Sr. Frontend 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.

Roles and Responsibilities :
- To  analyze business requirements, prepare design and implementation recommendations and estimate development effort
-  Collaborate with cross-functional teams to define, design, and ship new features
- Lead or participate in design reviews, code reviews and architecture evolution discussions
- Unit-test code for robustness, including edge cases, usability, and general reliability
- Work on bug fixing and improving application performance
- Continuously discover, evaluate, and implement new technologies to maximize development efficiency

Skills Required :
- Experienced with front end programming language with React JS.
- 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).
- Knowledge of modern authorization mechanisms, such as JSON Web Token.
- Familiarity with modern front-end build pipelines and tools.
- Familiarity with code versioning tools (such as Git, SVN, ).
- Candidates with Good communication Skills. 

This company is a network of the world's best developers - full-time, long-term remote software jobs with better compensation and career growth.  We enable our clients to accelerate their Cloud Offering, and Capitalize on Cloud.  We have our own IOT/AI platform and we provide professional services on that platform to build custom clouds for their IOT devices.  We also build mobile apps, run 24x7 devops/site reliability engineering for our clients.

You will be working on AI/IOT react native mobile apps and responsible for hands-on coding. 
We need someone who can write well designed, testable, efficient code by using the best software.

We are looking for a can do it attitude, and the ability to deliver with high velocity and high-quality at the same time.  You must have experience developing and designing amazing UI screens.

This person MUST have:

• BE Computer Science, MCA or equivalent
• Mobile app development experience.
• Good understanding of the full mobile development life cycle,strong debugging and problem-solving skills.
• Unit-test code for robustness, including edge cases, usability, and general reliability.
• Strong React Native experience
• Understanding of APIs, pagination,searching,sorting
• Creating high performance UI etc.
• Familiarity with native build tools, like XCode, Android Studio, Gradle.
• Leverage native APIsfor deep integrations with both platforms.
• Strong communication skills.

Experience:

• Min 3 year experience
• Not more than 15 year experience.
• Startup experience is a must. 

Location

• Remotely, anywhere in India

Timings:

• 40 hours a week but with 4 hours a day overlapping with client timezone.  Typically clients are in California PST Timezone.

Position:

• Full time/Direct
• We have great benefits such as PF, medical insurance, 12 annual company holidays, 12 PTO leaves per year, annual increments, Diwali bonus, spot bonuses and other incentives etc.
• We dont believe in locking in people with large notice periods.  You will stay here because you love the company.  We have only a 15 days notice period.

What do we do?

About MobileFirst: Mobile design & development studio focusing on great mobile app experiences. We have great exposure working with Startups, Enterprises and Design Studios. MobileFirst has worked with customers from the USA, India, UK, Kenya, and Israel.

We have catered to clients in Automobiles, Paints, Fashion, Sports, Transportation, Food, Music, Coupons, Smart Parking, Uber for X, etc.
 

What are we looking for?

• 1+ yr experience with React JS & React Web UI
• MEAN Stack or MERN Stack Experience is required
• MongoDB, Express JS, Angular JS & NodeJS  
• Understanding of React & Redux is required
• Experience with MongoDB, Postgresql, MySQL database
• Comfortable in a work environment that requires strong problem-solving skills and independent self-direction coupled with team collaboration and open communication
• Understanding of RESTful web services
• Work in a fast-paced, creative atmosphere to develop new ideas that adapt to evolving user needs
• Experience using Git / GitHub

What should you have?

• Amazing debugging skills and problem-solving abilities
• Knowledge of Opensource Libraries & frameworks  
• Command over algorithms, design trends & knowledge about popular applications on App 

Who are we looking for?

Tech Savvy. Fast learner. Leader. 
We don't see your college degree or we don't care if you are a dropout. 

Job Perks

• Great Fun Learning exposure
• Training and Seminars on new Technologies
• Startup Experience
• Flexible timings and "work from home" options

Job Requirements/Responsibilities :

- Participate as a team member in all phases of software development lifecycle.

- Coordinating with the team on individual responsibilities and roadblocks.

- Perform design, development and testing on individual tasks

- Managing initiatives on UI/UX work

- Transparently share the challenges & feedback.

- Participate in integrated testing of product/ package.

- Designing a modern highly responsive web-based enterprise application component user interface.

- Building reusable components and front-end libraries for future use.

- Translating designs and wireframes into high-quality code.

- Learn and understand user interactions.

- Optimizing components for maximum performance across a vast array of web-capable devices and browsers

- Coordinating with various teams working on distinct layers.

- Providing technical assistance to the other teammates.

- Keep compliance with Quality Systems and Procedure

Responsibilities

• A complete ownership of the feature.
• Find innovative ways to increase efficiency/Application performance.
• Implement Visual Designs in standards compliant.
• Build efficient and reusable front-end systems and abstractions.
• Suggest and implement improvements to existing product interfaces.
• Ensure that all the assigned systems are performing to scale.
• Work closely with product management team to define and refine feature.

Requirements

• At least 2 years of product development experience with expertise in designing and implementing high-performance web applications.
• Strong hands-on experience in developing web applications using JavaScript.
• Strong experience and knowledge in single page frameworks using ReactJS and ability to design the architecture of single page applications.