Fitness Tracker

Hello Evgeny!
Interested in your project to create an MVP mobile application Fitness Tracker.
Ready to develop the app in Kotlin (BLE + UI) and Rust (data processing, buffering) with synchronization via REST API.
Experience includes over 3 years with BLE on Android, including FFI and token authorization.
Plan to implement BLE connection to WitMotion, local buffering, automatic synchronization, and a simple UI (Start, Pause, Comment).
Looking forward to collaborating!
Waiting for the specifications and protocol to get started.

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Hi! I'm an experienced software developer with a strong background in BLE communications, Rust, and Kotlin, focused on building high-performance and stable mobile applications with native low-level integrations.

🧩 What I bring to your project:

✔️ Proven experience working with Bluetooth Low Energy (BLE) on Android, including handling connection drops and background data processing.

✔️ Solid hands-on expertise in Rust + FFI (JNI) — used it to build performance-critical modules and state machines integrated into mobile workflows.

✔️ Experience with data buffering, offline handling, and session management, including reconnect logic and automatic synchronization.
…
✔️ Worked with REST APIs, token-based authentication, and secure data transfer.

✔️ Highly attentive to detail — I prioritize minimalism, performance, and clean architecture in production-ready MVPs.

📱 I'm also familiar with project handoff, licensing, and always provide clean documentation, build instructions, and maintainable code.

🛠️ Tech Stack: Kotlin (Android BLE + UI), Rust (FFI), REST (HTTP + Token Auth), optionally Python for validation, Git, Linux.

📦 I can deliver a complete MVP:

BLE data receiver (packet type 0x61)

Rust-based core logic and buffering

Minimal UI: Start / Pause / Comment

Offline-first sync system with REST integration

💬 I'm open to discussing your goals, timeline, and budget. I can work independently or with a partner if needed.

Good day!
My name is Valentin, and I represent Arctic Web Agency. We are a team of experienced web developers specializing in creating modern and effective web solutions for business. I can provide examples of our similar work in private messages. Ready to take on your project!

Sincerely,
Arctic Web Team
Freelancehunt

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Hello,

Allow me to briefly introduce myself and my skills. My name is Slava, I am a Flutter Developer with over 5 years of experience creating high-performance cross-platform mobile applications for startups, SaaS solutions, and complex platforms.

Below are some recent projects I have worked on:
Osama Sushi (https://play.google.com/store/apps/details?id=com.ithinkers.osamasushi): The Osama Sushi app is a convenient and fast delivery service. Install the Osama Sushi app and get online access to our delivery service anytime and anywhere.

Cinch Delivery (https://play.google.com/store/apps/details?id=com.cinchdelivery.android): I developed a Flutter mobile app for this delivery service, providing a seamless user experience and real-time order tracking.

… My technology stack includes:
Cross-platform development: Flutter, Dart
State management: Provider, Riverpod, Bloc
Networking: Dio, HTTP, GraphQL
Local storage: Hive, SharedPreferences, SQLite
Firebase: Authentication, Cloud Firestore, FCM, Analytics
CI/CD: Codemagic, GitHub Actions
Version control systems: GitHub, GitLab, Bitbucket
Tools: Android Studio, VS Code, Postman, Figma (for UI implementation)

If this proposal sounds interesting to you, I would be happy to participate in a 10-15 minute conversation to discuss how I can contribute to your project.

Looking forward to your response!

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Dear
I'm very interested in your Fitness Tracker project and confident I can help deliver the MVP version you're targeting. Here's how I propose to approach it:
About Me
I'm an experienced full stack developer with a strong background in Android development using Kotlin, Rust for performance-critical modules, and Bluetooth Low Energy (BLE) communication. I’ve worked on several real-time data apps and have integrated Rust modules into Kotlin via JNI/FFI in production systems.

✔️ BLE Expertise: I’ve built Android apps communicating with IMU and biomedical sensors over BLE, handling packet loss, reconnection, and background buffering.

✔️ Kotlin + Rust: Proficient in both. Comfortable managing JNI bindings and keeping the boundary clean.

… ✔️ Robust Session Management: I’ve implemented similar state machines (start, pause, buffer, sync) before.

✔️ Offline Storage + Auto Sync: I can handle SQLite/local storage buffering and reliable background syncing.

✔️ Secure API Communication: Familiar with RESTful APIs, token-based auth (OAuth2, JWT).
Development Plan
BLE Module (Kotlin):
Connect to WitMotion sensor
Read and parse packet type 61
Processing Logic (Rust):
Real-time state-machine
Buffering logic (in-memory/local)
Kotlin ↔ Rust Integration:
Via JNI
UI:
Minimal Start / Pause / Comment interface
Offline Buffering:
Detect disconnection and store locally
Reconnection Logic:
Auto-reconnect and push missing data
REST API Sync:
Upload via HTTPS with token-auth
Docs + Build Scripts:
README, project structure, API spec, APK
Deliverables
Complete Kotlin + Rust codebase
APK (or reproducible build)
Developer documentation
REST API mock/server (optional)
Timeline & Availability
I'm available to start immediately and estimate 1–2weeks for MVP delivery, depending on testing cycles and BLE reliability requirements.

If you’re open to it, I’d be happy to jump on a quick call to clarify your exact expectations and architecture. Looking forward to hearing from you.

Best regards,

Hello!
I am excited about your project and believe it is a great fit for my experience. Integrating Bluetooth Low Energy (BLE) with Kotlin for seamless communication and data processing on Android is something I have already worked on, and I have a clear understanding of how to ensure smooth data transfer even in unstable connection conditions.
One approach I would recommend is using an intelligent finite automaton in Rust to process the data stream in real-time.
This guarantees efficient data handling by the application and sufficient reliability in scenarios with unstable connectivity. I am confident that the solution I can create will meet your expectations for performance and simplicity, especially regarding data synchronization between sessions.
I would be happy to discuss this with you!
Thank you!

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Hello.
I have read your project with interest. I am confident that I can do effective and quality work that meets your requirements and expectations. Over 8 years of experience.

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Hello! I have worked with similar technologies - see profile description
There was a project related to LoRa+BLE
I set up my own network across the enterprise territory

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