Senior Frontend Developer

Position Title : Frontend / Chrome Extension Developer (React + TypeScript)

Experience : 3+ years

Location : Remote

Job Role Summary :

Build and ship production-ready Chrome extensions that inject UI into existing web apps. Own content scripts, DOM integration, performance, and accessibility (WCAG 2.1 AA).

Mandatory Skills :

React, TypeScript, Chrome Extensions (MV3), Content Scripts, DOM Injection, MutationObserver, TailwindCSS/CSS Modules, Accessibility (WCAG 2.1 AA).

Key Responsibilities :

• Develop Chrome extensions using React + TypeScript.
• Inject and manage UI components within third-party web app DOMs.
• Write and maintain content scripts; handle dynamic pages via MutationObserver.
• Implement clean, responsive styling with TailwindCSS or CSS Modules.
• Ensure accessibility (WCAG 2.1 AA), keyboard navigation, and ARIA semantics.
• Integrate with APIs, manage extension permissions, storage, and messaging.
• Optimize performance, handle edge cases across sites, and write basic tests.

Required Skills :

• Strong React + TypeScript in production.
• Chrome Extension architecture: manifest v3, content/background scripts, messaging, permissions.
• DOM manipulation and safe UI injection strategies.
• MutationObserver, event delegation, handling SPA route changes.
• TailwindCSS or CSS Modules; solid CSS fundamentals.
• Accessibility (WCAG 2.1 AA) and cross-browser compatibility (Chromium/Firefox optional).
• Familiarity with build tooling (Vite/Webpack), linting, and Git.

Nice-to-Have :

• Experience with service workers, storage (sync/local), and i18n.
• Testing with Jest/RTL/Playwright.
• Security basics for extensions (CSP, sandboxing).

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.]

• You must know the in and out of JavaScript to design optimized and modular components that need to be used across our platform.
• You must be well versed in the React/Redux framework.
• Strong understanding of semantic HTML/HTML5, CSS/CSS3
• Experience in setting up the full UI workflow layer right from Development, Testing, Building, and Deployment.
• Good understanding of MVC architecture.

• Experience in frameworks like Bootstrap, Foundation, and CSS pre-processors like SASS and LESS.
• Exposure to page speed improvement techniques.
• Exposure of building responsive websites at scale.
• Prior work experience in Angular, Backbone, React

• Reach at 91 084 76999

We at https://www.linkedin.com/company/shethink-pvt-ltd/">SHETHINK Pvt. Ltd. are looking for experienced candidates as React.js web developers.
Are You The One?

Join the best, to be the best…

Role and Responsibilities:

• The candidate must be keenly expert in JavaScript (ES6), React JS (Functional React- React with Hooks).
• Must be well aware of the JS concepts like promises, async-await, callback, fetch, and array methods like map, filter, reduce. 
• We are highly fetching for the candidates that are good with conditional rendering, and very much clear regarding the concepts of useEffect hook.
• Knowledge of GIT is a must.
• Knowledge and experience in any state management library such as redux or context is a plus.
• Must be familiar with JS libraries like Axios, and UI libraries like material-ui, core-ui, formik, etc.
• Must have a proper understanding of CSS properties like margin, padding, flex, position, z-index, media queries, and other important concepts like media queries, DOM manipulation.
• Must be aware of using dev tools provided in the browsers such inspect elements and network tab to track API calls.
• Basic API calling through postman or similar tools.
• Candidate worked on projects dealing with manipulation of dates, form validations, etc. are preferred.

Experience Required:

• The candidate must at least have a total experience of 1-3 years in the relevant field. 
• The candidate must have basic knowledge regarding data structure and algorithm. 
• We require people with keen logistics skills.
• The candidate must be strong with basics and their concepts must be clear enough to deal with all sorts of delusions. 

Location:

• The job role of a React.js developer is open only for candidates residing in Indore or who are willing to relocate to Indore. 

We are highly fetching for immediate joiners or candidates that may join the company within 15 days. 

Desired Skills: React.js, JavaScript, Redux, RESTful APIs, TypeScript

Job Summary:

• 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
• 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 JWT Web Token
• Familiarity with modern front-end build pipelines and tools
• Experience with common front-end development tools such as Babel, Webpack, NPM, etc.
• Ability to understand business requirements and translate them into technical requirements
• A knack for benchmarking and optimization
• Familiarity with code versioning tools (such as Git, SVN, and Mercurial)
• Familiarity with any ReactJS testing framework is plus

Long Term Contract Job

Senior Frontend Developer 

About us

We are founded in 2007. Our mission is to develop a diverse portfolio of technologies, products, and services,that gives all people equal access to unbiased data and information. We believe that through this access people can empower and protect themselves in today’s
ever-changing world, filled with fake news, deception, and a lack of transparency.

About the Job

We are looking for a Sr. Front End Developer to join our growing team. Your
experience here will give you the opportunity to improve the fundamentals and learn about the
top notch technologies in front end development. If you are someone who is passionate about
building stellar user experiences and great products through elegant code this would be the job for you. You will play a key role in translating our customers and company needs into appealing and functional web pages while proving your ideas with testing.

What You Will Get to Do

1. Work with your team to improve our conversion rates by coding out variations for A/B testing
2. Build better user experiences
3. Rigorously educate yourself with the latest development techniques and best practices
4. Proactively anticipate issues and develop solutions
5. Clearly communicate solutions to team members both verbally and in written documentation
6. Implement new digital technologies or development techniques that help to meetbusiness objectives
7. Look at existing practices and use your experience to help build better practices when necessary
8. Work with our tech leads to decide what long term initiatives we should take on and then motivate others to embrace these initiative

1. 4+ years of front-end development experience
2. Experience with responsive web design and the ability to deliver outstanding functionality to the range of client devices from desktops and laptops to mobile platforms
3.  Familiarity with at least one JavaScript framework (MVW) and know when to do without one when necessary
4. Understanding of HTTP and how clients interact with a web server
5. Solid understanding of best practices. You read the YDKJS books.
6. Capable of coding in ES5 and ES6 and understand the difference between them
7. Up-to-date on HTML5 and CSS3 features
8. Passionate about supporting all browsers, including IE11+
9. Practical experience in design techniques for web UI applications
10. Demonstrated ability to roll up sleeves to develop and implement new features and functionality
11.  Possess an excellent understanding of creative tools in order to develop leading-edge web pages with interesting and innovative client-side capabilities
12.  Be independently driven and resourceful to deliver results with minimal direction
13. Have an entrepreneurial spirit with a drive to contribute new ideas for future development
14. Have the ability to deliver what is required but at the same time, look at code objectively to see areas of improvement
15. Have the ability to work with UX and technical teams to get things done
16. Have the ability to handle multiple, competing priorities in a fast-paced environment
17. Have excellent verbal and written communication skills

1. Experience working in an agile development environment
2. Experience with running experiments
3. Experience in trying out modern frameworks and executing on migration plan

1. You know how to polyfill features that aren't cross browser friendly.
2. You understand same-origin policy and cross-origin resource sharing.
3. You understand prototypal inheritance vs classical inheritance.

Job Summary
. Developing the latest user-facing features using React.js
· Designing a modern highly responsive web-based user interface
· Building reusable components and front-end libraries for future use
· Translating designs and wireframes into high-quality code
· Learn and understand user interactions
· Optimizing components for maximum performance across a vast array of web-capable devices and browsers
· Coordinating with various teams working on distinct layers
· As a React.js Developer, you will be involved from conception to completion with projects that are technologically sound and aesthetically impressive.

Technical skills:
· Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model
· Thorough understanding of React.js and its core principles
· Ability to create a reusable stateful component using React hooks
· Prior experience with popular React.js workflows (such as Flux or Redux)
· Familiarity with more current specifications of EcmaScript
· Prior experience with data structure libraries (e.g., Immutable.js)
· Knowledge of isomorphic React is a plus
· Familiarity with RESTful APIs
· Familiarity with HTML / CSS
· GIT experience is a plus
· 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.
· Familiarity with working with the siren-JSON schema for generating forms.
· Familiarity with react-hook-form
· Ability to understand business requirements and translate them into technical requirements
· A knack for benchmarking and optimization
· Familiarity with code versioning tools
· jest and enzyme for red-green tdd
· understanding of feature flag
· lint and husky hooks