
Closed
Posted
Paid on delivery
I already have a fully-built health and wellness app and now need an experienced engineer to wire in a new SDK that will handle health-data synchronisation. The SDK file is ready for you to inspect; what I need is clean, production-ready code that lets users sync Step count, Heart rate and Calorie burn seamlessly across both iOS and Android builds. Here’s how I see the flow: you review the SDK documentation, plan the best way to surface the sync endpoints in our existing architecture, build the bridge layer for iOS (Swift) and Android (Kotlin/Java), then hand back a tested, merge-ready pull request along with brief implementation notes. I’ll provide the repo, the current data models and access to our staging API as soon as we start. Please have proven experience integrating third-party SDKs into live apps; this is critical because I don’t have bandwidth for a learning curve on this part of the project. Key deliverables • End-to-end health-data sync for Step count, Heart rate and Calorie burn on both platforms • All compile-time errors resolved and unit/instrumentation tests passing • Short read-me covering setup, key classes and any new build-gradle / Podfile entries If that matches your skillset, let’s get moving.
Project ID: 40200646
163 proposals
Remote project
Active 7 days ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
163 freelancers are bidding on average $490 USD for this job

Hi there, I’ve led cross-platform SDK integrations in production apps and built clean bridge layers in Swift and Kotlin that surface third-party endpoints with robust error handling and test coverage. I will review your SDK docs, design a bridge layer that cleanly exposes Step, Heart rate and Calorie data in your existing data model, implement a reliable, production-ready sync path for both iOS and Android, and deliver a merge-ready PR with concise implementation notes. Deliverables: end-to-end data sync on iOS and Android; all compile-time issues resolved; unit and instrumentation tests passing; a short README covering setup, key classes, and any build changes. Next steps: I’ll start with an analysis and plan within 1–2 days, then implement, test, and provide the PR within 7–10 more days. Do you have a preferred data model and latency targets for the health-data sync across iOS and Android? Best regards,
$750 USD in 21 days
9.0
9.0

I HAVE WORKED ON SIMILAR PRODUCTION APPS WHERE THIRD-PARTY HEALTH AND DATA SYNC SDKs WERE INTEGRATED CLEANLY INTO LIVE iOS AND ANDROID BUILDS, AND I UNDERSTAND THE NEED FOR A ZERO-LEARNING-CURVE EXECUTION. You already have a live health & wellness app and need an experienced engineer to integrate a provided SDK to enable reliable syncing of Step Count, Heart Rate, and Calorie Burn across iOS and Android, delivering clean, merge-ready code with full tests passing. Approach I will first review the SDK documentation and your existing architecture, then design a minimal, well-isolated bridge layer that fits your current data models and sync flow. On iOS, I’ll implement the integration in Swift; on Android, in Kotlin (or Java if required). The focus will be production safety: error handling, permissions, lifecycle awareness, and consistent data mapping. Integration will be tested against your staging API before delivery. Tech stack iOS: Swift, SDK integration via Podfile/SPM Android: Kotlin/Java, Gradle Existing app architecture respected (no rewrites) Core features Step, Heart Rate, Calorie sync (bi-directional if supported) Robust permission & error handling Clean SDK abstraction layer Unit / instrumentation test validation User roles End User (health data sync) Develop/Admin (maintenance) I will deliver clean source code, a merge-ready PR, concise documentation, and 2 years of free ongoing support post-launch.
$400 USD in 15 days
8.3
8.3

I have extensive experience in Java, Mobile App Development, iPhone, Android, and Swift, making me a great match for the SDK Integration for Wellness App project. I am confident in my ability to deliver end-to-end health-data sync seamlessly on both platforms. The budget can be adjusted after discussing the full scope, and I am committed to working within your budget. Please review my 15-year-old profile to see my past work. Let's discuss the job details and get started right away. I am eager to show my dedication to this project. Looking forward to hearing from you.
$525 USD in 10 days
7.0
7.0

⭐⭐⭐⭐⭐ Hi Valuable Client, This aligns perfectly with our experience. CnELIndia, led by Raman Ladhani, has delivered multiple production-grade health and fitness integrations across iOS and Android, including complex third-party SDK wiring in live apps. Here’s how we’ll ensure a smooth, low-risk delivery: SDK & Architecture Review: Raman will personally review the SDK docs and your existing data models to design a clean sync strategy that fits your current architecture. Platform Bridges: We’ll implement a robust bridge layer in Swift (iOS) and Kotlin/Java (Android) to sync Steps, Heart Rate, and Calorie Burn reliably and efficiently. Production-Ready Code: Focus on thread safety, error handling, background sync, and performance, with zero shortcuts. Testing & Validation: All unit and instrumentation tests will pass, and builds will be fully compile-clean. Merge-Ready Handoff: You’ll receive a tested pull request plus a concise README covering setup, key classes, and any Podfile or Gradle changes. We’re used to jumping straight into mature codebases and delivering without a learning curve. Once you share the repo and staging access, we can get moving immediately.
$500 USD in 7 days
7.0
7.0

Hi, This fits my skill set very well. I have 5+ years of hands-on experience working with Android (Kotlin/Java) and iOS (Swift), including multiple third-party SDK integrations in live, production apps—especially health, fitness, and data-sync use cases. How I’ll approach this: Review the SDK documentation and inspect the provided SDK files. Align the SDK’s sync capabilities with your existing app architecture and data models. Implement a clean bridge layer on: iOS (Swift) Android (Kotlin/Java) Handle permissions, background sync, error states, and edge cases for Steps, Heart Rate, and Calories. Validate data flow against your staging API. Deliver a tested, merge-ready PR with passing unit/instrumentation tests. What you’ll get: Seamless end-to-end health-data sync on both platforms Production-ready, maintainable code following platform best practices No compile-time issues A short README covering setup, key classes, and any Podfile / Gradle changes I’m comfortable jumping straight into existing codebases and integrating SDKs without a learning curve. Once you share the repo and SDK docs, I can start immediately. Looking forward to working together. Best, Bhargav
$500 USD in 7 days
6.9
6.9

Hello, I will develop your HEALTH AND WELLNESS MOBILE APPLICATION for Android and IOS both platforms with Web admin panel. I am Tulsiram. I have 10 years of experience working as Native and Crossplatform mobile application developer. I am understood your requirements. I am glad if we are working together. If you interested then let's connect. I will provide you Daily updates ,source code after development completed, 1 Year maintenance Support in following Steps: I will available daily 10-12 hours in Working days for you. I will provide you regular updates according to which modules we will decided. After approval each module by you then i will provide your complete source code of your project and will shift on your Domain. Thanks
$250 USD in 22 days
6.6
6.6

Hi, I will integrate your new health data sync SDK into the existing iOS and Android apps. This will enable the apps to sync step data, heart rate, and calories burned. I will read the SDK documentation, create a simple bridge layer in Swift and Kotlin (or Java) to match your existing infrastructure, and then submit a tested and ready-to-merge pull request. You will also receive a brief readme file on setup, key classes, and changes to Podfile or Gradle. I’ve done similar work before. Could you please start the chat so I can show you a few samples? Best regards, Kamran
$250 USD in 10 days
7.3
7.3

Hi there, ★★★ Mobile App Development / Android App Development Expert ★★★ 7+ Years of Experience ★★★ I will complete this project by implementing the SDK into your health and wellness app following these steps: 1. Review the SDK documentation and understand the integration requirements (4 hours) 2. Plan the sync endpoints within your existing architecture (3 hours) 3. Develop the bridge layer for iOS using Swift (8 hours) 4. Develop the bridge layer for Android using Kotlin/Java (8 hours) 5. Conduct testing to ensure all features are functioning correctly (4 hours) 6. Prepare a brief implementation notes and a merge-ready pull request (3 hours) What I need from you: 1. Access to the repository for the app 2. Current data models used in the app 3. Access to the staging API for testing purposes I look forward to connecting at your convenience to ensure the project's success. Best Regards, TechPlus Team
$600 USD in 4 days
6.4
6.4

Hello, I hope you are doing well. I understand that you are looking to build a WELLNESS MOBILE APPLICATION and I would be happy to help. I have extensive experience in designing and developing Application and have successfully delivered many projects. What I offer: -Development using the latest technologies -Daily project updates and clear communication -On-time delivery within the agreed timeline -Complete source code provided after project completion -One year of support for the developed work -10+ years of experience in web and app development -Fully responsive, fast-loading, and SEO-friendly design -A powerful super admin panel to manage the entire system Please feel free to initiate a chat so we can discuss your requirements in detail. Thank you and regards, Dheeraj K.
$250 USD in 7 days
7.0
7.0

Hello There!!! ⚜⭐⭐⭐⭐⚜(( Seamless Health-Data Sync SDK Integration for iOS & Android ))⚜⭐⭐⭐⭐⚜ Integrating third-party SDKs into live wellness apps requires precision and zero disruption to existing features. You need step count, heart rate, and calorie burn syncing fully operational across iOS and Android. I have extensive experience implementing SDKs in Swift and Kotlin/Java apps, building clean bridge layers, and ensuring full test coverage for production-ready deployment. My approach: review SDK docs, map sync endpoints to current architecture, implement iOS and Android layers, and deliver a merge-ready, fully-tested pull request with clear setup notes. 1. Real-time step count, heart rate, and calorie sync across both platforms 2. Clean, compile-error-free integration with unit and instrumentation tests 3. Concise documentation for setup, key classes, and build configuration I would be happy to dive in and ensure smooth, reliable health-data synchronization. Warm Regards, Farhin B.
$256 USD in 10 days
6.5
6.5

Hi I can integrate your new health-sync SDK into both iOS (Swift) and Android (Kotlin/Java) using clean, production-ready code that fits naturally into your existing architecture. The main technical challenge is bridging the SDK’s endpoints with your current data models, so I’ll design a stable abstraction layer that handles Step count, Heart rate, and Calorie burn without breaking existing flows. I’ll review the SDK documentation, map all sync points, and implement platform-specific bridges that comply with your build pipelines and staging API. All compile-time issues will be resolved, and unit/instrumentation tests will pass before the pull request is submitted. You’ll receive a merge-ready PR plus a concise read-me detailing setup steps, key classes, and any Podfile/Gradle additions. My background includes integrating third-party SDKs into live production apps, ensuring smooth onboarding with no learning-curve overhead on your side. This gives you a reliable, fully tested sync layer that behaves consistently across both platforms. Thanks, Hercules
$500 USD in 7 days
6.3
6.3

Hi I can integrate your health data SDK cleanly into your existing wellness app with production ready code on both iOS and Android. I have solid experience wiring third party SDKs into live apps where stability test coverage and merge readiness matter more than experimentation. I will start by reviewing the SDK documentation and your current architecture then design a clear bridge layer that fits your existing data models and sync flow. On iOS I will implement this in Swift and on Android in Kotlin or Java depending on your current setup. The sync will cover step count heart rate and calorie burn with proper error handling and lifecycle awareness. You will receive a tested pull request with all compile time issues resolved unit or instrumentation tests passing and a short read me explaining setup key classes and any Podfile or Gradle changes. The goal is a smooth merge with no follow up surprises. Best, Justin
$500 USD in 7 days
5.9
5.9

Hi there, I'm excited about the opportunity to integrate the SDK into your health and wellness app. Having worked extensively with third-party SDKs, I understand the nuances of creating seamless data synchronization. My experience includes optimizing health-related applications, so I can ensure that the step count, heart rate, and calorie burn metrics sync effortlessly for both iOS and Android platforms. I'll begin by thoroughly reviewing the SDK documentation to develop a robust integration plan. My approach focuses on creating a well-structured bridge layer using Swift for iOS and Kotlin/Java for Android. I will deliver clean, production-ready code that resolves all compile-time errors and includes comprehensive tests. You'll receive a merge-ready pull request alongside a detailed readme for setup and key classes. Looking forward to accessing the repo and getting started. Thanks,
$750 USD in 10 days
5.8
5.8

I’m a senior mobile engineer with 7+ years of experience integrating complex third-party SDKs into live Android and iOS apps, including health and fitness data flows. I can cleanly wire your SDK into both platforms, handle HealthKit/Google Fit sync if required, and deliver tested, merge-ready code within your timeline.
$500 USD in 7 days
5.5
5.5

Hello, I have reviewed the details of your project. i will review the sdk documentation thoroughly and mapping out which endpoints need to connect with the existing health and wellness app data models. for ios, i will create a bridge in swift that hooks into the sdk to read step count, heart rate, and calorie burn, then forwards the data to the app’s storage layer. for android, i will do the same in kotlin, ensuring thread safety and proper lifecycle handling so syncing runs reliably in the background. unit tests and instrumentation tests will verify that all three data types sync correctly and consistently across devices. any new podfile or gradle entries will be documented clearly in a read-me, along with example calls for future maintenance. Let's have a detailed discussion, as it will help me give you a complete plan, including a timeline and estimated budget. I will share my portfolio in chat I look forward to hear from you. Thanks Best Regards, Mughira
$500 USD in 7 days
5.1
5.1

SDK Integration for Wellness App I’m a full-stack software engineer with expertise in React, Node.js, Python, and cloud architectures, delivering scalable web and mobile applications that are secure, performant, and visually refined. I also specialize in AI integrations, chatbots, and workflow automations using OpenAI, LangChain, Pinecone, n8n, and Zapier, helping businesses build intelligent, future-ready solutions. I focus on creating clean, maintainable code that bridges backend logic with elegant frontend experiences. I’d love to help bring your project to life with a solution that works beautifully and thinks smartly. To review my samples and achievements, please visit:https://www.freelancer.com/u/GameOfWords Let’s bring your vision to life—connect with me today, and I’ll deliver a solution that works flawlessly and exceeds expectations.
$250 USD in 3 days
5.3
5.3

Hi, This fits squarely into what I do. I have hands-on experience integrating third-party SDKs into live iOS (Swift) and Android (Kotlin/Java) apps, especially where health or sensor-based data needs to be synced reliably and cleanly. I’m comfortable reviewing SDK docs quickly, mapping them into an existing architecture, and delivering production-ready, merge-safe code—not experiments. Approach • Review SDK documentation and assess best integration points • Design a clean bridge layer aligned with your current data models • Implement end-to-end sync for Steps, Heart Rate, and Calories on both platforms • Validate with staging API and ensure all builds/tests pass • Deliver a merge-ready PR + concise implementation notes Deliverables • Fully working health-data sync on iOS & Android • Zero compile-time errors, tests passing • Short README covering setup, key classes, and new Gradle/Podfile changes I’m used to stepping into existing codebases and moving fast without a learning curve. Once repo access is shared, I can get started immediately. Thanks, Subhajit K.
$265 USD in 7 days
5.1
5.1

With over a decade of experience as a full-stack developer, I'm confident that I possess the proficiency you're seeking for your SDK integration project. My technical fluency in Java, Swift, Kotlin, and Javascript directly aligns with your requirements for your wellness app, making me well equipped to handle and swiftly resolve any complexities that may arise. Having worked with substantial integrated databases such as Firebase, MySQL, AWS DynamoDB, Postgre SQL and SQLite¸ I'm also able to ensure the smooth synching of health-data; whether it's step count, heart rate or calorie burn across both iOS and Android platforms. Having navigated through a vast range of app development projects on multiple platforms, both in healthcare and other sectorsI have honed my skills at delivering clean production-ready code within specified timeframes. As such I can confidently assure you that not only will all compile-time errors be resolved and tests be passing but also provide README notes covering setup, key classes and any new build-gradle / Podfile entries.
$250 USD in 7 days
5.7
5.7

As an experienced full-stack software engineer, I specialize in building and scaling all types of applications, including mobile apps for both iOS and Android platforms. I strongly believe that successful app development is not just about writing code, but about solving real business problems using the most appropriate technologies. That's why I'm confident I can seamlessly integrate the third-party health data synchronization SDK into your wellness app. Not only do I bring technical proficiency in Swift, Kotlin, and Java- three key languages for iOS and Android integration- but I also have a proven track record of delivering robust, production-ready products with as minimal tech debt as possible. Moreover, my profound understanding of REST & GraphQL APIs, which are essential for data syncing, will surely help me facilitate a smooth merger between your existing architecture and this new SDK. Over the years, I've taken charge of multiple projects that demanded clean, maintainable code like yours does now. Working with me means you're not only availing an implementer but also a strategic thinker that approaches every task from a business owner's mindset. I believe communication is the key to success in every project and hence guarantee daily progress updates along with instant replies. Let's maximize every step(count), beat every heart rate and burn all the calories involved in this project together. Don't hesitate to reach out!
$399 USD in 5 days
5.0
5.0

Hi There!!! THE GOAL OF THE PROJECT:- Integrate a third party health data SDK into an existing wellness app with reliable sync across iOS and Android. I carefully read your project and understand you already have a live health and wellness app, a ready SDK, and need clean production ready integration that syncs step count, heart rate, and calorie burn, using Swift for iOS and Kotlin or Java for Android, delivered as a tested, merge ready pull request with clear documentation. I am the best fit because I have proven experience integrating complex third party SDKs into live mobile apps without disruption or rework. iOS and Android SDK integration using Swift and Kotlin or Java End to end health data sync with testing and error free builds Clean bridge layer aligned with existing architecture and models I provide integration level UI support where needed, data handling, testing, documentation, and full source code delivery through a merge ready pull request. I have 9+ years experience as a full stack developer and have completed similar mobile SDK integrations for fitness, health, and data driven applications in production. Looking forward to chat with you for make a deal Best Regards Elisha Mariam!
$251 USD in 16 days
5.0
5.0

Dubai, United Arab Emirates
Payment method verified
Member since Oct 21, 2025
$750-1500 USD
$8-15 CAD / hour
$15-50 USD
$15-25 USD / hour
₹12500-37500 INR
$30-250 USD
₹12500-37500 INR
$250-750 USD
min €36 EUR / hour
min $100000 USD
min ₹2500 INR / hour
$10-1000 USD
$250-750 USD
$250-750 USD
$250-750 USD
$250-750 USD
$30-250 USD
₹1500-12500 INR
£18-36 GBP / hour
$3000-5000 USD
$250-750 AUD