
Participate and contribute in design and development of the core components of the serviceto
Ensure high quality of software development with respect to architecture, code quality, testing and development
Implement testing frameworks and disciplines as part of every feature development
Own performance of app in production and implement / push for implementation of systems to monitor, debug and fix an issue in production in lowest TAT
Requirements
Who thrives in building applications at ease and speed and optimize the time and effort to build an application
Has good experience in building android applications
Experience with flutter eco system is a great plus
Who likes to think in terms of software and data architecture before opening android studio
Comfortable with managing development and deployment of applications
Open and more importantly excited about learning new technologies

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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.
•Should know about OOPS Concept, Core java, and basic Android
•Able to Design, Develop, Test & Implement an Android Application
•Basic knowledge of Javascript, Jquery gets a chance to work on React Native.
•Understanding of Linux/Ubuntu, Web servers, Cross Browser compatibility.
•Strong knowledge of UI development.
•Knowledge of 3rd party APIs implementation, while iOS & Android app development is good.
Roles & Responsibilities:
- Work as part of a team to build React Native iOS / Android applications for Full Stack's clients.
- Architect, build and maintain excellent React Native applications with clean code.
- Implement pixel perfect UI's that match designs.
- Implement clean, modern, smooth animations and transitions that provide an excellent user
experience.
- Integrate third-party API's.
- Write unit and integration tests.
- Release applications to the Apple and Google Play stores.
- Work with native modules when required. - Interface with clients via Zoom, email, etc.
- Work with modern tools including Jira, Slack, GitHub, Google Docs, etc.
- Be part of a community of React Native developers who share knowledge and help each other as problems arise.
- Follow Full Stack's detailed development process.
Requirements:
- 2+ years of professional experience working with React Native. - 3+ years of professional software development experience.
-- Meaningful experience working on large, complex systems.
- Ability to take extreme ownership 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.
- Ability to identify with the goals of Full Stack clients and dedicate yourself to delivering on the
commitments you and your team make to them.
- An understanding of React Native best practices and a commitment to following them.
- Ability to work through new and difficult React Native issues and contribute to libraries as needed.
- Ability to create and maintain continuous integration and delivery of React Native applications.
- A positive mindset and can-do attitude.
- Forensic attention to detail.
- English skills (ability to effectively communicate via written and spoken English).
- A passion for software development. It's not just your career, it's also your hobby. You're constantly striving to learn new things and improve. You follow industry news, regularly tinker with new technologies, and read books and blogs to keep your skills current.
- You work well within a team environment and enjoy working in the office with your colleagues.
Job Description :
- Number of years 4 to 5+
- Good in JAVA / Kotlin/ OO programming
- Strong grasp of Android SDK and lifecycle
- Strong Android programming and debugging skills
- Good in multi-threading and concurrency
- Strong in Android UI development
- Well-versed in Android app testing
- Problem/puzzle-solving skills
- Automation test frameworks like UI Automator, Expresso, APPIUM, etc.
- Database/ GreenDAO/ SQLLite
- Network Communications experience on Android is highly desired
- QR/ Barcode Reader
- Experience generating reports
- Security permissions, etc.
- Meeting with the product team to discuss ideas and specifications.
- Establishing strategy and development pipelines.
- Planning and implementing native functionality.
- Transforming design ideas into functional code.
- Designing and building native plugin codes.
- Identifying and fixing code errors and native plugin bottlenecks.
- Ensuring products conform to high industry standards.
Founded in 2015 by a CII member and serial entrepreneur, our client is democratizing and digitizing the Indian health & fitness ecosystem by offering workouts close to your home, office or your favorite neighborhood.
As a Android Developer- Java, you will be responsible for conceptualizing, designing and building advanced application for the Android platform.
What you will do:
- Collaborating with cross-functional teams to define, design, and ship new features
- Unit-test coding for robustness, including edge cases, usability, and general reliability
- Bug fixing
- Improving application performance, optimization for loading times
- Continuously discovering, evaluating and implementing new technologies to maximize development efficiency
- Conducting Code Reviews
Desired Candidate Profile
What you need to have:- Bachelors/ Master’s degree in Computer Science, Engineering or a related subject
- Minimum 3 years work experience in mobile application development
- Proficiency in Problem Solving, Data Structures and Algorithms
- Strong knowledge of design concepts and constraints on mobile platforms
- Proficiency in Java/Android
- Ability to use third party SDKs
- Familiarity with Firebase, FCM, IMA, Google Services and Facebook SDK
- Demonstrable experience building excellent mobile apps that are currently in Google Play Store
- Experience with HTML5, Java, Responsive Design and flutter
- 4+ years of mobile software development (iOS & Android).
- Bachelor’s Degree in Computer Science, Engineering, or related field.
- Deep understanding and proficiency in building mobile apps from scratch using at least one mobile language (Swift, Java, Objective-C, etc.). Experience with multiple platforms is preferred.
- Desire and ability to expand expertise into additional mobile languages.
- Expertise in designing testable software and building large scale, complex applications.
- Self-motivated with strong problem-solving skills.
- Passionate about writing clean, well organized, and production-ready code.
- A portfolio of Apps or SDKs already built and in the App Store and Google Play.
- Desire to build a larger in-house team and manage a group of developers over time.
- Some management experience preferred.
The positon Requires you to be highly skilled and Know what you do, as Your Product will be consumer facing App.
The Roles Will be as of the following.\
- Support the entire application lifecycle (concept, design, test, release and support)
- Produce fully functional mobile applications writing clean code
- Gather specific requirements and suggest solutions
- Write unit and UI tests to identify malfunctions
- Troubleshoot and debug to optimize performance
- Design interfaces to improve user experience
- Liaise with Product development team to plan new features
- Ensure new and legacy applications meet quality standards
- Research and suggest new mobile products, applications and protocols
- Stay up-to-date with new technology trends






