Under normal conditions, how does your system handle spikes in traffic, and what safeguards are in place to prevent overload?, Can you describe a situation where what actually happened was very different from what your monitoring dashboards initially suggested?, Have you ever seen a small configuration change end up causing a failure across several services? What was the root cause?, At what point in an incident did you realise that the issue was systemic rather than related to a single component?, Can you walk me through a case where the initial problem hit a timeout, and that timeout masked a deeper architectural flaw?, How do you usually distinguish between a transient error and a persistent infrastructure issue?, Have you experienced a situation where retry logic ended up increasing response time significantly instead of stabilising the system?, What kind of changes can unintentionally push the service over its limits, even if they seem harmless in isolation?, Can you think of an optimisation that was meant to improve performance but had the opposite effect in production?, In distributed systems, what factors tend to amplify minor issues and make them more severe?, Have you ever dealt with an issue that started in one microservice but spread across the system due to hidden dependencies?, When introducing new features, how do you ensure you don’t accidentally introduce something that might destabilise other components?, Can you describe an incident where a failure began in one layer and cascaded across services?, How do you design systems to prevent errors from cascading and creating a chain reaction across multiple services?, When analysing a post-mortem, how do you determine whether the increased load was the cause of failure or merely a symptom?.

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