React.js Developer

Senior React Developer – Trading & Fintech (Broker-Focused Solutions)

About Us:

At Tradelab Technologies Pvt Ltd, we don’t just build web applications, we create high-performance trading platforms tailored for brokers and financial institutions. Our platforms power real-time market analysis, ultra-low-latency trade execution, and seamless broker-client interactions.

What We Expect:

• 2+ years of front-end development experience, with 2+ years specializing in React.js.
• Deep expertise in React, Next.js, TypeScript, and state management libraries (Redux, Recoil, Zustand, etc.).
• Proven experience in building and optimizing ultra-responsive, high-performance trading platforms for brokers.
• Strong understanding of financial data visualization, real-time charting, order book mechanics, and trade execution workflows.
• Hands-on experience with real-time data streaming, WebSockets, FIX protocol, and API integrations for brokerage services.
• In-depth knowledge of performance optimization, server-side rendering, and rendering strategies for trading dashboards.
• Security-conscious mindset—you know how to build secure, compliant fintech applications that handle sensitive brokerage and trading data.
• A problem-solving mentality that thrives under pressure—brokers depend on our platforms for seamless trade execution, and we deliver nothing less than perfection.

What You Will Do:

• Lead the front-end development of trading applications designed specifically for brokers and financial institutions.
• Architect and optimize blazing-fast, low-latency web applications that ensure brokers can execute trades with unmatched speed and accuracy.
• Design and implement high-performance data visualization components—live stock charts, trade analytics, real-time market depth, and complex order books.
• Work closely with brokers, backend engineers, and UX designers to craft seamless, intuitive, and highly secure trading solutions.
• Solve hard problems at scale—whether it’s optimizing execution speeds, handling high-frequency WebSocket updates, or ensuring zero downtime during peak trading hours.
• Innovate and experiment with cutting-edge front-end technologies to push the boundaries of brokerage solutions.
• Own your work end-to-end—from concept to deployment, ensuring traders and brokers get a flawless user experience.

Must-Have Skills:

• Proven expertise in Front-end development with React.Js
• Deep expertise in React, Next.js, TypeScript, and state management libraries (Redux, Recoil, Zustand, etc.).
• Proven experience in building and optimizing ultra-responsive, high-performance trading platforms for brokers.
• Strong understanding of financial data visualization, real-time charting, order book mechanics, and trade execution workflows.
• Hands-on experience with real-time data streaming, WebSockets, FIX protocol, and API integrations for brokerage services.

Nice-to-Have Skills:

• Experience working on brokerage trading platforms, order management systems (OMS), or risk management tools.
• Contributions to open-source React trading libraries or a portfolio of real-time financial applications.
• Knowledge of regulatory compliance, order execution policies, and broker risk management tools.
• A track record of leading front-end teams, mentoring developers, and driving architectural decisions.

Why Join Us?

• Work with elite engineers and brokerage professionals in the fast-moving world of trading technology.
• Build platforms that brokers, traders, and financial institutions depend on daily.
• A culture that values bold innovation, real-time execution, and pushing the limits of brokerage tech.
• Expect challenges, high expectations, and a relentless pursuit of performance and precision.
• Competitive compensation, performance-driven growth, and a real opportunity to lead and shape the future of trading web applications for brokers.

If you’re obsessed with performance, thrive under market pressure, and are driven by results, we want you on our team. This is your chance to solve some of the toughest front-end challenges in brokerage and fintech. Step up. Apply now.

At Lemon Yellow, great design deserves great engineering.

We bring the design, you bring the tech magic, and together we create UI and UX experiences that make users smile.

We are looking for a Frontend Developer who can translate thoughtful design into smooth, scalable, and delightful digital experiences.

1. Core Responsibilities

Work closely with the design team to translate UI and UX requirements into high quality, functional interfaces.

Convert wireframes and mockups into fully interactive, iterative environments.

Build responsive, elegant, and accessible web interfaces using modern JavaScript practices.

Integrate frontend components with backend APIs and work collaboratively with backend engineers.

Ensure layouts are pixel perfect across devices, browsers, and screen sizes.

Write clean, reusable, and maintainable code while working with designers, strategists, and developers.

Contribute to shaping digital products, features, and enhancements.

2. Interaction and Motion

Use GSAP or similar tools to create smooth animations and micro-interactions.

Ensure motion enhances user experience without affecting performance.

Implement accessible interactions that feel natural and intuitive.

3. API and Integration Management

Integrate frontend systems with RESTful APIs and backend services.

Work with third party tools, plugins, and services as required.

Ensure smooth data flow, secure handling, and efficient UI rendering.

4. Code Quality and Optimization

Debug and optimize interfaces for speed, performance, and reliability.

Maintain best practices around component reuse and code organization.

Participate in code reviews and contribute to improving internal standards.

Ensure cross browser compatibility and responsive breakpoints.

5. Agile Collaboration

Participate in daily stand ups, sprint planning, retros, and reviews.

Contribute to task estimations and collaborate on technical problem solving.

Stay responsive to project shifts, timelines, and delivery cycles.

6. Continuous Learning and Innovation

Stay updated with the latest trends, tools, and practices in the frontend ecosystem.

Experiment with new frameworks, libraries, and methodologies.

Share learnings with the team and suggest creative, efficient solutions.

Requirements

• Bachelor’s degree in Engineering, Computer Science, or a related field.
• Minimum 1 year of hands-on frontend development experience.
• Strong proficiency in HTML, SASS CSS, and JavaScript ES6.
• Expertise in React.js.
• Familiarity with Bootstrap and Tailwind CSS.
• Experience with GSAP for animations.
• Knowledge of WordPress or WebFlow is a plus.
• Hands on experience with GIT and version control workflows.
• Ability to build responsive, user friendly layouts.
• Strong analytical and problem solving skills.
• Attention to detail and love for clean, maintainable code.
• Good collaboration and communication skills.
• Eagerness to learn, experiment, and grow.

What are we offering?

Experience

A chance to work on meaningful brands and digital products across industries. Every project brings new learning and opportunities to strengthen your development skills. You grow and you help the team grow.

Exposure

If you believe in your work, we believe in you. You get to work directly with clients, understand real world problems, and build solutions that create impact.

Empathy

A thoughtfully nurtured culture that values fun and fulfilment.

Your wellbeing, personal, professional, mental, and physical, becomes our priority.

From Fitness Thursdays to learning sessions, we make sure you laugh, learn, and feel supported.

Who are we?

Lemon Yellow LLP is a user centered UI and UX design agency based out of Thane, Maharashtra. With global experience, strong mentorship, and a passionate team, we aim to design digital happiness.

You should apply if you believe in building experiences that people enjoy using.

How do you reach us?

Well, after you send in your application, it takes us 2-3 weeks to review it. Sometimes, not often, we might delay just a bit beyond that. This happens when our mailbox is flooded with applications.

We promise we won’t ghost you, you’ll definitely hear from us. In the meantime, feel free to explore our official website. 

Responsibilities:

• Design, develop, and maintain web applications using Java and React JS.

• Collaborate with cross-functional teams to define, design, and ship new features.

• Ensure the performance, quality, and responsiveness of applications.

• Identify and correct bottlenecks and fix bugs.

• Maintain code integrity and organization.

• Develop new user-facing features using React JS.

• Build reusable components and front-end libraries for future use.

• Translate designs and wireframes into high-quality code.

• Optimize components for maximum performance across a vast array of web-capable devices and browsers.

• Participate in team meetings and discussions to understand user needs and functionalities.

• Perform code reviews and improve and maintain code quality.

• Work closely with product management and back-end developers to integrate user-facing elements with server-side logic.

• Keep up-to-date with the latest industry trends and technologies to ensure applications are current and competitive.

Requirements:

• Bachelor’s degree in Computer Science, Information Technology, or a related field.

• Proven experience as a Full Stack Developer or similar role.

• Strong proficiency in Java and React JS.

• In-depth knowledge of JavaScript, CSS, HTML, and front-end languages.

• Experience with React JS workflows such as Redux, Flux, and Webpack.

• Familiarity with RESTful APIs and web services.

• Knowledge of performance testing frameworks including Mocha and Jest.

• Excellent troubleshooting skills.

• Good project management skills.

• Strong communication and teamwork abilities.

Preferred Qualifications:

• Experience with cloud services such as AWS or Azure.

• Familiarity with CI/CD pipelines and DevOps practices.

• Knowledge of database management systems like MySQL, PostgreSQL, or MongoDB.

1.     Significant experience of working in front-end web development
2.     Extensive programming experience in HTML5, CSS3, SASS or LESS, and Bootstrap, Foundation or Materialize
3.     Angular Material, Chart Libraries(D3, Leaflet, Amchart etc).
4.     Solid understanding and development experience in Angular
5.     Experience with Typescript
6.     Experience with tools like Redux, Webpack, Angular CLI and/or Gulp
7.     Experience consuming REST APIs

Senior Software Engineer, Frontend

https://www.alivecor.com/">AliveCor, the pioneer of the smartphone EKG, with millions of EKGs from a large and growing user base, seeks a Senior Software Engineer (Front-end Applications) to contribute to the Applications team. You will be an integral member of our engineering team, responsible for developing industry-leading web applications that transform the healthcare industry and affect the way consumers use, engage, and act on their health data.

• Passionate about User Experience.
• Has great verbal and written communication skills to engage directly with your peers.
• Understands and is thoughtful about engineering trade-offs
• Experience building web applications with cross-browser support and RESTful API integrations
• Commitment to delivering results.
• Passionate about continuous improvement.

• B.E in Computer Science or a related discipline, or related practical experience.
• 5-8 years of Frontend development experience with at least 2 years working as a React.js Developer.
• A strong grasp of software engineering and web application development fundamentals, including JavaScript (ES5, ES6), HTML and CSS.
• Aptitude to learn new technologies (e.g. ES.Next).
• Excellent troubleshooting skills.
• Familiarity with RESTful APIs to connect the Front-end applications to backend service
• Bonus points for:
• Publicly available web applications, portfolios, or examples available on a source repository (e.g. GitHub, GitLab, Bitbucket)
• An interest in data visualizations using JavaScript libraries such as D3, Highcharts, and others
• Experience managing front end tooling (e.g. gulp, grunt, webpack, post-CSS, service workers)
• Experience with performance analysis and tuning of web application
• Experience developing back end server APIs and/or server-side rendering

AliveCor is on a mission to define modern healthcare through data, design and disruption. We’ve pioneered the creation of FDA-cleared machine-learning techniques, transformed wearable medtech to put proactive heart care at everyone’s fingertips. Kardia is the most clinically validated mobile EKG technology. AliveCor was named as one of the Top 10 Most Innovative Companies in Health for 2017 by Fast Company as part of the publication’s annual ranking of the world’s Most Innovative Companies. AliveCor was awarded the 2015 Tech Pioneer by the World Economic Forum and one of the 50 Smartest Companies in 2015 by the MIT Technology Review. AliveCor recently announced a collaboration with Mayo Clinic that will result in new machine learning capabilities to unlock previously hidden health indicators in EKG data, potentially improving heart health as well as overall health care for a variety of conditions. AliveCor is a privately held company headquartered in Mountain View, CA.

AliveCor is an equal opportunity employer and will not discriminate against any employee or applicant on the basis of age, colour, disability, gender, national origin, race, religion, sexual orientation, or any other classification protected by federal, state, or local law.

Watch the following video demonstrating our product.

https://www.youtube.com/watch?v=8I9xosgA-Ig">KardiaMobile: How's your heart?
https://www.youtube.com/watch?v=8I9xosgA-Ig