Quality and Testing Strategy Questions

Designing and implementing a holistic testing and quality assurance strategy that aligns with product goals, customer experience, and business risk. Candidates should be able to articulate a quality philosophy and trade offs between speed to market and product stability, define release criteria, and explain where and when different types of testing belong in the development lifecycle. Core areas include unit tests, integration tests, end to end tests, manual exploratory testing, building a test coverage plan and the test pyramid, and risk based testing and quality risk assessment to prioritize business critical flows. This also covers test automation strategy and selection of tests to automate, reducing flakiness and maintenance cost, test infrastructure and environment management, test data strategies, device and operating system compatibility testing, and observability and production monitoring including crash reporting and analytics to inform priorities. Candidates should be prepared to discuss shift left and continuous testing practices, how testing integrates with continuous integration and continuous deployment pipelines, gating and deployment considerations, defect prevention techniques such as code quality and static analysis, cross functional ownership of quality, and metrics and reporting to measure quality and guide improvements, such as test coverage, pass rates, mean time to detection, mean time to resolution, defect escape rate, and cost of quality. Interviewers may ask candidates to design a testing strategy for a feature or product area, prioritize tests and investments, justify trade offs given time and resource constraints, and describe how they would instrument monitoring and feedback loops for production issues.

EasyTechnical

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You're asked to present weekly quality metrics to a product manager. Name 6 to 8 metrics you would include (for example test pass rate, mean time to detection), explain why each matters for product decisions, and give a simple threshold or trend that would trigger action.

EasyTechnical

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Explain the test pyramid concept and, using a web application example (frontend, backend, database), describe which test types belong at each layer (unit, integration, API/integration, end-to-end, manual exploratory). For each layer include frequency, typical runtime, relative cost, and a short justification for placement.

HardTechnical

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Design an automated test selection system for pull requests that uses static call graphs, test-to-code mappings, test tags, code ownership, and historical failure data to run a minimal safe subset of tests. Describe architecture components, data collection pipelines, safety nets, and evaluation metrics for correctness and speed.

EasyTechnical

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You are defining release criteria for a small feature (search improvements) to be shipped to production. List measurable release criteria across testing, observability, performance, and business acceptance (for example tests pass, SLOs, telemetry thresholds). Explain how you would balance 'must-have' items versus 'nice-to-have' items when schedule is constrained.

MediumTechnical

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You have limited automation resources. For an e-commerce checkout flow (cart, payment, promo codes, order confirmation), explain which specific test cases you would prioritize for automation first using risk-based criteria. Define the criteria you use and propose a minimal day-one automated suite.

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