HackerRank Interview Questions
The questions to prepare for HackerRank interviews, across all roles. Questions from real interview reports rank first. Updated weekly.
Flatten a deeply nested JSON-like object into path-value pairs using recursion and deterministic key construction.
Rank the three most active HackerRank users in each challenge category using joins, GROUP BY, and ROW_NUMBER().
Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.
Total Wine & More
Inc.
Benjamin MooreRank the top 3 completed rides per vehicle per day using joins, a CTE, and ROW_NUMBER.
WaymoSign up to see every question
Create a free account to unlock this list and practice real interview questions.
Describe a time you had to choose between speed, quality, and scope, and how you aligned stakeholders around the trade-off.
Choose the most important launch metrics, balancing early signals, long-term outcomes, and a clear KPI hierarchy.
Identify the most important user pain points using both qualitative and quantitative data.
Explain how to engineer features for high-dimensional sparse data while controlling overfitting, dimensionality, and training cost.
Approach for monitoring a model in production and spotting drift, threshold issues, and calibration loss.
Design the ML system behind a real-time chat app, including message ranking, retrieval, serving, and feedback loops.