Top 3 Quality attributes Interview Questions

Browse 3 real-world technical and behavioral interview questions about Quality attributes. Review scenarios, edge cases, and architectural best practices.

The business says the system must be highly available. How do you turn that into a number, and what does that number cost?

Convert the phrase into an error budget over a stated window, derived from what an outage costs the business rather than from a round number of nines. Each additional nine roughly multiplies cost, because it forces redundancy, cross-region failover and operational maturity that the previous nine did not need.

mediumdesign

A stakeholder tells you the system must be scalable. How do you turn that into a requirement you can design and test against?

Rewrite it as a quality-attribute scenario: a named stimulus arriving at a stated rate, hitting a stated system state, with a response measured at a percentile over a defined window. A number with a load figure, a duration and a named sacrifice is designable and testable; a list of maxima is not.

harddesign

Two quality attributes are in direct conflict and both stakeholders say theirs is non-negotiable. How do you resolve that?

Express both attributes as measurable scenarios, then lay out the intermediate designs so the choice is between numbers rather than adjectives. Where the conflict is genuinely irreducible, escalate to whoever owns both consequences and record what was sacrificed, with a trigger for revisiting.

hardscenario