
Job Title: Senior React.js Developer
Experience: 5+ Years
Location: Pune
Employment Type: Full-Time
Job Summary:
We are looking for a skilled React.js Developer with 5+ years of experience to join our team. You’ll build scalable, high-performance web and mobile applications, work closely with designers and backend developers, and ensure responsive and user-friendly UI/UX across platforms.
Key Responsibilities:
- Develop dynamic, reusable components using React.js, JavaScript, HTML5, and CSS3
- Integrate wireframes and UI/UX designs into functional front-end interfaces
- Ensure cross-browser/platform compatibility and responsive design
- Optimize apps for speed and scalability
- Implement and maintain unit and E2E tests (Jest, Playwright, Puppeteer)
- Integrate with RESTful APIs and backend services
- Maintain code quality and performance standards
- Collaborate with designers, product managers, and backend engineers
- Mentor junior developers and contribute to best practices
Required Skills:
- 5+ years in front-end/UI development
- Strong in React.js, JavaScript (ES6+), HTML5, CSS3
- Experience with Redux, SASS/LESS, REST APIs
- Familiarity with performance optimization tools
- Solid understanding of UI/UX design principles
- Excellent communication and team collaboration skills
- Bachelor’s degree in Computer Science or related field

About Wissen Technology
About
The Wissen Group was founded in the year 2000. Wissen Technology, a part of Wissen Group, was established in the year 2015. Wissen Technology is a specialized technology company that delivers high-end consulting for organizations in the Banking & Finance, Telecom, and Healthcare domains.
With offices in US, India, UK, Australia, Mexico, and Canada, we offer an array of services including Application Development, Artificial Intelligence & Machine Learning, Big Data & Analytics, Visualization & Business Intelligence, Robotic Process Automation, Cloud, Mobility, Agile & DevOps, Quality Assurance & Test Automation.
Leveraging our multi-site operations in the USA and India and availability of world-class infrastructure, we offer a combination of on-site, off-site and offshore service models. Our technical competencies, proactive management approach, proven methodologies, committed support and the ability to quickly react to urgent needs make us a valued partner for any kind of Digital Enablement Services, Managed Services, or Business Services.
We believe that the technology and thought leadership that we command in the industry is the direct result of the kind of people we have been able to attract, to form this organization (you are one of them!).
Our workforce consists of 1000+ highly skilled professionals, with leadership and senior management executives who have graduated from Ivy League Universities like MIT, Wharton, IITs, IIMs, and BITS and with rich work experience in some of the biggest companies in the world.
Wissen Technology has been certified as a Great Place to Work®. The technology and thought leadership that the company commands in the industry is the direct result of the kind of people Wissen has been able to attract. Wissen is committed to providing them the best possible opportunities and careers, which extends to providing the best possible experience and value to our clients.
Connect with the team
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Must Haves:
- Experience developing enterprise-grade quality software.
- 3+ years of experience building large-scale front-end applications using React.
- 3+ years of experience using type-safe JavaScript-based languages, such as TypeScript.
- Understanding of modern frontend ecosystems, including Bundling(preferably using vite) Linting, Testing, Releasing.
- Success with mentoring mid-level & junior Engineers.
- Experience in Agile software development methodologies.
- Experience writing automated tests (e.g., Vitetest, Cypress, Jest, Testing Library).
- Experience in building, scaling & maintaining a design system from scratch.
- Experience in improving rendering as well as delivery performance for front-end applications.
- Experience in writing semantic HTML.
- Experience in building scalable, responsive, and cross-browser-compatible web applications.
- Experience in a peak-performance organization, preferably a tech startup.
- Experience working with a remote team.
- Data analysis experience, and understanding of how analytics can help with product decisions.
Bonus:
- Experience building integrations and data synchronizations with event pub/sub-models.
- Experience with WebGL
- Experience in building offline applications using Web Workers
- Open source contributions.
- Running his/her own blog.
- Experience with building 100% keyboard and screen reader-accessible applications.
- Experience setting up and customizing JavaScript tooling and building systems.
What does the role look like?
Software Development Engineers FE will be responsible to participate in all stages of the software product development life cycle. This will include analyzing system and user requirements, designing software flowcharts, creating user interfacing applications (Web Or Mobile) , troubleshooting bugs, and running tests to improve system functionality.
An ideal candidate would be someone who has proficiency in Flutter and JavaScript frameworks, good analytical skills, the ability to anticipate issues and frame remedial actions, and excellent teamwork skills.
What will you be doing?
● Write simple, efficient, and maintainable code.
● Design, develop, scale and maintain User Application written in JS or Dart.
● Manage individual priorities, deadlines, and deliverables.
● Validating the functionality and security of the application.
● Function well in a fast-paced, rapidly changing environment
● Ensuring best coding standards and practices to improve and maintain quality.
● Meeting with the engineering and product team to discuss project definitions and goals.
What will you need ?
● Bachelor/Master degree in CS or related field from a reputed college
● Sound knowledge of JavaScript or Flutter technologies.
● Solid grip on the programming basics like DS and algorithms, OOPS.
● Understanding & experience with restful APIs and microservice architecture
● Prior experience in start-ups or health-tech will be a plus
Strong hands-on experience with ReactJS, Redux, TypeScript, HTML, Bootstrap, Material UI, CSS3/SCSS, Webpack, NPM, NVM, Visual Studio Code
Knowledge/Experience on Restful APIs integration.
Unit testing with Jasmine or an equivalent framework
Experience or Knowledge in developing complex reusable component libraries such as complex grids, spreadsheet components etc.,
Strong in UI/UX standards implementation
Understanding of browser fundamentals and Page Optimizations
Experience working with Git and Azure
UI Developer Responsibilities:
- Work with other developers to ensure that the website is functional and visually appealing.
- Liaise with the client to gauge their needs and expectations.
- Plan the layout of the website.
- Ensure that the website is optimized for various devices.
- Use analytics to test client enjoyment.
UI Developer Requirements:
- Proficiency in HTML, JavaScript, jQuery, and CSS.
- Knowledge of Adobe Illustrator.
- Good interpersonal skills.
- Understanding of key design principles.
- Good problem-solving skills.
- Developing new user-facing features.
- Working alongside product to understand our requirements, and designing, developing and iterating, thinking through the complex architecture.
- Writing clean, reusable, high-quality, high-performance, maintainable code.
- Ensuring the technical feasibility of UI/UX designs and optimizing applications for maximum speed.
- Researching and applying new technologies, techniques, and best practices.
What you need to have:
- Experience in working on frameworks like React and VueJS
- Excellent teamwork skills, flexibility, and ability to handle multiple tasks.
- Strong understanding of Object-Oriented Programming, Data Structures, and Algorithms .
- Strong knowledge of Javascript, HTML5, CSS3.
- Extensive experience working on Javascript
Experience: 2 to 7 years
Job Location- Pune
Experience – 4 to 7 Years
Notice Period - Immediate preferred
The Ideal Candidate-
This position is for UI Developers with hands-on experience in leading-edge technologies, looking to mark a niche in the software Industry
Essential Skills-
.
- Strong Command on Core Javascript, Core Java
- Strong Command on Angular JS and React JS
- Strong Knowledge of HTML5, CSS3
- Highly Preferred, experience in D3, Canvas API
- Ability to work on advanced javascript frameworks
If you are interested in an exciting role with learning and rewards, do apply.
Responsibilities:
• Build pixel-perfect, buttery smooth UIs across both mobile platforms.
• Leverage native APIs for deep integrations with both platforms.
• Diagnose and fix bugs and performance bottlenecks for performance that feels native.
• Reach out to the open source community to encourage and help implement mission-critical software fixes—React Native moves fast and often breaks things.
• Maintain code and write automated tests to ensure the product is of the highest quality.
• Transition existing React web apps to React Native.









