React Native Developer

Position: Senior React Native Developer (4- 7 years)

Location: Remote (Company in Mumbai)

Company: Big Rattle Technologies Private Limited

Immediate Joiners only.

Summary:

We're looking for a seasoned React Native developer who has shipped production-grade mobile apps on both iOS and Android — ideally in the high-traffic, high-stakes world of e-commerce. You'll own the mobile experience end-to-end: architecture, performance, and flawless UX across devices.

Note: We are looking for a senior expert who has delivered multiple apps that are built from scratch and hosted on Apple Store/ Play Store i.e. e2e lifecycle.

KEY RESPONSIBILITIES

• Design and build scalable React Native apps for both iOS and Android from scratch to App Store / Play Store deployment.
• Architect complex e-commerce flows — product catalogues, cart, checkout, payment gateway integration, and order tracking.
• Optimize app performance: reduce TTI, maintain smooth 60fps animations, and manage memory on low-end devices.
• Integrate REST and GraphQL APIs; manage state with Redux Toolkit, Zustand, or React Query.
• Implement push notifications, deep linking, in-app navigation, and offline-first strategies.
• Write clean, well-tested code; maintain CI/CD pipelines using Fastlane, GitHub Actions, or Bitrise.
• Collaborate with designers, backend engineers, and product managers in Agile sprints.
• Conduct code reviews and mentor junior mobile developers.

Required Skills:

Core Mobile

▸ React Native CLI & Expo

▸ TypeScript

▸ React Navigation v6+

▸ iOS (Swift basics) & Android (Kotlin basics) ▸ Xcode & Android Studio

E-commerce & Integrations

▸ Product / Cart / Checkout flows

▸ Razorpay, Stripe, PayPal SDKs

▸ Wishlist, search UX, filters

▸ Order tracking & delivery status

▸ Push notifications & deep linking

State & Data

▸ Redux Toolkit / Zustand

▸ React Query / SWR

▸ REST & GraphQL APIs

▸ AsyncStorage / MMKV

▸ Firebase Realtime DB / Firestore

DevOps & Tooling

▸ Fastlane & GitHub Actions / Bitrise

▸ Jest (unit) & Detox (E2E)

▸ Firebase Crashlytics & Sentry

▸ Flipper / Reactotron

▸ App Store & Play Store deployments

Nice to Have skills: New Architecture · RN Web · AR try-on · RTL support · Shopify SDK · WCAG · Maps SDK

• React Native New Architecture (JSI / Fabric / TurboModules)
• React Native Web or monorepo setups (Nx, Turborepo)
• AR product try-on experiences (ARKit / ARCore)
• Shopify Storefront API or WooCommerce SDK experience
• Accessibility (WCAG mobile) implementation
• Live order-tracking maps (Google Maps / Mapbox)

Required Qualifications:

• Bachelor’s degree in Computer Science, Engineering, or a related technical field.

Why should you join Big Rattle?

Big Rattle Technologies specializes in AI/ ML Products and Solutions as well as Mobile and Web Application Development. Our clients include Fortune 500 companies. Over the past 13 years, we have delivered multiple projects for international and Indian clients from various industries like FMCG, Banking and Finance, Automobiles, Ecommerce, etc. We also specialise in Product Development for our clients.

Big Rattle Technologies Private Limited is ISO 27001:2022 certified and CyberGRX certified.

What We Offer:

• Opportunity to work on diverse projects for Fortune 500 clients.
• Competitive salary and performance-based growth.
• Dynamic, collaborative, and growth-oriented work environment.
• Direct impact on product quality and client satisfaction.
• 5-day hybrid work week.
• Certification reimbursement.
• Healthcare coverage.

Responsibilities

1. Cross-Platform Mobile Development

• Build, maintain, and scale production-grade React Native applications for both Android and iOS platforms from a single codebase.
• Translate product requirements and UX designs into clean, modular, and reusable React Native components.
• Develop rich, intuitive user interfaces for AI/ML dashboards, real-time analytics, and consumer-facing applications.
• Own features end-to-end — from technical design through to deployment on Play Store and App Store.

2. Native Integration & Bridging

• Write custom native modules and bridges in Kotlin/Java (Android) or Swift/Objective-C (iOS) to extend React Native's capabilities where required.
• Integrate third-party SDKs, device hardware APIs, and platform-specific features seamlessly into the React Native layer.
• Ensure consistent functionality and behaviour across a wide range of Android and iOS devices and OS versions.

3. Real-Time & Data-Driven UI

• Build real-time UI components that handle live data streams, WebSocket connections, and high-frequency data updates with minimal latency.
• Develop data-intensive views including charts, dashboards, and monitoring interfaces optimised for mobile performance.
• Ensure smooth, responsive user experiences under high-traffic and data-heavy conditions.

4. Performance & Optimization

• Profile, debug, and optimize application performance using tools such as Flipper, Hermes, React DevTools, and platform-native profilers.
• Minimize app bundle size, reduce render cycles, and improve startup time through best-in-class optimization techniques.
• Ensure accessibility compliance and cross-device UI consistency across varying screen sizes and resolutions.

5. Architecture & Code Quality

• Design and implement scalable mobile architectures supporting modularity, testability, and long-term maintainability.
• Implement robust state management using Redux, Zustand, MobX, or React Context depending on application complexity.
• Establish and uphold mobile coding standards, component libraries, and reusable design systems across the team.

6. Collaboration & Delivery

• Partner closely with backend, AI/ML, data engineering, and design teams to integrate APIs, data pipelines, and workflows.
• Actively participate in code reviews, sprint ceremonies, and technical design discussions.
• Support CI/CD pipelines using Fastlane, Bitrise, or equivalent tools for automated builds and releases.
• Contribute to OTA update strategies using CodePush or equivalent.

Required Skills & Qualifications

• Strong hands-on experience building and shipping production React Native applications on both Android and iOS.
• Proficiency in JavaScript and TypeScript — TypeScript strongly preferred.
• Experience with state management libraries — Redux, Zustand, MobX, or Context API.
• Solid understanding of React Native architecture — Bridge, JSI, Hermes engine, and the New Architecture (Fabric/TurboModules) is a plus.
• Experience writing native modules or bridges in either Kotlin/Java or Swift/Objective-C.
• Hands-on experience with REST APIs, GraphQL, and WebSockets in a mobile context.
• Strong understanding of mobile UI/UX principles, responsive design, and platform-specific design guidelines (Material Design & HIG).
• Experience with CI/CD pipelines and app store deployment processes.

Preferred Skills

• Experience building data-intensive or dashboard-heavy mobile applications.
• Familiarity with data visualization libraries such as Victory Native, Recharts, or D3.js for mobile.
• Exposure to AR/VR or graphics-intensive mobile experiences (ARKit, ARCore, React Native Vision Camera).
• Experience with OTA updates via CodePush or similar tools.
• Familiarity with monorepo setups (Nx, Turborepo) for managing shared mobile codebases.
• Understanding of accessibility standards (WCAG) and inclusive design on mobile.
• Exposure to AI/ML integration on mobile — on-device inference, TensorFlow Lite, or CoreML.

• Building user-friendly IOS and Android apps on React Native Platfrom.
• proficient in Coding debugging.
• Collaborate with cross - functional terms to define and design new features .
• Work on bug fixing and improving applications performance.
• Hands on experience in optimizing code for application performance.
• Ability to deliver projects on time by satisfying clients needs .
• Wiriting modular , resuable, maintainable , well documented and fully tested code.

Job Description-

We are looking for a React Native Lead interested in building performant mobile apps on both the iOS and Android platforms. You will be responsible for architecting and building these applications, as well as coordinating with the teams responsible for other layers of the product infrastructure. Building a product is a highly collaborative effort, and as such, a strong team player with a commitment to perfection is required.

Responsibilities

Build pixel-perfect, buttery smooth UIs across both mobile platforms. Leverage native APIs for deep integrations with both platforms. Diagnose and fix bugs and performance bottlenecks for performance that feels native. Reach out to the open source community to encourage and help implement mission-critical software fixes—React Native moves fast and often breaks things. Maintain code and write automated tests to ensure the product is of the highest quality. Transition existing React web apps to React Native.

Skills

Firm grasp of the JavaScript {​{​and TypeScript or ClojureScript}​}​ language and its nuances, including ES6+ syntax Knowledge of {​{​functional or object-oriented}​}​ programming Ability to write well-documented, clean Javascript code Rock solid at working with third-party dependencies and debugging dependency conflicts Familiarity with native build tools, like XCode, Gradle {​{​Android Studio, IntelliJ}​}​ Understanding of REST APIs, the document request model, and offline storage Experience with automated testing suites, like {​{​Jest or Mocha}​}​

• Create and maintain mobile applications.
• Contributing to the development of project schedules and workflows.
• Recommending changes and enhancements to applications.
• Work from UI/UX requirements, APIs and mock-ups to build functional and high-performance applications.
• Keep abreast of the latest technology for mobile applications.
• Work with other developers to brainstorm new applications.
• Create UI tests to source analytics.

Benefits

We pay top salaries with lucrative esops options.

Opportunity to work and learn with very mature, helpful and highly motivated techies.

Our environment is vibrant and full of energy. We are looking for like-minded people who love to “code” and have passion in building great software.

Flexible timings.

Quarterly parties

Rewards and Recognitions

Unlimited Leaves

Flexibility to work remotely

Flexibility to work from Gurgaon or Bangalore Office

Half yearly review cycle

React Native Lead. We want you to have a chat with the candidates whether they are good on these points and do they have the experience as per mentioned in JD. It will be beneficial for us to filter out profiles for RN Lead.

Job Description / what you'll be doing

• Leading the team to build cutting edge React Native applications.
• Architects build and maintain excellent applications with clean code.
• Implement pixel-perfect UI's that match designs. Knowledge of scalable sizing of UI is a must.
• Implement clean, modern, smooth animations and transitions that provide an excellent user experience.
• Integrate third-party APIs.
• Write unit and integration test cases.
• Release applications to IOS and Google Play stores.
• Must understand iOS and Android native code which can be used to write bridges.
• Can work in pod structure. 
• Must be comfortable in the SCRUM process. Complete two-week sprints and participate in sprint retrospectives and daily standups.
• Assist with building estimates and pipeline for tasks rollout.
• Good communication and people skillset.
• Work with modern tools including Jira, Slack, GitHub, Firebase, GTM, Google play console, AppStore Connect, etc.
• Be part of a community of developers who share knowledge and help each other as problems arise.
• Ability to work through new and difficult issues and contribute to libraries as needed.
• Ability to create and maintain continuous integration and delivery of applications.
• Must be familiar with profiling and performance monitoring of the application.
• Ability to achieve stretch goals in a highly innovative and fast-paced environment

Requirements

• 6+ years of professional experience working with Mobile application development and 2-4+ years of experience with React Native development.
• Experience working with Swift / ObjectiveC, Java / Kotlin required.
• Should have a crystal understanding of App architecture and how to React interacts with the native layers for iOS and Android respectively
• Excellent JavaScript Developer has a deep understanding of scope and closures, ES6, Object prototypes, Async, Hooks, Functional components, and Performance
• Excellent Code reviewer and champion at writing unit test cases
• Should be able to evaluate alternative multiple system designs and solutions and make data-backed decisions in his/her approach
• Meaningful experience working on large, complex systems.
• Ability to take over your work. Every day is a challenge to ensure you are performing to the expectations you and your team have agreed upon, both in regards to estimates and to the general process. extreme ownership
• An understanding of best practices and a commitment to following them.
• A positive mindset and can-do attitude.
• Forensic attention to detail.
• Mentoring, onboarding, and interviewing the candidate
• Experience mentoring junior software engineers to improve their skills and make them more effective product software engineers
• Experience influencing software engineers- best practices within your team
• Passion to design and develop intuitive user interface
• Sound business judgment, proven ability to influence others, and strong analytical thinking skills
• You work well within a team environment and enjoy working in the office with your colleagues.

• Relevant experience in building a mobile application using React Native.
• Your primary focus will be on developing user interface components for mobile and implementing them following well-known React workflows. (such as Flux or Redux)
• You will ensure that these components and the overall application are robust and easy to maintain. 
• You will be coordinating with the rest of the team working on different layers of the infrastructure. 
• Should have published at least 2 live hybrid mobile applications. 
• Good understanding of Android / iOS / Web design guidelines, SDK and excellent JavaScript skills. 
• Expertise in RESTful APIs development. 
• Expertise with code testing best practices, including unit and integration testing to ensure a quality of code. 
• Familiarity with code versioning tools such as Git, TFS and Agile/SCRUM Development methodologies