Ace Your Next Software Engineering Interview
Free software engineering interview practice quizzes across core computer science and system design topics: 10 questions, instant feedback, no account needed.
Which pattern reduces database load on repeat reads?
Pick a topic to begin
System Design
Database
Try one before you start
From the Data Structures & Algorithms set. Work out your answer, then reveal it along with the explanation.
What is the time complexity of searching in a balanced BST, and why?
Answer: O(log n)
Why it matters: A balanced BST has height O(log n). Each comparison eliminates half the remaining nodes, so at most O(log n) comparisons are needed to find any element.
Common questions
Is it free?
Yes, every quiz and explanation is free, with no paywall.
Is this for junior or senior roles?
The questions are written to mirror real entry-level software engineering interviews, and the concepts carry over to more senior rounds.
How many questions are in a quiz?
Each quiz is 10 questions and takes about 5 minutes, with an explanation after every answer.