Software Developer

Profile: React.js

Location:  Mumbai

Experience Required: 2+ Years

Employment Type: Full-time

Required Skills & Qualifications

• Experience: Minimum 2+ years of professional experience in React.js development
• Core Technologies:Strong proficiency in JavaScript (ES6+)
• Extensive experience with React.js and its ecosystem
• Solid understanding of HTML5, CSS3, and responsive design
• Experience with state management libraries (Redux, Context API)
• Knowledge of modern build tools (Webpack, Vite, etc.)
• Familiarity with version control systems (Git)
• Technical Skills:Understanding of RESTful API integration
• Experience with testing frameworks (Jest, React Testing Library)
• Knowledge of modern CSS frameworks (Bootstrap, Material-UI, Tailwind CSS)
• Familiarity with TypeScript is a plus
• Understanding of performance optimization techniques

Job Summary:

We are looking for a passionate Frontend Engineer with 2 to 4 years of experience to build high-quality, scalable, and user-friendly web applications. You will work closely with cross-functional teams to bring ideas to life using modern JavaScript frameworks, maintaining best-in-class UI standards, performance, and code quality.

Website: https://www.thealteroffice.com/about

Key Responsibilities:

• Develop and maintain modern, high-performance, and responsive web applications using JavaScript frameworks such as React, Vue, or Next.js.
• Translate product designs from tools like Figma into pixel-perfect, accessible, and consistent UI components.
• Build reusable components and contribute to shared design systems or UI libraries.
• Manage state effectively using tools like Redux, Zustand, or Context API.
• Ensure applications are responsive, cross-browser compatible, and adhere to accessibility standards (WCAG).
• Optimize frontend performance using tools like Lighthouse, Web Vitals, and browser profiling.
• Use TypeScript to write type-safe and scalable code.
• Write unit, integration, and E2E tests using frameworks like Jest, Testing Library, Cypress, or Playwright.
• Work with backend teams to design APIs and ensure efficient, secure frontend-backend integration.
• Implement frontend security best practices, such as XSS protection and CSP.
• Use tools like Tailwind CSS, Framer Motion, and Styled Components for rapid, modern UI development.
• Contribute to CI/CD workflows, version control using Git, and deploy applications using platforms like Vercel, Netlify, or Firebase.
• Participate in code reviews, share knowledge, and help drive technical excellence across the team.

Requirements:

• 2 to 4 years of experience building and shipping frontend applications in a professional setting.
• Proficiency in JavaScript (ES6+), HTML5, and CSS3, with a strong understanding of modern frontend architecture.
• Hands-on experience with at least one JavaScript framework/library (React preferred).
• Strong knowledge of TypeScript and state management tools.
• Solid understanding of UI/UX best practices, including responsive design, performance, and accessibility.
• Experience with testing methodologies and automation tools.
• Familiarity with design systems, component libraries, and modern build/deployment tools (Webpack, Vite, Vercel, etc.).
• Comfortable working in agile teams, collaborating with designers, product managers, and backend engineers.

• Strong proficiency in React Native and JavaScript (ES6+).
• Experience with Redux, Context API, or other state management tools.
• Familiarity with TypeScript and strong understanding of mobile app architecture.
• Knowledge of native build tools like Xcode and Android Studio.
• Experience with RESTful APIs and third-party libraries.
• Familiarity with GraphQL is a plus.
• Hands-on experience in implementing pixel-perfect designs and animations.
• Proficiency in using libraries like React Navigation, NativeBase, or Material-UI.
• Experience with testing libraries like Jest, Detox, or Appium.
• Strong debugging skills using tools like Chrome DevTools, Flipper, or similar.
• Experience deploying apps to the App Store and Google Play Store, including managing certificates and provisioning profiles

Requirements

• 2.5+ years of experience in React JS and Redux
• Expert in React.j, ideally using TypeScript language extensions
• Good understanding of JavaScript Design Patterns
• Good experience writing front-end test cases
• HTML5, CSS3 and Responsive web design are mandatory
• Exposure to Scrum methodology and XP technical practices such as unit testing, pair programming, test-driven development, continuous integration or continuous delivery
• Self-motivated, fast learner, detail-oriented, team player and a sense of humour
• Should have experience with Payment(US) Integrations
• Should have experience with Ecommerce/ERP Connectors

Description:

Looking for a great JavaScript developer who is proficient with React.js. primary focus will

be on developing user interface components and implementing them following well-known

React.js workflows with Redux.

Requirements:

Experience with web technologies (REACT, REDUX, AJAX, SCSS/LESS/CSS,

Hooks,HTML)

Excellent conceptual understanding of DOM, JavaScript, HTML/CSS and cross browser

rendering, behavior and performance. The candidate should have high level knowledge

on user experience, asset loading, browser rendering, responsive design, state

management, JavaScript asynchronous patterns, request handling, partial page updates, and REST APIs

with AJAX

Experience implementing static typing in JavaScript (Babel, Typescript)

Familiar with TDD practices. Comfortable with Jest, Jasmine, Cypress, Webdriver.io,

and other automation frameworks to develop and keep the test suite up to date.

Familiarity with front-end build/publish tools, such as npm. Grunt/Gulp.js, Webpack,

browserify.js

Proficient understanding of code versioning tools, such as GIT.

Our company is seeking an Angular Developer who has the technical ability to implement user interfaces using JavaScript and the Angular framework. You will need to know the best practices and modern ways of creating interfaces and ensure the interface is able to interact with backend APIs. You will also need to have great communication and collaboration skills as you will need to interact with fellow frontend and backend developers regularly to ensure components can be integrated together.

As an Angular Developer at our company, you will:

• Work with other team members.
• Design and implement visually aesthetic user interfaces.
• Identify issues with front-end code and rectify them to remove bugs.
• Create unit tests to ensure code is functioning as expected.
• Create well-written documentation.
• Ensure front-end code is able to query APIs.
• Audit code to identify bottlenecks of performance and fix them.

Our ideal Angular Developer will have:

• The ability to problem-solve.
• High level of knowledge around the Angular framework and JavaScript.
• High-level knowledge of front-end interfaces.
• Fundamental knowledge of UX/UI.
• Fundamental knowledge of SEO.
• Good interpersonal skills

Kvantum is a career-changing opportunity where you will get to learn the latest and greatest marketing analytics for CPG, Retail, eCommerce, Pharma industry (to name few). At Kvantum, you will be part of a rapidly growing company. You will be able to make your mark; you’ll help write the story.  You will get the chance to go above and beyond, being a hero to your clients and to your team. You will get the chance to make a big impact, applying your coding skills, domain expertise to ready the most innovative marketing science product to Fortune 1000 customers.

What you’ll be doing in your new job:

 As a  Front End/UI Developer at Kvantum you will be working with incredibly talented, optimistic people in an environment that fosters innovation builds trust, and frequently erupts into laughter. You are a natural developer and enjoy helping team members in coding and development. You command respect from your superiors and also from peers. In this role, you’ll demonstrate a proven track record of developing enterprise-grade web frontends using technologies such as JavaScript, Ajax, XHTML and JSON. You'll join a team of exponential application developers who are working hard to develop our next generation SaaS marketing applications.

 Primary Responsibilities includes:

• Develop Proof-of-Concept and prototype applications using new technologies and frameworks. In addition to collaborating with internal teams and clients to create innovative solutions.
• Help establish GUI best practices and JavaScript frameworks for web development.
• Provide context and guidance for integration and implementation of Front-End Interfaces
• Translate wireframes, comps, and functional requirements into functional HTML/ CSS / Javascript.
• Develop standards-compliant mark-up and code for web sites and applications
• Develop JavaScript using standard Frameworks (jQuery, etc.)
• Develop small to medium size custom JavaScript libraries for reuse across the application
• Provide technology and implementation expertise to the domain, projects, or client
• Maintain leading-edge knowledge in emerging technologies and frameworks
• Participate in knowledge sharing and lessons learned sessions from project experiences

For this position, you must have:

• Expert JavaScript/HTML/CSS coding skills.
• 2-4 years of professional experience 
• Minimum 2 years of relevant experience in javascript 
• Minimum 1 year of relevant experience in React.js
• Hands-on experience with the implementation of different design patterns
• Proven experience of developing software using the Agile/SCRUM development methodology
• Command of web standards, CSS based design, cross-browser compatibility
• Experience to optimize the performance of the web application;
• Good understanding of page rendering, DOM manipulation, caching, REST API
• Experience of developing the application using  Test-driven Development(TDD)
• Experience of working on LINUX environment
• Attention to detail, Dedication, and Problem-Solving skills.

Nice to Have: 

• Working experience in any of  these technologies and frameworks: D3.js, Node.js, Express.js, Elasticsearch, GraphQL, Redis
• Experience working with start-ups.
• A good learning curve for new technologies.

We provide a competitive stipend and abundant opportunity for talented people to grow faster. Our people (as we call them Kvants) know how to celebrate success (monthly team events, quarterly company events, employee awards, etc.) and work smart to achieve desired goals.

Disclaimer:

Outside Recruiters: Kvantum prefers to recruit candidates directly. We do not accept unsolicited agency resumes. Please do not contact Kvantum employees with unsolicited resumes. Any resume sent by an outside agency without an explicit signed Kvantum generated agency agreement in place will be considered unsolicited and will not be eligible for payment.