HCL Tech Interview Questions
The questions to prepare for HCL Tech interviews, across all roles. Questions from real interview reports rank first. Updated weekly.
Find two indices in an array whose values sum to a target using a hash table in O(n) time.
Implement binary search to find a target in a sorted array in O(log n) time.
Explain how you decide which tests to automate versus keep manual, balancing risk, cost, and long-term maintenance.
Approach for maintaining data quality and integrity across ETL pipelines.
Tests ability to design and operate robust data pipelines with transformation and error handling.
Sort Thales Ground Master radar readings by signal strength in ascending order, placing unknown values last.
ThalesFind the top 3 users by completed transaction volume in the last 30 days using joins and aggregation.
Revolut
ChimeRank the top 10 ResMed myAir users in each region using joins, aggregation, and ROW_NUMBER().
ResmedEvaluates your system design skills for scalability, reliability, and performance under load.
Assesses your ability to tailor algorithm choices to strict memory limits.
Tests your ability to deliver a clear, relevant introduction tailored to the role at Aqr.
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