Mobile 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.

JOB DESCRIPTION: 

-Firm grasp of the JavaScript language and its nuances, including ES6+ syntax  

-Build pixel-perfect, 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  

-Knowledge of functional and object-oriented programming 

-Strong knowledge and experience in either iOS or Android native application development  

-Familiarity with native build tools, like XCode, Android Studio  

Job Description

• Build pixel-perfect, buttery smooth UIs
• Leverage native APIs for deep integrations
• Diagnose and fix bugs and performance bottlenecks for performance that feels native.
• Maintain code and write automated tests to ensure the product is of the highest quality

Requirements

• 2+ years of relevant industry experience in React Native
• A deep understanding of JavaScript
• Familiarity with video recording, playback, and uploading libraries
• Experience with Native Android app deployment
• Familiarity with modern front-end build pipelines and tools
• Familiarity with RESTful APIs
• Familiarity with code versioning tools (such as Git)

React Native Application Developer

Job Description

•       As a React Native Developer, your responsibility will include creating a suite of applications and improving the functions of applications in development.
•       Experience in building a React or Native mobile app with traffic at scale
•       Ability to architect, refractor and debug an app without disrupting users
•       Proficient with mobile application life cycles
•       Should have multiple apps deployed to the App Store, Google Play Store and deep knowledge of the distribution processes
•       Understanding of unit and functional testing best practices.
•       Should be able to dive into the source code of front end libraries to debug, patch and extend them when necessary
•       Can take a defined software design and turn it into code.
•       Understands how to optimize the delivery of code and assets (e.g., images, fonts) to a browser or device (e.g., lazy loading assets, using CDNs, caching, compression, etc.).
•       Experience with React Js, React Native, JavaScript including DOM Manipulation and the JavaScript object model. Exp with integrated JSON is a must.
•       Thorough understanding of React Native and its core Principles. Hands-on experience on React Native Framework at least 2 Years.

What you will do

•       Working collaboratively in building products and services.
•       Designing mobile-based features, impacting Customer's Digital Experience
•       Taking ownership of the entire software development lifecycle for mobile application
•       Collaborating with cross-functional teams to define design and add new features
•       Ensuring the performance, quality and responsiveness of the applications.
•       Understanding end-user requirements and use cases and translating them into a pragmatic and effective technical solution

Required Candidate profile

•       Capability to perform both independently and in a team
•       Ideal Candidate - Must be open to work on new technologies, versatile and capable of accepting new challenges.
•       Good Knowledge of HTML5, CSS

1. Build pixel-perfect UIs across Android and iOS mobile platforms.
2. Leverage native APIs for deep integrations with both platforms. 
3. Diagnose and fix bugs and performance bottlenecks for performance that feels native. 
4. Developing and releasing complex, data-driven apps using React Native as the primary application framework. 
5. Proficiency writing Modern JavaScript, including ES6+, and JSX.
6. Maintain code and write automated tests to ensure the product is of the highest quality.
7. Must be able to develop high-performance cross-platform apps using React-Native.

• You will work on long-term React Native mobile applications for innovative startups.
• Together with your colleagues and our clients you will analyse requirements and envision a qualitative solution. You will be responsible for the entire development - from architecture to implementation - and deliver user-friendly, performant and well-tested mobile applications.
• You will be part of our continuous improvement culture, hone your skills and share your experience with your colleagues.

• You have at least 3-year experience implementing and deploying React Native apps.
• You developed and published at least one React Native app on Google and Apple Store.
• You are familiar with Google and Apple Store guidelines and compliance.
• You can build pixel-perfect UIs for all mobile platforms.
• You have strong knowledge of Javascript ES6 and higher.
• You know how to make a solid relational data model and have a good knowledge of SQL.
• You have integrated a variety of web API's and understand HTTP.
• You know how to write clean and flexible object-oriented code.
• You have a good understanding of async programming concepts.
• You work daily with tools like Git, NPM and a proper IDE (Webstorm).
• You can deliver POCs, experiments and technology evaluations following design thinking practices.
• You will be contributing towards architecting and building React Native applications, as well as coordinating with the teams responsible for other layers of the product/project infrastructure.
• You write clean code and are a pragmatic programmer.

• You wish Typescript was the default language of the web.
• You stepped outside the Expo world and have experience with native iOS or Android development. You are familiar with XCode and Android studio, and leverage native APIs for deep integration with Android and iOS.
• You have experience with state management libraries like MobX and Redux.
• You write automated tests and perform end-to-end testing with Detox or Appium.
• You are familiar with functional programming concepts and apply it occasionally.
• You worked with other hybrid mobile platforms like Sencha, HTML5, PhoneGap, etc.
• You have experience with Scrum and Lean methodology