Sviatoslav

PERYNSKY SVIATOSLAV

CONTACT INFORMATION
Kyiv | [открыть контакты](см. выше в блоке «контактная информация») | [открыть контакты](см. выше в блоке «контактная информация») | Telegram: @wavetoreality | [открыть контакты](см. выше в блоке «контактная информация»)

SUMMARY
Full-stack Developer with 4+ years of experience in web, mobile, and IoT systems. Proven track record in
Fintech B2B platforms and remote equipment control systems via TCP and Modbus protocols. Passionate
about advancing in Backend development (microservices, infrastructure) and Mobile development.

TECHNICAL STACK
Frontend & Mobile: React, React Native (Expo/EAS), TypeScript, Next.js, Redux Toolkit, Material UI, Reanimated
Backend: Node.js (Fastify, Express, NestJS), REST API.
Data & Real-time: MongoDB (Mongoose), Redis, WebSocket (Socket.io), TCP, Modbus
Infrastructure & Tools: Electron, Firebase Auth, Git, Docker, PM2, Postman, Swagger,
Linux (server administration), macOS / Windows

EXPERIENCE
Full-stack / IoT Developer 2025 - 2026
60dbm (Radio Electronics Manufacturer) — Project Work
Development of cross-platform software (React Native, Electron) for real-time monitoring and remote
control of high-power EME RF amplifiers based on STM32.
IoT & Real-time: Implemented data exchange via TCP sockets and Modbus; developed a real-time
telemetry visualization and device control system.
Mobile Development: Managed the full release cycle and updates for apps on App Store and Google
Play using Expo/EAS.

Full-stack Developer June 2022 - September 2024
CreditBox (Fintech / SaaS Platform)
Developed a B2B SaaS platform for the financial sector using React, Redux Toolkit, Fastify, and MongoDB.
Data Processing & Optimization: Automated import and validation of large datasets (XLSX/CSV);
implemented background tasks (Cron), Redis caching, and live updates via WebSockets.
Document Automation: Developed a system for automated PDF document package generation for
agreements and integrated digital signature services.

Frontend / Full-stack Developer May 2021 - April 2022
Freelance (Project-based work)
Developed React/Firebase admin panels, responsive landings, and custom WordPress themes.
Backend: Enhanced Node.js/Express REST APIs, managed MongoDB, and integrated notifications.

Frontend Developer November 2020 - March 2021
White & Red (Digital Agency)
Built and maintained WordPress sites: custom features, plugin integration, and theme configuration.
Improved existing projects and prepared technical instructions for clients.