Systematic Troubleshooting and Debugging Questions

Covers structured methods for diagnosing and resolving software defects and technical problems at the code and system level. Candidates should demonstrate methodical debugging practices such as reading and reasoning about code, tracing execution paths, reproducing issues, collecting and interpreting logs metrics and error messages, forming and testing hypotheses, and iterating toward root cause. Topic includes use of diagnostic tools and commands, isolation strategies, instrumentation and logging best practices, regression testing and validation, trade offs between quick fixes and long term robust solutions, rollback and safe testing approaches, and clear documentation of investigative steps and outcomes.

MediumTechnical

39 practiced

Your engineering team proposes a quick fix that reduces error rate by 80% but adds technical debt and may mask underlying issues. As Solutions Architect, how would you evaluate and present options (quick fix vs. refactor) to product management and the client? Include risk assessment, cost estimate, timeline, rollback plan, and proposed acceptance criteria.

HardTechnical

51 practiced

Create a high-level troubleshooting runbook template that you would deliver as part of a solution package for a customer. List the sections and contents to include (for example: quick reproduction steps, minimal telemetry to collect, common symptoms and workarounds, diagnostic commands, escalation matrix, and an example filled entry for a frequent issue). Explain why each section is important.

MediumTechnical

33 practiced

Write a shell one-liner (bash/awk/grep/sort) that scans rotated logs in /var/log/myapp/*.log and prints the top 10 most frequent error messages with counts. Assume error lines contain the word 'ERROR' and the message text follows after 'ERROR '. Explain your command and how it handles large files.

MediumTechnical

58 practiced

A customer's production environment reports intermittent HTTP 500 errors from a user-facing service that cannot be reproduced in staging. Provide a step-by-step debugging plan that minimizes customer impact: include targeted increased logging or trace sampling, traffic mirroring or replay options, usage of feature flags, safe experiment designs, and how to capture enough context to diagnose without exposing PII.

EasyTechnical

36 practiced

A regulated client asks for guidance on log levels and retention to balance debugging needs, storage cost, and compliance. Provide concrete recommendations for log levels (debug/info/warn/error), sampling strategies for high-volume sources, retention periods for each class, and policies to safely handle or redact PII in logs.

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