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Publicis Sapient is a digital transformation partner helping established organizations get to their future, digitally enabled state, both in the way they work and the way they serve their customers. We help unlock value through a start-up mindset and modern methods, fusing strategy, consulting, and customer experience with agile engineering and problem-solving creativity. United by our core values and our purpose of helping people thrive in the brave pursuit of next, our 20,000+ people in 53 offices around the world combine experience across technology, data sciences, consulting, and customer obsession to accelerate our clients’ businesses through designing the products and services their customers truly value.

We are looking for a Senior React Developer with strong fundamentals in modern React, state management, and testing. This role requires hands-on experience building React applications from scratch, explaining implementation decisions clearly, and solving problems in real time. Candidates should be comfortable articulating both what they are building and why.

Your Impact:

• Develop and maintain React applications using modern React features and best practices
• Configure and work with Webpack for bundling, optimization, and environment setup
• Implement Redux for global state management, including actions, reducers, and store configuration
• Design and implement authentication flows from scratch (token handling, protected routes, session management)
• Build reusable components, custom hooks, and shared utilities
• Write and maintain unit tests and contribute to automated test suites
• Participate in code reviews and explain implementation choices clearly
• Debug and refactor existing React code to improve correctness, performance, and readability

Your Skills and Experience:

React & JavaScript

• Strong understanding of React fundamentals and internals
• Knowledge of latest React features (React 19), including concurrent concepts
• Hands-on experience with hooks such as:
• useState, useEffect, useMemo, useCallback
• useTransition
• Context API
• Ability to identify and fix common React issues (incorrect JSX returns, component rendering mistakes, lazy loading pitfalls)

State Management

• Practical experience with Redux
• Creating reducers, actions, and dispatch flows
• Connecting Redux state to React components
• Updating application state through Redux in real use cases (e.g., counters, forms)

Build & Tooling

• Experience with Webpack
• Configuration basics
• Loaders, plugins, and build optimization concepts

Testing

• Experience implementing unit tests for React components
• Familiarity with testing tools such as:
• Jest
• React Testing Library (or equivalent)
• Exposure to test automation frameworks and CI-friendly testing practices

Performance & Code Quality

• Experience using lazy loading (React.lazy) and understanding required supporting patterns (e.g., Suspense)
• Ability to write clean, maintainable, and performant code
• Strong debugging skills and understanding of JavaScript/React execution flow

Practical Expectations (Technical Interview-Level)

Candidates should be able to:

• Analyze broken React code and explain what is wrong and how to fix it
• Identify missing pieces in lazy loading and async rendering setups
• Write a React Context implementation from scratch
• Build a Redux-powered component without scaffolding tools
• Create a custom data-fetching hook using useEffect, useMemo, and useCallback
• Code in a plain editor while explaining reasoning step by step

Set Yourself Apart With:

• Experience working in enterprise-scale React applications
• Familiarity with secure frontend authentication patterns
• Exposure to performance optimization in large React apps

• An inclusive workplace that promotes diversity and collaboration.
• Access to ongoing learning and development opportunities.
• Competitive compensation and benefits package.
• Flexibility to support work-life balance.
• Comprehensive health benefits for you and your family.
• Generous paid leave and holidays.
• Wellness program and employee assistance.

As part of our dedication to an inclusive and diverse workforce, Publicis Sapient is committed to Equal Employment Opportunity without regard for race, color, national origin, ethnicity, gender, protected veteran status, disability, sexual orientation, gender identity, or religion. We are also committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. If you need assistance or an accommodation due to a disability, you may contact us at hiring@publicis.sapient.com