Techolution Interview Questions
The questions to prepare for Techolution interviews, across all roles. Questions from real interview reports rank first. Updated daily.
Calculate each customer's 30-day rolling engagement average using a PostgreSQL window function.
Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.
Total Wine & More
Inc.
Benjamin MooreCreate an auditable application dataset by applying explicit PostgreSQL rules for missing candidate, status, salary, and date values.
Aircall
athenahealth
HaysIdentify the main pitfalls that can distort A/B test interpretation and explain how to guard against them.
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Approach for handling schema changes and data quality checks in a high-volume data lake pipeline.
Describe a difficult technical problem you solved, focusing on execution, stakeholder alignment, risks, and trade-offs.
Explain LLM hallucination and give three practical ways to reduce it using grounding, prompting, and evaluation.
Design a low latency RAG system over millions of documents, with scalable retrieval, ranking, generation, and production monitoring.
Define a success metric for a new feature that captures real user value, not just raw usage.
Diagnose a below-expectations product metric drop using decomposition, guardrails, and experiment checks.