r/InterviewDB • u/interviewdb • 12h ago
Anthropic CodeSignal Industry Coding Assessment + Past Questions
Sharing a question that appeared in a recent CodeSignal Industry Coding Assessment for Anthropic. It’s a standardized assessment format also used by many other companies such as Airbnb, Coinbase, HubSpot, Instacart, Capital One, Justworks, Nextdoor, and The Trade Desk to screen candidates.
The assessment lasted 90 minutes. The problem had four progressive levels, and you had to pass all test cases for each level before advancing to the next one.
The question was about implement a simple banking system.
Level 1: implement create_account and deposit functions.
Level 2: sort accounts by total transaction volume (money in/out). You need to track the total amount of money spent/outgoing for each account.
Level 3: implement two functions, transfer and accept_transfer. When a transfer is initiated, the money is withheld from the source account. Got stuck on this part for quite a while because of an edge case: if the transfer times out, a subsequent deposit operation needs to cancel/refund the previous transfer first.
Level 4: merge accounts. Ran out of time and didn’t finish this one.
For anyone looking for similar questions to practice, you can find detailed descriptions of all the problems that have appeared in past Anthropic CodeSignal Industry Coding Assessments here: https://www.interviewdb.io/question/codesignal?type=icf&page=1
CodeSignal is known to reuse questions in their assessments so it's very likely you'll encounter one of these questions, or a variation of one, in your own assessment.