Sergii B.
Verified expert
Top skills
Sergii B.
Verified expert
Meet Sergii ✨
A Full Stack Developer with over three years of experience building high-performance web applications using Python, Java, and modern JavaScript frameworks. Sergii specializes in developing scalable backend systems, real-time applications, and responsive user interfaces powered by modern architectures and cloud infrastructure.
He has strong experience working across both backend and frontend, using technologies like FastAPI, Spring Boot, React, and Next.js. His work includes building microservices, implementing real-time communication with WebSockets and SSE, and integrating third-party services such as Stripe, OpenAI, and mapping APIs.
Sergii has contributed to large-scale platforms including data classification systems and high-traffic information portals with millions of pages. He focuses on API integrations, performance optimization, UI/UX improvements, and building maintainable architectures that support scalability and long-term growth.
If you need a developer who can build scalable full-stack systems, implement real-time features, and deliver reliable web applications using modern technologies, Sergii is ready to support your product development 🚀
Download the CVHard skills
Python
Java
JavaScript
TypeScript
FastAPI
Flask
Spring Boot
Hibernate
React
Next.js
Redux
RTK Query
MobX
HTML
CSS
Sass
Tailwind CSS
Material UI
Bootstrap
REST APIs
WebSockets
SSE
SQL
PostgreSQL
MySQL
MongoDB
Redis
Docker
AWS
GitHub Actions
CI/CD
Auth0
OpenAI API
Stripe
Google Maps API
Mapbox
Leaflet
Chart.js
Axios
Socket.io
Tools
Git
GitHub
GitLab
VS Code
PyCharm
JetBrains Tools
Postman
Soft skills
Problem solving
Communication
Team collaboration
Adaptability
Responsibility
Analytical thinking
Attention to detail
Continuous learning
RAG System for Information Classification
Full Stack Developer
Project Description:
Developed a system for classifying user-provided data based on predefined rules. The solution included both backend logic and frontend interfaces, with a focus on usability and real-time data processing.
Tools & Technologies:
Python, FastAPI, React, TypeScript, Redux, Axios, RTK Query, Material UI, SSE, PostgreSQL, Docker.
European Information Platform (Webia & Infocheck)
Full Stack Developer
Project Description:
Built and maintained a large-scale information platform containing over 15 million pages. The system provides detailed data about European companies and individuals, requiring high performance and scalability.
Tools & Technologies:
Python, FastAPI, Next.js, TypeScript, Redux-Saga, WebSockets, PostgreSQL, Docker, Auth0, Chart.js.