QA Interview Hub · Knowledge base · Quizzes

Knowledge base

Playwright

• Architecture and isolation
• Browser, Context, Page
• Locators
• Auto-waiting and web-first assertions
• Interaction: actions, tabs, frames, files, dialogs
• Fixtures and test structure
• Network: route, mocks, API tests
• Authentication and storageState
• Config, projects, parallelism, CI
• Debugging, trace viewer, reports, flaky tests
• Emulation and environment

Cypress

• Basics and architecture
• Command queue and asynchrony
• Retry-ability, waiting, timeouts
• Locators and working with the DOM
• Network: cy.intercept
• API testing
• State, sessions, isolation
• Framework architecture
• CI, parallelization, reports
• Cypress vs Playwright
• Outdated-answer traps
• Extra questions from common lists

TypeScript

• Basics: primitives, any, unknown, never, literals
• Object types: interface and type, optional, readonly
• Type narrowing and type guards
• Generics
• Utility types
• Classes and access modifiers
• Asynchrony: Promise, async/await, parallelism
• Advanced types: keyof, typeof, mapped, conditional, template literal
• Modules and tsconfig
• JS traps: numbers and money, strings, dates, objects and arrays

Manual QA

• Testing basics
• Types of testing
• Test design techniques
• Test documentation
• Bugs
• Processes and Agile
• Web and client-server
• Manual API testing
• SQL for QA
• Fintech specifics
• Quality metrics
• AI in testing
• Situational questions

SQL

• Database basics
• SELECT and filtering
• Aggregation
• JOIN
• Subqueries, CTEs, set operations
• Changing data and transactions
• Database structure
• Window functions
• SQL in QA work
• Interview tasks

API

• Client-server and REST
• Anatomy of a request and response
• HTTP methods and idempotency
• Status codes
• Postman: structure and variables
• Authentication and authorization
• Scripts and checks in Postman
• Runner, data-driven tests and Newman
• Checklist: what to test in an endpoint
• Interview questions in brief
• API design: resources, pagination, versioning, GraphQL
• Headers, caching and CORS
• API security
• Documentation and contracts: OpenAPI, JSON Schema, contract testing
• Performance and reliability
• gRPC
• Contract testing in practice

System Design

• How to answer a System Design interview
• Test framework architecture
• Test data and environments
• CI/CD, parallelization and sharding
• Stability and flaky tests
• Reporting, metrics, observability
• Backend basics: LB, cache, DB, queues
• Microservices and test strategy
• Scaling and reliability

Patterns

• Page Object Model
• Page Component and composition
• Fixtures as Dependency Injection
• Builder and Test Data Builder
• Factory and data factories
• Facade, Steps and App Actions
• Strategy
• Singleton and global state
• Screenplay: an overview
• SOLID, DRY, KISS in tests, and anti-patterns

CI/CD

• Pipeline and quality gates
• GitHub Actions for a test framework
• Docker for automated tests
• CI reports, artifacts and metrics

Product Engineering

• Product thinking for QA
• Product metrics and analytics
• A/B tests and feature flags
• Safe releases and production feedback

AI

• LLM basics: tokens, context, model
• Prompts, RAG, tools, agents, MCP
• How to test an LLM agent
• Safety, quality and metrics

Networking

• TCP/IP and the path of a request
• HTTP versions and infrastructure
• WebSocket, SSE and real-time
• Networking in QA work

Logs and observability

• Logs for a QA
• Observability: logs, metrics, traces
• Tools and queries
• Logs in automation