React Developer

We are seeking a highly skilled React JS Developer with exceptional DOM manipulation expertise and real-time data handling experience to join our team. You'll be building and optimizing high-performance user interfaces for stock market trading applications where milliseconds matter and data flows continuously.

The ideal candidate thrives in fast-paced environments, understands the intricacies of browser performance, and has hands-on experience with WebSockets and real-time data streaming architectures.

Key Responsibilities

Core Development

• Advanced DOM Operations: Implement complex, performance-optimized DOM manipulations for real-time trading interfaces
• Real-time Data Management: Build robust WebSocket connections and handle high-frequency data streams with minimal latency
• Performance Engineering: Create lightning-fast, scalable front-end applications that process thousands of market updates per second
• Custom Component Architecture: Design and build reusable, high-performance React components optimized for trading workflows

Collaboration & Integration

• Work closely with traders, quants, and backend developers to translate complex trading requirements into intuitive interfaces
• Collaborate with UX/UI designers and product managers to create responsive, trader-focused experiences
• Integrate with real-time market data APIs and trading execution systems

Technical Excellence

• Implement sophisticated data visualizations and interactive charts using libraries like Chartjs, TradingView, or custom D3.js solutions
• Ensure cross-browser compatibility and responsiveness across multiple devices and screen sizes
• Debug and resolve complex performance issues, particularly in real-time data processing and rendering
• Maintain high-quality code through reviews, testing, and comprehensive documentation

Required Skills & Experience

React & JavaScript Mastery

• 5+ years of professional React.js development with deep understanding of React internals, hooks, and advanced patterns
• Expert-level JavaScript (ES6+) with strong proficiency in asynchronous programming, closures, and memory management
• Advanced HTML5 & CSS3 skills with focus on performance and cross-browser compatibility

Real-time & Performance Expertise

• Proven experience with WebSockets and real-time data streaming protocols
• Strong DOM manipulation skills - direct DOM access, virtual scrolling, efficient updates, and performance optimization
• RESTful API integration with experience in handling high-frequency data feeds
• Browser performance optimization - understanding of rendering pipeline, memory management, and profiling tools

Development Tools & Practices

• Proficiency with modern build tools: Webpack, Babel, Vite, or similar
• Experience with Git version control and collaborative development workflows
• Agile/Scrum development environment experience
• Understanding of testing frameworks (Jest, React Testing Library)

Financial Data Visualization

• Experience with financial charting libraries: Chartjs, TradingView, D3.js, or custom visualization solutions
• Understanding of market data structures, order books, and trading terminology
• Knowledge of data streaming optimization techniques for financial applications

Nice-to-Have Skills

Domain Expertise

• Prior experience in stock market, trading, or financial services - understanding of trading workflows, order management, risk systems
• Algorithmic trading knowledge or exposure to quantitative trading systems
• Financial market understanding - equities, derivatives, commodities

Technical Plus Points

• Backend development experience with GoLang, Python, or Node.js
• Database knowledge: SQL, NoSQL, time-series databases (InfluxDB, TimescaleDB)
• Cloud platform experience: AWS, Azure, GCP for deploying scalable applications
• Message queue systems: Redis, RabbitMQ, Kafka, NATS for real-time data processing
• Microservices architecture understanding and API design principles

Advanced Skills

• Service Worker implementation for offline-first applications
• Progressive Web App (PWA) development
• Mobile-first responsive design expertise

Qualifications

• Bachelor's degree in Computer Science, Engineering, or related field (or equivalent professional experience)
• 5+ years of professional React.js development with demonstrable experience in performance-critical applications
• Portfolio or examples of complex real-time applications you've built
• Financial services experience strongly preferred

Why You'll Love Working Here

We're a team that hustles—plain and simple. But we also believe life outside work matters. No cubicles, no suits—just great people doing great work in a space built for comfort and creativity.

What We Offer

💰 Competitive salary – Get paid what you're worth

🌴 Generous paid time off – Recharge and come back sharper

🌍 Work with the best – Collaborate with top-tier global talent

✈️ Adventure together – Annual offsites (mostly outside India) and regular team outings

🎯 Performance rewards – Multiple bonuses for those who go above and beyond

🏥 Health covered – Comprehensive insurance so you're always protected

⚡ Fun, not just work – On-site sports, games, and a lively workspace

🧠 Learn and lead – Regular knowledge-sharing sessions led by your peers

📚 Annual Education Stipend – Take any external course, bootcamp, or certification that makes you better at your craft

🏋️ Stay fit – Gym memberships with equal employer contribution to keep you at your best

🚚 Relocation support – Smooth move? We've got your back

🏆 Friendly competition – Work challenges and extracurricular contests to keep things exciting

We work hard, play hard, and grow together. Join us.

Job Title: Lead Frontend Developer – React.JS

Experience Required: 10–14 Years

Location: Bengaluru (Hybrid – 3 Days WFO)

Work Hours: 11 AM – 8 PM

About the Role

We are seeking an experienced Lead Web App Developer – Frontend with a proven track record in building dynamic, user-friendly web applications. The ideal candidate will have expertise in React.js, HTML, and CSS, coupled with strong debugging and problem-solving skills. If you have a passion for crafting seamless user experiences and a collaborative mindset, we’d love to hear from you!

Key Responsibilities

• Frontend Development: Develop and maintain cloud-based web applications using React.js, HTML, and CSS.
• User-Centric Design: Collaborate closely with UX designers to transform prototypes into high-quality, responsive user interfaces.
• Code Excellence: Write clean, reusable, and efficient code using modern JavaScript/TypeScript frameworks.
• Collaboration: Work effectively in a team setting to deliver robust web applications, adhering to project deadlines and quality benchmarks.
• Version Control: Manage and track changes using Git for efficient collaboration.
• Debugging: Identify and resolve issues in a timely manner, ensuring seamless performance and user satisfaction.

What We’re Looking For

• Experience: 10+ years in web development, with a strong focus on frontend technologies.
• Technical Skills:
• Expertise in React.js, HTML, CSS, JavaScript/TypeScript, and jQuery.
• Familiarity with frameworks and libraries like Node.js.
• Proficiency in version control systems like Git.
• Design Sense: An attuned sense for design, ensuring smooth collaboration with UX teams.
• Soft Skills: Strong problem-solving abilities, attention to detail, and excellent communication skills.
• Education: Bachelor’s or Master’s degree in Computer Science, Computer Engineering, or a related field.

Job Description: Website Development Specialist

Position: Website Developer Executive

Job Location: Kolkata

Company: Lead Height

Company Location: 6A2, 6th Floor, Newtown Square Atghora, Newtown Road In Spencer Building, Kolkata, West Bengal 700136.

Salary (Fresher - Experienced): ₹9000 - ₹ 25000 (Basic Salary)

Job Type: Full-time

About Us: Lead Height Company is a dynamic and rapidly growing Digital Marketing Company in the IT Sector. We are the perfect blend of a creator and inventor. Lead Height was awarded the Best Startup Company 2020 for excellence and innovation. We are passionate and thrilled to stay updated about the latest marketing trends and techniques to optimize the key component of conversion rate, aiming to provide top-notch solutions to our clients and customers.

Job Responsibilities:

• Website Development: Design, develop, and deploy responsive and user-friendly websites using modern web technologies, ensuring compatibility across multiple browsers and devices.

• Front-end Development: Implement intuitive and visually appealing user interfaces using HTML, CSS, and JavaScript frameworks, ensuring seamless navigation and optimal performance.

• Back-end Development: Develop server-side logic and databases using programming languages such as PHP, Python, or Ruby, and frameworks like Django or Laravel, to enable dynamic functionality and data integration.

• Content Management System (CMS): Customize and integrate CMS platforms, such as WordPress or Drupal, to enable efficient content creation, publishing, and management.

• Web Application Development: Build interactive web applications, including e-commerce platforms, online portals, and custom web-based tools, incorporating secure and scalable coding practices.

• Cross-functional Collaboration: Collaborate with designers, UX/UI specialists, and other stakeholders to ensure the seamless integration of design elements and user-experience requirements into the development process.

• Testing and Debugging: Conduct thorough testing, debugging, and optimization of websites and web applications to ensure smooth functionality, responsiveness, and performance.

• Website Maintenance and Updates: Perform regular updates, maintenance, and security enhancements for existing websites, ensuring they remain up to date with the latest web standards and technologies.

• Documentation: Create and maintain technical documentation, including project specifications, code documentation, and version control, to facilitate efficient collaboration and future maintenance. Requirements:

• Web Development Skills: Strong proficiency in HTML, CSS, JavaScript, and other front-end technologies. Knowledge of back-end programming languages and frameworks is a plus.

• Frameworks and Libraries: Experience with popular front-end frameworks and libraries such as React, Angular, Vue.js, or Bootstrap, and familiarity with back-end frameworks like Node.js, Django, or Laravel.

• Database Management: Proficiency in working with relational databases (e.g., MySQL, PostgreSQL) and NoSQL databases (e.g., MongoDB) to design, develop, and optimize database schemas and queries.

• Web Standards and Optimization: Familiarity with web standards, SEO best practices, and website optimization techniques to ensure fast loading times and optimal performance.

• Problem-solving skills: Strong analytical and problem-solving abilities to troubleshoot and debug complex web development issues.

• Collaboration and Communication: Excellent teamwork and communication skills to collaborate effectively with cross-functional teams and translate requirements into technical solutions.

• Continuous Learning: Willingness to stay updated with emerging web technologies, programming languages, and industry trends to ensure the adoption of best practices and enhance skill sets.

• Portfolio: A portfolio showcasing previous web development projects or code samples will be advantageous.

Disclaimer: This job description is a general outline of the responsibilities and requirements expected of a Website Development Specialist. Duties may be subject to change based on the company's needs and the evolution of the digital marketing landscape. Compensation:

Base salary: ₹9,000 - ₹25,000 per month.

Based on Experience of Candidates.

Benefits:

• Comprehensive training and onboarding process.

• Opportunity for career growth and advancement within the company.

• Supportive and collaborative work environment. If you are a results-driven individual with a passion for Website development and a desire to contribute to the growth of a thriving company, we encourage you to apply for the Website Development Executive at Lead Height Company.

Join our team and be part of our exciting journey to success! Application Process: Interested candidates are requested to submit their updated resume along with a cover letter detailing their relevant experience and why they believe they are a suitable fit for the role. We look forward to reviewing your application

• Create website layout/user interface by using standard HTML/CSS practices
• Deep expertise and hands-on experience with Web Applications and programming languages such as HTML, CSS.
• The candidate must have a strong understanding of UI, cross-browser compatibility, general web functions, and standards.
• Candidate must have knowledge of standards used for creating a responsive website.
• The candidate will be able to edit digital images with photoshop.

• Proven experience of at least 1 year as a Web developer.
• Proficiency in front-end development web programming languages such as HTML and CSS, JQuery, and JavaScript.
• Proficiency in graphic design software including Adobe Photoshop, Adobe Illustrator, and other visual design tools.
• Excellent visual design skills.
• Creative and open to new ideas.
• Adaptable and willing to learn new techniques.
• Analytical mind and problem-solving aptitude

• Coding and debugging pure JavaScript, polyglot and multi-lingual applications.
• Working closely with Technical Lead/Project Manager to ensure development timelines are met.
• Contribute with ideas to improve system design or streamline product delivery.
• Working with challenging applications involving Real Time Data.
• Working on different platforms including the usage of the Native SDKs provided on JavaScript.

• Strong experience in developing applications using Javascript and Jquery.
• Minimum 6 months of experience in React.JS is a must.
• Experience in any other Javascript libraries is an added advantage.
• Create different types of Charts and Graphics with the help of HTML5 Canvas, SVG etc.
• Should possess understanding of UI design and its behavior across devices (desktops to smart phones).
• Good to have worked with APIs exposed by social media sites like Facebook, Twitter, Instagram etc.
• Experience in working with data structures such as XML and JSON.
• Added knowledge of mobile development frameworks like jQuery Mobile is an added advantage.
• Good communication and problem-solving skills.
• Should be a self-starter and should have the ability to work under pressure.
• Should be passionate about sports.

*Only Immediate Joiners


DESCRIPTION
We are looking for a great Frontend 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

• Developing new user-facing features using React.js
• Building reusable components and front-end libraries for future use
• Translating designs and wireframes into high quality code
• Optimizing components for maximum performance across a vast array of web-capable devices and browsers

REQUIREMENTS

• Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model
• 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
• Familiarity with RESTful APIs and sockets
• 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.
• Ability to understand business requirements and translate them into technical requirements
• A knack for benchmarking and optimization
• Familiarity with code versioning tools
• Experience with PWAs and React Native is a huge plus

Job description 

Quantela is seeking UI Developer in development of web based front end applications for enterprises.  

Candidate should have sound understanding of Object-Oriented JavaScript concepts and JavaScript Debugging skills.  

Good working knowledge of HTML5, CSS3, structure, and semantics. 

Experience of CSS Pre-processors like Less, Sass, SCSS. 

Experience in JavaScript & jQuery 

Must have basic knowledge of core concepts of Angular 2+ is must 

Experience in typescript Understanding of version control systems like Git, SVN. 

Good communication & analytical skills 

Candidate should have excellent written and verbal communication skill and a positive attitude. 

• Develop and manage apps on React Native platform
• Analyse, code, debug, test, document & deploy applications
• Provide technical leadership and upgrade architecture design and solution to accommodate future expansion
• Ensure quality control processes are successfully employed.
• Experience in React-Native based app development is a must
• Experience in Mobile app development (Cross platform apps)
• Must have published at least 1 major React-Native app
• Knowledge of service workers implementation for Progressive Web Application (PWA)
• Demonstrated ability with HTML5, CSS3, Bootstrap, jQuery, and other JS frameworks React JS
• Development experience of UI (layouts, animations, etc.)
• Good understanding of Design and Architecture Patterns
• Understanding of iOS and Android Code signing process and deployment model
• Understanding of Unit Testing, Debugging Methodology used in React Native Apps
• Understanding on integration of native modules with React Native code
• Experience with caching and scaling techniques