Interview Questions
Key principles include: Modularity (feature modules), Component-based architecture, Dependency Injection, Separation of Concerns, Single Responsibility. Focus on maintainability, scalability, and reusability. Consider proper layer separation.
Structure using feature modules, core/shared modules, lazy loading. Implement proper folder organization, naming conventions. Consider scalability, maintainability. Follow LIFT principle (Locatable, Isolated, Focused, Testable).
Core Module contains singleton services, one-time imported components. Houses app-wide services, guards, interceptors. Should be imported only in AppModule. Ensures single instance of services.
Feature modules organize related components, services, pipes. Support lazy loading, encapsulation. Improve maintainability, testing. Consider domain boundaries, functionality grouping.
Smart components handle business logic, data. Presentational components focus on UI, receive data via inputs. Promotes reusability, separation of concerns. Consider component responsibility division.
Shared Module contains common components, pipes, directives. Imported by feature modules. Avoids code duplication, promotes reuse. Consider module size, import frequency.
State management through services (small apps) or NgRx/other state libraries (large apps). Consider data flow, state access patterns. Implement proper immutability, change detection strategies.
Service architecture: proper separation, single responsibility, injectable services. Consider service scope, dependency injection. Implement proper error handling, logging.
DDD through feature modules, domain services, entities. Organize by business domains. Consider bounded contexts, domain logic separation. Important for complex business applications.
Communication patterns: Input/Output, Services, State Management, Event Bus. Choose based on component relationship, data flow needs. Consider component coupling, maintainability.
Error handling through ErrorHandler service, HTTP interceptors. Implement centralized error logging, user feedback. Consider different error types, recovery strategies.
API integration: service layer abstraction, typed interfaces, proper error handling. Implement caching, retry strategies. Consider API versioning, security.
Micro-frontends through Module Federation, Custom Elements. Handle inter-app communication, shared dependencies. Consider deployment strategy, team organization.
Form patterns: Template-driven vs Reactive forms, form builders, validation services. Consider form complexity, validation requirements. Implement proper error handling, user feedback.
Security practices: XSS prevention, CSRF protection, secure authentication. Implement proper authorization, input validation. Consider security headers, secure configuration.
Route patterns: feature-based routing, guard protection, resolvers. Implement proper navigation, data preloading. Consider lazy loading, route parameters.
Performance optimization: lazy loading, change detection strategy, bundle optimization. Implement proper caching, virtual scrolling. Consider loading strategies, performance metrics.
Testing architecture: unit tests, integration tests, e2e tests. Implement proper test organization, coverage. Consider test pyramid, testing strategies.
i18n architecture: translation files, language services, locale handling. Implement proper text extraction, runtime translation. Consider cultural differences, formatting.
Auth patterns: JWT handling, guard protection, role-based access. Implement secure token storage, refresh mechanisms. Consider session management, security.
Component libraries: shared styles, documentation, versioning. Implement proper encapsulation, API design. Consider reusability, maintainability.
Dependency management: proper versioning, package organization, update strategy. Implement dependency injection, module organization. Consider bundle size, compatibility.
Logging architecture: centralized logging, error tracking, monitoring. Implement proper log levels, storage strategy. Consider privacy, performance impact.
Offline patterns: service workers, local storage, sync mechanisms. Implement proper caching, data persistence. Consider offline-first approach, sync conflicts.
CI/CD practices: automated testing, build optimization, deployment strategy. Implement proper environment configuration, versioning. Consider deployment automation, monitoring.
Code organization: proper folder structure, naming conventions, module organization. Implement feature-based structure, shared code. Consider scalability, maintainability.
Accessibility practices: ARIA labels, keyboard navigation, screen reader support. Implement proper semantic markup, focus management. Consider WCAG guidelines, testing.
Real-time patterns: WebSocket integration, polling strategies, state updates. Implement proper connection management, error handling. Consider scalability, performance.
Progressive enhancement: feature detection, fallback strategies, graceful degradation. Implement proper browser support, feature flags. Consider user experience, compatibility.