You will get MVP App for your idea (iOS, Android, React, JavaScript)
Top Rated
Project details
Looking for web, mobile, or full-stack development for your business or startup? With more than 8 years of experience and more than 20 complex projects behind - ready to bring in Javascript expertise to build Web & Mobile apps that just get what the business wants
Key Features:
• Customized Functionality: Tailor your web app to perform precisely as your business demands, with features crafted to address your unique requirements.
• Scalability: Future-proof your digital presence with a scalable architecture, allowing your web app to grow seamlessly as your business evolves.
• Responsive Design: Guarantee an exceptional user experience across devices with a responsive design that adapts to various screen sizes, enhancing accessibility for your target audience.
• Security Measures: Prioritize data integrity and user privacy with robust security protocols, safeguarding your web app against potential threats.
• Collaborative Development: Experience a transparent and collaborative development process, with regular updates, feedback loops, and a commitment to meeting project milestones efficiently.
Key Features:
• Customized Functionality: Tailor your web app to perform precisely as your business demands, with features crafted to address your unique requirements.
• Scalability: Future-proof your digital presence with a scalable architecture, allowing your web app to grow seamlessly as your business evolves.
• Responsive Design: Guarantee an exceptional user experience across devices with a responsive design that adapts to various screen sizes, enhancing accessibility for your target audience.
• Security Measures: Prioritize data integrity and user privacy with robust security protocols, safeguarding your web app against potential threats.
• Collaborative Development: Experience a transparent and collaborative development process, with regular updates, feedback loops, and a commitment to meeting project milestones efficiently.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$30,000
|
Standard
$40,000
|
Advanced
$50,000
|
|---|---|---|---|
| Delivery Time | 40 days | 55 days | 70 days |
Number of Revisions | 3 | 5 | 7 |
Design Customization | - | ||
Content Upload | - | - | |
Responsive Design | |||
Source Code |
Frequently asked questions
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Anna D.
Dec 19, 2025
30 minute consultation
It was a great and very professional react native developer. I received detailed, practical recommendations and all the necessary documentation. Oleg is a true professional who clearly understands the topic and explains everything in a structured and helpful way. Highly recommended.
TM
Tobias Hahn M.
Dec 15, 2025
Birdie App
Amazing cooperation! Quick onboarding, GREAT project management from their side and overall really nice work.
AD
Alina D.
Oct 15, 2025
30 minute consultation
One of the best experiences I’ve had on Upwork!
AD
Alina D.
Oct 3, 2025
30 minute consultation
Great and very useful consultation!
EB
Ethan B.
Jul 7, 2025
Mobile App Development (React Native) for Social Community App
Available, lot of skills, good english and efficient and fast work. I recommend
About Oleg
Mobile App Developer| AI App Developer | iOS | Android| Cross-Platform
100%
Job Success
Cascais, Portugal - 4:24 am local time
📍 Full stack engineering for complex backend systems
📍 AI Agent Development for automation and intelligent workflows
For more than 11 years, I’ve been working in mobile app development and full stack development, delivering scalable web platforms, high-performance mobile apps, and modern AI-driven systems.
This combination allows me to build products end-to-end, from mobile UI to backend architecture and AI logic.
📱 Mobile App Development & React Native Expertise
As a React Native developer, I’ve built and scaled mobile applications used in fintech, real estate, healthcare, marketplaces, and social platforms.
My mobile app development experience includes:
- Cross-platform iOS and Android apps
- Complex user roles and permissions
- Real-time features (chat, live updates, tracking)
- High-load backend integrations
- Clean architecture designed for long-term growth
One of my key projects Breeze, a real estate mobile platform was developed end-to-end as a full stack developer and later raised $3M+ in investments.
That experience strongly shaped how I approach architecture, scalability, and product quality.
🤖 AI Agent Development & Automation
In parallel with product engineering, I focus heavily on AI Agent Development.
As an AI Agent Developer and AI Automation Expert, I design systems that go far beyond simple chatbots.
I build:
- AI agents with planner-executor architecture
- Multi-agent systems with task orchestration
- AI chatbots connected to business data
- AI automation pipelines for operations, research, and analytics
- RAG systems using embeddings and vector databases
These AI agents are designed to interact with real systems, APIs, CRMs, databases, internal tools, and operate as part of a real product ecosystem.
My goal is always the same:
turn AI from an experiment into a reliable, controllable product component.
🔗 Where AI meets Full Stack Development
What makes my approach different is the combination of:
AI Developer + Full Stack Developer + Mobile App Developer
This means:
- AI agents integrated into web platforms
- Mobile apps powered by AI logic
- Backend services managing agent execution
- Dashboards for monitoring and control
- Secure and scalable infrastructure
Instead of isolated AI tools, clients get complete AI-powered products.
💡Clients usually come to me when they need:
- A senior engineer who understands product logic
- A CTO-level partner, not just a coder
- Clean architecture from day one
- Systems prepared for growth, investment, and scale
That’s why many clients stay long-term and treat me as a technical partner, not a temporary freelancer.
Steps for completing your project
After purchasing the project, send requirements so Oleg can start the project.
Delivery time starts when Oleg receives requirements from you.
Oleg works on your project following the steps below.
Revisions may occur after the delivery date.
Project Initiation
What will be done: - Defining the project scope, goals, and objectives - Establishing communication channels - Conducting initial feasibility studies and risk assessments - Developing a high-level project plan
Planning
It includes - Creating a detailed project plan, including timelines and milestones - Defining tasks, responsibilities, and resource requirements - Establishing a system for tracking progress and managing changes