You will get 1 Hour Expert Javascript Consultation to Your Web/Mobile App
Top Rated
Project details
Looking for professional Javascript consultation to enhance your web application's performance, scalability, and maintainability? Your search ends here, where years of specialized experience make us your reliable partner in everything about JS-stack development.
Our Expertise:
Custom Web Application Development: We excel in crafting robust, scalable, and maintainable JS applications tailored to your unique business.
Code Review & Optimization: We conduct comprehensive code audits to elevate the quality, structure, and performance of your existing JS applications.
Architecture Planning: Collaborating with you, we design an efficient, cost-effective, and scalable system architecture that can handle your growth.
Maintenance & Upgrades: Count on us for ongoing maintenance, feature enhancements, and full version upgrades to keep your project up to date.
Ready to elevate your Javascript project? Click "Continue" to initiate a conversation with us or send your project details for an initial consultation. Let's take your application to the next level!
Our Expertise:
Custom Web Application Development: We excel in crafting robust, scalable, and maintainable JS applications tailored to your unique business.
Code Review & Optimization: We conduct comprehensive code audits to elevate the quality, structure, and performance of your existing JS applications.
Architecture Planning: Collaborating with you, we design an efficient, cost-effective, and scalable system architecture that can handle your growth.
Maintenance & Upgrades: Count on us for ongoing maintenance, feature enhancements, and full version upgrades to keep your project up to date.
Ready to elevate your Javascript project? Click "Continue" to initiate a conversation with us or send your project details for an initial consultation. Let's take your application to the next level!
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included $60
These options are included with the project scope.
$60
- Delivery Time 1 day
- Number of Revisions 1
- Design Customization
- Content Upload
- Responsive Design
- Source Code
Optional add-ons
You can add these on the next page.
1 more hour
+$60
31 reviews
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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
React Native Developer | Mobile App Development | iOS and Android
92%
Job Success
Cascais, Portugal - 2:26 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.
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