Senior Android Developer | Kotlin | React Native | Firebase

Pro

Bill Vivino

Starting at

150

/hr

About this service

Summary

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.

Process

Android App Development Process

1. Initial Consultation & Requirement Gathering

• Understand the client’s vision, goals, and target audience.

• Define app features, technical requirements, and platform considerations.

2. Scope & Proposal

• Outline project deliverables, timeline, and cost estimates.

• Define milestones and success criteria.

3. UI/UX Design & Wireframing (if applicable)

• Create wireframes and prototypes for app flow.

• Design visually appealing and user-friendly interfaces.

4. Architecture & Tech Stack Planning

• Select the appropriate technology stack (Kotlin, Jetpack Compose, Firebase, etc.).

• Plan the database structure and API endpoints.

5. Development (Agile Iterations)

• Implement core features and backend integration.

• Develop user authentication, data storage, and other functionalities.

• Ensure responsiveness and smooth UI interactions.

6. Testing & Debugging

• Conduct unit testing, UI testing, and performance testing.

• Identify and fix bugs, optimize performance.

7. Client Review & Feedback

• Provide test builds for client review.

• Implement requested revisions and enhancements.

8. Deployment & Play Store Submission

• Prepare and submit the app to the Google Play Store.

• Ensure compliance with Google Play policies.

9. Post-Launch Support & Maintenance

• Monitor performance and user feedback.

• Provide updates, bug fixes, and feature enhancements as needed.

FAQs

1. What services do you offer as a mobile app developer?
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.
2. Do you handle both iOS and Android development?
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.
3. Can you help publish the app on the Google Play Store and Apple App Store?
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.
4. What’s your typical process for developing an app?
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
5. How long does it take to develop an app?
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.
6. How much does an app development project cost?
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.
7. Do you offer post-launch support and maintenance?
Yes, I offer ongoing support, updates, bug fixes, and feature enhancements to keep your app running smoothly after launch.
8. Can you integrate third-party services like Stripe, Firebase, or Bluetooth devices?
Absolutely! I have experience integrating payment gateways (Stripe, Apple Pay), Firebase services, Bluetooth LE devices, APIs, and various cloud platforms (AWS, GCP, Firebase, Supabase).
9. Can you work with an existing codebase?
I can refactor, debug, optimize, or extend existing iOS or Android codebases.
10. Why should I work with you?
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.

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.

Skills and tools

Software Consultant

Mobile Engineer

Software Engineer

Android Studio

JavaScript

Kotlin

React Native

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STARTING AT

$150/hour

hourly rate