You will get Mobile App Development | Mobile App Developer | Swift Kotlin Developer
Project details
🚀 Are you ready to turn your app idea into reality?
I specialize in building modern, AI-powered mobile applications 🤖 that truly connect with users and deliver measurable results. With strong expertise in React Native, Swift, Objective-C, Kotlin, and Java, I create apps for both iOS 📱 and Android 🤖 that are efficient, scalable, and delightful to use. I also work with tools like Redux, Jetpack Compose, SwiftUI, Firebase 🔥, and REST/GraphQL APIs to deliver seamless functionality.
Here’s what you can expect:
✅ Elegant design – clean, modern interfaces that feel natural and engaging.
✅ Reliable code – maintainable, high-performing architecture built to last.
✅ Smart features – AI-driven solutions tailored to your needs.
✅ Strong branding – polished icons and splash screens 🎨 that highlight your identity.
✅ Premium quality – a final product you’ll be proud to share.
✨ The best next step is a quick call where we can discuss your goals and outline the path forward. Let me know a time that works for you—I’ll gladly provide a free consultation. Together, we can bring your vision to life! 🌟
I specialize in building modern, AI-powered mobile applications 🤖 that truly connect with users and deliver measurable results. With strong expertise in React Native, Swift, Objective-C, Kotlin, and Java, I create apps for both iOS 📱 and Android 🤖 that are efficient, scalable, and delightful to use. I also work with tools like Redux, Jetpack Compose, SwiftUI, Firebase 🔥, and REST/GraphQL APIs to deliver seamless functionality.
Here’s what you can expect:
✅ Elegant design – clean, modern interfaces that feel natural and engaging.
✅ Reliable code – maintainable, high-performing architecture built to last.
✅ Smart features – AI-driven solutions tailored to your needs.
✅ Strong branding – polished icons and splash screens 🎨 that highlight your identity.
✅ Premium quality – a final product you’ll be proud to share.
✨ The best next step is a quick call where we can discuss your goals and outline the path forward. Let me know a time that works for you—I’ll gladly provide a free consultation. Together, we can bring your vision to life! 🌟
Platform
iOSApp Type
Hybrid AppDevelopment Technology
React Native, Kotlin, SwiftApp Purpose
Delivery, Finance, Entertainment, Education, Gaming, Health & Fitness, Lifestyle, Maps & Navigation, Medical, ShoppingExpertise
Cross Browser & Device Compatibility, Localization, Performance OptimizationWhat's included
| Service Tiers |
Starter
$50
|
Standard
$4,500
|
Advanced
$9,500
|
|---|---|---|---|
| Delivery Time | 1 day | 25 days | 45 days |
Number of Revisions | 1 | 5 | Unlimited |
Number of Mobile Operating Systems | 1 | 1 | 1 |
App Store Upload | - | - | |
App Icon Design | - | - | |
Splash Screen | - | - | |
Ad Network Integration | - | - | |
Source Code | - |
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About Valerii
Mobile App Developer | React Native | iOS Swift | Android Kotlin
100%
Job Success
Zaporizhzhya, Ukraine - 8:01 am local time
For the past 9+ years, I’ve been building high-quality, native mobile applications using the best tools available: Swift / SwiftUI / Objective-C for iOS and Kotlin / Java / Jetpack Compose for Android. From sleek, simple apps to massive enterprise-level platforms with complex backend logic, real-time data, and multi-layered architecture — I’ve done it all.
Whether you need a beautifully designed iOS app, a lightning-fast Android product, or a full end-to-end solution that brings together frontend, backend, AI, and scalable infrastructure — I can take your idea and turn it into a polished, production-ready product.
🌟 What I Do
As a Native Mobile Developer, I specialize in building high-performance iOS and Android apps with strong attention to UI, UX, security, and smooth user experiences. I combine clean architecture patterns with robust backend logic to ensure everything works flawlessly across all devices — smartphones, tablets, smartwatches, Apple TV, and even Android TV.
I work with REST APIs, GraphQL, Firebase, Firestore, WebSockets, on-device ML, and advanced mobile architecture patterns to deliver fast, intuitive, and scalable apps.
🚀 Need help with your mobile app? You're absolutely in the right place.
1️⃣ Deep Expertise in Mobile App Development 📱
I collaborate with a strong engineering team of 50+ specialists, delivering full-cycle mobile app development — from idea validation and prototyping to UI/UX, backend architecture, QA testing, store deployment, and long-term support.
We build:
- Native iOS apps (Swift, SwiftUI, Objective-C)
- Native Android apps (Kotlin, Java, Jetpack Compose)
- Cross-platform apps (Flutter, React Native, KMM)
- Custom backend systems
- AI-powered mobile features and automation tools
Whether you’re building an MVP or scaling a mature product — we’ve got you covered.
2️⃣ Accelerated Time to Market ⏱⚡
- We deliver apps 30–50% faster than most teams thanks to:
- Agile workflows (Scrum/Kanban)
- CI/CD automation
- Reusable architecture patterns
- Parallel development (iOS + Android + backend)
- Faster launch = stronger competitive advantage.
3️⃣ Expert Mobile Technologies 🛠️
- Swift, SwiftUI, Objective-C
- Kotlin, Java, Jetpack Compose
- Flutter, Dart
- React Native, TypeScript
- Firebase, Firestore, AWS, Node.js, Python, Django
- AI/ML integrations
Performance, responsiveness, clean code — no compromises.
4️⃣ Exceptional UI/UX Interfaces 🎨
- As a mobile UI/UX designer, I create:
- Elegant iOS & Android app designs
- Smooth animations (SpriteKit, Lottie)
- Pixel-perfect layouts
- Intuitive flows aligned with user psychology
- Brand-consistent visuals (logo design, branding, Illustrator work)
We design with purpose — not just pretty screens.
5️⃣ Scalable Back-End Architecture 🗄️
Your backend is the backbone.
Our backend expertise includes:
- Node.js, TypeScript
- Django, Python
- Laravel, PHP
- GraphQL & REST APIs
- AWS / GCP / Azure / Serverless
- Firestore, SQL, NoSQL
We ensure flawless performance, even under heavy load.
6️⃣ AI-Powered Mobile Applications 🤖
I integrate:
- ChatGPT & LLMs
- Custom ML models
- Recommendation engines
- Predictive analytics
- Computer vision tools
- Voice & NLP processing
Your app becomes smarter, more personal, and more efficient.
💼 Tech Stack Overview
Android: Kotlin, Java, Jetpack Compose, Android Studio
iOS: Swift, Objective-C, SwiftUI, RxSwift
Cross-Platform: Flutter, Dart, React Native, KMM
Backend: JavaScript/TypeScript, Node.js, Django, Python, GraphQL, REST API, AWS, SQL
Frontend: React, Redux, Vue, MUI, Vuetify
Also: branding, UI/UX, DevOps, CI/CD, QA testing, and store publishing.
Highlighted Skills
android, android developer, android kotlin, android app, reverse engineering (android), android tv app, android/ios smartphone apps, ios, ios developer, ios app, ios ui design, ios marketing, swift, swiftui, app developer, mobile app development, mobile app design, mobile ui ux designer, mobile game developer, cross-platform mobile development, hybrid app development, react, react developer, react native, react native mobile, react typescript, frontend react, backend, backend developer, node, javascript, typescript, firebase, firestore, firebase analytics, react + firebase, python, python developer, machine learning, data scientist, django, kotlin, kotlin developer, kotlin android, kotlin multiplatform, java, flutter, jetpack compose, compose (android), full stack developer, web developer, web design, web designer, branding, logo design, illustrator, wordpress, shopify, laravel, blockchain, apple watch, watchkit, spritekit, watchOS development, tv app, qa testing, app tester, ceros, synology, semrush, upload products
💬 Feel free to message me here on Upwork —
I’ll be happy to discuss your project, suggest solutions, and help you bring your vision to life.
Regards, Valerii
📆 Last Updated: 12/15/2025
Steps for completing your project
After purchasing the project, send requirements so Valerii can start the project.
Delivery time starts when Valerii receives requirements from you.
Valerii works on your project following the steps below.
Revisions may occur after the delivery date.
1️⃣ Discovery & Planning
2️⃣ Design & Prototyping