I applied online. The process took 1 week. I interviewed at Vonage (Barcelona) in Oct 2025
Interview
I was rejected after the first interview, a "pair programming". It was run by a manager, and they intended me to code a simple function in Java on a Google Docs. I offered to do it on my local IDE and share my screen which was accepted. I was not given any feedback at all as to why I was rejected.
Interview questions [1]
Question 1
Code a simple function in Java in a Google Docs document.
I applied through a recruiter. I interviewed at Vonage (Bengaluru) in Feb 2024
Interview
Coding plus design discussion
debug the performance of application if latency is becoming high, what all metrics to monitor
Scale application,
metric to monitor
synchronization in java
multithread safe data structures in java
Interview questions [1]
Question 1
Have 2 apis
one to add balance in wallet
second to deduct balance from wallet
one request comes at beginning of day to add balance
multiple frequent requests throughout the day to deduct balance
Which datatype would you take to store balance till 2 decimal places and thread safety
Concurrent datastructures in java vs AtomicReference
Scale it for multiple users
I applied online. The process took 1 day. I interviewed at Vonage in Nov 2023
Interview
After applying online, I had a 20 minutes talk with a recruiter (which I thought was fine, I usually pass this level). He explained about the next steps, but I never heard from them again. Not even a generic rejection email.
