About Me
Get to know more about my background, skills, and passion for development
I'm a Full Stack Web & Mobile Developer specializing in modern web apps, Telegram Mini Apps, and blockchain-integrated platforms. I build scalable, user-focused solutions using React, Next.js, TypeScript, and Node.js — seamlessly connecting web experiences with mobile technologies like React Native and Expo. My recent work includes integrating Telegram SDK and TON Connect for real-time interaction, payments, and community-driven ecosystems. Passionate about clean architecture, teamwork, and creating products that truly engage users.
Soft Skills
Education
Lawyer (Qualification in Criminal Police)
Kharkiv National University of Internal Affairs
2004–2008
Additional Education
- Full Stack Developer — IT School GoIT (July 2020 – July 2021, Ukraine)
Skills & Technologies
Technologies and tools I work with to bring ideas to life
Frontend
Mobile Development
Backend & Integration
Testing & Quality
Tools & Workflow
Professional Experience
Full Stack Web & Mobile Developer
2021 – PresentCyberLeaf
Developing modern web and mobile applications with focus on performance, scalability, and UI/UX quality. Responsible for implementing new features, maintaining production apps, and improving front-end architecture using React, Next.js, and TypeScript. Collaborated within Agile teams, integrating Firebase, REST APIs, and PWA technologies.
- Built and maintained several production-level web and mobile apps using React, Next.js, and React Native
- Integrated Firebase, WebSocket, and REST API services for real-time communication and data synchronization
- Contributed to the development of internal tools improving project delivery efficiency
- Optimized applications for SEO and performance, achieving Lighthouse scores of 90+
Full Stack Developer / Consultant
Dec 2024 – PresentFreelance Projects
Working with international and local clients to deliver custom full stack web and mobile solutions. Focused on Telegram Mini Apps, PWA development, SEO optimization, and technical debugging for existing codebases.
- Developed and launched the SUP.port PWA — a bilingual booking platform for SUP board rentals in Cherkasy
- Created GrinG — a Telegram Mini App integrating TON blockchain payments, rewards, and community investment features
- Built Asparagus Store — a localized e-commerce platform with responsive design, recipes, and Google Maps integration
- Provided debugging, refactoring, and SEO optimization for multiple client projects
- Contributed to a humanitarian Expo-based app aiding bomb disposal specialists in identifying and neutralizing explosive devices
What Clients Say
Testimonials from satisfied clients and collaborators
"Serhii delivered an exceptional React application that exceeded our expectations. His attention to detail and technical expertise made the development process smooth and efficient."
Sarah Johnson
Product Manager
TechCorp
"Working with Serhii was a game-changer for our project. He transformed our ideas into a beautiful, functional web application that our users love. Highly recommended!"
Michael Chen
Startup Founder
InnovateLab
"Serhii's technical skills and collaborative approach made our design-to-development handoff seamless. The final product was pixel-perfect and performant."
Emily Rodriguez
Design Director
CreativeStudio
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