Debugging Interview Questions

12 real Debugging questions asked in live technical interviews — each with a model answer. Updated weekly.

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These Debugging interview questions were captured from real interviews by candidates using Assisting AI. Each links to a full model answer. For real-time help during your own interview, get Assisting AI from ₹500/day.

A bug appeared today but not yesterday. What would you do first?🟡 Medium · Debugging · Asked 1×Suppose the MCPC server normally spawns in 300 milliseconds, but suddenly a request takes more than 10 seconds. The database and other backends appear healthy. How would you investigate this?🟡 Medium · Debugging · Asked 1×Since I haven't heard about your hands‑on experience yet, can you explain how you typically debug and troubleshoot failures in Databricks notebooks during ETL processes?🟡 Medium · Conceptual · Asked 1×What would you do if your Spark job fails at 50% completion?🟡 Medium · Debugging · Asked 1×What would be the first step to check whether a query is getting executed?🟢 Easy · Debugging · Asked 1×Can you name any function that can be used in SpiceBug?🟢 Easy · Conceptual · Asked 1×We are processing a 1PB dataset on an MR cluster. The job is a join between a large sales dataset and a medium‑sized stores dataset. The job consistently crashes without a memory issue. Why do you think the executioner is failing?🔴 Hard · Debugging · Asked 1×Why might data quality checks fail silently?🟡 Medium · Debugging · Asked 1×Is this an issue? Is it a logging or observability issue, or something else that cannot be captured through logs?🟡 Medium · Debugging · Asked 1×What issues are present in the following Python code?🟡 Medium · Debugging · Asked 1×Let's say the API is failing in the UI. What are the steps one, two, and three to debug the issue?🟡 Medium · Debugging · Asked 1×One issue is that we are using 'm' but not passing any value to it.🟡 Medium · Debugging · Asked 1×

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