React.js Developer

About the Role

We are looking for a Senior Web Engineer to architect and build the entire web experience using Next.js and

React — a consumer-facing trading app with real-time data, SEO-optimised public pages, and internal admin

tooling. What We’re Looking For

You have built production web applications from zero to launch using Next.js. You are comfortable across the

full web stack — SSR/SSG, real-time WebSocket handling, responsive design, and performance optimization.

Ideally, you have worked on trading platforms, dashboards, or data-rich fintech products. You take ownership of

your codebase, care about developer experience, and can work independently to deliver high-quality, production-ready code. What You’ll Do

• Architect and build the Next.js web platform from scratch — project structure, CI/CD, component library, and design system. • Build real-time, data-intensive interfaces — live price rendering, interactive charting, and responsive

dashboards. • Build SEO-optimised content pages and public-facing discovery surfaces. • Build internal admin and operations tooling — dashboards, data tables, configuration interfaces, and

monitoring views. • Define frontend engineering standards — component architecture, testing strategy, accessibility, and

performance budgets. • Own cross-browser compatibility, Core Web Vitals, and responsive design across devices. • Drive code reviews, mentor team members, and champion best practices across the web team. Must-Have

• 4+ years frontend engineering with React in production; 2+ years with Next.js specifically. • Strong TypeScript skills and experience with SSR, SSG, and incremental static regeneration. • Experience building real-time features with WebSockets in web applications. • Experience with Tailwind CSS or utility-first CSS frameworks. • Experience building both consumer-facing and internal admin/dashboard UIs. • Understanding of SEO best practices — structured data, meta tags, Core Web Vitals.

• Familiarity with CI/CD, CDN deployment, and web performance optimization. Nice-to-Have

• Prior experience building trading platforms, brokerage dashboards, or fintech web apps. • Experience with charting library embeds (TradingView, Lightweight Charts, Highcharts). • Experience building complex admin portals with advanced table views, filters, and real-time updates. • Familiarity with search integration (Typesense, Algolia). • Experience with accessibility standards (WCAG 2.1) and internationalization (i18n). Tech Stack

Framework Next.js 14+, React 18+

Language TypeScript

Styling Tailwind CSS, Headless UI / Radix

Real-time WebSocket, SWR / React Query

Charting Charting library embed, Recharts / D3

Admin TanStack Table, React Hook Form

Deployment Vercel / AWS CloudFront, CDN, Edge functions

Testing Jest, Playwright (E2E), Lighthouse CI

Experience: 5-10 years experience

Location: Bangalore

Required Skills and Experience:

• 5-10 years of experience in front-end development, with a strong focus on React.js.
• Proven experience with React.js and related technologies (e.g., Redux, React Router, Hooks, Context API).
• Strong proficiency in JavaScript, HTML5, CSS3, and modern front-end build tools (e.g., Webpack, Babel, etc.).
• Hands-on experience with RESTful APIs, Server Sent Events, WebSockets
• Hand’s on experience with web components, microfrontends
• Deep understanding of browser apis like history, intersectionobserver, event handling, virtual panes, drag and drop etc
• Ability to work on a complex and fast moving code base.
• Familiarity with TypeScript and its integration with React applications.
• Strong problem-solving skills and attention to detail.

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

The ideal candidate will be responsible for designing, developing, testing, and debugging responsive web and mobile applications for the company. Using React Js, MySQL, JavaScript, HTML, and CSS, this candidate will be able to translate user and business needs into functional frontend design. 

Responsibilities

- Must have

    - Experience with React and Redux or similar programming

    - Experience in Rest API integration

    - Passionate about user experience

     - Android and IOS development

- Other requirements

    - Good knowledge of Javascript functions and operators

    - Responsibility for major tasks and chores

    - Willing to resolve technical debt in the early step

    - Good understanding of sprint cycle in agile

    - Can communicate with developers and non-developers

    - Can work independently but a great collaborator

    - Serverless API experience is not counted

    - Good to have Git workflow knowledge

    - Good to have Github collaboration experience

Qualifications

• Bachelor's degree or equivalent in Computer Science
• 2+ years experience in frontend development
• Familiarity using Scrum/Agile development methodologies
• Experience building object-oriented web applications in React Js, MySQL, JavaScript, HTML5, and CSS3

1. Hands on Expert in UI/Front End Engineering/Development specifically React,
2. Redux, NodeJs who can code, design and own front end development and code.
3. Experience in React v16, Reach Redux, React Fibre and JavaScript advance (ES6+),
4. Experience in Advance State Management [Example: Redux, Mobx, RxJs, GraphQL etc]
5. Good experience on UI framework like Angular JS/ Vue JS/ Ext JS/jQuery/ React JS or equivalent SPA framework
6. Experience in HTML5, Javascript CSS3, ExpressJs, GraphQL
7. Strong understanding of Rest APIs, Web Sockets, Service Workers, HTTP/S Protocol, Web Security and Cloud Infrastructure, CI/CD, Web Packaging and Optimization, UX and Styling.
8. Expertise in Advance Java-Scripts
9. Knowledge and experience with Data Structure and Design methodologies.
10. Problem solving skill
11. Good experience working in Agile/Scrum teams
12. Good written and verbal communication skills.