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.

Certa (getcerta.com) is a Silicon Valley-based tech product start-up that is automating the vendor, supplier, and other stakeholder onboarding processes (think background checks, agreements, and the works) for companies across industries and geographies. With multiple Fortune 500 and Fortune 1000 clients, at Certa's tech team, you will be working on stuff that is changing the way huge companies do business.

Must Haves:

• Experience developing enterprise-grade quality software.
• 3+ years of experience building large-scale front-end applications using React.
• 3+ years of experience using type-safe JavaScript-based languages, such as TypeScript.
• Understanding of modern frontend ecosystems, including Bundling(preferably using vite) Linting, Testing, Releasing.
• Success with mentoring mid-level & junior Engineers.
• Experience in Agile software development methodologies.
• Experience writing automated tests (e.g., Vitetest, Cypress, Jest, Testing Library).
• Experience in building, scaling & maintaining a design system from scratch.
• Experience in improving rendering as well as delivery performance for front-end applications.
• Experience in writing semantic HTML.
• Experience in building scalable, responsive, and cross-browser-compatible web applications.
• Experience in a peak-performance organization, preferably a tech startup.
• Experience working with a remote team.
• Data analysis experience, and understanding of how analytics can help with product decisions.

Bonus:

• Experience building integrations and data synchronizations with event pub/sub-models.
• Experience with WebGL
• Experience in building offline applications using Web Workers
• Open source contributions.
• Running his/her own blog.
• Experience with building 100% keyboard and screen reader-accessible applications.
• Experience setting up and customizing JavaScript tooling and building systems.

About the Role

We are looking for a motivated Frontend Developer Intern who is passionate about building modern, scalable, and high-performance interfaces. You will work on production-grade applications built with Next.js, React, Tailwind CSS, and TypeScript, and collaborate directly with senior engineers to deliver high-quality UI components and user experiences.

This internship will give you hands-on exposure to real engineering workflows, version control, code reviews, and agile development.

Key Responsibilities

• Develop responsive and accessible UI components using Next.js, React, Tailwind CSS, HTML, and CSS.
• Work with TypeScript to ensure readable, safe, and maintainable code.
• Integrate APIs and handle client-side state management.
• Collaborate with backend and design teams to implement end-to-end features.
• Maintain component-level consistency, performance, and reusability.
• Write clean, modular code following best practices and coding standards.
• Contribute to improving UI/UX through thoughtful design and user-centric development.
• Work with MongoDB when required for basic CRUD operations or prototype integrations.

Required Skills

• Strong understanding of React.js fundamentals.
• Hands-on experience with Next.js (SSR, SSG, API routes).
• Solid knowledge of Tailwind CSS, HTML5, CSS3, and modern styling practices.
• Basic understanding of TypeScript.
• Familiarity with Git/GitHub workflows.
• Understanding of responsive design principles and accessibility.

Good to Have

• Certifications in Tailwind CSS, CSS, or Next.js (highly preferred).
• Knowledge of component libraries, animations, or design systems.
• Understanding of MongoDB basics.
• Exposure to UI/UX tools (Figma, Adobe XD) is a plus.

Eligibility

• Students currently pursuing a Bachelor's/Master's in Computer Science, Engineering, or a related field.
• Fresh graduates may also apply.
• Ability to dedicate full-time hours during the internship period.

What You Will Gain

• Mentorship from senior engineers and architects.
• Experience building production-grade frontends for modern SaaS/AI products.
• Opportunity to work in a fast-growing, innovation-driven environment.
• Strong portfolio additions through meaningful project contributions.

Work Mode

• Fully Remote
• Flexible working hours
• Merit-based growth and long-term opportunities

What you need to have:

Roles and Responsibilities

• Design and implement components of our web application, and admin panel
• Build a robust, lightweight, and high-performance client-side app
• Translating designs and wireframes into high quality code
• Write documentation and guides for web app & admin panel

Key Qualifications

• Expertise in ReactJS/Redux
• Working knowledge of TypeScript or Flow is a plus
• PURE experience of 1.5 Years and more in Frontend Development
• Expert-level knowledge of developing, shipping, and maintaining Javascript applications
• Knowledge of general software design patterns
• Deep understanding of Javascript
• Up-to-date on the latest build tools, and libraries such as ES6, Webpack, Babel
• Proficient in Javascript with strong object-oriented design skills
• Able to work independently and drive results