Senior Android Developer | Kotlin | React Native | FirebaseBill Vivino
I offer end-to-end Android app development using Kotlin and Jetpack Compose, delivering high-performance, scalable, and secure applications tailored to your needs. My expertise spans custom UI/UX, API integrations, Bluetooth connectivity, Firebase, and cloud services to ensure seamless functionality and a great user experience. My focus on clean, maintainable code, deep technical knowledge, and hands-on experience across multiple industries sets me apart, ensuring your app is future-proof and optimized for success.
What's included
Fully Functional Android App
1. Fully Functional Android App – A complete Android application built using Kotlin/Jetpack Compose or XML, tailored to your requirements.
Clean & Maintainable Codebase
Well-structured, documented, and scalable code following best practices.
App Deployment & Store Submission
Assistance with Google Play Store submission, including compliance with store policies.
User Authentication & Security
If required, secure user authentication (Firebase Auth, OAuth, etc.) and encrypted data handling.
Backend Integration
Seamless integration with Firebase, REST APIs, GraphQL, or any backend service.
Database Setup
Local (Room, SQLite) or cloud-based (Firestore, Supabase, AWS DynamoDB) database implementation.
Push Notifications & Background Services
Implement push notifications (FCM) and background tasks (WorkManager).
Third-Party SDK Integrations
Integration of required SDKs such as Stripe, Maps, Bluetooth, or Analytics.
Automated Testing & QA
Unit tests, UI tests, and manual testing to ensure app reliability.
App Performance Optimization
Efficient memory usage, optimized animations, and smooth UI/UX performance.
Documentation & Handover
API documentation, setup guides, and post-launch support instructions.
FAQs
I specialize in Android (Kotlin/Jetpack Compose) and iOS (SwiftUI/UIKit) app development, providing end-to-end services from planning and design to development, testing, and deployment. I also offer backend integration, API development, Bluetooth connectivity, push notifications, Firebase services, and cloud hosting solutions.
Yes, I develop native apps for both Android (Kotlin) and iOS (SwiftUI/UIKit). I also work with React Native for cross-platform projects when needed.
I assist with the entire deployment process, ensuring your app meets Google Play and Apple App Store guidelines and handling metadata, screenshots, and compliance checks.
I follow a structured process:
1. Requirement Gathering & Planning
2. UI/UX Design (if needed)
3. Development (Agile Iterations)
4. Testing & Debugging
5. Client Review & Refinements
6. Deployment & Store Submission
7. Post-Launch Support & Maintenance
Timelines vary based on complexity. Simple apps may take 2-4 weeks, while complex apps with APIs, real-time features, or Bluetooth integration may take 2-3 months or more.
I charge an hourly rate of $150/hr, and project estimates are based on the scope and complexity. After an initial consultation, I can provide fixed-cost estimates for larger projects.
Yes, I offer ongoing support, updates, bug fixes, and feature enhancements to keep your app running smoothly after launch.
Absolutely! I have experience integrating payment gateways (Stripe, Apple Pay), Firebase services, Bluetooth LE devices, APIs, and various cloud platforms (AWS, GCP, Firebase, Supabase).
I can refactor, debug, optimize, or extend existing iOS or Android codebases.
I bring years of hands-on experience, a focus on clean and scalable code, and a deep understanding of native mobile development best practices. I don’t just build apps—I ensure they are efficient, user-friendly, and future-proof.
Example work
Starting at$125 /hr
Tags
Android Studio
C#
JavaScript
Kotlin
React Native
Mobile Engineer
Software Consultant
Software Engineer
Service provided by
Bill Vivino proWayne, USA
- 1
- Followers
Senior Android Developer | Kotlin | React Native | FirebaseBill Vivino
Starting at$125 /hr
Tags
Android Studio
C#
JavaScript
Kotlin
React Native
Mobile Engineer
Software Consultant
Software Engineer
I offer end-to-end Android app development using Kotlin and Jetpack Compose, delivering high-performance, scalable, and secure applications tailored to your needs. My expertise spans custom UI/UX, API integrations, Bluetooth connectivity, Firebase, and cloud services to ensure seamless functionality and a great user experience. My focus on clean, maintainable code, deep technical knowledge, and hands-on experience across multiple industries sets me apart, ensuring your app is future-proof and optimized for success.
What's included
Fully Functional Android App
1. Fully Functional Android App – A complete Android application built using Kotlin/Jetpack Compose or XML, tailored to your requirements.
Clean & Maintainable Codebase
Well-structured, documented, and scalable code following best practices.
App Deployment & Store Submission
Assistance with Google Play Store submission, including compliance with store policies.
User Authentication & Security
If required, secure user authentication (Firebase Auth, OAuth, etc.) and encrypted data handling.
Backend Integration
Seamless integration with Firebase, REST APIs, GraphQL, or any backend service.
Database Setup
Local (Room, SQLite) or cloud-based (Firestore, Supabase, AWS DynamoDB) database implementation.
Push Notifications & Background Services
Implement push notifications (FCM) and background tasks (WorkManager).
Third-Party SDK Integrations
Integration of required SDKs such as Stripe, Maps, Bluetooth, or Analytics.
Automated Testing & QA
Unit tests, UI tests, and manual testing to ensure app reliability.
App Performance Optimization
Efficient memory usage, optimized animations, and smooth UI/UX performance.
Documentation & Handover
API documentation, setup guides, and post-launch support instructions.
FAQs
I specialize in Android (Kotlin/Jetpack Compose) and iOS (SwiftUI/UIKit) app development, providing end-to-end services from planning and design to development, testing, and deployment. I also offer backend integration, API development, Bluetooth connectivity, push notifications, Firebase services, and cloud hosting solutions.
Yes, I develop native apps for both Android (Kotlin) and iOS (SwiftUI/UIKit). I also work with React Native for cross-platform projects when needed.
I assist with the entire deployment process, ensuring your app meets Google Play and Apple App Store guidelines and handling metadata, screenshots, and compliance checks.
I follow a structured process:
1. Requirement Gathering & Planning
2. UI/UX Design (if needed)
3. Development (Agile Iterations)
4. Testing & Debugging
5. Client Review & Refinements
6. Deployment & Store Submission
7. Post-Launch Support & Maintenance
Timelines vary based on complexity. Simple apps may take 2-4 weeks, while complex apps with APIs, real-time features, or Bluetooth integration may take 2-3 months or more.
I charge an hourly rate of $150/hr, and project estimates are based on the scope and complexity. After an initial consultation, I can provide fixed-cost estimates for larger projects.
Yes, I offer ongoing support, updates, bug fixes, and feature enhancements to keep your app running smoothly after launch.
Absolutely! I have experience integrating payment gateways (Stripe, Apple Pay), Firebase services, Bluetooth LE devices, APIs, and various cloud platforms (AWS, GCP, Firebase, Supabase).
I can refactor, debug, optimize, or extend existing iOS or Android codebases.
I bring years of hands-on experience, a focus on clean and scalable code, and a deep understanding of native mobile development best practices. I don’t just build apps—I ensure they are efficient, user-friendly, and future-proof.
Example work
$125 /hr