09/15/2026 updated
100 % available
Full Stack & AI Developer | React & Next | Python | C# | C | API Integration | Fintech
Kyiv (Київ), Ukraine
Worldwide
BA Computer Science, National University San Diego, CaliforniaAbout me
With 7+ years of experience in full-stack web and mobile application development, I help startups and enterprises build scalable, secure, and AI-powered applications from idea to production.
C (Programming Language)JavaScriptMobile Application DevelopmentFull Option Science SystemsHealthcare Effectiveness Data and Information SetPython (Programming Language)Visual Basic .NET (Programming Language)Next.jsThree.jsHealth and Human ServicesReact.jsGodaddyFastAPIFull Stack DevelopmentReact Native
Hello, I work closely with clients throughout the entire product lifecycle — from understanding requirements and designing the right architecture to UI/UX, development, deployment, optimization, and long-term scaling.
My focus is on building reliable, maintainable, and business-focused software rather than simply writing code. I combine modern frontend frameworks, Python and Node.js backends, cloud infrastructure, databases, APIs, and AI-assisted development workflows to turn ideas into production-ready applications.
I have worked on everything from lightweight MVPs and SaaS products to complex enterprise platforms across Healthcare, FinTech, Logistics, E-commerce, Marketplaces, Social Platforms, and Industrial Automation.
Core Expertise
Full-Stack Development
- React.js, Next.js, Angular, React Native, JavaScript, jQuery
- Python, Node.js, PHP, Laravel, CakePHP
- MySQL, PostgreSQL, MongoDB, InfluxDB
- REST APIs, Web Services, Microservices
- Scalable and secure application architecture
AI & AI-Assisted Engineering
- AI-first development workflows
- Cursor AI, GitHub Copilot, and AI coding agents
- AI-powered application features
- Integration with AI APIs and foundation models
- RAG and LLM-based applications
- LangChain and LangGraph
- AI-assisted development and automation pipelines
Cloud, DevOps & Infrastructure
- AWS architecture and deployment
- AWS Lambda, S3, CloudFront
- Serverless applications
- Cloud-based application architecture
- CI/CD and deployment pipelines
- Production deployment, optimization, and scaling
Data, Streaming & Visualization
- Highcharts and interactive data visualization
- Real-time dashboards
- InfluxDB and time-series data
- Grafana monitoring
- Kafka-based streaming pipelines
- Real-time data processing systems
Domain Experience
Healthcare Technology
- HIPAA-compliant application architecture
- Telemedicine platforms
- Clinical workflow systems
- HL7 and FHIR integrations
- EMR/EHR integrations
- Cerner APIs
- Healthcare data and API integrations
FinTech
- Payment integrations with Plaid and Dwolla
- Secure financial APIs
- Transaction and payment workflows
- Compliance-focused architecture
- Financial data processing
Industrial IoT & Automation
- SCADA systems
- PLC integration
- OPC UA, Ethernet/IP, and Modbus TCP
- Real-time machine data collection and control
- Workflow automation with n8n and Make
Additional Expertise
- Custom Slack apps and bots
- Bubble no-code/low-code development
- Secure API architecture
- Web application security
- Real-time systems
- Marketplace and SaaS platforms
- Business process automation
My approach is straightforward: understand the business problem first, choose the right technology for the job, build with clean and scalable architecture, and deliver something that can evolve as the product grows.
If you need a developer who can take ownership from an initial idea or existing codebase through development, deployment, and scaling, I’d be happy to collaborate.
Experience
Professional experience5 - 10 years
Freelancer since2016
Languages
EnglishFluent
Project history
-Developed and maintained backend services for FinTech applications focused on transaction processing, account management, and financial data workflows.
-Built RESTful APIs using Python and FastAPI, implementing business logic for transaction validation, fee calculation, pricing, and financial reporting.
-Designed and optimized SQL database structures for reliable storage and retrieval of transaction and account data
Integrated third-party payment and financial APIs to support external data and service workflows.
-Implemented AI-powered features and API integrations for financial recommendations and automated data processing.
-Worked across backend and frontend components to connect APIs with responsive web dashboards and user-facing workflows.
-Containerized applications with Docker and supported cloud-based deployment and production maintenance.
-Built backend systems and APIs for web-based financial applications, focusing on transaction management, data processing, and business-critical workflows.
-Developed scalable REST APIs with Python and FastAPI, including authentication, authorization, validation, error handling, and structured business logic.
-Implemented financial calculation logic for transaction costs, service fees, additional charges, balances, and expected returns.
-Designed SQL schemas and queries for efficient transaction processing, reporting, and account management.
-Integrated external APIs and services while maintaining consistent data handling between internal systems and third-party providers.
-Collaborated with product and development teams to translate business requirements into practical technical solutions.
-Followed Git-based development practices and maintained clean, testable, and maintainable code throughout the development lifecycle.
-Developed web applications and backend services using Python, JavaScript, SQL, and REST APIs.
-Built reusable backend components and API endpoints to support data-driven web applications.
-Worked on database design, data validation, application logic, and integration between frontend interfaces and backend services.
-Assisted with developing authentication, user management, and secure data-handling functionality.
-Implemented responsive frontend features and connected user interfaces with backend APIs.
-Participated in debugging, testing, performance improvements, and production deployment.
-Gained hands-on experience with software architecture, Git workflows, API development, and end-to-end application delivery.