ReactJS Developer

Frontend developer with knowledge and experience in ReactJS, Jquery, Html, CSS.

Good Analytical thinking

Understand client requirements 

Good Know ledge of testing APIs for integration.

Experience in Redux and React

Certa (getcerta.com) is a Silicon Valley-based tech product start-up that is automating the vendor, supplier, and other stakeholder onboarding processes (think background checks, agreements, and the works) for companies across industries and geographies. With multiple Fortune 500 and Fortune 1000 clients, at Certa's tech team, you will be working on stuff that is changing the way huge companies do business.

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.

About the Role

We are looking for a motivated Frontend Developer Intern who is passionate about building modern, scalable, and high-performance interfaces. You will work on production-grade applications built with Next.js, React, Tailwind CSS, and TypeScript, and collaborate directly with senior engineers to deliver high-quality UI components and user experiences.

This internship will give you hands-on exposure to real engineering workflows, version control, code reviews, and agile development.

Key Responsibilities

• Develop responsive and accessible UI components using Next.js, React, Tailwind CSS, HTML, and CSS.
• Work with TypeScript to ensure readable, safe, and maintainable code.
• Integrate APIs and handle client-side state management.
• Collaborate with backend and design teams to implement end-to-end features.
• Maintain component-level consistency, performance, and reusability.
• Write clean, modular code following best practices and coding standards.
• Contribute to improving UI/UX through thoughtful design and user-centric development.
• Work with MongoDB when required for basic CRUD operations or prototype integrations.

Required Skills

• Strong understanding of React.js fundamentals.
• Hands-on experience with Next.js (SSR, SSG, API routes).
• Solid knowledge of Tailwind CSS, HTML5, CSS3, and modern styling practices.
• Basic understanding of TypeScript.
• Familiarity with Git/GitHub workflows.
• Understanding of responsive design principles and accessibility.

Good to Have

• Certifications in Tailwind CSS, CSS, or Next.js (highly preferred).
• Knowledge of component libraries, animations, or design systems.
• Understanding of MongoDB basics.
• Exposure to UI/UX tools (Figma, Adobe XD) is a plus.

Eligibility

• Students currently pursuing a Bachelor's/Master's in Computer Science, Engineering, or a related field.
• Fresh graduates may also apply.
• Ability to dedicate full-time hours during the internship period.

What You Will Gain

• Mentorship from senior engineers and architects.
• Experience building production-grade frontends for modern SaaS/AI products.
• Opportunity to work in a fast-growing, innovation-driven environment.
• Strong portfolio additions through meaningful project contributions.

Work Mode

• Fully Remote
• Flexible working hours
• Merit-based growth and long-term opportunities

Type, Location

Mumbai, Maharashtra, India

Desired Experience

4+ years

Roles and Responsibilities :

Skills required :

• Strong knowledge of javascript programming, ReactJS, HTML5, CSS3, SASS, ES6 Strong knowledge of modern responsive design techniques
• Strong knowledge of stateless microservices (node/java/etc..), HTTPS/REST, JSON, Webpack/Grunt/Gulp
• Very good understanding and implementation experience of web application UI using OpenID Connect login/authentication
• Version Control – Git, CI/CD of UI projects(e.g. CircleCI, Travis CI, Jenkins), configuration and deployment of static UI assets

Must have skills :

• Must have at least 4 years of industry experience in white labeled Front End web application design & development
• Experience in Test Driven Development, Front End testing and performance optimization (e.g. Jest, unit testing, end-to-end testing)

About the Company:- Rejolut is one of the award-winning fastest-growing emerging tech companies which is working on leading technology like Blockchain, ML & AI, Complex mobile & web apps, IoT etc.

The ideal candidate will be responsible for developing highly scalable and secure code.

React Js Job Description

• Proficient in client & server-side JavaScript, HTML5, CSS3 and webpack
• Competent in building single page web applications using Node.js and React Js
• Redux for state management
• Universal rendering (Client-side rendering and Server-side rendering)
• Experience with cross-browser, cross-platform, and design constraints on the web
• Experience in developing automated unit and functional tests
• Experience in an agile development process
• Solid knowledge of algorithms and design patterns
• Have a passion for quality and writing clean, readable code that scales and performs well
• Good interpersonal communication skills
• 1+ years of software design and web application development

Benefits :

> Health Insurance

> Work from Home

> Fast growth and more visibility into the company

> Experience to work on the latest technology

> Competitive Learning Environment with supportive co-workers

> Employee friendly HR Policies

> Paid leaves up to certain limits

> Competitive salaries & Bonuses

> Liberal working atmosphere

> Get mentored by the best in the industry

Schedule:

Day Shift/Flexible working hours

Monday to Friday

Skills:- React.js, Javascript and Redux/Flux

JD for Below position-

Preferred Technical Expertise-

1. Expertise in front end web application development
2. Solid Understanding of Javascript, JQuery.
3. Experience in HTML, CSS and Bootstrap library is required.
4. Experience with Django Framework.
5. Experience with source code versioning tools such as GIT, Bitbucket etc.

Secondary Skills/Good to have Skills:

1. Experience in developing REST API is a plus.
2. Experience in Python Programming is a plus.
3. Experience in Pandas and Numpy Libraries is a plus.
4. Experience with SQL is a plus.
5. Experience with any cloud platform ( GCP is a plus )

• Ability to design the overall architecture of UI components of the web application.
• Maintain quality and ensure responsiveness of applications.
• Collaborate with the rest of the engineering team to design and launch new features.
• Maintain code integrity and organization.
• Experience working with graphic designers and converting designs to visual elements using JavaScript, HTML, and CSS.
• Understanding and implementation of security and data protection.
• Good problem-solving skills and willingness to learn new technology

Qualifications:-

• 2+ year track record of relevant work experience and a Computer Science or a related technical discipline is required
• Excellent knowledge of JavaScript
• Proficient experience in ReactJS.
• OOPS, Concept, and Data Structure like Queue, Stack, Tree, Linked List, etc.
• Good knowledge in working with REST APIs
• Knowledge of converting designs to working web pages using HTML and CSS.
• Experience in Architecture and delivery of web applications.
• Knowledge of code versioning tool – Git

Good to have:

• Experience in AngularJS
• Experience in server-side programming