Skip to content
Skills
Problems
Questions
Drills
Roles
Skills
Interview
Contest
Leaderboard
Problems
Questions
Drills
Roles
Skills
Interview
Contest
Leaderboard
Home
/
Backend Developer
/
Questions
/
Transactions
Backend Developer
Transactions questions
6 questions on Transactions for backend developers, easiest first.
Easy
1
Atomicity in a money transfer
easy
Medium
1
Isolation levels and dirty reads
medium
Hard
4
Lost update on a wallet balance
hard
Saving to DB and publishing an event
hard
Deadlocks between two transfers
hard
Two doctors go off call at once
hard
