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.

We are seeking a highly motivated Software Development Engineer with expertise in building scalable, extensible and user-friendly web applications. You will work with a fast paced Product Engineering team to build efficient and reusable web applications for mobile and fixed devices. 

What you’ll do:

• Architect, Design, Code reviews and build scalable applications.
• You will be engaged in identifying and addressing performance bottlenecks, and collaborate with other team members to innovate current/new products. 
• Identify, communicate and implement best practices for application engineering. 
• Ensure high scalability and performance

• You will advocate for good, clean, well-documented and performing code; define and follow standards and best practices for front-end development.

We’d love for you to have:

• Experience: 1-3 yrs recent experience of working in a scalable web product firm
• Education: B.Tech/M.Tech  in Computer Science from Top ranked colleges in India
• Excellent software development skills in developing web applications over client-side frameworks - Backbone, React (preferred) and/or angular frameworks (preferred); and server-side frameworks like node.js
• Excellent programming skills in object-oriented, modularised JavaScript, Typescript (preferred)
• Strong knowledge and working experience in server-side Event-driven programming using Node.js
• Excellent programming skills in Javascript,  jQuery, AJAX, YUI.
• Passion for writing optimized code using JS best practices  and design patterns
• Experience with JS or Java-based Unit/Integration Testing using Selenium, Appium, Selendroid
• Hands-on experience in building scalable web applications
• Excellent problem solving and debugging skills
• Good Knowledge of version control - GIT (preferred)
• Experience with the full software development lifecycle, design, develop, debug, document, and deliver (especially in a multiple site organization)
• Strong verbal and written communication skills
• Ability to deliver great results in an agile development
• Good to have: Working knowledge of web standards (i.e., REST) and OOPS
• Good to have: Experience in Data Structures, Algorithms and their optimization

Even if you don’t meet all of these qualifications above, we’d still love to hear from you. Tell us about your unique qualifications in your cover letter.

CaaStle is committed to equality of opportunity in employment. It has been and will continue to be the policy of CaaStle to provide full and equal employment opportunities to all employees and candidates for employment without regard to race, color, religion, national or ethnic origin, veteran status, age, sexual orientation, gender identity, or physical or mental disability. This policy applies to all terms, conditions and privileges of employment, such as those pertaining to training, transfer, promotion, compensation and recreational programs.

About Visdum

Visdum is the world’s leading SaaS Solution for Sales Compensation Management.

Founded in 2020 by ex-Oracle Executives who have 50+ years of experience in the IT

industry, we’re an early-stage SaaS startup with a mission to democratize sales

commissions.

Visdum helps Finance, Revenue Operations, and Sales teams manage and optimize sales

incentive compensation process, giving real-time visibility to payouts and a decrease in

calculation errors. Visdum helps SaaS teams around the world save hundreds of hours by

automating commissions and drive higher sales revenue with a motivated sales team.

Our Impact So Far

13+ Countries Served

$50M+ Commissions Processed

We achieved all of this with a nimble team of 15

Job Role: Content Marketer

Location: Noida, India OR Remote

The Opportunity

We are seeking a highly skilled React.js Developer with 2-3 years of experience to join our dynamic

team. The ideal candidate will be responsible for developing high-quality web applications using

React.js and will be able to work collaboratively with other developers, designers, and project

managers.

Responsibilities

● Develop high-quality, responsive web applications using React.js

● Collaborate with cross functional teams to define, design, and ship new

features

● Write clean, maintainable, and efficient code

● Ensure the technical feasibility of UI/UX designs

● Optimize web applications for maximum speed and scalability

● Implement automated testing and deployment processes

● Participate in code reviews and provide constructive feedback to other

developers

● Stay up-to-date with emerging trends and technologies in front-end

development

Requirements

● 2-3 years of experience in React.js development

● Thorough understanding of React.js and its core principles

● Strong proficiency in JavaScript, HTML, CSS and related web technologies

● Understanding of RESTful API design and implementation

● Familiarity with version control systems (Git, SVN, etc.)

● Strong problem solving skills and attention to detail

● Excellent communication and collaboration skills

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

● Familiarity with code versioning tools.(such as git)

● Experience with modern build pipelines e.g., Webpack

About us:

HappyFox is a software-as-a-service (SaaS) support platform. We offer an enterprise-grade help desk ticketing system and intuitively designed live chat software.

We serve over 12,000 companies in 70+ countries. HappyFox is used by companies that span across education, media, e-commerce, retail, information technology, manufacturing, non-profit, government and many other verticals that have an internal or external support function.

To know more, Visit! - https://www.happyfox.com/

We’re looking for an experienced Technical Lead – Frontend Engineer to join our growing engineering team to help build and maintain HappyFox’s product offerings. 

What you can expect as a Technical Lead at HappyFox:

• You will consistently ship features and improvements and lead a team of engineers working on our product roadmap.
• You will oversee software architecture, Git workflows, and CI/CD processes and perform code reviews to ensure exceptional code quality.
• You will actively work towards identifying, minimizing, and managing technical debt in the codebase.
• You will improve the development experience and the quality of the codebase. 
• You will define our internal standards for coding style, maintainability, and best practices for a large-scale web application. 
• You will uphold the best practices and coding standards for the team through code review and technical feedback.
• You will take responsibility for key technical architecture and design decisions.
• You will take ownership of the stability and performance of the services that you work on.
• You will contribute to the strategic vision and long-term roadmap in your area of expertise.

You should apply if:

• You have 2+ years of experience in a technical lead role designing and building single-page web applications.
• You have 8+ years of relevant professional experience in building web applications with javascript frameworks like Ember.js or React.js.
• You have deep knowledge of HTML, CSS, and JavaScript
• You have experience building single-page apps and a good understanding of the best practices and coding patterns.
• You have a passion to dig into technically complex problems to troubleshoot and figure out a solution.
• You have a desire to continuously improve and ship the best quality product.
• You have a pragmatic approach to making sure technical decisions align with actual business needs.
• You have a good understanding of the trade-offs when building for product value, reliability, or performance.
• You have excellent communication skills with the ability to discuss and explain your point of view clearly and effectively.

• Require Angular (2+) Developers having experience of min. 2 years for a long term project.
• The candidate should be able to work independently for the given task.
• Job Location: Gandhinagar, Gujarat.

About Company

• VedikIn Solution is one of the leading web development & web hosting company providing a large number of services starting from web development to mobile app, eCommerce platform, cloud solutions, web hosting services, etc.
• We have a better work culture of fixed working hours, ideas flowing free flow, monthly entertainment trips & continuous appreciation for good work.

• We are located in Gandhinagar, Gujarat since 2016. As part of the expansion, we are currently hiring passionate and talented developers who want to join VedikIn's exponential growth & adventurous journey.

Responsibilities

• The candidate should be able to complete assigned work independently in a timely manner.
• The candidate should be able to communicate with the client independently.

Benefits

• Traveling allowance
• Monthly fun activities
• Monthly team building activities along with team lunch/dinner
• Flexible work timing

Job Type: Full-time

Salary: Up to ₹70,000.00 per month

COVID-19 considerations:
Mask is compulsory, Regular sanitization work is done at the office.

• Bachelor’s Degree in Computer Science or related field
• 3-5 years’ web development experience required
•  Experience on React js , Angular js and Vue js.
• Proficiency with AngularJS an asset
• Strong knowledge of web development tools and programming languages

• Responsible for development of new highly responsive, web-based user interface
• Construct visualizations that can depict vast amounts of data
• Work and collaborate with the rest of the engineering team
• Work with product team and graphic designers
• Learn and understand user interactions
• Develop a flexible and well-structured front-end architecture, along with the APIs to support it

Requirements and qualifications

• B.S Degree in Computer Science
• Experience with JavaScript
• Experience with REACT
• Experience with HTML / CSS
• Experience with REST API's
• Git knowledge is a plus
• Team player
• Good time-management skills
• Great interpersonal and communication skills