I applied through LinkedIn in Jan 2025.
Round 1 - Logical Reasoning OA
Basic Math questions and image pattern recognition questions
Round 2 - Code Signal OA
Key Value Store implementation which can have 2 keys. There were 4 levels. I don't remember all the questions exactly.
It's somewhat similar to Timemap question on leetcode but you will have 2 keys here.
https://leetcode.com/problems/time-based-key-value-store/description/
Example:
key1, sub_key1, timestamp = val1
key1, sub_key2, timestamp = val2
Questions were like :
return all values of key1
return latest value for key1, sub_key1
return value for key1, sub_key1 at a given timestamp
delete key
delete subkey
Round 3 - Foundational Interview
General Behavioral Round questions
Round 4 - Tech Execution Interview
Level 1:
Write an alternate iterator for list of lists. Similar to ZigZag Iterator on leetcode but you can have not just 2 but 'n' lists within the list;
https://leetcode.com/problems/zigzag-iterator/description/
Example :
lists = [[0, 1, 2], [], [3, 4], [5]]
output should be 0, 3, 5, 1, 4, 2
Level 2:
Write a range iterator. Should support negative step as well.
Example :
start = 0
end = 10
step = 2
output should be [0, 2, 4, 6, 8, 10]
Level 3:
Write a basic list iterator
list = [0, 1, 2, 3, 4, 5]
output should be 0, 1, 2, 3, 4, 5
Level 4:
Modify the class written in level1 to take list of iterator objects instead of lists and print the numbers in alternate fashion. The iterators list can contain both range iterator and list iterator.
Round 5 - Domain Interview
You will be given a list of transactions. You need to write a generic search api to filter on a combination of specific fields and values
Example :
transactions = [
{id: 1, time: 1, userId: 1, amount: 10},
{id: 2, time: 2, userId: 3, amount: 10},
{id: 3, time: 3, userId: 4, amount: 11},
{id: 4, time: 4, userId: 2, amount: 12},
]
Filters should support operations like "=", ">", "<" etc
The question is open ended. You need to decide how the input should look like.
Follow up :
Explain pagination and why we need it?
What are some of the techniques used for pagination?
How do you choose a cursor id column when using cursor based pagination?
Enhance your code to support cursor based pagination.
The interviewers were really nice. They were helping me whenever I got stuck. The recruiter too was good. He frequently gave me updates and feedback.
Compensation Details : https://leetcode.com/discuss/compensation/6413423/Coinbase-or-IC4-or-Bengaluru