React Js Developer

Job TItile : Senior Software Engineer – Frontend (React.js)

Location : Bengaluru (Hybrid – 3 Days WFO)

Working Hours : 11:00 AM - 8:00 PM

Experience : 6 to 9 Years

Notice Period : Preferably 30 Days

About the Role :

We are looking for an experienced and Dynamic Senior Frontend Developer to join our growing team. If you are passionate about building cloud-based web applications with cutting-edge technologies, and you excel in React.js, HTML, CSS, and JavaScript, we want to hear from you. As a key contributor, you’ll collaborate with talented UX/UI designers to create innovative, high-quality user experiences.

What You’ll Do :

• Develop and Deliver : Build robust, scalable cloud-based web applications using React.js, HTML, CSS, and JavaScript.
• Collaborate with Designers : Partner with UX designers to transform ideas into intuitive, visually stunning user interfaces.
• Write Quality Code : Ensure code quality through writing clean, maintainable, and efficient code.
• Optimize Performance : Focus on performance optimization and troubleshooting to provide the best user experience.
• Work in Agile Environment : Engage in agile development cycles with a strong focus on iterative improvement.
• Code Review and Mentorship : Participate in code reviews, offer constructive feedback, and mentor junior developers to elevate the team's overall capabilities.

What We Are Looking For :

Core Skills :

React.js : Extensive hands-on experience in building responsive web applications with React.

Frontend Technologies : Expertise in HTML, CSS, JavaScript, and TypeScript.

Version Control : Familiarity with Git for source code management and collaboration.

Problem-Solving : Strong debugging and problem-solving skills with keen attention to detail.

Collaboration : Ability to work both independently and as part of a collaborative team.

Preferred Skills :

Node.js : Experience with Node.js or backend technologies is a plus.

UX/UI Design : Knowledge of design principles and experience collaborating with designers to create seamless user experiences.

Qualifications :

Bachelor’s or Master’s degree in Computer Science, Computer Engineering, or a related field.

Why Join Us?

Impactful Work : Work on exciting projects that shape the future of cloud-based web applications.

Collaborative Culture : Join a team of talented engineers and designers in a collaborative, creative, and supportive environment.

Career Growth : Opportunities for continuous learning, mentorship, and professional development.

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).

Who are we :

Trendlyne, an Series-A funded, profitable products startup in the financial markets space with cutting edge analytics products aimed at businesses in stock markets and mutual funds.

Our founders are IIT + IIM graduates, with strong tech, analytics and marketing experience. We have top finance and management experts on the Board of Directors.

What do we do :

We build powerful analytics products in the stock market space that are best in class. Organic growth in B2B and B2C products have already made the company profitable. We deliver 800 million+ APIs every month to B2B customers.

Trendlyne analytics deals with 100s of millions rows of data to generate insights, scores and visualisations which are an industry benchmark.

Technical Skills Required :

- Hands-on development experience on ReactJS, React Native

- Excellent front-end development skills - Javascript ES6, HTML5, CSS3, Bootstrap/Flex

- Excellent understanding of web browsers, mobile browsers and responsiveness

- Experience in UI Build using Webpack/ Gulp

- Proficient understanding of code versioning tools, such as Git, Bitbucket, Github

- Proficient understanding of the performance of web and mobile applications

- Knowledge of Django web framework or Python will be an added advantage

Responsibilities :

- Develop new user-facing features, web and mobile applications

- Use HTML, CSS, JS, to deliver front-end of projects on time

- Work with UI & UX designers and project managers to ensure timely delivery of code

- Work with Backend developers and ensure smooth integration with CMS or APIs

- Build reusable code and libraries for future use

- Ensure the technical feasibility of UI/UX designs

- Optimize website for maximum speed and scalability

- As part of the core team, you will be working on cutting edge technologies like Spark, Flume, online backtesting and data visualization, and machine learning.

- All Developers will be involved with the entire lifecycle of the product right from product conceptualization, design, implementation and mobile app and web delivery.

- Salary on par with the industry, with company equity.

We need a trained Website Developer.

Must have a experience of 3 to 5 years.

Knowledge of React, Nod JS, HTML CSS.

• Develop web-based application for analytics using Angular
• Integrate and extend Python REST APIs and create visually stunning UI experiences for analysts and users.
• Create flexible dashboards and reports (using plotly, d3, etc) and  leverage open source technology to create various components.
• Create a flexible UI for data analytics and big data usecases which can be used by Large Tier banks as well as smallscale agile startups
• Write unit tests and functional tests for the component using tools like Jasmine, Karma, Cypress, etc.
• Follow software development practices with continuous testing, development and integration (CD/CI)
• Write and maintain technical design documents and new-feature documents
• Collaborate closely with developers, engineers, testers, and product managers
• Participate in peer-based code reviews and design reviews
• Follow agile methodology and encourage collaboration with tools such as GIT, Confluence and Slack applications
• Undergraduate degree or above in computer science preferred

Required Qualifications

• Knows SPA and frontend technologies well
• Has used atleast 1 web framework: Angular / React / Vue / etc. and comfortable with Javascript/Typescript.
• Experience with styling (CSS / SCSS / others) frameworks like bootstrap, material, foundation, tailwind, etc. is a plus
• Knowledge on visualization frameworks like D3, plotly, highcharts, chart.js, etc. to make customizable dashboards.
• Has used testing libraries like karma, jest, jasmine, cypress, selenium, etc.
• Familiar with with frontend processes like State management (Redux), Reactive programming (rxjs), Authentication methods (JWT, SAML) etc. 
• Basic knowledge about APIs (flask, django, nodejs) and worked on deploying web applications (nginx or apache or cloud technologies like AWS, GCP, docker, etc.) will be beneficial.

What You’ll Do

• Should be able to develop an application with vanilla Javascript without any frameworks.
• Maintain reusable code and improve code quality.
• Optimize application for maximum speed.
• Should take ownership and work closely with other teams. such as back-end.
• Make suggestions for better solutions to problems and keep abreast of the latest and emerging technologies.
• Be comfortable working throughout the lifespan of a project.

Who you are

• Should have minimum 5+ years of experience.
• Proficient understanding of web markup, including HTML5, CSS3 and vanilla JavaScript.
• Should have good knowledge on ES6.
• Understanding of CSS pre-processing platforms, such as LESS and SASS.
• Should be proficient any of the the frameworks  ReactJs, VueJs etc.
• Should have knowledge on Node Js.
• Should have hands on experience web component development.
• Good understanding of Responsive Web Designing, CSS media queries and Bootstrap library.
• Understanding of cross-browser compatibility issues and ways to work around them.
• Good understanding of asynchronous/Ajax request handling.
• Good understanding of OOJS.
• Knowledge of code versioning tools, such as GIT.
• Knowledge in writing UI test cases using any test framework.

Education

• Bachelor's  degree in Computer Science, Engineering or equivalent demonstrable experience. 

Benefits

• In addition to competitive salaries and benefits packages, Nisum India offers its employees some unique and fun extras:
• Continuous Learning - Year-round training sessions are offered as part of skill enhancement certifications sponsored by the company on an as need basis. We support our team to excel in their field.
• Parental Medical Insurance - Nisum believes our team is the heart of our business and we want to make sure to take care of the heart of theirs. We offer opt-in parental medical insurance in addition to our medical benefits.
• Activities -From the Nisum Premier League's cricket tournaments to hosted Hack-a-thon, Nisum employees can participate in a variety of team building activities such as skits, dances performance in addition to festival celebrations.
• Free Meals - Free snacks and dinner is provided on a daily basis, in addition to subsidized lunch.