React.js Developer

Job Title : Lead Web Developer / Frontend Engineer

Experience Required : 10+ Years

Location : Bangalore (Hybrid – 3 Days Work From Office)

Work Timings : 11:00 AM to 8:00 PM IST

Notice Period : Immediate or Up to 30 Days (Preferred)

Work Mode : Hybrid

Interview Mode : Face-to-Face mandatory (for Round 2)

Role Overview :

We are hiring a Lead Frontend Engineer with 10+ Years of experience to drive the development of scalable, modern, and high-performance web applications.

This is a hands-on technical leadership role focused on React.js, micro-frontends, and Backend for Frontend (BFF) architecture, requiring both coding expertise and team leadership skills.

Mandatory Skills :

React.js, JavaScript/TypeScript, HTML, CSS, micro-frontend architecture, Backend for Frontend (BFF), Webpack, Jenkins (CI/CD), GCP, RDBMS/SQL, Git, and team leadership.

Core Responsibilities :

• Design and develop cloud-based web applications using React.js, HTML, CSS.
• Collaborate with UX/UI designers and backend engineers to implement seamless user experiences.
• Lead and mentor a team of frontend developers.
• Write clean, well-documented, scalable code using modern JavaScript/TypeScript practices.
• Implement CI/CD pipelines using Jenkins, deploy applications to CDNs.
• Integrate with GCP services, optimize front-end performance.
• Stay updated with modern frontend technologies and design patterns.
• Use Git for version control and collaborative workflows.
• Implement JavaScript libraries for web analytics and performance monitoring.

Key Requirements :

• 10+ Years of experience as a frontend/web developer.
• Strong proficiency in React.js, JavaScript/TypeScript, HTML, CSS.
• Experience with micro-frontend architecture and Backend for Frontend (BFF) patterns.
• Proficiency in frontend design frameworks and libraries (jQuery, Node.js).
• Strong understanding of build tools like Webpack, CI/CD using Jenkins.
• Experience with GCP and deploying to CDNs.
• Solid experience in RDBMS, SQL.
• Familiarity with Git and agile development practices.
• Excellent debugging, problem-solving, and communication skills.
• Bachelor’s/Master’s in Computer Science or a related field.

Nice to Have :

• Experience with Node.js.
• Previous experience working with web analytics frameworks.
• Exposure to JavaScript observability tools.

Interview Process :

1. Round 1 : Online Technical Interview (via Geektrust – 1 Hour)

2. Round 2 : Face-to-Face Interview with the Indian team in Bangalore (3 Hours – Mandatory)

3. Round 3 : Online Interview with CEO (30 Minutes)

Important Notes :

• Face-to-face interview in Bangalore is mandatory for Round 2.
• Preference given to candidates currently in Bangalore or willing to travel for interviews.
• Remote applicants who cannot attend the in-person round will not be considered.

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 and 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.

Job Title: Associate Frontend Engineer

Job Summary:

We are looking for a passionate and motivated Associate Frontend Engineer with 1 to 2 years of experience to join our product engineering team. In this role, you will work closely with experienced developers and designers to build seamless, performant, and user-friendly interfaces using modern JavaScript frameworks. You’ll gain hands-on experience in building production-ready web applications and learn how to deliver high-quality UI at scale.

This opportunity is ideal for individuals who are early in their careers and eager to grow through real-world development, mentorship, and continuous learning.

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

Key Responsibilities:

• Assist in developing and maintaining responsive, accessible, and performant web user interfaces.
• Work with modern JavaScript frameworks/libraries such as React, Vue, or Angular to build modular, reusable components.
• Translate UI/UX designs from tools like Figma into pixel-perfect, production-quality code.
• Write clean, maintainable, and well-documented HTML, CSS, and JavaScript (ES6+).
• Collaborate with product managers, backend engineers, and designers to deliver complete, integrated features.
• Learn and apply best practices in state management, component-driven development, and API integration.
• Participate in code reviews, understand and follow design systems, and contribute to a culture of code quality.
• Debug and resolve cross-browser, cross-device, and performance-related UI issues.
• Use tools such as Git, CI/CD pipelines, and frontend build tools (e.g., Webpack, Vite) as part of your daily workflow.
• Begin working with TypeScript, Tailwind CSS, and popular UI libraries (e.g., Material UI, Bootstrap) to enhance development efficiency and consistency.
• Follow accessibility guidelines and responsive design principles, ensuring your UI works for all users.
• Gain exposure to linting tools, formatters, testing libraries (unit/integration/e2e), and performance profiling using browser dev tools.

Requirements:

• 1 to 2 years of experience in frontend development through internships, academic projects, freelance work, or personal side projects.
• Solid understanding of HTML, CSS, and JavaScript (ES6+) fundamentals.
• Familiarity with at least one modern JavaScript framework (React, Vue, Angular).
• Understanding of version control systems like Git and ability to collaborate in a team-oriented development workflow.
• Willingness to learn and apply best practices in UI performance, security, accessibility, and maintainability.
• Strong problem-solving abilities, attention to detail, and eagerness to grow through mentorship and feedback.
• Effective communication skills and ability to work in a fast-paced, agile team environment.

Qualifications:

Primary Skill Set:

5+ years for experience in developing highly scalable, reliable, secure web applications
Experience with React.js, Node.js, Redux, flux, Javascript (preferably TypeScript).
Atleast 1 years of experience in product or SaaS development.
Excellent Team management, communication skills, both verbal and written
Strong CS fundamentals like data structures and especially the asynchronous challenges that are faced by JavaScript developers regularily.


Preferable Skillset:

One year of experience using AWS services, such as Lambda, SES, SQS, EC2, RDS, ELB’s and have knowledge of VPC’s (AWS and/or RightScale knowledge a plus.
Proficient with the Webpack,Jest, Eslint, Jenkins, Docker, Enzyme.
Experience designing data persistence and caching concepts using both SQL and NoSQL DBMS (MySQL, DynamoDB, Redis, etc.) and client side storage
Profile and improve frontend performance

We are looking for a skilled react.js developer to join our front-end development team. In this role, you will be responsible for developing and implementing user interface components using React.js concepts. You will also be responsible for profiling and improving front-end performance and documenting our front-end codebase.

React.js Developer Responsibilities: 

1.     Reviewing application requirements and interface designs.
2.     Identifying web-based user interactions.
3.     Developing and implementing highly responsive user interface components using react concepts.
4.     Writing application interface codes using JavaScript following react.js workflows.
5.     Troubleshooting interface software and debugging application codes.
6.     Developing and implementing front-end architecture to support user interface concepts.
7.     Monitoring and improving front-end performance.
8.     Documenting application changes and developing updates. 

React.js Developer Requirements: 

1.     Previous experience working as a react.js developer.
2.     In-depth knowledge of JavaScript, CSS, HTML, and front-end languages.
3.     Knowledge of REACT tools including React.js, Webpack, Enzyme, Redux, and Flux.
4.     Experience with user interface design.
5.     Experience with browser-based debugging and performance testing software.
6.     Excellent troubleshooting skills.

Description of Skills/abilities:

We are looking for a great JavaScript developer who is proficient with React.js. Your primary focus will be on developing user interface components and implementing those with well-known React.js workflows such as Redux. You will ensure that these components and the overall application are robust and easy to maintain. You will coordinate with the rest of the team working on different layers of the infrastructure. Therefore, a commitment to collaborative problem solving, sophisticated design, and quality product is a must.

You will be responsible for architecting and building the applications, as well as coordinating with the teams responsible for other layers of the product infrastructure. Building a product is a highly collaborative effort, and as such, a strong team player with a commitment to perfection is required.

Responsibilities

1. Developing new user-facing features using React.js, React hooks.
2. Building reusable components and front-end libraries for future use.
3. Translating designs and wireframes into high quality code.
4. Optimizing components for maximum performance across a vast array of web-capable devices and all browsers.
5. Build pixel-perfect, buttery smooth UIs across all web browsers.
6. Diagnose, fix bugs, maintain code and write automated tests to ensure the product is of the highest quality.
7. Key understanding about Object Oriented Programming, Web Architecture, SDLC, Rest Framework.
8. Should have understanding in Hybrid App Ecosystem, Code Once - Deploy Anywhere thought process.
9. Responsible for development of new highly-responsive, web-based user interface.
10. Construct visualizations that are able to depict vast amounts of data.
11. Work with product team and graphic designers.
12. Develop a flexible and well-structured front-end architecture, along with the APIs to support it React.js developer requirements and qualifications.
13. Support the entire application lifecycle (concept, design, test, release and support). Produce fully functional web, mobile applications writing clean code.

Skills

1. Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model.
2. Thorough understanding of React.js and its core principles.
3. Having Experience with popular React.js workflows such as Redux.
4. Familiarity with newer specifications of Typescript.
5. Having Experience with data structure libraries (e.g., Immutable.js).
6. Knowledge of isomorphic React is a plus.
7. Familiarity with RESTful APIs.
8. Knowledge of modern authorization mechanisms, such as JSON Web Token.
9. Familiarity with modern front-end build pipelines and tools.
10. Experience with common front-end development tools such as Babel, Webpack, NPM, etc.
11. Familiarity with code versioning tools such as Git, SVN.
12. Knowledge of functional or object-oriented programming.
13. Ability to write well-documented, clean typescript code.
14. Rock solid at working with third-party dependencies and debugging dependency conflicts.
15. Understanding of REST APIs, the document request model, and offline storage.

Skill Set:

React, React Hooks, Redux, and Typescript with minimum of 6+ Years of relevant Experience.

Requirements:

• 10+ years of software development experience in java.
• Knowledge of multiple front-end languages and libraries (e. g. HTML/ CSS, JavaScript/Typescript, XML, jQuery)
• Familiarity with RESTful APIs.
• Experience with Micro Services based architecture
• Experience with Angular 5 Angular 8 and/or experience with React JS
• Strong debugging/troubleshooting skills.
• Good understanding of SDLC, Agile methodologies
• Proven experience as a Full Stack Developer.
• Experience developing desktop and mobile applications
• Familiarity with common stacks Knowledge of multiple back-end languages (e. g. C#, Java, Python) and JavaScript frameworks (e. g. Angular, React, Node.js )Familiarity with Docker and Kubernetes
• Familiarity with databases (e. g. MySQL, PostgreSQL), web servers (e. g. Tomcat, Apache).
• Excellent communication and ability to lead a 5-10 member team

Responsibilities:

• Responsible for the entire development process for the Internal IP (e.g. Quality Fusion)
• Work with development teams and product managers to ideate software solutions
• Analyzing user requirements, envisioning system features and functionality.
• Design, build, and maintain efficient, reusable, and reliable codes by setting expectations and features priorities throughout the development life cycle.
• Working with Senior leadership and stakeholders to present ideas and solutions
• Design client-side and server-side architecture
• Build the front-end of applications through appealing visual design
• Develop and manage well-functioning databases and applications
• Write effective APIsTest software to ensure responsiveness and efficiency in troubleshooting, debug and upgrade software
• Create security and data protection settings.

Skills Required:

• Deep understanding of React.js and its fundamentals, ideally including modern features like hooks
• Excellent understanding of TypeScript/Javascript including the OOP concept and how shadow DOM and DOM work
• Experience with widely used React.js state managers like Flux/Redux
• Knowledge of RESTful APIs
• Familiarity with modern front-end build pipelines and tools like Webpack, Babel, NPM etc
• Knowledge of the overall browser rendering behaviour and measuring and optimising performance
• Strong hands-on experience with source code management systems like Git

• Design and implementation of the frontend applications and Mobile apps
• “Pixel-perfect” implementation of our approved user interface
• Ability to understand business requirements and translate them into technical requirements
• Break features into simpler granular tasks, estimate effort required, and identify dependencies
• Work with Analyst and back end developers to deliver a seamless user experience
• Write clean, efficient, maintainable code with good test coverage
• Build reusable code and libraries for future use and optimize the application for maximum speed and scalability
• Test and Debug as required

Expected Qualifications and Key Skills

• BSc or B.E in Computer Science / Engineering from a tier-1 college in India or abroad
• Proficiency in JavaScript, including DOM manipulation and the JavaScript object model
• Strong understanding of UI/UX, responsive design, cross-browser compatibility, AJAX, and general web standards
• Thorough understanding of React.js and its core principles
• Experience with popular React.js workflows (such as Flux or Redux)
• Familiarity with newer specifications of EcmaScript/TypeScript
• Experience with data structure libraries (e.g., Immutable.js)
• Knowledge of isomorphic React is a plus
• Familiarity with RESTful APIs
• Knowledge of modern authorization mechanisms, such as JSON Web Token
• Familiarity with modern front-end build pipelines and tools
• Experience with common front-end development tools such as Babel, Webpack, NPM, etc.
• Proficiency with Git / Version control