Mobile App Development
Cross-platform iOS & Android apps with Flutter and React Native. Native performance, beautiful UI, offline-first architecture.
- Flutter / React Native
- iOS & Android
- Offline Support
- App Store Deployment
Ready for Innovation
YURII KRAVCHUK
Senior Full-Stack Developer
I am a Senior Full-Stack Developer with 10+ years of experience building web, mobile, and cloud applications. I also work with AI systems, LLM integrations, and automation tools to help businesses work faster and smarter. I help startups and companies turn ideas into real products, building complete systems — frontend, backend, databases, cloud infrastructure, and AI-powered features.
Lviv, Ukraine 10+ Years Experience
Services
What I Can Build For You
From mobile apps to AI-powered solutions, I deliver end-to-end development services tailored to your business needs.
Native Android Development
High-performance native Android applications with modern architecture patterns and Material Design principles.
- Kotlin / Java
- Jetpack Compose
- Material Design
- Play Store Ready
Web Application Development
Fast, responsive web apps with React and Next.js. SEO optimized, mobile-friendly, and built for scale.
- React / Next.js
- TypeScript
- SEO Optimized
- Responsive Design
AI & Machine Learning
Intelligent systems using LangChain, RAG pipelines, and local LLMs. Turn your data into actionable insights.
- LangChain / RAG
- Local LLMs
- Custom AI Agents
- API Integration
Agentic AI Solutions
Autonomous AI agents that automate complex workflows, handle multi-step tasks, and integrate with your existing systems.
- Workflow Automation
- Multi-Agent Systems
- Business Process AI
- Custom Integrations
System Architecture
Scalable, maintainable system design. Clean architecture, microservices, and best practices for long-term success.
- Clean Architecture
- Scalable Design
- API Design
- Code Reviews
About Me
Who I Am
I am a Senior Full-Stack Developer with 10+ years of experience building web, mobile, and cloud applications. I also work with AI systems, LLM integrations, and automation tools to help businesses work faster and smarter.
I help startups and companies turn ideas into real products. I build complete systems — frontend, backend, databases, cloud infrastructure, and AI-powered features.
I work with modern frontend technologies including React.js, Next.js, Angular, Vue.js, Tailwind CSS, and Bootstrap, and I build responsive, high-performance user interfaces. I also create data visualization features using D3.js and develop applications that use GraphQL and Apollo.
For mobile development, I build cross-platform and native apps using React Native, Flutter, Swift for iOS, and Java or Kotlin for Android.
On the backend, I develop scalable systems using Node.js with Express and Nest.js, Python with FastAPI, and PHP with Laravel. I design REST APIs and GraphQL APIs, and I implement authentication systems and application security.
I also have strong experience with AI, LLM, and automation. I integrate OpenAI and other LLM APIs, build AI chat features, create AI content generation systems, develop workflow automation, and add AI-powered features into SaaS products. I work with data processing pipelines, bots, and task automation systems.
For databases, I use PostgreSQL, MySQL, MongoDB, Firebase, and Supabase, depending on project needs.
In cloud and DevOps, I work with AWS, CI/CD pipelines, deployment processes, server setup, and performance optimization.
I also write tests using Jest and Cypress, design system architecture, and build real-time features. I have additional experience with Unity for interactive and 3D applications.
Portfolio
Featured Projects
A selection of projects I've built that showcase my expertise in mobile development, web applications, and AI integration.
Web / B2B E-commerce
B2B E-commerce Platform
HAZEL refers to a cloud-based online B2B e-commerce platform that helps businesses sell products and services to other businesses through a digital portal. In this setup, business buyers can log in, browse catalogs, place orders, and manage purchases directly online - similar to how a typical online store works for consumers, but tailored to the needs of professional buyers and sellers.
B2B E-commerce
Inventory management
Order taking
Real-time analytics
ReactNext.jsTypeScriptTailwind CSSPostgreSQLNode.jsDockerCI/CD
Web / Assistant
Astar
Astar is a digital ecosystem that blends symbolic insights and personal reflections with automated tools and real human support to provide meaningful guidance and interactive experiences in one unified platform.
Symbolic insights
Personal reflections
Automated tools
Real human support
ReactNext.jsTypeScriptTailwind CSSPostgreSQLNode.jsOpenAIPythonFastAPI
Web / Business Texting
Statxt
Statxt is a business texting platform for teams.The goal is to let businesses message customers reliably over SMS/MMS. with a fast inbo for daily conversations and support for campaigns and automation, while keeping compliance and deliverability central (opt-out, consent, auditing, guardrails).
Business texting
Campaigns
Automation
Compliance
Deliverability
ReactNext.jsTypeScriptTailwind CSSPostgreSQLNode.jsDockerCI/CDPythonFastAPIVonage
Web / Healthcare
Healthcare Management Platform
Healthcare website for the Center of Modern Urology in Kyiv, providing information about doctors, diagnostics, treatments, and clinic locations for patients.
Doctors directory
Diagnostics & treatments
Multilingual content
Clinic locations & contacts
HealthcareReactNext.jsSEOResponsive UITypeScript.NETTailwind CSSPythonPostgreSQLDockerCI/CD
Mobile / Shopping
Cross-Platform E-Commerce App
Family fashion marketplace app for iPhone, built around Shafa.ua. Browse discounted branded clothing, follow favorite brands, use powerful filters, and buy & sell safely with secure payments.
Brand subscriptions
Advanced search & filters
Safe payments
Order tracking
React NativeiOSShoppingSecure PaymentsPush Notifications
Marketplace / E-commerce
Ecommerce / Marketplace
Online marketplace focused on fashion and lifestyle: browsing categories, discounts, new arrivals, brand discovery, and a feed-style shopping experience.
Catalog & categories
Discounts
New arrivals
Brand pages
User listings
E-commerceReactMarketplaceCatalogEmotionCloudflareTypeScript.NETTailwind CSSPythonCI/CD
Mobile / Medical
Health24 for Patients
Medical online service app for booking doctor appointments and managing personal medical records. Integrates with e-Health Ukraine system, allowing patients to access electronic medical cards, prescriptions, vaccination data, and lab results directly from their smartphone.
Doctor booking
Medical records
e-Health integration
Family accounts
React NativeiOSMedicale-HealthAppointments
Web / Real Estate
LUN Real Estate Platform
Ukrainian real estate platform for finding new builds, apartments, houses, and commercial properties for sale or rent across major cities. Provides detailed project info, developer profiles, and market statistics to help users make informed decisions.
New builds & resale
Rent & sale
Developer catalog
Market analytics
ReactNext.jsMapsAnalyticsSearchTypeScript.NETTailwind CSSPythonPostgreSQLDockerCI/CDFastAPI
Desktop Application / Restaurant
Restaurant POS System
Restaurant POS system for managing restaurant operations, including inventory, orders, payments, and reporting. Features include table management, order taking, payment processing, and real-time analytics.
Inventory management
Order taking
Payment processing
Real-time analytics
ReactTypeScriptTailwind CSSSQliteSocket.ioElectronNode.js
Technical Skills
Technologies I Work With
My technical toolkit spans mobile development, web technologies, and AI/ML systems.
Frontend
React95%
Next.js95%
Angular85%
Vue.js85%
TypeScript95%
JavaScript95%
Tailwind CSS95%
Bootstrap90%
D3.js85%
GraphQL85%
Apollo85%
HTML595%
CSS395%
Material UI85%
Three.js85%
Backend
Node.js95%
Express.js95%
NestJS90%
Python90%
FastAPI90%
Django85%
PHP85%
Laravel85%
.NET90%
ASP.NET Core90%
C#90%
REST APIs95%
GraphQL APIs85%
JWT Authentication95%
Socket.io85%
Mobile
React Native95%
Flutter90%
Swift85%
Kotlin85%
Java85%
AI & Automation
OpenAI90%
LLM Integration90%
AI Chat Systems85%
Workflow Automation85%
LangChain85%
Databases
PostgreSQL95%
MySQL90%
MongoDB95%
SQL Server90%
Firebase90%
Supabase85%
Redis85%
SQlite90%
DevOps & Cloud
AWS90%
CI/CD Pipelines90%
Docker90%
GitHub Actions90%
GitLab CI/CD85%
Nginx85%
Vercel90%
Cloudflare85%
Career
Professional Experience
My journey building software products and leading development teams.
Current Position
Full Stack Engineer
NovaTech Solutions
01/2021 – 01/2024
Lviv, Ukraine | Remote
Delivered scalable web applications and end to end product features, collaborating with cross functional teams to turn business needs into reliable software.
- Built full stack platforms using modern frontend frameworks and backend services
- Designed REST APIs and optimized database performance for high traffic systems
- Improved application performance and maintainability through clean architecture practices
- Contributed to product planning, technical decisions, and mentoring developers
ReactNext.jsVue.jsAngularTailwind CSSTypeScriptNode.jsExpress.jsPostgreSQLMongoDB
Mobile | Backend Developer
DigitalCore Systems
03/2018 – 12/2020
Lviv, Ukraine
Focused on mobile integrations and backend services development using Microsoft technologies.
- Developed secure backend APIs in .NET supporting mobile applications
- Implemented authentication, data synchronization, and scalable cloud services
- Collaborated with mobile teams to deliver stable and performant app features
- Optimized backend logic improving response time and reliability
.NETASP.NET CoreC#REST APIsSQL ServerMobile Integrations
Mobile | Frontend Developer
ByteWave Studio
06/2015 – 02/2018
Lviv, Ukraine
Worked on mobile focused UI development and responsive frontend applications.
- Built mobile friendly interfaces and reusable UI components
- Improved user experience through performance optimization and modern design practices
- Integrated frontend apps with backend APIs and third party services
- Collaborated closely with designers to ensure consistent UX across devices
React NativeFlutterKotlinJavaScriptTypeScriptHTMLCSSFirebase
Backend Developer
CodeBridge Technologies
04/2013 – 05/2015
Lviv, Ukraine
Developed enterprise level backend systems using Microsoft .NET technologies.
- Designed and maintained backend services using .NET and C#
- Built scalable APIs and business logic for internal platforms
- Improved system stability through refactoring and performance tuning
- Participated in architecture discussions and code quality initiatives
.NETASP.NET MVCC#SQL ServerREST APIsNode.jsExpress.jsMongoDBPostgreSQL
Growth
Currently Exploring
Mobile
React Native, Flutter
Cloud Architecture
AWS, GCP, Serverless
Performance
System optimization
Full Stack
React, Node.js, Python
Education
Academic Background
Master of Software Engineering
Ivan Franko National University of Lviv
Lviv, Ukraine
09/2013 – 12/2015
Bachelor of Computer Science
Lviv Polytechnic National University
Lviv, Ukraine
09/2009 – 06/2013
Languages & Certifications
Communication & Achievements
UkrainianNative
EnglishFluent
.NET Development & ASP.NET Core
Skills: .NET, ASP.NET Core, C#, REST APIs, SQL Server
Node.js: Creating a REST API with Express and MongoDB
Skills: Back-End Development, Node.js, Express.js, MongoDB
Application Manufacturing - React Native
Skills: React, React Native, Node.js, TypeScript, Firebase, Git
Philosophy
Why Work With Me?
"I build software that is powerful inside, delightful outside, and purposeful always."
Quality First
Clean code, tested thoroughly, built to last
Fast Delivery
Efficient workflows, clear communication
User-Centric
Beautiful UX that users actually enjoy
I build systems that scale and evolve with your business.
10+
Years Experience
60+
Projects Delivered
50+
Happy Clients
500+
Healthcare Users