Mobile Application - Sr. Developer

What this role is

The market has no shortage of mobile developers who only do mobile, and no shortage of full-stack engineers who have never shipped a production app. This role is neither of those.

You are a Product Engineer whose centre of gravity is mobile. React Native is where you live. You have shipped apps, debugged native integrations, handled platform-specific edge cases, and understand what it actually takes to get something through App Store and Play Store review. That is the non-negotiable foundation.

But at Fountane, Product Engineers build products — not layers. The same feature that lives in a mobile app often has a web surface, an API, a webhook, or a database schema behind it. At L3 you are expected to own the full application surface of what you are building, not hand off the moment the work touches a backend. You will not be doing everything alone — you have a pod. But you will need to be capable of crossing the boundary when the work demands it.

You are joining a permanent Island pod. Your first deployment is to an ongoing client engagement that requires your mobile depth immediately. After that, you are a long-term Islander who will move across engagements as the Mainland deploys you.

What Fountane is actually asking for

We know the market has specialists. We are not pretending this is a standard full-stack role with mobile as a footnote, or a mobile role where full-stack is irrelevant. Mobile is your primary skill. Everything else is your secondary obligation. If you have spent your career going deep on React Native and can hold your own on an API or a web feature when needed, this role fits you.

If you are a pure mobile specialist who cannot — or will not — touch anything outside the app layer, this is not the right fit. Not because we do not respect specialisation, but because Islands do not have room for hard walls between disciplines. The work crosses boundaries. So must you.

What you will own at L3

• React Native application development — the primary mobile codebase, feature delivery, and platform-specific implementation across iOS and Android
• App Store and Play Store release management — build pipelines, submission, review compliance, and versioning
• Native integrations — push notifications, device permissions, biometrics, deep linking, offline-first patterns, and platform SDK integrations where required
• Context Engineering — translating Concept Engineer prototypes and briefs into a clean, scalable mobile architecture using Cursor as your primary execution tool
• API integration and backend contribution — consuming and, where needed, building or modifying the backend services your mobile surfaces depend on
• State management architecture — owning how data flows through the mobile application, not just implementing patterns handed to you
• Cross-platform consistency — ensuring iOS and Android behaviour is intentional and documented, not accidental
• Cursor .cursorrules contribution — maintaining the Island's mobile-specific coding standards and context files so the codebase stays navigable as it grows
• Refactoring and codebase stabilisation — at L3 you are expected to work safely on an existing codebase, not just greenfield. You use Cursor's codebase context to edit and optimise without breaking what already works
• Mentoring L1 and L2 engineers on the Island — reviewing their code, raising the quality bar, and making sure mobile-specific patterns are being applied correctly across the pod

The technology you will be working with

This role is being hired for a specific active engagement. The following is the technology stack in use on this project. If you have not worked with these directly, do not apply.

• React Native — cross-platform mobile, iOS and Android
• TypeScript and JavaScript (ES6+) — the entire codebase is typed
• State management — Zustand and Redux; you need to know both and have an opinion on when to use each
• API integration — RESTful APIs and GraphQL; you will be consuming both
• Push notifications — Firebase Cloud Messaging (FCM) and Amazon SNS
• List rendering and UI performance — FlatList and related React Native optimisation patterns; this is not optional on a project of this scale
• Git — branching, PR reviews, and version control discipline on a team codebase
• iOS and Android platform guidelines — you understand the design and behavioural expectations of both platforms and implement accordingly

Bonus — useful but not required to apply:

• Native Android (Kotlin/Java) or iOS (Swift/Objective-C) experience
• Mobile testing frameworks — Jest, Detox, React Native Testing Library
• CI/CD pipeline experience for mobile applications
• Performance monitoring and analytics tooling

Proof-based qualifications

We do not assess candidates on years of experience or job titles. We assess on proof of capability. When you apply, be prepared to demonstrate the following:

What we look at

What you must show

2–3 shipped apps

Live applications on the App Store and/or Play Store that you built or were a primary engineer on. Provide links or app names in your application. We will look them up. If you cannot name two shipped apps, do not apply.

React Native + TypeScript

A codebase or feature set demonstrating typed React Native development — components, hooks, context API, and state management using Zustand or Redux. Not a tutorial project.

API and backend integration

A feature where your React Native work connected to a RESTful or GraphQL API — ideally one you also built or modified on the backend side. Show us the integration, not just the consumption.

Cursor-driven workflow

Walk us through how you currently use Cursor and Claude in your build process. Not a demo. A real conversation about how AI tooling has changed how you write and debug code.

A CV listing React Native and a GitHub with no shipped apps is not proof. Show us what you have built.

AI tooling at Fountane

Claude and Cursor are the primary tools for thinking, drafting, and executing work at Fountane. Every Product Engineer — including this one — is expected to use Cursor as their main development environment and Claude for context engineering, debugging, and architectural thinking.

This is not a listed skill. It is the working method. If you are not already building with Cursor and Claude integrated into your daily workflow, you will need to get there fast. The Island's velocity depends on it.

Who should not apply

• You have only built mobile apps backed entirely by third-party services (Firebase, Supabase) and have never touched application logic outside the app layer.
• You cannot name two or more applications you have shipped to the App Store or Play Store.
• You treat mobile as a skin over a web app. You have not handled platform-specific native behaviour, device APIs, or cross-platform edge cases.
• You are not using AI tooling in your current workflow and see it as optional.
• You need a clear boundary around mobile and expect the backend work to always belong to someone else.

What comes next

L3 is not a ceiling. The path to Lead PE — Mobile requires demonstrated ability to orchestrate the Island's full application architecture across mobile and backend, define the .cursorrules for the pod, manage Island velocity, and handle client technical conversations without the Lead CE in the room. Promotion is not tenure-based. It is triggered by demonstrated capability at the next level's complexity tier.

About Fountane

Fountane is a technology ventures lab - one part product studio, one part startup engine. We build high-quality software and AI products for clients ranging from fast-moving startups to large enterprises, and we co-build and invest in new companies when we see the right opportunity.

Founded in 2017 and headquartered in Minneapolis, we have grown to 60+ people across four continents and were recognised as one of America’s fastest-growing companies, ranking No. 699 on the Inc. 5000 with 595% three-year growth.

We are radically open-minded, serious about craft, and direct about expectations. If you want to do meaningful work without politics, this is the place.

Job Profile: React Native Developer (2+ Years Experience)

Location: Kolkata

Work Mode: Work From Office

Experience Required: 2+ Years

Employment Type: Full-Time

Job Description

We are looking for an experienced React Native Developer with 2+ years of hands-on experience to join our mobile development team in Kolkata. The ideal candidate will be responsible for building high-quality, scalable, and performance-optimized mobile applications for Android and iOS platforms.

Key Responsibilities

• Develop and maintain cross-platform mobile applications using React Native
• Convert UI/UX designs into pixel-perfect mobile interfaces
• Integrate RESTful APIs and handle asynchronous data
• Optimize mobile applications for performance, stability, and scalability
• Implement state management using Redux, Context API, or other libraries
• Write clean, maintainable, and reusable code
• Debug, troubleshoot, and resolve production and performance issues
• Collaborate with backend developers, designers, QA, and product teams
• Participate in code reviews, sprint planning, and Agile ceremonies
• Publish and maintain apps on Google Play Store and Apple App Store

Required Skills & Qualifications

• 3+ years of experience in React Native
• Strong knowledge of JavaScript (ES6+) / TypeScript
• Hands-on experience with React Hooks and Functional Components
• Experience with Redux / Context API
• Strong understanding of mobile UI/UX guidelines
• Experience with REST APIs and third-party SDK integration
• Familiarity with Android Studio and Xcode
• Experience using Git for version control

Good to Have

• Experience with Native Modules (Android / iOS)
• Knowledge of Expo
• Experience with Firebase (Auth, Push Notifications, Analytics)
• Familiarity with CI/CD pipelines for mobile apps
• Understanding of app performance optimization techniques

Behavioral & Soft Skills

• Strong analytical and problem-solving skills
• Good communication and collaboration abilities
• Ability to work independently and meet deadlines
• Willingness to work from office in Kolkata

What We Offer

• Stable work-from-office role in Kolkata
• Opportunity to work on live production mobile applications
• Career growth and technical learning opportunities
• Supportive and collaborative work environment

Key Responsibilities

The Mobile Lead Developer with a minimum of 3-6 years of experience to develop a React Native Mobile App

Job Overview

The primary role of this position will be to develop rich Mobile/Web applications for a new Reillo product.

Primary Skills

·        Experience with popular application development frameworks such as React Native with excellent JavaScript, Typescript, ES6 or greater, HTML5, and CSS development skills

·        Experience in iOS and Android Application development

·        Experience with modern front-end build pipelines and tools such as Webpack

·        Solid understanding of MVC, stateless APIs, Redux and building RESTful APIs

·        Experience on tools like Jest or React Testing Libraries

·        Familiarity with code versioning tools such as Git

·        Ability to communicate effectively and make effective presentations

·        Experience with ReactJS for Web App development will be an added advantage.

Job Description:

• Min 4-5 years of experience in Mobile application development
• Min 2-year Experience in React Native app development
• Firm grasp of the JavaScript and TypeScript language and its nuances, including ES6+ syntax
• Follow best practices using Android Guidelines
• Knowledge of functional or object-oriented programming
• Technically strong in React-Redux/Mobx development and deep understanding of core mobile concepts such as lifecycle, UI, networking, caching, device features, etc
• Experiences with automated testing suites, like Jest or Mocha
• Experience integrating third-party frameworks. Worked with logging and capturing user navigation and app usage to Analytics and Crashlytics for understanding the most used features by users.
• Knowledge of mobile security and cryptography is an advantage.
• Good working knowledge of tools such as Git, JIRA, Jenkins, or any tools that are similar to these.
• Experience with agile methodology is preferred
• Good communication skills
• Good knowledge of app telemetry integration & app performance management
• Have published at least 2 React Native apps on Play Store & Appstore

• Implement robust app architectures and complex user interfaces
• Component Design and coding new features. includes unit tests, debugs, and solves defects
• Component Design/Coding/Unit Testing/Debugging
• Responsible for designing app architecture and integration design to various external systems (APIs, 3rd Party SDK)
• Follow best practices using React Native Guidelines
• Understand reacting design patterns like HOC, Render Props, and their applications.
• Good understanding of atomic design principles
• Experience with CSS-in-js / styled-components
• Good understanding of Android & iOS working principles, Release process
• Ability to multi-task under pressure and work independently with minimal supervision
• Work on high-performance consumer-facing apps
• Understanding the nature of asynchronous programming and its quirks and workarounds.
• Good understanding of server-side templating languages (such as jade, EJS, and pug).
• Creating database schemas that represent and support business processes.
• Implementing automated testing platforms and unit tests.
• Basic understanding of front-end technologies, such as HTML5, SCSS, and CSS3.
• Ability to make recommendations on UI design and UX best practices.

Company Introduction 
Crumb Software is a Design Studio seeking creative and skilled developers to join our fast-growing team. Our mission is to design and develop technology that improves its users' lives while providing an exceptionally high level of service to our clients.

We are looking for experienced developers who want to be part of a fast-paced, dynamic environment, where everyone's opinions and efforts are valued. We hire outstanding professionals and allow them to thrive in a collaborative atmosphere that values learning, growth, and hard work.

If you have the desire to be a part of an exciting, challenging, and rapidly-growing software development consultancy, and if you are passionate about software development and creating the finest apps in the market, please consider applying.

Job Description 
We are looking for React Native developers interested in building performant mobile apps on both the iOS and Android platforms. You will be responsible for architecting and building these applications, as well as coordinating with the teams responsible for other layers of the product infrastructure. Building a product is a highly collaborative effort, and as such, a strong team player with a commitment to perfection is required.

This is a contract-based position and we're looking for immediate joiners. 

Responsibilities

• Work as a part of a small team to build React Native iOS / Android applications
• Collaborate closely with designer(s) to build the envisioned user experience
• Architect, build, and maintain excellent React Native applications with clean code
• Implement clean, modern, smooth animations and transitions that provide an excellent user experience
• Build pixel-perfect, buttery smooth UI's across both mobile platforms that match designs
• Integrate with the backend and other third-party APIs
• Work with native modules if required
• Leverage native APIs for deep integrations with both platforms
• Diagnose and fix bugs, performance bottlenecks for performance that feels native

Requirements

• 3+ years of professional, non-internship experience working with React Native
• Firm grasp of the JavaScript language and its nuances, including ES6+ syntax
• An understanding of React Native best practices and a commitment to following them
• Knowledge of functional programming and React Hooks
• Ability to work through new and difficult React Native issues and contribute to libraries as needed
• Familiarity with native build tools, like XCode and Gradle
• Familiarity with Expo and related libraries
• Excellent verbal and written communication skills
• Experience and desire to work with a remote, distributed team

Largest network of beauty and wellness store with over 150 stores across Bangalore, Chennai, Hyderabad, Cochin, Mumbai, Pune, Bhubaneswar and Kolkata. In addition to the stores, also have a strong online presence:
Job description:
Basic knowledge in Javascript, HTML, CSS

Knowledge in React JS, React native components

Latest Technology knowledge like hooks, Redux

Number of apps released/live in React native /Anroid & IOS, Business nature of the app

Understanding of deep react-native concepts

Understanding of advanced concepts like optimizing app

Understanding of security, deployment, app releases

1. Understanding of support of app on multiple screens, android and ios versions, iterative development and enhancement of the app

SUMMARY

We are looking for a React Native developer interested in building performance mobile apps on both the iOS and Android platforms. You will be responsible for architecting, designing, and building these applications, as well as coordinating with the teams responsible for other layers of the product infrastructure. Building a product is a highly collaborative effort, and as such, a strong team player with a commitment to perfection is required. We are looking for self-motivated, energetic candidates who are looking for the next set of challenges in their careers. Mobile app developer, you will be responsible for developing and maintaining the mobile app. NOT a classic Website Development job involving simple development and maintenance of websites. We work on complex web applications that are technologically challenging. The projects are done in small teams, which results in greater responsibility for each member of the team. We genuinely want you to learn and grow and will provide you ample opportunities for that.

Responsibilities:-

• Deliver innovative solutions to drive next-generation user experiences, designs, and technologies.
• In-depth knowledge and proven record in developing mobile apps.
• Extensive experience with React and state management frameworks such as Redux/MobX.
• Experience with React Native.
• Technical knowledge of RDBMS.
• Development experience with iOS/Android or both.
• Strong knowledge of data structures, algorithms, and run-time optimization.
• Ability to write well-documented, clean JavaScript code.
• 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.
• Maintain code and write automated tests to ensure the product is of the highest quality.
• Rock-solid at working with third-party dependencies and debugging dependency conflicts

Required Skills:-

• Firm grasp of the JavaScript (and Typescript or Closure Script) language and its nuances, including ES6+ syntax.
• Knowledge of (functional or object-oriented) programming.
• Familiarity with native build tools, like XCode, Gradle (Android Studio, IntelliJ)
• Understanding of REST APIs, the document request model, and offline storage.
• Experience with automated testing suites, like (Jest or Mocha)
• React Native
• Redux/Mobx
• RDBMS,
• Third-Party SDK integration.
• Development experience with IOS/Android or both

Industry: IT / E-Learning and Assessment

Functional Area: IT Software - Application Programming, Maintenance

Role Category: Programming & Design

Role: React Developer

Employment Type: Permanent Job, Full Time

Qualification: B.E./B.Tech./MCA