UI 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.

KEY RESPONSIBILITIES WILL INCLUDE:

• Participating in the entire product lifecycle (analyze, develop, test, release, and support.
• Contributing to research for new web and mobile technologies and recommend solutions to improve interface designs and interactions
• Testing, debugging, and fine-tuning to optimize the application’s performance.
• Designing intuitive applications to enhance users’ experiences.

DESIRED SKILLS AND EXPERIENCES:

• 2+ year experiences of mobile/web application development and system integration.
• Must be a skilled programmer with knowledge of coding best practices and ability to produce highly readable and maintainable code.
• Management and support of Google Play Store and Apple App Store.
• Experience in API development and integration with third-party APIs
• English communication is required. Great communication skills to coordinate across technical teams and business stakeholders.
• Creative, detail-oriented, and with good problem-solving skills
• Ability to collaborate with and lead other development team members.
• Ability to work in multiple projects and thrive in a fast-paced environment
• Candidate must possess at least a bachelor's degree or Post Graduate Diploma in Computer Science/Information Technology or equivalent.
• Specialization in IONIC must.

KNOWLEDGE OR EXPERTISE IN THE FOLLOWING ARE AN ADVANTAGE:

• Specialization in HTML5, CSS3, jQuery, and JavaScript.
• Experience with web service integration (REST, JSON, XML).
• Experience or knowledge with Git, Gitlab, GitHub is a plus.

We are looking for a Senior React Native developer with 5 - 6 years of experience, in building performant mobile applications on Android & iOS platforms. You will be responsible to Architect, build React Native applications.

We are a fast growing product based startup operating out of Chennai.

Responsibilities

• Build pixel-perfect, buttery smooth UIs across Android and iOS.
• Technical design of complex mobile applications
• Leverage native APIs for deep integrations with both platforms.
• Translating designs and wire-frames into high quality code
• 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

• 5-6 years of demonstrable experience in designing and developing mobile apps using react-native.
• 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 and Visual Studio Code.
• Understanding of REST APIs, the document request model, and offline storage.

Below are a few perks of joining our team:

• Competitive salary
• Fully remote job
• Creative Problem Solving and Entrepreneurial Thinking
• Fast-Paced Environment
• Consistent Engagement from Senior Leadership

Flutter Developers [I/E2-JM2]

We are looking for Flutter developers responsible for the development and maintenance of applications aimed at a range of Mobile and Desktop. You will be working alongside other engineers and developers working on different layers of the infrastructure.

Responsibilities:-

Design and build advanced applications for the IOS/Android/Web and desktop platform

Maintain quality and ensure responsiveness of applications.

Collaborate with the rest of the engineering team to design and launch new features.

Collaborate with cross-functional teams to define, design.

Work with outside data sources and APIs

Unit-test code for robustness.

Work on bug fixing and improving application performance

Maintain code integrity and organization.

Help maintain code quality, organization, and automation.

Identify and correct bottlenecks and fix bugs

Requirements:-

Very good understanding of Flutter framework at-least 2+ year of experience in Flutter based application development.  

Hands-on experience on Flutter APIs, Dart

Experience with offline storage, threading, and performance tuning.  

Hands-on experience on iOS or Android. 

Good exposure to various 3rd party Integrations(Firebase, Google Map, Payment gateways).

Thorough understanding of Flutter development tools.  

Familiarity with RESTful APIs development.  

Expertise with code testing best practices, including unit and integration testing to ensure quality of code.  

Familiarity with code versioning tools such as Git. 

Strong understanding of Flutter Apps architecture BLoC or, Provider. , Unit testing, Streames

Good understanding of Isolates

Good understanding of Method channels, Event channels

Basic understanding of C++ and python

Experience Required : 4 to 7 yr

Immediate joiner preferred

• Proven software development experience
• Proven working experience in Android
• Strong Java OOPs concepts and design patterns understanding 
• Hands-on experience on Kotlin.
• Good understanding of C and data structures, JavaScript
• Must have a good understanding of React Native or Cordova
• Strong knowledge of Android SDK, different versions of Android, and how to deal with different screen sizes
• Have published at least one app in the Store.
• Experience in writing SDK frameworks
• Experience working with remote data via REST and JSON
• Strong knowledge of Android UI design principles, patterns, and best practices
• Experience with third-party libraries and APIs
• Knowledge of JNI, security algorithms
• Experience with offline storage, threading, and performance tuning
• Ability to design applications around natural user interfaces
• Knowledge of the open-source Android/iOS ecosystem and the libraries available for common tasks
• Must be proficient in code versioning tools such as Git, SVN
• Working knowledge of the general mobile landscape, architectures, trends, and emerging technologies Solid understanding of the mobile development life cycle
• Good to have: Experience in working on cross-platform such as Flutter, Kony.

Responsibilities

- Translate designs and wireframes into high quality code

- Design, build, and maintain high performance, reusable, and reliable Java code

- Ensure the best possible performance, quality, and responsiveness of the application

- Identify and correct bottlenecks and fix bugs

- Help maintain code quality, organization, and automatization

Skills

- Strong knowledge of Android SDK, different versions of Android, and how to deal with different screen sizes

- Familiarity with RESTful APIs to connect Android applications to back-end services

- Strong knowledge of Android UI design principles, patterns, and best practices

- Experience with offline storage, threading, and performance tuning

- Ability to design applications around natural user interfaces, such as “touch”

- Knowledge of the open-source Android ecosystem and the libraries available for common

tasks

- Ability to understand business requirements and translate them into technical requirements

- Familiarity with cloud message APIs and push notifications

- A knack for benchmarking and optimization

- Understanding of Google’s Android design principles and interface guidelines

- Proficient understanding of code versioning tools, such as Git

Job Description Responsibilities:

• Design and build mobile applications using React Native

• Build native component for iOS (Native experience would be plus) or Android

• Collaborate closely with the Team lead to understanding the requirement and implementation details.

• integration with third-party APIs.

Required Skills:

• 2yrs experience in React-Native based app development is a must.

• Must have published at least 1 major React-Native app

• Knows how to embed React-Native in a native(iOS/Android) component and vice versa

• Strong focus on app performance.

At Navi, our mission is to build financial services that are simple, accessible and affordable.

Navi is founded by Sachin Bansal & Ankit Agarwal to build consumer-centric and technology-driven businesses in the BFSI (Banking, Financial Services & Insurance) space.

Responsibilities:

• Work on the development of the Android app for our first product
• Write clean, well-tested code
• Optimise app performance using real profiling data

Requirements:

• 3+ years of software development experience
• Strong computer science fundamentals
• Deep knowledge of Java and Android SDKs, familiarity with Kotlin
• Can write code that is readable, maintainable and testable
• Know the importance of tests and how to approach writing different types of tests

Bonus:

• Know how to use test driven development as a design tool
• Seek to identify key underlying ideas and use those as building blocks before reaching for shiny new tools