Frontend Developer - React, Javascript, GraphQl

Ideal Candidate

8+ years of experience in front-end development, with at least 3–5 years in technical/architectural leadership roles across web and mobile platforms.

Expert in React.js and React Native, with hands-on experience designing and building scalable, modular applications using modern front-end frameworks and reusable component libraries.

Strong geospatial capabilities—proven experience integrating and optimizing mapping solutions (e.g., Google Maps, HERE Maps) with features like routing, clustering, and overlays.

Mobile-first mindset, with deep knowledge of responsive UI design, performance optimization for low-bandwidth environments, and cross-platform compatibility.

Architectural expertise in modular design, micro-frontends, SSR/SSG, PWAs, and cross-platform solutions—ideally with experience in monorepo environments and BFF patterns.

Technical leadership skills, including mentoring developers, enforcing best practices, driving autonomous development, and aligning technical solutions with business needs.

CI/CD & DevOps familiarity—strong understanding of build tools (Webpack, Vite, Metro), containerization (Docker), and deployment automation using Jenkins, GitLab CI, etc.

Security, accessibility, and testing focus—capable of implementing WCAG-compliant UIs, secure data handling, and robust test strategies using tools like Jest, Cypress, Detox, and Appium

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.

At Loyalty Juggernaut, we’re on a mission to revolutionize customer loyalty through AI-driven SaaS solutions. We are THE JUGGERNAUTS, driving innovation and impact in the loyalty ecosystem with GRAVTY®, our SaaS Product that empowers multinational enterprises to build deeper customer connections. Designed for scalability and personalization, GRAVTY® delivers cutting-edge loyalty solutions that transform customer engagement across diverse industries including Airlines, Airport, Retail, Hospitality, Banking, F&B, Telecom, Insurance and Ecosystem.

With millions of global customers using GRAVTY® everyday, our powerful UI is what makes the first impression — and we’re looking for passionate UI Developers to help us make it exceptional. As a UI Developer, you will work on dynamic and innovative projects that focus on building visually stunning, responsive, and user-friendly web experiences and create exceptional user interfaces that power the next-gen loyalty solutions.

What you will own:

• Integration of front-end application with the application business layer
• Collecting feedback from design and technical staff on website development needs
• Understanding executing accessibility and progressive enhancement presentation
• Planning and estimating projects
• Contributing to the engineering team’s culture of high code quality
• Coordinating with Interface Design Architects for meeting accessibility standards at the code level
• Creating conceptual diagrams, and visual mock-ups, and manage detailed user interface specifications
• Conducting usability testing to resolve interface problems
• Ensuring design consistency with the client’s development standards and guidelines
• Designing and building UIs on any server platform in a team environment
• Guiding and maintaining developer teams and best practices

To be successful in this role, you should have :

• 1 to 4 years of relevant experience and expertise in building pixel-perfect, robust and performant enterprise web applications, preferably in a fast-paced environment
• Expertise on AngularJS, HTML and CSS, JavaScript
• Familiarity with AWS/GCP and MySQL is a plus
• Thorough understanding/experience in the Agile software development cycle
• Love for product design ,desire for innovation, high commitment and ownership for work and dedication for learning and sharing ideas
• Strong communication skills
• B.Tech in CS/IT from a Tier-1 campus with exceptional programming skills

Why choose us?

• This opportunity offers a dynamic and supportive work environment where you'll have the chance to not just collaborate with talented technocrats but also work with globally recognized brands, gain exposure, and carve your own career path
• You will get to innovate and dabble in the future of technology -Enterprise Cloud Computing, Machine Learning, AI, Mobile, and much more

Company Overview

VC-backed Fintech startup with an innovative online trading application seeking an experienced Frontend Engineer to join our growing team.

We're based out of UK and have our engineering team in India.

Job Description

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 them following well-known React.js workflows (such as Flux or 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 important.

Responsibilities

1. Developing new user-facing features using React.js
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 browsers
5. Maintain existing React systems, including fixing bugs
6. Handling backend infra written in Next/Node/Express

Skills

1. Strong proficiency in debugging, JavaScript, including DOM manipulation and the JavaScript object model
2. Thorough understanding of React.js and its core principles
3. Experience with popular React.js workflows (such as Flux or Redux)
4. Familiarity with newer specifications of EcmaScript
5. Experience with data structure libraries (e.g., Immutable.js)
6. Knowledge of isomorphic React is a plus
7. Knowledge of isomorphic Next js and Node js is a plus
8. Familiarity with RESTful APIs
9. Knowledge of modern authorization mechanisms, such as JSON Web Token
10. Familiarity with modern front-end build pipelines and tools
11. Experience with common front-end development tools such as Babel, Webpack, NPM, etc.
12. Familiarity with basic authentication mechanism and security
13. Ability to understand business requirements and translate them into technical requirements
14. A knack for benchmarking and optimization
15. Familiarity with code versioning tools such as Git

[Please note: Our HQ is in Wales and we're in the process of creating an Indian Entity. This means that the candidate will be responsible for all Tax related compliances until the entity is setup.]

• 5+ years in architecting and building Single Page Applications (SPA)
• Shipped at least 2+ applications using Angular/AngularJs
• 6+ years expertise in building Angularjs and Angular with integration and unit tests.
• Good working knowledge of other frameworks such as REACT, nodejs, meteor etc.
• Experience with package management tools such as webpack for minification, uglification etc
• Experience with creating embeddable widgets
• Expertise with CSS frameworks such as Bootstrap4

• Demonstrated expertise of building cloud native applications
• Familiarity with administration of CI/CD such as jenkins
• Responsibilities
• Develop new user-facing features
• Build reusable code and libraries for future use
• Collaborate with other team members and stakeholders to create UI/UX designs
• Ensure the technical feasibility of UI/UX designs
• Optimize application for maximum speed and scalability
• Collaborate with other team members and stakeholders

• AngularJS, Angular: 5 years (Required)
• Single Page Applications: 5 years (Required)
• CI/CD: 2 years (Preferred)
• webpack: 2 years (Preferred)
• CSS: 5 years (Preferred)
• Cloud Native: 2 years (Preferred)
• React, vuejs: 1 year (Preferred)

Job Description

We are looking for a qualified Front-end developer to join our IT team. You will be responsible for building the ‘client-side’ of our web applications. You should be able to translate our company and customer needs into functional and appealing interactive applications.

If you’re interested in creating a user-friendly environment by writing code and moving forward in your career, then this job is for you. We expect you to be a tech-savvy professional, who is curious about new digital technologies and aspires to combine usability with visual design.

Ultimately, you should be able to create a functional and attractive digital environment for our company, ensuring great user experience.

Key Responsibilities

• Use markup languages like HTML to create user-friendly web pages
• Maintain and improve website
• Optimize applications for maximum speed
• Design mobile-based features
• Collaborate with back-end developers and web designers to improve usability
• Get feedback from, and build solutions for, users and customers
• Write functional requirement documents and guides
• Create quality mockups and prototypes
• Help back-end developers with coding and troubleshooting
• Ensure high quality graphic standards and brand consistency
• Stay up-to-date on emerging technologies
• Create fast and functional and intuitive interfaces
• Follow coding standards, build appropriate unit tests, integrate tests and deployment scripts

• Translate designs and style guides provided by the UI/UX team into functional user interfaces, ensure cross-browser compatibility and performance

• Suggest improvements to user interface, software architecture or use of new technologies Deliver reliable solutions that handle massive data and high traffic.

Skills Required

• Hands on experience with markup languages
• Experience with JavaScript, CSS and jQuery
• Familiarity with browser testing and debugging
• In-depth understanding of the entire web development process (design, development and deployment)
• Understanding of layout aesthetics
• Knowledge of SEO principles
• Familiarity with software like Adobe Suite, Photoshop and content management systems
• An ability to perform well in a fast-paced environment
• Excellent analytical and multitasking skills
• BSc degree in Computer Science or relevant field
• Tech/ M.Tech in CS or other related fields such as EE or MCA from IIT/NIT/BITS but not compulsory.
• Good experience in JavaScript/ReactJS/Nodejs/HTML/jQuery/Css/SASS

• Experience in AngularJs/ Webpack/ Gulp will be a plus point but not mandatory Strong Javascript fundamentals along with experience with libraries.
• Well versed in software engineering principles, frameworks, and technologies

• Takes responsibility for successful delivery of the solutions Communicates continually with the project teams Explains progress on the development effort

• Self-directed team player who thrives in a continually changing environment A hands on and a passionate coder with minimalistic design sense

• Prior start up experience is preferred

We are looking for a React Native developer interested in building performant mobile apps on both the iOS and Android platforms. You will be responsible for architecting and building these 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
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.

Skills
Firm grasp of the JavaScript, TypeScript, ClojureScript language and its nuances, including ES6+ syntax Knowledge of functional or object-oriented programming
Ability to write well-documented, clean Javascript code
Rock-solid at working with third-party dependencies and debugging dependency conflicts
Familiarity with native build tools, like XCode, Gradle Android Studio, IntelliJ
Understanding of REST APIs, the document request model, and offline storage
Experience with automated testing suites, like Jest or Mocha

Required Skills:

• Experience with React JS and Redux.
  • A background in building JavaScript UI applications, with a strong understanding of UI frameworks and paradigms available including concepts like asynchronous programming, closures, types, and ES6.
  • HTML/CSS experience, including concepts like layout, specificity, cross-browser compatibility, and accessibility
  • Experience with browser APIs and optimizing front-end performance. Understand the full web technology stack, e.g. HTML, CSS, HTTP, cookies, headers, asset loading / caching.
  • Have a deep understanding of frontend application structure and architecture
  • Have great customer empathy and appreciate the User’s experience
  • Experience with unit testing, using test frameworks like Jest, Mocha, Enzyme etc.
  • Experience in Web Development end-to-end, from design to release.
  • Experience or aspiration to be a full stack developer(Node.js).