The table below can be read mostly by the kind of interviews each tier performs. Top-tier companies don’t necessarily have more interviews, they have harder interviews.

Interview X Tier S A B C
Automated Coding Challenges ✅ ✅ ❌ ❌
Live Coding (easy/medium) ❌ ✅ ❌ ❌
Live Coding (hard) ✅ ❌ ❌ ❌
System Design ✅ ✅ ✅ ❌
Takehome (easy/short) ❌ ❌ ✅ ✅
Takehome (hard/lengthy) ❌ ✅ ✅ ❌
Technical Conversation ❌ ✅ ✅ ✅

This list is a guideline and the difficulty/pass-rate of the challenge has to be taken into account to assign the right Tier list.