Senior Android Developer | Kotlin SDK

Offshore 24/7; United States; Remote; USD 83,000 - 165,000; Part time

Job summary

Offshore 24/7 is seeking a seasoned Android SDK developer to design, package and validate a reusable Kotlin SDK for mobile apps. You will implement secure auth, REST integrations for nutrition and AI features, and deliver clear documentation for teammates and third-party integrators.

The contract runs 3–4 months with fully remote work from home. You will join an established Australian business and collaborate with product teams to ensure production-ready release.

Qualifications

• At least 5 years of native Android development with Kotlin.
• Experience building Android SDKs or libraries, not only apps.
• Gradle, AAR packaging and SDK distribution.
• Token-based authentication, session management and secure storage on Android.
• Jetpack Compose and/or Android Views.
• Android architecture, modularisation and dependency management.

Responsibilities

• Design and build a modular, reusable Android SDK in Kotlin that host apps can embed.
• Define the SDK interfaces and reusable native UI components host apps integrate against.
• Integrate REST APIs behind nutrition, meal-planning and AI-powered features, handling networking, error states and performance.
• Build secure authentication: token management, session handling, secure storage and user sync.
• Package, version and distribute the SDK with Gradle and AAR.
• Integrate and validate the SDK inside an existing production Android app.
• Write the integration documentation and support testing through to production release.

Skills

Kotlin

Android SDK

Gradle & AAR

Jetpack Compose

Coroutines & Flow

Networking APIs

Testing

Debugging

Modular architecture

Independent work

Tools

Gradle

Android Studio

Job description

You'll build a reusable native Android SDK in Kotlin for an established Australian business developing nutrition and meal-planning technology. Third-party Android apps will embed what you build, so the work is as much about clean interfaces, packaging and documentation as it is about code.

It's a short, focused contract with a clear finish line: design the SDK, package and version it, prove it inside an existing production Android app, and support it through to release.

Quick facts

• Location: 100% work from home
  
• Hours: Monday to Friday, 7:00 AM - 4:00 PM PHT
  
• Engagement: Contract, 3-4 months, starting immediately
  

What you'll be doing

• Design and build a modular, reusable Android SDK in Kotlin that host apps can embed
  
• Define the SDK interfaces and reusable native UI components host apps integrate against
  
• Integrate REST APIs behind nutrition, meal-planning and AI-powered features, handling networking, error states and performance
  
• Build secure authentication: token management, session handling, secure storage and user sync
  
• Package, version and distribute the SDK with Gradle and AAR
  
• Integrate and validate the SDK inside an existing production Android app
  
• Write the integration documentation and support testing through to production release
  

What you'll need

• At least 5 years of native Android development with Kotlin
  
• Experience building Android SDKs or libraries, not only apps
  
• Gradle, AAR packaging and SDK distribution
  
• Token-based authentication, session management and secure storage on Android
  
• Jetpack Compose and/or Android Views
  
• Android architecture, modularisation and dependency management
  
• Kotlin Coroutines, Flow and modern asynchronous patterns
  
• Strong debugging, performance and testing habits
  
• Experience working in an existing production Android codebase
  
• Comfortable owning your work independently, and available to start immediately
  

Nice to have

• Experience building an SDK for third-party commercial integrations
  
• CameraX or image processing
  
• AI or chat functionality in a mobile app
  
• CI/CD and automated SDK publishing
  
• Node.js and Express backend experience
  
• Health or fitness consumer mobile experience, or a startup background
  
• 100% work from home
  
• Monday to Friday, 7:00 AM - 4:00 PM PHT
  
• Annual rate and performance review
  
• Comprehensive training and ongoing professional development
  
• Regular staff events and team activities
  
• Direct exposure to Australian clients and business practices