Project Overview: We are developing an Android mobile application for a BLE-based fitness wristband. We have an Android SDK (AAR) and sample applications, which will be used as the foundation for development. This project is strictly for an individual freelancer (not a company, agency, or team). We are looking for a dedicated Android developer who can fully own and execute this task. Important: Individual Freelancers Only Companies / agencies / development teams - please do not apply Only individual Android developers will be considered You must personally do the development work Applications that appear to be from companies or groups will be rejected. What We Provide: Android SDK (AAR format) from the device manufacturer Official SDK documentation Sample Android app demonstrating BLE communication and data sync Physical fitness wristband device for testing (details shared after selection) Scope of Work (Main Project): After successful test completion, the selected freelancer will: 1. Develop a clean, production-ready Android application 2. Integrate the provided SDK for BLE communication 3. Read and display health data from the wristband, including: Heart rate SpO₂ Steps Sleep data HRV / stress (as supported by SDK) Temperature Blood Oxygen Stress Exercise Record Female Health 4. Implement: Device scanning & pairing Stable background BLE connection Data sync and parsing 5. Display health data in a structured UI (dashboard / lists / charts) 6. Follow Android best practices (permissions, background services, battery optimization) 7. Update the health data with the cloud server. Mandatory Test Phase (Before Project Award): To ensure technical capability,all shortlisted candidates must complete a small test task. Test Task Description: Create asimple Android test app that: 1. Uses the provided SDK & sample code 2. Connects to the fitness wristband via BLE 3. Reads available health data from the device 4. Displays the data in asimple row / table format, e.g.: ``` Heart Rate : 72 bpm SpO₂ : 98 % Steps : 4321 Sleep (hrs) : 6.5 Stress Index : 42 ``` UI design is not important Focus is oncorrect SDK integration and data reading Source code must be shared for review Test Outcome: Successful test → Project will be awarded Unsuccessful test → No project award This test is only to verify skill, not to exploit free work. Required Skills Strong experience in Android (Java/Kotlin) Hands-on experience with BLE (Bluetooth Low Energy) Experience integrating AAR SDKs Understanding of background services, permissions, and battery optimizations Ability to read and work with vendor SDK documentation Clean, well-structured coding style Preferred (Nice to Have): Experience with fitness bands / wearables Experience with health data (HR, SpO₂, sleep) Familiarity with MVVM or clean architecture Ability to suggest SDK or firmware-related improvements Timeline: Test app: Short evaluation phase (few days) Full project: To be discussed after test completion How to Apply (Very Important) When applying, please include: 1. Confirmation that you are anindividual freelancer, not a company 2. Brief description of yourAndroid + BLE experience 3. Examples (GitHub / Play Store links if available) 4. Confirmation that you are willing to complete the test app 5. Your availability per day for this project Generic copy-paste proposals will be ignored. We are looking for a reliable, technically sound developer to build a strong foundation.