecond-level latency. Designing a trading system tests your understanding of:

WhatsApp Communities extends the messaging platform to support organizations with thousands of members — schools, neighborhoods, companies, and interest groups.

Shopify powers 4+ million online stores across 175 countries, processing $200+ billion in GMV annually. Designing a multi-tenant e-commerce platform

This is the definitive guide to preparing for technical interviews at top tech companies. Whether you have 1 month or

Booking.com connects 28+ million accommodation listings with hundreds of millions of travelers. Designing an online travel agency (OTA) tests your

Splitwise tracks shared expenses among friends, roommates, and travel groups — helping millions of users settle debts fairly. Designing an