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Java Technical Lead Interview Questions

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595 java technical lead interview questions shared by candidates

How and when do you secure data (login credentials) for phone / internet App in a Multi-tier Application. LRU cache implementation in Java. How can you find median of million numbers using multiple nodes - basically Merge Sort algorithm - How HashMap works internally in Java. Design database table/tables to store family tree and relations. A service depends on 2 sets of data from 2 different databases, but 1 database is lagging few seconds. Solve the use case. Explain one challenging task in you last project and how did you solve it.
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Java Tech Lead

Interviewed at Oportun

3.7★
May 5, 2016

How and when do you secure data (login credentials) for phone / internet App in a Multi-tier Application. LRU cache implementation in Java. How can you find median of million numbers using multiple nodes - basically Merge Sort algorithm - How HashMap works internally in Java. Design database table/tables to store family tree and relations. A service depends on 2 sets of data from 2 different databases, but 1 database is lagging few seconds. Solve the use case. Explain one challenging task in you last project and how did you solve it.

The test task asks to write the code finding "similar" HTML elements in given files. There is no definition of "similarity" in task description; they expect "similarity from the human point of view". There was 4 files provided (4 test cases). The task description explicitly says "Target completion time is 2 hours. We would rather see what you were able to do in 2 hours than a full-blown algorithm you’ve spent days implementing" and "remember that working software is the main goal so something simple that works is generally better, than a complex unfinished solution" They also asked to write detailed readme and to provide executable file. It was allowed to use libraries.
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Lead Java Developer

Interviewed at AgileEngine

4.5★
May 17, 2018

The test task asks to write the code finding "similar" HTML elements in given files. There is no definition of "similarity" in task description; they expect "similarity from the human point of view". There was 4 files provided (4 test cases). The task description explicitly says "Target completion time is 2 hours. We would rather see what you were able to do in 2 hours than a full-blown algorithm you’ve spent days implementing" and "remember that working software is the main goal so something simple that works is generally better, than a complex unfinished solution" They also asked to write detailed readme and to provide executable file. It was allowed to use libraries.

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