Frontend Developer/Reactjs/Angular

·      7+ years of professional experience in front-end development.

·      5+ years of hands-on experience with React.js and its ecosystem (Redux, Context API, Hooks, etc.)

·      Strong understanding of JavaScript (ES6+), HTML5, and CSS3.

·      Experience with RESTful APIs, GraphQL, and WebSocket integration.

·      Proficiency in modern build tools (Webpack, Vite, Babel, etc.).

·      Expertise in state management libraries (Redux, MobX) and React Query.

·      Solid understanding of UI/UX principles and responsive design.

·      Experience with testing frameworks (Jest, React Testing Library, Cypress, etc.).

·      Familiarity with modern CI/CD pipelines and version control tools (Git).

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.

We’re Building the Future of Immigration Tech

We are developing a high-performance, AI-driven immigration platform that automates visa assessments and guidance for high-skilled immigrants. Our focus is on speed, accuracy, and scalability—not a flashy UI, but a powerful decision-making engine that delivers real value.

We need top-tier engineers who build for performance over aesthetics. If you love AI, automation, and disrupting old systems, this is for you.

🛠 Open Roles

1️⃣ AI/ML Engineer (Visa Assessment AI)

• Develop a cutting-edge AI model for visa eligibility assessments.
• Use NLP to process immigration laws, policies, and case precedents.
• Optimize for accuracy, efficiency, and scale (real-time processing).

2️⃣ Full-Stack Developer (Lean & Scalable Web App)

• Build a high-performance, no-frills web app (React/Next.js preferred).
• Integrate the AI model seamlessly into a secure and scalable backend (Python/Django or Node.js).
• Implement fast data retrieval for applicant evaluations.

🔍 Who We’re Looking For

✔ AI/ML Engineer: Strong experience in NLP, AI automation, and structured data processing. Experience with TensorFlow/PyTorch/OpenAI APIs is a plus.

✔ Full-Stack Developer: Expertise in React (Next.js preferred), Python/Django, or Node.js. Must prioritize performance & security.

✔ Both: You’re a problem-solver, performance-obsessed, and thrive in lean environments.

💻 Tech Stack (Recommended, Open to Suggestions)

• AI/ML: Python (FastAPI, TensorFlow, OpenAI APIs, Hugging Face NLP)
• Frontend: React, Next.js (for speed & SEO)
• Backend: Python/Django or Node.js (for performance & scalability)
• Database: PostgreSQL or Firebase

We are looking for a React JS Developer responsible for developing and maintaining rich user interfaces for modern internet-based web applications. Your primary focus will be to implement a complete user interface for a web application, with a focus on performance. Your main duties will include creating modules and components and coupling them together into a functional application following the design patterns and best practices. You will work in a team with the back-end developers and communicate with the API using standard methods. A thorough understanding of all of the components of the platform and infrastructure is required.

Experience Required : 3 + Years

• Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model

• Experience with popular React.js workflows (such as Flux or Redux)

• Experience with data structure libraries (e.g., Immutable.js)

• Familiarity with RESTful APIs

• 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.

• A knack for benchmarking and optimization

• Familiarity with code versioning tools (such as Git )

• Solid expertise in using cloud platforms (AWS, Google Cloud, and others)

Work Responsibilities

• What You’ll Do:
• Engineers will develop and improve features for products such as WebView pages called from within Mercari’s web version and native app, along with tools used by the Customer Support Team for answering user inquiries and providing transaction support.
• Senior engineers in the Frontend Team are expected to use their technical skills to lead the team and product development, train members through design and code reviews, and make contributions and improvements to the hiring process, including technical tests.
• Development Environment:
• Languages: HTML, CSS, JavaScript, TypeScript, React, Gatsby, Next.js, GraphQL, Apollo Client, Redux, Cypress, Rendertron, Lit, Playwright
• Infrastructures: Google Cloud Platform (Compute Engine, Kubernetes Engine, App Engine)
• Configuration management tool: Terraform
• Other: Circle CI, GitHub, Slack, JIRA, Crowi, Spinnaker, Datadog

Minimum Requirements

• Shared understanding and belief in Mercari Group's mission and values
• At least 3 years of experience in development related to frontend fields such as web browsers, JavaScript, TypeScript, React.js, Next.js, or Redux
• Experience with developing and operating large-scale products
• Ability to design and develop with performance and scalability in mind
• Ability to use HTML and CSS to implement solid user interfaces
• Knowledge of JavaScript and experience developing with UI libraries or frameworks such as React, Vue.js, and Angular
• Able to understand and explain web operation principles and browsers
• Understanding of version management and ability to participate in development via Git
• Effective communication skills, needed for product development with team members and with other teams

Preferred Requirements

• Extensive knowledge of standard web technologies and specialized knowledge in some areas, like TypeScript, React.js, Next.js, Redux
• Understanding of the characteristics of different libraries/frameworks and the ability to introduce them to projects where necessary
• Ability to design architecture based on the characteristics of the app
• Ability to consistently take initiative in implementing improvements to the app
• Project management and/or team leadership
• Cloud development experience (preferably GCP or AWS)
• Experience contributing to an open-source project
• Familiarity with CI systems and the release process

Working Conditions

Employment Status

Full-time

Office

Bangalore

• Hybrid Workstyle

We are looking for a Senior Front End Engineer.

• Hands-on with contemporary javascript frameworks (React js Angular js)
• Hands-on with UI layouts, SASS, LESS, Bootstrap
• Developed reusable components and libraries for frontend
• Frontend optimization techniques to reduce latencies
• Frontend optimization for SEO
• Excellent written and verbal communication skills, design thinking
• Practical experience with engineering best practices and Technology

Key Responsibilities:

• Build desktop and mobile web applications using contemporary javascript frameworks

•Actively participate in design and code reviews to build robust
applications and prototypes

•Explore and design simple and intuitive consumer experiences

•Work closely with Product managers, UX designers and back end
engineers to implement frontend solutions

•Build reusable code and libraries for future use, focus on long-term code
maintainability

•Work in a fast-paced and agile development environment

Job Title

Senior Frontend Developer (SDE-2)

Responsibilities:

• Collaborating with the UX team, product managers, back-end engineers and other technical teams to create new, delightful and scalable UI
• Taking responsibility for all front end development on a project
• Taking initiatives to build better and faster solutions to the problems of scale 
• Adhering to style standards on fonts, colors and images
• Mentoring junior devs and helping them out with bugs
• Taking initiatives to improve the codebase, DX, abd performance
• Building out UI from design mockups & conducting layout adjustments based on feedback from users
• Being on production support 

Requirements:

• Knowledge of and experience in advanced Javascript framework: ReactJS, AngularJS, and VueJS
• 3-5 years of overall experience
• Familiarity with common Javascript Libraries such as jQuery would be a plus
• NodeJS knowledge is a plus
• Knowledge about UI testing automation
• UI Performance: should have hands on experience of optimizing page load, rendering, and caching
• Sense for appeal & aesthetics from a usability perspective

View Less

Skills

REACT.JS, FRONT END, LEADERSHIP SKILLS

Requirements and Qualifications

• Bachelor’s or master degree in engineering
• 4+ years of work experience.
• Proficient understanding of HTML, CSS, and Javascript
• Proficient understanding of ReactJs or similar library
• Good understanding of responsive web development
• Good understanding of SEO and analytics
• Ability to break the business problem into smaller features
• Ability to access the technical feasibility of UI/UX designs
• Build reusable code and libraries for future use
• Optimize application for maximum speed and scalability
• Proficient understanding of cross-browser compatibility