VITALIY HRYBINYK

Senior Full-Stack Developer

.NET · React · TypeScript · PostgreSQL

Ukraine

linkedin.com/in/grybinykvitalii

PROFILE

Senior Full-Stack Developer with 10+ years of commercial software development experience.

I build complete web products using ASP.NET Core, React, TypeScript and PostgreSQL — from architecture and database design to frontend development, integrations and deployment.

Experienced in SaaS, CRM, eCommerce, IoT, real-time systems, internal business platforms, mobile applications and third-party integrations.

I can join an existing project, fix technical and architectural problems, or develop a product from scratch.

MAIN STACK

Backend: C#, .NET Core, ASP.NET Core, Web API, Entity Framework Core, SignalR, Node.js
Frontend: React, TypeScript, JavaScript, MobX, Redux, Material UI, SCSS
Databases: PostgreSQL, MS SQL, MySQL, SQLite
Infrastructure: Docker, Azure, Azure Functions, CI/CD, Git
Additional: React Native, Electron, Next.js, Sitecore, WebSockets, IoT Hub, AI/LLM integrations

SERVICES

• Full-stack web application development

• ASP.NET Core backend development

• React and TypeScript frontend development

• SaaS, CRM and admin panel development

• REST API development and integration

• PostgreSQL and MS SQL database design

• Authentication and authorization

• SignalR and real-time functionality

• Third-party API and payment integrations

• Bug fixing and legacy code modernization

• Performance and SQL optimization

• Docker and CI/CD configuration

• React Native and Electron applications

FREELANCE & PRODUCT PROJECTS

VeridiTarot — Founder & Full-Stack Developer

2023–Present

Private digital Tarot reflection platform focused on guided self-analysis, journaling and personalized card interpretations.

• Designed and developed the complete product architecture

• Built React frontend and ASP.NET Core backend

• Designed PostgreSQL data model and user history system

• Implemented card spreads, session journals and reusable templates

• Built AI-powered interpretation and narrative analysis workflows

• Developed subscription, payment and Telegram Mini App foundations

• Implemented multilingual support and privacy-focused user flows

• Created Docker-based microservice infrastructure

Stack: ASP.NET Core, React, TypeScript, PostgreSQL, Docker, AI/LLM integrations, Telegram Mini Apps

SSW — Social Selling Workspace

2025–Present

Mobile-first operational platform for MLM distributors that combines CRM, content management, communications, analytics and daily workflow recommendations.

• Built CRM for leads, clients, partners, notes and follow-up actions

• Developed daily priority recommendations based on user activity

• Implemented MLM network structure and distributor performance data

• Built content editor, versioning, moderation and public Content Hub

• Developed lead attribution from social media links and published content

• Implemented compliance checks for claims, prices and advertising materials

• Built Telegram, Viber and internal SignalR communication foundations

• Created isolated ERSAĞ integration for authentication, catalogue and network synchronization

• Designed modular monolith architecture with separated business domains

• Implemented Ukrainian, Russian and English localization

• Designed simplified mobile UX for users aged 40–65

Stack: ASP.NET Core, .NET 10, React, Next.js, TypeScript, PostgreSQL, MobX, SignalR, Docker

COMMERCIAL EXPERIENCE

Mapleton Hill — Senior Full-Stack Developer

02/2022–Present

Worked on SaaS, CMS, agricultural management and IoT-related systems.

• Developed backend services and React applications

• Built React Native mobile applications

• Designed scalable client-server communication

• Improved application architecture and performance

• Worked with Sitecore, Azure Functions and CI/CD

Stack: .NET Core, React, TypeScript, React Native, Node.js, Azure, Sitecore

Varyence — Full-Stack Developer

04/2021–01/2022

Developed a smart sports equipment platform with real-time training data visualization.

• Designed backend architecture and device communication protocols

• Developed React and React Native applications

• Integrated Azure IoT Hub

• Created device simulators for development and testing

Stack: .NET 6, ASP.NET Core Web API, React, React Native, MobX, Azure IoT Hub

Harward Media — Full-Stack Developer

12/2020–04/2021

Worked on a high-load eCommerce platform.

• Developed administration functionality

• Optimized backend workflows and database queries

• Implemented A/B testing

• Integrated Google Ads and Facebook Ads APIs

Stack: .NET Core, Entity Framework Core, React, PostgreSQL, MobX, Azure DevOps

EPAM — Software Engineer

12/2019–08/2020

Worked on a monitoring and control system for oil drilling operations.

• Developed and improved UI components

• Extended monitoring functionality

• Implemented and optimized unit tests

Stack: WPF, ASP.NET, MS SQL, Oracle, Azure DevOps, IoT Hub

Limestone Digital — Full-Stack Developer

01/2019–10/2019

Worked on an internal management system for the International Ice Skating Union.

• Led frontend development with React and TypeScript

• Integrated SignalR for real-time communication

• Extended backend APIs

• Conducted team knowledge-sharing sessions

Stack: React, TypeScript, MobX, ASP.NET Core Web API, Entity Framework Core, SignalR

Gamanet — .NET Developer

02/2017–10/2018

Worked on security systems for airports, hotels and business centres.

• Developed drivers for security and IoT devices

• Improved communication protocols and reliability

• Implemented and tested device integrations

Stack: .NET, WPF, Workflow Foundation, SVN, Mercurial

Luxoft — Software Developer

09/2016–02/2018

Worked on automotive embedded systems for navigation and event tracking.

• Integrated navigation and event-processing systems

• Developed multithreaded components

• Improved application performance

Stack: C++, Qt, Git, multithreading, embedded systems

Aquarium Co. — Embedded Developer

06/2014–06/2016

Developed IoT systems for aquarium lighting and ecosystem control.

• Developed firmware for Atmel microcontrollers

• Designed and tested circuit boards

• Integrated Raspberry Pi and smart-home systems

Stack: Atmel, C/C++, Raspberry Pi, Fibaro

EDUCATION

IT STEP Computer Academy
Software Development, 2016–2018

Luhansk National Agrarian University
Master’s Degree in Veterinary Medicine, 2007–2015