Lead Cross-Platform Mobile App Developer (Flutter/Firebase) – iOS & Android

Job Overview

We are seeking a Lead Cross-Platform Mobile App Developer to build, launch, and maintain Perfecti on iOS and Android. You will own the application lifecycle—from architecture and development through testing, store deployment, monetization, and ongoing optimization. The app will use Flutter, Firebase, and a freemium subscription model.

Responsibilities

  • Build and maintain one cross-platform application using Flutter and Dart.
  • Design scalable architecture for iOS and Android.
  • Integrate Firebase Authentication, Cloud Firestore, Cloud Functions, Cloud Storage, Analytics, Crashlytics, Cloud Messaging, and App Check.
  • Create secure Firestore data models, access rules, indexes, and backup strategies.
  • Implement freemium features, subscriptions, and in-app purchases using Apple StoreKit, Google Play Billing, or RevenueCat.
  • Integrate REST APIs, SDKs, and third-party services.
  • Translate product and UI/UX requirements into responsive, accessible features.
  • Write clean, documented, maintainable code using established architecture and state-management patterns.
  • Build automated unit, widget, integration, and end-to-end tests.
  • Configure CI/CD, development environments, release builds, and versioning.
  • Manage TestFlight, App Store Connect, Google Play Console, store submissions, and review issues.
  • Monitor crashes, performance, analytics, subscription events, and operating costs.
  • Apply privacy, security, and data-protection best practices.
  • Maintain the codebase in GitHub and provide clear project documentation.
  • Communicate progress, risks, estimates, and technical recommendations.

Skills

  • Extensive production experience with Flutter and Dart.
  • Demonstrated success launching and maintaining Flutter applications on both the Apple App Store and Google Play.
  • Strong experience with Firebase Authentication, Cloud Firestore, Cloud Functions, Cloud Storage, Cloud Messaging, Analytics, Crashlytics, Remote Config, and App Check.
  • Expertise in Firestore security rules, NoSQL data modeling, offline synchronization, indexes, and query optimization.
  • Experience implementing subscriptions, free trials, entitlement management, receipt validation, and purchase restoration.
  • Knowledge of Apple and Google billing policies and store-review requirements.
  • Proficiency with REST APIs, JSON, OAuth, webhooks, and third-party SDK integration.
  • Experience with Flutter state management such as Riverpod, BLoC, or Provider.
  • Understanding of clean architecture, dependency injection, responsive design, accessibility, and platform-specific behavior.
  • Familiarity with Swift and Kotlin for native integrations and troubleshooting.
  • Strong mobile security knowledge, including secure credential storage, API protection, authentication, authorization, and abuse prevention.
  • Experience with GitHub, pull requests, code reviews, automated testing, and CI/CD tools such as GitHub Actions or Codemagic.
  • Ability to test and debug across multiple iPhone, iPad, and Android devices and operating-system versions.
  • Understanding of privacy disclosures, account deletion, data retention, consent, and App Store privacy requirements.
  • Strong written communication, documentation, estimation, and independent problem-solving skills.

Candidates should provide links to live iOS and Android applications they personally helped build, explain their specific contributions, and describe their experience with Firebase and mobile subscriptions.

Pay: $30.00 per hour

Application Question(s):

  • Provide links to at least two Flutter applications you helped launch—one in the Apple App Store and one in Google Play. For each app, describe your responsibilities and which features you personally built.
  • Have you independently taken a Flutter application from requirements through production release on both iOS and Android? Describe the project, your role, timeline, and the most difficult issue you resolved.
  • Store Deployment: Describe your direct experience with App Store Connect, TestFlight, Google Play Console, signing certificates, provisioning profiles, release tracks, privacy disclosures, and store-review rejections. Provide an example of a submission problem you personally resolved.
  • Flutter Architecture: How would you structure a new production Flutter application for long-term scalability? Identify the architecture, state-management approach, testing strategy, and folder structure you would use and explain why.
  • Availability: What is your hourly rate, weekly availability, time zone, and earliest start date? Are you personally performing the work, or will any portion be assigned to another developer?
  • Firebase and Firestore: Describe a Flutter application in which you used Firebase Authentication, Cloud Firestore, Cloud Functions, Cloud Messaging, Analytics, and Crashlytics. How did you structure the data and control access?
  • Freemium Subscriptions: Describe your experience implementing freemium access, free trials, and recurring subscriptions on iOS and Android. Which tools did you use, and how did you handle receipt validation, entitlement synchronization, purchase restoration, cancellations, and subscription expiration?

Work Location: Remote

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Common Interview Questions And Answers

1. HOW DO YOU PLAN YOUR DAY?

This is what this question poses: When do you focus and start working seriously? What are the hours you work optimally? Are you a night owl? A morning bird? Remote teams can be made up of people working on different shifts and around the world, so you won't necessarily be stuck in the 9-5 schedule if it's not for you...

2. HOW DO YOU USE THE DIFFERENT COMMUNICATION TOOLS IN DIFFERENT SITUATIONS?

When you're working on a remote team, there's no way to chat in the hallway between meetings or catch up on the latest project during an office carpool. Therefore, virtual communication will be absolutely essential to get your work done...

3. WHAT IS "WORKING REMOTE" REALLY FOR YOU?

Many people want to work remotely because of the flexibility it allows. You can work anywhere and at any time of the day...

4. WHAT DO YOU NEED IN YOUR PHYSICAL WORKSPACE TO SUCCEED IN YOUR WORK?

With this question, companies are looking to see what equipment they may need to provide you with and to verify how aware you are of what remote working could mean for you physically and logistically...

5. HOW DO YOU PROCESS INFORMATION?

Several years ago, I was working in a team to plan a big event. My supervisor made us all work as a team before the big day. One of our activities has been to find out how each of us processes information...

6. HOW DO YOU MANAGE THE CALENDAR AND THE PROGRAM? WHICH APPLICATIONS / SYSTEM DO YOU USE?

Or you may receive even more specific questions, such as: What's on your calendar? Do you plan blocks of time to do certain types of work? Do you have an open calendar that everyone can see?...

7. HOW DO YOU ORGANIZE FILES, LINKS, AND TABS ON YOUR COMPUTER?

Just like your schedule, how you track files and other information is very important. After all, everything is digital!...

8. HOW TO PRIORITIZE WORK?

The day I watched Marie Forleo's film separating the important from the urgent, my life changed. Not all remote jobs start fast, but most of them are...

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This is a great question because it shows your comfort level with technology, which is very important for a remote worker because you will be working with technology over time...

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