Lead Backend Developer Interview Questions

12,387 lead backend developer interview questions shared by candidates

Round 1 Difference between equals() and == in java? Questions on java streams. How to design springboot application - explain layered architecture Eager and Lazy loading question in springboot and react Pagination and sorting JPA repo related questions Round 2 Coding question - Insert, delete, get random, minimum element within constant time. Use List (linked list implementation) and Map. System design question - design a live dashboard which shows data coming in key value pairs metrics from cell towers and detect and notify incase of any anomalies. Also get recent data based on timelines - Use Cassandra DB for key value pairs data storage, async processing for anomalies detection, apache spark DB for retrieving data based on timestamps.
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Backend Software Developer

Interviewed at Nokia

4
Dec 9, 2025

Round 1 Difference between equals() and == in java? Questions on java streams. How to design springboot application - explain layered architecture Eager and Lazy loading question in springboot and react Pagination and sorting JPA repo related questions Round 2 Coding question - Insert, delete, get random, minimum element within constant time. Use List (linked list implementation) and Map. System design question - design a live dashboard which shows data coming in key value pairs metrics from cell towers and detect and notify incase of any anomalies. Also get recent data based on timelines - Use Cassandra DB for key value pairs data storage, async processing for anomalies detection, apache spark DB for retrieving data based on timestamps.

Generic question like overall experience and domain knowledge ( which I had). Tech round involved some deep dive on the system design topic like performance, including some not so difficult coding challenge. In the 'Meet the team' round they asked me some more technical questions but it was mostly informal.
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Senior Backend Engineer

Interviewed at Oviva

4
Aug 21, 2023

Generic question like overall experience and domain knowledge ( which I had). Tech round involved some deep dive on the system design topic like performance, including some not so difficult coding challenge. In the 'Meet the team' round they asked me some more technical questions but it was mostly informal.

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