React.js 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.

Profile Overview:

We are looking for passionate and keen-eyed front-end developers with 5+ years of experience in React JS for a major project to join our creative front-end development team who can add optimization and efficiency to the user experience and maintain brand consistency across all web page of the web products.

The front-end developer will closely coordinate with our back-end developers, graphic designers and UI designers to ensure all elements of the web creation are consistent.

Responsibilities:

• Turning UI/UX designs into prototypes, creating excellent interactive forms of designs, writing reusable modules and maintainability of the code.

• Implement UI development principles to ensure that the product client-side serves at scale.

• Review and optimize the application usage by monitoring key metrics and rectifying the issues proactively.

• Determining the structure and design of web pages.

• Ensuring user experience by analyzing the design choices.

• Developing features to enhance the user experience.

• Striking balance between functional and aesthetic design.

Requirements:

• Bachelor’s or Master’s degree in computer science, computer applications or related fields.
• Proven working experience as a React Developer for 5+ years and above.
• Hands-on experience with HTML5, CSS3, and  CSS frameworks.
• Demonstrable knowledge of Web services, Web API, REST services & GraphQL.
• Expertise in UI design and development of responsive web applications using React, Redux, Flask and Hooks.
• Applicable knowledge of Social API integration, Core location APIs, Web Views, Payments integration
• Proficiency in understanding layout aesthetics.
• Excellent analytical, problem-solving and multitasking skills.
• Ability to solve novel and challenging React problems.
• Capability to understand, develop and sustain continuous integration and delivery.

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.

1. Good experience in react components, hooks and state.
2. Experiences in the implementation of responsive web layouts
3. Ability to discuss and explain design options.
4. Good experience with HTML5 & CSS3, Bootstrap Good understanding of JavaScript.
5. JavaScript libraries and CSS frameworks are preferred.

• Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model
• Thorough understanding of React.js and its core principles
• Prior experience with popular React.js workflows (such as Flux or Redux)
• Familiarity with more current specifications of EcmaScript
• Prior experience with data structure libraries (e.g., Immutable.js)
• Knowledge of isomorphic React is a plus
• Familiarity with RESTful APIs
• Familiarity with HTML / CSS
• GIT experience is a plus
• 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

Job Title: UI Developer- HTML / CSS / JavaScript

Department: Technology and Research

Location: Mohali, Punjab

Reports to:  Technical Lead

Context

Sampana Digital (SDPL) (http://www.sampanadigital.com">www.sampanadigital.com)  is a digital technology company that provides end-to-end product engineering and digital transformation services. Our engineering services includes web & mobile application development, user experience design, cloud, testing and infrastructure managed services to transform businesses digitally. We also enable enterprises with contextual and personalized two-way multi-channel mobile communications, including SMS, voice, email and PWA technology.

We believe in small teams of smart, committed, and diverse individuals coming together and form a breakthrough insight. We are a team of passionate professionals to craft an unbeatable culture and services.

Come and join us!   

Role Description

We are looking for a creative and skilled UI Developer to develop websites and applications with functionality and aesthetics in mind. The UI Developer will work with Back-End Developers and Front End Developers to ensure that the website is optimized for several devices and presented in an attractive way. As a UI Developer one must have excellent knowledge of HTML, CSS and JavaScript.

Job Responsibilities

• Writes high quality code & unit tests, builds, tests as per agreed timelines
• Participates in technical design and provides estimation
• Owns one or more small to medium features
• Becomes a go-to person in at least one area
• Communicates clearly and gets clarification upfront to minimise rework.

Skills

• Exhibit strong problem solving skills, helps other developers and demonstrates teamwork
• Understands detailed requirements and demonstrates excellent problem solving skills
• Deep understanding of software engineering practices, Design Patterns.
• Hands-on experience in UI framework
• Understanding of web markup, including HTML5, CSS3 and cross-browser compatibility issues.

• Proficiency in converting visual design (created in Adobe Photoshop, Illustrator,etc) into HTML CSS.

• Strong sense of ownership, drive and ability to deliver results
• Strong communication skills
• Must have experience in bootstrap/ responsive design
• Experienced in web performance testing tools

Responsibilities :

• Manage product milestones, deployment cycles & overall product roadmap 
• Understanding of the threading limitations of AngularJs, reactjs, and multi-process architecture 
• Hands-on experience with cloud technologies like AWS 
• Familiar with various design and architectural patterns 
• Sound knowledge of Databases Postgres is a must including Performance Tuning, Designing and optimized Postgres databases and queries 
• Ability to communicate complex technical concepts to both technical and non-technical audience 
• Understanding of fundamental design principles behind a scalable application 
• At least 3-5 years of experience in consumer product engineering and architecture, with proven track record of architect impactful products in the internal CRMand consumer domain. 
• Proficient understanding of code versioning tools, such as Git 
• Ship great products under stringent deadlines and in the face of ambiguous requirements and changing business priorities 
• Maintain Code Quality, Implement Standards & improve overall understanding

What lands you in this role :

• Exceptional leadership skills and proven experience in shaping team culture
• Strong grasp of full-stack networking, scalable web back-end, and all genres of platforms
• Must have Bachelor degree in computer science from a Tier-1 College
• Multitasking & problem solving approach

If you are looking to be part of the early-stage start-up team that is charting the course and solving a key pain point for the CXO, this opportunity is for you. The opportunity will provide you join a company where you can contribute to all aspects of the product definition, product building and solving some key challenges.

• Architect solutions and execution through hands-on development, quality-assurance, and prototyping 
• Collaborate with a UX/UI designers and other front-end and middle-tier engineers to design, prototype, and build user interface for complex cloud-based product 
• Participate in complete development life cycle activities like design, coding, testing and production release 
• Develop and maintain a scalable web and responsive applications 
• Exhibit Devops mindset – Work on continuous integration, including provisioning, deployment, testing, and version control of the software 
• Mentor new software developers and junior engineers

• Passionate engineer with 5 – 8 years of hands-on experience of developing next-generation user interface with high quality and performance 
• Strong desire to learn & evaluate new libraries/frameworks, and share knowledge with others 
• Ability to work in a fast-paced and agile development environment 
• Sound knowledge of front end standards and practices 
• Translating designs and wireframes into high-quality code 
• Knowledge of Redux, React.js and its core principles 
• Familiarity with RESTful APIs 
• Strong proficiency in JavaScript, AJAX, HTML5, CSS3, JSON, including DOM manipulation and the JavaScript object model 
• Experience with popular JS frameworks and libraries (React, Angular, JQuery, Ember, Babel, Webpack etc.) 
• Experience of building Single-page Web Apps 
• Ability to understand business requirements and translate them into technical requirements 
• Experience with test automation: TDD, unit/integration/functional testing 
• Proficient with debugging and testing tools to troubleshoot and optimize the UI 
• Solid understanding of object-oriented design and programming concepts, core JavaScript concepts like scope/closures, the event loop and asynchronous callbacks, promises

Good to have

• Full-stack development experience 
• Prior Startup Experience 
• Prior experience in developing real-time web applications 
• Experience with continuous deployment 
• Proficiency with Git/Github 
• Experience with GraphQL

Success Factors

• Start-up mindset 
• Good problem solving abilities 
• ‘Can-do’ attitude 
• Prior experience of working with globally distributed teams is an added advantage 
• Work with minimal supervision 
• Excellent communication skills and being able to work independently or in a full team

Our team is looking for fast-moving engineers with an entrepreneurial mindset. As a software engineer, you will help grow the platform by identifying new features, products, and business opportunities. You will write and own scalable production-grade code across the platform in collaboration with the small, close-knit and dedicated global development team.

We keep cloud-native concepts close to our heart whenever we design any software component and you will have exciting opportunities to work on new software frameworks, modern tech stack and cloud-native applications using latest cloud technologies.

If you want to feel and see that your contributions matter, have a strong desire to work for an early-stage startup and if you love working in a dynamic, agile, continually improving environment and most importantly, work with good people, come talk to us. If you are excited about the opportunity to build a cool new Cyber Security SaaS product ground-up then lets talk!!