React Native
Android Development
iOS App DevelopmentThe thrill of working at a start-up that is starting to scale massively is something else. Simpl (FinTech startup of the year - 2020) was formed in 2015 by Nitya Sharma, an investment banker from Wall Street and Chaitra Chidanand, a tech executive from the Valley, when they teamed up with a very clear mission - to make money simple, so that people can live well and do amazing things. Simpl is the payment platform for the mobile-first world, and we’re backed by some of the best names in fintech globally (folks who have invested in Visa, Square and Transferwise), and
has Joe Saunders, Ex Chairman and CEO of Visa as a board member.
Everyone at Simpl is an internal entrepreneur who is given a lot of bandwidth and resources to create the next breakthrough towards the long term vision of “making money Simpl”. Our first product is a payment platform that lets people buy instantly, anywhere online, and pay later. In
the background, Simpl uses big data for credit underwriting, risk and fraud modelling, all without any paperwork, and enables Banks and Non-Bank Financial Companies to access a whole new consumer market.
In place of traditional forms of identification and authentication, Simpl integrates deeply into merchant apps via SDKs and APIs. This allows for more sophisticated forms of authentication that take full advantage of smartphone data and processing power.
We are looking for an experienced (>4 years) mobile developer who is proficient with Android/iOS platforms along with exposure to React Native. You should have a sense of great ‘taste’ and be excited about building products with exceptional UX. You should be able to implement established best practices across the mobile platform including automation testing, continuous integration, and architectural patterns.
Responsibilities
1. Developing new user-facing features using Android/iOS and React Native
2. Building reusable and platform specific components
3. Translating designs and wireframes into high-quality code
4. Optimizing components for maximum performance on Android and iOS
5. Brainstorm with designers & product managers to come up with product features
Requirements
1. Strong proficiency in tech stack (Java for Android developers & Swift, Objective-C for iOS
developers)
2. Thorough understanding of React Native and its core principles
3. Experience with popular React Native workflows (for Routing, State container, etc)
4. Experience with Native modules, bridging native code with React Native
5. Familiarity with newer specifications of ECMAScript
6. Experience with developing SDKs for Android or iOS platform is a plus
7. Familiarity with RESTful APIs
8. Familiarity with build pipelines and tools for mobile platforms
9. A knack for benchmarking and optimization
Shubham Vishwakarma
Full Stack Developer - Averlon
About Simpl
About
Simpl has revolutionized online checkout in India by creating a Pay-Later platform, empowering e-commerce merchants to offer their consumers a 1-click checkout, a line of credit at POS, and full buyer protection. It aims to empower merchants to own their customer's checkout experience. With Simpl merchants are able to provide consumers with an easy, safe, and intuitive user experience that builds a trusted relationship between the two.
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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.
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Proficiency with React Native.
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Experience and Understanding of ES6 & JavaScript Concepts.
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Experience with React.js and Redux.
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Familiarity with native build tools, like XCode, Gradle Android Studio, IntelliJ
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Hands-on experience on Android, iOS platforms in creating Hybrid / Native applications.
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Has prior experience in creating bridging modules for React Native
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Understanding of the basic concepts of Android and iOS like Services, Background App Refresh, offline compatibility etc
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Hands on experience in Application Design and Development on React Native platform.
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Require knowledge of Version Control GIT.
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Understanding of Unit Testing, Debugging Methodology used in React Native Apps
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- Monthly Rewards and Recognition Program- Star Performer of the Month.
- Work-Life Balance.
- Fantastic Team Spirit with Creative, Fun and Open Office Work Culture.
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Full Stack Developer - Averlon