Real Frontend Developer Interview Questions (React, TypeScript, AWS, CI/CD, Micro Frontends) Asked in USA, UK, Canada & Australia

February 24, 2026

Real Enterprise Frontend Interview Questions – Today’s Round

These are real questions asked during a live frontend developer interview discussion.
Questions focus on real production experience, architecture thinking, performance, CI/CD, AWS, React ecosystem, and enterprise development practices.

1) Introduce yourself

10+ years of experience building enterprise web applications using React, TypeScript, Node, and cloud platforms. Strong focus on scalable UI architecture, reusable components, API integrations, CI/CD pipelines, and performance optimization in production systems.

2) React Native — which version and experience?

Worked with React Native across 0.6x–0.7x range in production apps for Android and iOS. Built screens, handled Redux state, async flows, API integrations, and optimized rendering performance for mobile environments.

3) When was the last time you used React Native?

Last used actively in production around 2022 in a mobile automotive-scale application where components, navigation, and state workflows were built and maintained.

4) Experience with micro frontend module federation & challenges?

Worked with domain-driven UI modules deployed independently.
Biggest challenges:

state sharing across modules
dependency version conflicts
auth token sync
performance from multiple bundles

Solution:

shell-level orchestration
minimal shared global state
event-driven communication

5) Module Federation – explain briefly

Allows independent frontend applications to share modules at runtime.
Host loads remote apps dynamically, enabling independent deployment and team ownership without rebuilding the entire system.

6) React functional vs class components

Functional components use hooks for state and lifecycle.
Class components rely on lifecycle methods and internal state.
Functional components provide:

cleaner code
reusable logic
better TypeScript integration
improved performance control

7) What are Hooks?

Hooks allow functional components to manage:

state
lifecycle
side effects
performance

Examples: useState, useEffect, useMemo, useCallback, useContext.

8) Hooks vs functional component — what capability added?

Functional component = UI rendering function.
Hooks = add state, lifecycle, reusable logic, performance optimization.

9) Handling complex state in large applications

Approach:

local state → hooks
feature state → reducer
global state → Redux Toolkit
server state → React Query

Focus on predictable state architecture and performance.

10) Repair Order Details module using React + TS

Built domain-driven UI with:

order header
service items
workflow status
approval logic

TypeScript used for strict data contracts.
React used for dynamic rendering and workflow-driven UI.

11) Why React? Why TypeScript?

React:

component-based
interactive UI
scalable architecture

TypeScript:

strong typing
fewer runtime errors
maintainability

12) AWS experience & deployment involvement

Used:

S3 + CloudFront for hosting
Cognito for auth
CloudWatch monitoring

CI/CD pipeline built artifacts and deployed automatically.

13) API security handling

Layered approach:

JWT/OAuth authentication
RBAC authorization
HTTPS enforcement
payload validation
rate limiting
logging and monitoring

14) REST vs GraphQL

REST:

resource-based
multiple endpoints
simpler

GraphQL:

client-driven queries
single endpoint
avoids over/under fetching

15) GraphQL caching

Handled via:

client-side normalization
resolver-level caching
persisted queries
Redis/in-memory cache

16) Code review approach

Focus areas:

architecture alignment
readability
performance impact
state flow
security
tests
production readiness

17) PR review — local vs GitHub?

Small PR → GitHub UI review
Complex PR → pull locally, run app, validate behavior

18) Merge conflicts — how handled?

Resolve locally, analyze logic from both sides, merge intent not lines, test app, validate flows.

19) Cherry pick in Git

Move specific commit from one branch to another without merging entire branch. Used for hotfixes and selective changes.

20) GitHub Actions — core components

workflows
events
jobs
runners
steps
actions
secrets

Used for build, test, deploy automation.

21) Passing secrets in workflows

Use encrypted GitHub secrets, injected at runtime, never stored in code. Prefer IAM roles / OIDC for enterprise security.

22) Secret deleted by team member — how handled?

restore secret
rotate credentials
check audit logs
restrict permissions
move to centralized vault

23) How to manage secrets intact?

Centralize in:

AWS Secrets Manager
Azure Key Vault
HashiCorp Vault

Use IAM roles and governance.

24) Performance improvement experience

Steps followed:

identify bottleneck
reduce re-renders
lazy loading
API optimization
caching
bundle optimization

25) Infinite render / page refresh issue

Caused by:

state loop
useEffect dependency loop
redirect logic
auth token validation loop

Debug via React profiler + network tab.

Incorrect dependencies cause: render → effect → state update → render loop.

27) Test coverage in project

Covered:

unit
component
integration
E2E
regression

Focus on business-critical workflows.

28) Other testing types beyond unit

integration
E2E
regression
performance
accessibility
smoke

29) Testing pyramid

Base: unit tests
Middle: integration
Top: E2E

Balance ensures speed + stability.

30) E2E vs Integration

Integration:

module interaction

E2E:

full user journey

31) Material UI experience & customization challenges

Worked on:

tables
forms
dialogs
navigation

Challenges:

theme overrides
performance
styling conflicts

32) Storybook — what is it?

Tool for building and documenting UI components in isolation.
Used for:

reusable component libraries
UI documentation
visual testing
design consistency

Closing

These questions reflect real enterprise frontend interviews focusing on architecture, production experience, and system thinking rather than theoretical knowledge.

Practical exposure to React, TypeScript, AWS, CI/CD, performance, and testing remains critical for modern frontend roles.

Need Real Frontend Interview Support?

If you are preparing for:

React Developer roles
TypeScript & Frontend Architecture interviews
Micro Frontend & Module Federation discussions
AWS Frontend Deployment (S3, CloudFront, CI/CD)
GitHub Actions & DevOps-integrated frontend roles
Performance optimization & debugging rounds
Testing strategy (Unit, Integration, E2E) interviews
API integration, GraphQL & REST architecture discussions

for opportunities in USA, UK, Canada or Australia

🌐 https://proxytechsupport.com
📞 +91 96606 14469

We provide real interview discussion support, practical preparation, and production-based frontend scenario training based on actual enterprise interviews.

Prepare with real questions.
Think in architecture.
Answer with production confidence.

Need Job Support or Interview Assistance?

Chat on WhatsApp