Senior Android Developer | Kotlin SDK

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 Pay: PHP 140,000 - PHP 160,000 per month 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

Requirements 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 REST API integration, including authentication flows 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 OAuth 2.0, JWT or secure token exchange 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

Benefits PHP 140,000 - PHP 160,000 per month 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 If you've built and shipped a native Android SDK in Kotlin, packaged it as an AAR and can start now, we'd like to hear from you.