Senior React JS Developer

Frontend Developers

• Contract To Hire (Initial Engagement: 6 months)

Experience: 5+ years

Mandatory Skills:

● React.js

● React Native

● JavaScript

● Experience in developing scalable and maintainable web and mobile applications

● Frontend architecture and reusable components

● State management

● REST API/backend service integration

● Application performance optimisation

● Authentication/authorisation and frontend security

● Git and pull-request-based development

● Clean, reusable and testable code

● Agile/product development experience

● Code reviews, debugging and production issue resolution

Good to have:

● TypeScript

● Next.js

● Jest / React Testing Library

● CI/CD

● Application monitoring

● Mobile deployment

About NonStop io Technologies:

NonStop io Technologies is a value-driven company with a strong focus on process-oriented software engineering. We specialize in Product Development and have a decade's worth of experience in building web and mobile applications across various domains. NonStop io Technologies follows core principles that guide its operations and believes in staying invested in a product's vision for the long term. We are a small but proud

group of individuals who believe in the 'givers gain' philosophy and strive to provide value in order to seek value. We are committed to and specialize in building cutting-edge technology products and serving as trusted technology partners for startups and enterprises. We pride ourselves on fostering innovation, learning, and community engagement. Join us to work on impactful projects in a collaborative and vibrant environment

Brief Description:

NonStop io is seeking a proficient React.js developer to join our front-end development team. In this position, you’ll be mainly crafting and integrating UI components through React.js methodologies and workflows like Mobx and Redux.

Responsibilities:

● Developing and implementing UI components using React.js

● Collaborating with cross-functional teams to design and ship new features

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

● Translating designs and wireframes into high-quality code

● Optimizing components for maximum performance across various web browsers

● Troubleshooting and debugging issues to ensure smooth user experiences

● Participating in code reviews to maintain code quality and consistency

● Improvement and optimization of existing codebase

● Keeping up with industry trends

● Identifying issues with technologies and architecture and then implementing solutions

● Assist with ticket creation, refinement, and estimation

● Participate in sprint planning and ticket distribution for frontend team

Qualifications & Skills:

● Proficiency in React.js and its core principles

● Strong JavaScript, TypeScript, HTML5, and CSS3 skills

● Experience with popular React.js state management libraries and approaches (such as Mobx, Redux, and Context API)

● Familiarity with RESTful APIs and integration

● Knowledge of modern authorization mechanisms, such as JSON Web Tokens

● Understanding of front-end build tools and pipelines

● Familiarity with any one of backend technologies such as Node.js, Java, or Python

● Excellent problem-solving and communication skills

● A strong attention to detail, and a passion for delivering high-quality code

● Expertise in designing scalable and efficient front-end architecture

● Adaptability to changing project requirements and priorities

● Experience with version control systems, particularly Git

● Experience working in Scrum and familiarity with Atlassian (Jira, Confluence, Bitbucket)

● Experience with diverse applications and architectural patterns

● A degree in computer science, software engineering, or a related field

● Strong understanding of object-oriented programming principles and design patterns

● Familiarity with automated testing frameworks and methodologies

● Excellent problem-solving skills and attention to detail

● Strong communication skills and ability to work effectively in a collaborative team environment

● Ready to be a tech-agnostic engineer and comfortable to shift on any tech stack

● Comfortable working with AI (Claude code, Cursor etc)

If you're passionate about technology and want to work on impactful projects, we'd love to hear from you

This role is for our client, who are reimagining video security for the modern world. Their cloud-native platform uses computer vision and AI to help businesses stay safe, make smarter decisions, and move faster; from real-time alerts to seamless clip sharing and multi-site visibility.

You’ll be joining an ambitious, fast-moving team that values clarity, craftsmanship, and impact. Every person there has a voice, ships meaningful work, and helps shape how AI can make the world safer and more connected.

Responsibilities

• Architect and scale high-performance React and TypeScript applications built for real-time surveillance operations.
• Build UI components for video playback, timeline scrubbing, and multi-camera grid management.
• Optimize client-side rendering, network bandwidth, and browser memory usage when streaming high-frequency data.
• Partner closely with Product, Design, and Machine Learning engineers to transform complex AI detection capabilities into simple user experiences.
• Establish frontend architecture patterns, maintain testing standards, and mentor team members.

Skills And Qualifications

• Experience building production web applications in React and TypeScript
• Deep understanding of frontend performance profiling, browser memory management, and client-side optimization
• Hands-on experience working with real-time data streams (WebSockets, SSE, or WebRTC)
• Strong software engineering fundamentals, including modular architecture, state management, and automated testing
• High bar for UI detail, usability, and web accessibility is a plus
• Experience with video technologies on the web (HLS, WebRTC, MSE, or Canvas/WebGL video rendering) is a plus
• Experience building spatial or location-aware dashboards using mapping tools (e.g., Mapbox, Leaflet) is a plus
• Prior experience in fast-paced startup environments or developer-centric B2B SaaS platforms is a plus

What We Offer

• Competitive compensation package
• Early-stage equity in a rapidly growing company
• Referral bonuses
• Team dinners and regular team off-sites
• The latest Apple products and unlimited tech stack

The company is on a mission to transform a $50B+ legacy industry by bringing the power of cutting-edge multimodal LLMs and computer vision to real-world security and operations. From firearm detection to intelligent access control, our AI-native platform turns every camera and sensor into a smart system that enhances safety, efficiency, and awareness.

Role Description

This is a full-time role for a React.js Developer who will be responsible for developing, maintaining, and optimizing responsive and scalable web applications. The successful candidate will work closely with UI/UX designers, backend developers, and product teams to convert designs and requirements into high-quality, production-ready applications. The role requires strong problem-solving skills, attention to detail, and the ability to take ownership of features from development through deployment.

Key Responsibilities

• Develop responsive and scalable web applications using React.js.
• Build reusable and maintainable frontend components.
• Convert UI/UX designs and Figma prototypes into functional web interfaces.
• Integrate frontend applications with REST APIs and backend services.
• Manage application state using Redux, Context API, Zustand, or similar technologies.
• Optimize applications for performance, responsiveness, and scalability.
• Debug and resolve frontend issues across development and production environments.
• Ensure cross-browser and cross-device compatibility.
• Collaborate with UI/UX designers, backend developers, QA, and product teams.
• Participate in code reviews and follow clean coding and development practices.
• Write and maintain appropriate tests for frontend applications.
• Stay updated with modern frontend technologies and best practices.
• Take ownership of features from development and testing through deployment and maintenance.

Requirements

• Strong proficiency in JavaScript (ES6+) and React.js.
• Good understanding of React Hooks, component architecture, props, state, and Context API.
• Strong knowledge of HTML5 and CSS3 and responsive web development.
• Experience integrating REST APIs and working with JSON.
• Experience with state management libraries such as Redux, Zustand, or similar.
• Experience with Git and GitHub/GitLab.
• Understanding of frontend performance optimization and browser debugging.
• 3+ years of hands-on experience in frontend development with React.js.
• Experience with TypeScript and Next.js is preferred.
• Familiarity with UI libraries such as Tailwind CSS, Material UI, or similar is a plus.
• Experience with frontend testing tools such as Jest, Vitest, or React Testing Library is a plus.
• Good problem-solving and analytical skills.
• Strong communication and collaboration skills.
• Ability to work independently, prioritize tasks, and meet deadlines.
• A proactive approach to learning and solving technical problems.

Candidates with strong practical experience, personal projects, GitHub contributions, or demonstrable frontend work may also be considered in place of extensive professional experience.

Job Description:

https://drive.google.com/file/d/12Fcie5u0rhyHeE_xhsNTeGk3mlPId1Mb/view?usp=drive_link

Key Responsibilities

Frontend & Extension Development

• Build and maintain highly responsive, modern user interfaces using React.js for web applications, browser extensions, and Electron-based desktop clients.

• Architect and develop modular, reusable UI components using Material-UI (MUI / Joy UI) and styled-components/Emotion.

• Manage complex multi-target build pipelines (Web, Extension, Electron) using Webpack and Craco.

AI Integration & Engineering

• Seamlessly integrate Generative AI capabilities into the frontend, including AI-driven chatbots, contextual AI suggestions, and RAG (Retrieval-Augmented Generation) interfaces.

• Collaborate closely with backend and AI specialists to consume AI-powered REST APIs and WebSocket streams, ensuring fluid and responsive user experiences.

• Implement robust markdown and code rendering (e.g., react-markdown) for rich AI conversational outputs.

Real-Time Data & State Management

• Implement low-latency, real-time communication features using Socket.IO for chat and collaborative functions.

• Efficiently manage complex application state, data fetching, and caching using modern tools like React Query and Axios.

Quality & Collaboration

• Work within a monorepo/workspace structure to maintain distinct client, component, and extension packages.

• Participate in code reviews to maintain high code quality, performance, and enterprise security standards.

• Collaborate with teams using Agile/Scrum methodologies for rapid and structured delivery.

Required Skills:

• Core Languages: Proficiency in JavaScript (ES6+) and TypeScript.

• Frontend Frameworks: Strong, hands-on experience with React.js (Hooks, Context), React Query, and React Router.

• Styling & UI: Deep understanding of HTML5, CSS3, and CSS-in-JS libraries (e.g., styled-components, react-jss). Hands-on experience with MUI (Material UI / Joy UI) is highly preferred.

• Architecture & Build: Experience configuring and optimizing builds with Webpack and Craco. Familiarity with npm workspaces/monorepos.

• Real-time & APIs: Ability to design and implement robust client-side integrations with RESTful APIs and WebSockets (Socket.IO).

• Agile & Workflow: Experience working with Agile and Scrum methodologies.

Preferred/Bonus Skills:

• Experience in building and packaging Browser Extensions and/or Electron applications.

• Genuine curiosity and awareness of Generative AI workflows (e.g., prompt engineering concepts, handling streaming AI responses).

• Experience with rich text editing or markdown rendering in React.

NEED TO HAVE :

1) Have some knowledge of front end like React.JS

2) HTML, CSS

3) Strong in JavaScript concepts

4) Good communication skills

5) Loves to code

GOOD TO HAVE :

1) Experience with type script will be a plus

2) Experience with Nest.JS framework will be a plus

3) Strong hold on ES6 principles.

4) Familiar with TDD ( Test Driven Development ) will be a plus.

5) Familiar with working in CI / CD will be a plus

6) Micro-Service architecture knowledge will be an added benefit.

You can contact me on this WhatsApp number: Nine three one six one two zero one three two

Job Description – Senior Full Stack / Frontend Engineer

Position: Senior Full Stack / Frontend Engineer

Experience: 6+ Years

Shift Timing: 2:00 PM – 12:00 AM

Work Mode: WFO(Bangalore)

Notice Period : 0 to 15 Days.

Job Summary

We are looking for an experienced Senior Full Stack / Frontend Engineer with strong expertise in React.js, Next.js, Node.js, Microfrontends, Webpack, Git, and Bitbucket. The candidate should have hands-on experience building scalable, high-performance applications and working with tier-based service architectures.

Key Responsibilities

• Develop and maintain scalable web applications using React.js and Next.js.
• Build reusable and maintainable React components using Hooks, state management, and modern React patterns.
• Optimize application performance, rendering, and component lifecycle.
• Develop applications using Next.js SSR, SSG, ISR, App Router, Server Components, and Client Components.
• Develop and integrate REST APIs using Node.js and Express.
• Work with Node.js event loop, asynchronous programming, async/await, and authentication mechanisms.
• Design and implement Microfrontend architectures using Module Federation.
• Handle communication between independently deployed microfrontends.
• Work on deployment strategies for microfrontend applications.
• Configure and maintain Webpack for bundling, loaders, plugins, code splitting, and Module Federation.
• Follow Git/Bitbucket branching strategies and manage merge/rebase operations.
• Resolve merge conflicts and participate in Pull Request (PR) reviews.
• Work with Bitbucket Pipelines for CI/CD processes.
• Develop applications following a tier-based architecture: UI → API → Service/Business Layer → Database.
• Collaborate with developers, QA engineers, architects, and other stakeholders.
• Troubleshoot technical issues and ensure application reliability, scalability, and performance.

Required Technical Skills

• React.jsHooks
• State Management
• Performance Optimization
• Component Lifecycle
• Next.jsSSR
• SSG
• ISR
• App Router
• Server Components
• Client Components
• API Routes
• Node.jsEvent Loop
• Async/Await
• REST APIs
• Express.js
• Authentication
• MicrofrontendsMicrofrontend Architecture
• Module Federation
• Application Communication
• Independent Deployment
• WebpackBundling
• Loaders
• Plugins
• Code Splitting
• Module Federation
• Version Control & CI/CDGit
• Bitbucket
• Branching Strategies
• Merge/Rebase
• Conflict Resolution
• Pull Requests
• Bitbucket Pipelines
• ArchitectureTier-Based Services
• UI Layer
• API Layer
• Service/Business Layer
• Database Layer

Preferred Candidate Profile

• 6+ years of experience in frontend/full-stack development.
• Strong hands-on experience with React.js, Next.js, and Node.js.
• Good understanding of modern frontend architecture and Microfrontends.
• Strong debugging and problem-solving skills.
• Experience working in Agile/Scrum development environments.
• Good communication and collaboration skills.
• Willingness to work in the 2:00 PM – 12:00 AM shift. 

AI Agent Frameworks, LangChain, LlamaIndex, OpenAI API,Zapier, HTML5, CSS3, JavaScript,bootstrap3.1,TypeScript, React.js, Next.js, Vue.js, Node.js, Python, PHP, WordPress, Headless CMS, DNS Management, SSL Configuration, Conversion Rate Optimization (CRO), A/B Testing, AWS, Google Cloud Platform (GCP), Cloudflare CDN, AWS S3, Core Web Vitals, Google Trends, Google Search Console, Ahrefs, SEMrush, Google Analytics 4 (GA4), Google Tag Manager (GTM), Meta WhatsApp Cloud API, Twilio, Webhooks, MSG91, REST APIs,claude,github,MYSQL

Role Summary

The Senior Front-end Developer builds and maintains client-facing interfaces per UI/UX designs and product requirements, owns front-end architecture and code-review standards, and mentors the Junior Front-end Developer. This is a specialized front-end role, not a full-stack position.

Key Responsibilities

•   Own front-end architecture decisions, including framework, state management, and tooling choices.

•   Set and enforce code-review, testing, and performance/accessibility standards for the pod.

•   Lead implementation of complex, high-visibility features.

•   Troubleshoot and resolve complex front-end performance or technical issues.

•   Mentor the Junior Front-end Developer, including code review and skill development.

•   Partner closely with UI/UX to ensure design fidelity and flag implementation constraints early.

•   Evaluate and recommend front-end tooling or library upgrades.

Required Skills & Technical Competencies

•   Deep expertise in a modern front-end framework (React strongly preferred) and associated ecosystem.

•   Strong understanding of front-end performance optimization and accessibility standards.

•   Experience owning front-end architecture for a production application.

Targeted Qualifications

•   5–8 years of front-end development experience.

•   Deep expertise in a modern framework (React preferred) and front-end architecture patterns.

•   Experience owning performance and accessibility standards.

•   Bachelor's degree in Computer Science or related field.

Preferred / Nice-to-Have

•   Experience with data-dense or real-time dashboard interfaces (relevant to IoT products).

•   Experience mentoring junior developers formally.