Android 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.

• Minimum 3yrs of exp in building React native apps for android and iOS
• Solid understanding of iOS and Android ecosystems.
• Must have worked on hardware integration with the apps.
• Understanding of various navigation models in mobile apps
• Good at debugging, testing, performance optimization.
• Interpersonal skills: good team player, ready to take challenges ability to deliver in a fast-paced environment.

• 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.

Technical Experience:

-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

-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

-Familiarity with the use of additional sensors, such as gyroscopes and accelerometers

-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 Googles Android design principles and interface guidelines

-Proficient understanding of code versioning tools, such as Git

Responsibilities:

● Design and build advanced applications for the Android platform

● Collaborate with cross-team (developers, designers, product owners, QA) to define,

design, and ship new features.

● Prepare test plans, and test cases and execute/automate them.

● Write and review unit-test code for robustness, including edge cases, usability, and

general reliability

● Problem solve and determine out-of-the-box solutions for complex technical

requirements

● Work with fellow programmers, as well as the rest of the production team, as a lead

programmer and manager.

● Must have very strong problem-solving and analytical skills.

● Application of experience and knowledge to optimise game engine deployment for

virtual reality VR in terms of memory, frame rate and performance.

● Work with emerging technologies to create new tools and systems for interactive

real-time production.

● Ensure compliance with ride requirements, including performance benchmarks and

integration with third-party ride control systems.

● Produce clean, well-documented code and maintain internal engine builds, using

Perforce and other tools to distribute builds to the team.

● End-to-End mobile development life cycle from planning to publishing

Requirements:

● B.Tech/B.E degree in Computer Science, Engineering or a related subject

● Proven software development experience and Android skills development

● Proven working experience in Android app development and have published at least

one original Android app

● Experience with Android SDK

● Experience working with remote data via REST and JSON

● Experience with third-party libraries and APIs

● Working knowledge of the general mobile landscape, architectures, trends, and

emerging technologies

● Experienced in handling both legacy code and greenfield development and can make

technical recommendations based on the needs of the project

● Solid understanding of the full mobile development life cycle.

● Expert-level understanding of object-oriented programming, threading/concurrency,

unit testing, and modern architectural design

● Excellent source control discipline and are comfortable using git flow

● Experience in 3D engine development experience within the games industry is a plus

● Hands-on with Jetpack compose is a plus.

● Scrum, agile process and adherence

● Good project management skills are a plus

● Strong expertise in Kotlin and Java

● Knowledge of Swift and Fuller is a plus

Responsibilities:

• Design and build advanced hybrid mobile applications using React Native
• Lead the application development effort by being the SPOC
• Build hybrid apps using React Native for Android/iOS
• Publish apps to corresponding App store/Play store
• Implement new technologies to maximize application performance and optimize load time
• Collaborate with the back-end developer to build the RESTful APIs
• Research on emerging technologies and trends
• Participate in the planning and design of future software and technical architectures

Qualifications

• 3+ years of hands on experience in the full life cycle of Hybrid mobile application development including publishing one or more apps to the play store & app store
• Must have developed Hybrid Mobile application using React. Hands on Working experience of React Native is a must.
• Experience developing back-end services preferably with NodeJS.
• Experience in developing apps on native Android/iOS platforms is a plus
• Experience in designing and working with n-tier architectures (UI, Business Logic Layer, Data Access Layer) along with some experience with service-oriented architectures (SOA)
• Strong skills in RESTful web services
• Experience with Agile methodologies would be helpful

About the Role

As an Android Developer, you will own the Android app and strive to deliver the best learning experience out there to our learners that upGrad is known for. You will be responsible for developing features, taking those features to production and maintaining the existing code. Innovative nature and pro-active involvement in the product is taken very seriously at upGrad, therefore, a major part of your role would involve thinking about new features and new ways to deliver quality learning experience to our learners

Skills/Experience

1. Minimum 6+ years of hands-on Android development experience.
2. Strong Java and object-oriented concepts.
3. Solid understanding of Android architectural patterns especially MVVM and their importance in scalable software development process.
4. Strong understanding of Android fundamentals.
5. Experience in Android UI creation.
6. Experience of Android Live Data, Kotlin and Constraint layout would be a huge plus point.

Years of Exp –  Minimum 6-8 

Mobile App Development:-

We are looking for 2 - 3 years of overall mobile app development experience out of which experience of at least 2+ years in developing native and hybrid mobile applications Should have handled end-to-end designing, development, testing, and deployment on any native Android/iOS platform.

Hands-on experience with native development will add advantage, Angular 6+ Excellent technical knowledge on HTML5, CSS3, JQuery, JQuery Mobile, AJAX, XML, JSON, Java, Bootstrap, PhoneGap, Angular JS.

Should have working experience in consuming Web Service and REST API.

Experience in Business Object Model implementation data integration with JSON/XML Designing and implementing different analytics interfaces such as charts, graphs etc.

Should have knowledge of App signing, publishing to Play-store and iTunes Well versed with code management like GIT, SVN Should be a team player

Roles and Responsibilities:-

• Develop hybrid mobile applications & deliver across the entire app life cycle concept,
• design, build, deploy, test, release to app stores.
• Work directly with the tech team to conceptualize, build, test, and realize products.
• Test the app on devices and Deploy it on Apple Store & Google Play Store.
• Standardizing the platform and in some cases apps to deliver across multiple brands with minimal duplication of effort and Optimizing performance for the apps.