Viridien Data Engineer Interview Questions

The questions to prepare for a Viridien Data Engineer interview. Questions from real interview reports rank first. Updated daily.

7questions

~1htotal time

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SQL & Data ManipulationStart here. 4 questions + 2 drills · ~59 min

Use DENSE_RANK to find every active employee earning the second highest distinct salary.

Explain how to run PostgreSQL schema migrations without downtime while preserving compatibility, integrity, and performance.

Explain ACID in Transaction SystemsEasy

Explain the four ACID properties and why they matter for reliable transaction processing in SQL systems.

acid propertiestransactionsdata integrityVViridien

Optimize a Slow SQL QueryMedium

Tests your SQL tuning skills, indexing strategy, and ability to reason about query plans.

database optimizationsqlVViridien

Audit PostgreSQL metadata for missing or invalid keys and tables with inefficient sequential-scan patterns.

Compare data lake assets with Delta tables and summarize committed operations demonstrating ACID behavior.

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Behavioral & Leadership3 questions · ~29 min

Disagreeing on a Technical DirectionMedium

Tests conflict resolution and influence during technical disagreement, including how you challenge decisions and commit after alignment.

Influence Without AuthorityConflict ResolutionteamworkVViridien

Handling Underperformance by a ColleagueMedium

Tests your approach to accountability, communication, and resolution with teammates.

Conflict ResolutionCommunicationteamworkVViridien

Your Background and ExperienceEasy

Tests the candidate’s overall UX/UI trajectory and relevance to Morningstar’s product work.

backgroundexperienceself introductionVViridien

The finish line: interview-readyComplete all 7 questions plus 2 hands-on drills to finish this plan.