Viber Data Scientist Interview Questions
The questions to prepare for a Viber Data Scientist interview. Questions from real interview reports rank first. Updated weekly.
Framework for using product data to identify and prioritize the user problem that should be solved first.
ViberDesign an A/B test for a new platform feature, including success metrics, power, guardrails, and a clear ship decision.
ViberExplain how supervised and unsupervised learning differ, and ground the distinction in a practical ML example.
ViberTests advanced SQL for causal-style metric comparisons around Viber feature launches using CTEs and windows.
ViberAggregate daily app events to report total events and distinct active users for a date range.
Viber
PoshmarkCompute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.
Meta
Spotify
Meta ITCalculate month-1 retention for January vs February signup cohorts using joins, date filtering, and aggregation.
Trideum
Zulily
eBayDesign a production ranking system with robust feature drift monitoring across batch and real-time features at high QPS.
ViberDiagnose a post-release KPI drop by separating instrumentation issues from real behavior changes and tracing the problem through the metric hierarchy.
ViberApproach for maintaining data quality and integrity across ETL pipelines.
ViberAssess whether a model has real predictive power using validation performance, calibration, and threshold behavior.
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