NielsenIQ is looking for a Senior Frontend Engineer who enjoys creating modern, fast, and scalable web applications using React.js. This position is ideal for professionals who love building responsive user interfaces, improving application performance, and collaborating with cross-functional teams to deliver exceptional digital products.

If you enjoy writing clean code, solving frontend challenges, and working with modern JavaScript technologies, this role offers an excellent opportunity to contribute to products used by businesses around the world.

Key Responsibilities

As a Senior Frontend Engineer, your day-to-day responsibilities may include:

• Develop responsive and interactive web applications using React.js.
• Build reusable UI components that improve development efficiency.
• Integrate frontend applications with Django REST APIs.
• Collaborate with backend developers to ensure smooth API communication.
• Implement responsive layouts that work across desktop, tablet, and mobile devices.
• Improve website speed, rendering performance, and overall user experience.
• Participate in code reviews and maintain high coding standards.
• Debug frontend issues and resolve browser compatibility problems.
• Work closely with UI/UX designers to transform designs into functional interfaces.
• Follow Agile development practices and collaborate with product teams.

Required Technical Skills

Successful candidates should have experience with technologies such as:

• React.js
• JavaScript (ES6+)
• HTML5
• CSS3
• React Hooks
• Redux or Context API
• REST API Integration
• Responsive Web Design
• Git & GitHub
• Component-Based Architecture

Having experience with the following technologies can be an added advantage:

• Django REST Framework
• MariaDB
• Docker
• CI/CD Pipelines
• Cloud Platforms

What You'll Be Working On

As part of the engineering team, you'll help build scalable frontend applications that deliver an excellent user experience. Your work may involve:

• Designing reusable React components.
• Connecting frontend applications with backend services.
• Optimizing application performance.
• Improving accessibility and usability.
• Maintaining consistent UI across different browsers.
• Reducing page load times through frontend optimization.
• Collaborating with designers and product managers to deliver new features.

Why This Role Stands Out

This opportunity offers much more than frontend development. You'll get the chance to:

• Work with modern React development practices.
• Collaborate with experienced engineers.
• Contribute to scalable enterprise applications.
• Learn backend integration concepts using Django APIs.
• Improve your knowledge of cloud deployment and CI/CD workflows.
• Build solutions that impact real-world business operations.

Who Should Apply?

This role is suitable for professionals who:

• Enjoy building modern React applications.
• Have experience developing responsive websites.
• Like solving UI performance challenges.
• Are comfortable working with REST APIs.
• Want to grow in a collaborative engineering environment.
• Are passionate about writing clean, maintainable code.

Career Growth Opportunities

Joining NielsenIQ can help you strengthen your expertise in:

• Advanced React.js Development
• Enterprise Frontend Architecture
• Performance Optimization
• API Integration
• Agile Software Development
• Cross-functional Team Collaboration
• Modern UI Engineering

The experience gained in this role can also prepare professionals for future positions such as Lead Frontend Engineer, Senior React Developer, Full Stack Engineer, or Frontend Architect.

1. What are React Components?
2. What is Component Reusability?
3. Explain React Lifecycle.
4. Difference between useEffect() and useLayoutEffect()?
5. What causes unnecessary re-rendering?
6. How do you optimize a React application?
7. What is Lazy Loading?
8. What are Higher Order Components?
9. Explain Controlled Components.
10. Explain Uncontrolled Components.
11. How do you secure API calls?
12. Difference between Authentication and Authorization?
13. Explain REST APIs.
14. What is Cross Browser Compatibility?
15. Tell us about one challenging frontend project you've worked on.

React.js

React.js is one of the most popular JavaScript libraries used for building interactive web applications. It allows developers to create reusable UI components, making applications easier to maintain and scale. A strong understanding of JSX, components, hooks, props, state management, routing, and performance optimization is expected for senior frontend roles.

JavaScript (ES6+)

Modern JavaScript forms the foundation of React development. Candidates should understand concepts such as:

• Arrow Functions
• Destructuring
• Spread Operator
• Rest Parameters
• Async/Await
• Promises
• Modules
• Closures
• Event Loop
• Callbacks

These concepts are commonly tested during frontend interviews.

React Hooks

Hooks simplify component logic and improve code readability.

Important Hooks include:

• useState
• useEffect
• useMemo
• useCallback
• useContext
• useRef
• useReducer

Knowing when and why to use each hook is an important frontend skill.

State Management

As applications grow, managing data across components becomes challenging.

Popular solutions include:

• Redux Toolkit
• Context API
• Zustand
• Recoil

For this role, experience with Redux or Context API is particularly valuable.

REST API Integration

Frontend applications frequently communicate with backend servers using REST APIs.

Developers should know how to:

• Send GET requests
• Create POST requests
• Update resources with PUT/PATCH
• Delete records
• Handle API errors
• Manage authentication tokens
• Display loading and error states

Responsive Design

A modern application should provide a consistent experience across desktops, tablets, and smartphones.

Key concepts include:

• Flexbox
• CSS Grid
• Media Queries
• Responsive Typography
• Mobile-first Design

Git

Version control is essential in collaborative software development.

Developers should be comfortable with:

• Clone
• Pull
• Push
• Commit
• Branch
• Merge
• Pull Requests
• Conflict Resolution

Performance Optimization

Frontend performance directly impacts user experience.

Common optimization techniques include:

• Code Splitting
• Lazy Loading
• Memoization
• Image Optimization
• Bundle Size Reduction
• Tree Shaking
• Caching
• Debouncing
• Throttling

Accessibility (A11Y)

Modern applications should be usable by everyone.

Important accessibility practices include:

• Semantic HTML
• Keyboard Navigation
• Proper Labels
• ARIA Attributes
• Color Contrast
• Screen Reader Support

Docker & CI/CD

Although optional for this role, understanding deployment workflows can help developers collaborate more effectively with DevOps teams.

Topics include:

• Docker Containers
• GitHub Actions
• Jenkins
• Azure DevOps
• Deployment Pipelines

If you're applying for this position, your resume should clearly highlight frontend development expertise instead of simply listing technologies.

Include measurable achievements

Instead of writing:

Developed React applications.

Write:

Developed scalable React.js dashboards serving 5,000+ users while reducing page load time by 35%.

Showcase real projects

Recruiters appreciate practical experience more than long lists of technologies. Include projects that demonstrate:

• React.js
• REST API Integration
• Authentication
• Dashboard Development
• State Management
• Responsive Design

Highlight frontend performance improvements

Mention contributions such as:

• Reduced bundle size
• Improved Lighthouse score
• Optimized rendering
• Reduced API response wait time
• Improved Core Web Vitals

Add GitHub Portfolio

Include links to:

• GitHub
• Portfolio Website
• Live Projects
• LinkedIn Profile

Recruiters often review practical work before scheduling interviews.

Keep your resume ATS-friendly

Use standard section headings such as:

• Professional Summary
• Technical Skills
• Projects
• Experience
• Education
• Certifications

Avoid excessive graphics, tables, icons, or multi-column layouts that can reduce ATS readability.