Valentine

Valentyn Riabinchak
Senior Full Stack Developer
[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | Uzhhorod, Ukraine
Linkedin | CodeForces | LeetCode | HackerRank

Education

Uzhgorod National University Uzhhorod, Ukraine
Sofware Engineering Bachelors September 2020 - June 2024
GPA: 4
Experience

Sphise | Senior Frontend Engineer Remote (USA) | August 2025 - Now
Development of intelligent web systems with Agentic AI for healthcare. Built autonomous AI agents
that process requests, create appointments, and make decisions. Implemented real-time AI transcription,
context-aware dialogues, and intelligent state management systems. Development and maintenance of
web applications for a medical management system. DataTables and FullCalendar integration,
CSV/Excel export, performance optimization via debouncing and async requests. Work with React,
Alpine.js, and Laravel Echo for real-time features. Bug xes and UX improvements.
OpenPharma | Full-Stack Developer Uzhhorod, Ukraine | September 2023 - August 2025
Development of REST API based on SOA architecture using .NET Core. Design and implementation of
business logic for medical systems with React.js and Vue.js. Optimising UI and website with workers
and hooks. Refactoring and optimization of existing code, implementation of design patterns (CQRS,
Repository, Dependency Injection). Writing unit tests, covering critical paths with tests. Working with
Docker containers, RabbitMQ, Redis to build scalable services. Building integrations with internal and
external modules (including DICOM, eHealth). Support and development of solutions for
pharmaceutical companies, pharmacies and market operators.
SOFTEC | Full-Stack Developer Uzhhorod, Ukraine | March 2022 - September 2023
I was developing SPA on Angular with Backend as ASP.NET Core. Also here is mobile application on
Xamarin. I helps to do some tasks with this also. In Angular is integrated Angular Materials library and
Leaet (Map integration).
Skills

Programming Languages: C#, C++, Ruby, JavaScript, TypeScript, Python
Libraries/Frameworks: ASP.NET Core, EF Core, ADO.NET, Entity Framework Core, Xamarin Forms,
Vue.js, React.js, Angular
Tools / Platforms: Git, Bitbucket, Visual Studio, ChatGPT, Fork, GitLab, SQL Management Stu-
dio, Azure Local Storage, Figma, Jira, Agile, Scrum, Azure DevOps, Azure,
DigitalOcean, Docker, Docker Compose, Jenkins, CI/CD, GitHub Actions, Re-
dis
Databases: MS SQL Server, MongoDB, SQLite, PostgreSQL

Projects / Open-Source

| Link TypeScript, CSS, HTML
Material UI was used.
RxJS was used for getting data from API.
Also, I wrote two pipes, one for searching words in the articles and another for making matched works to
yellow colour.

| Link C#, ASP.NET Core, WebAPI, EF, MS SQL Server, JavaScript, HTML, CSS
The main purpose of this project was to make a logical structure of the bus schedule.
In the project, you can choose a bus and see its next stop. The buses are driving in cycles.

| Link C#, Docker, ASP.NET Core, WebAPI, Restful API, EF, MS SQL Server
Aim of this project was to make system that will save all data of the platform and do all functionality
connected to passing tests.
 | Link Angular, Angular Materials, TypeScript, HTML, CSS,
This project is an interface for knowledge assessment platform. It contains many including tags.

| Link C#, WPF
This project is a system for data accounting of the Pizza Restaurants. Here is monitoring product
imports and prices in the menu for selling.
Here is the calculated income for the restaurant.
Also, monitoring the spending of employers. There are their salaries in the month and then the owner
can do an analysis.

Certifications

ˆC# Professional - CyberBionic Systematics
ˆC# Certication - Microsoft
ˆIT Cluster Transcarpathia - IT_winterschool
ˆIT English - Englishdom
ˆBusiness English - Englishdom
ˆOPNU Internal Programming Contest 2023 - ODESS POLYTECHNIC NATIONAL UNIVERSITY
ˆThe 2023 ICPC Ukraine Western Contest - International Colleggiate Programming Contest
ˆHigh Performance Coding with .NET Core and C# - Udemy
ˆPython 3 Course - CODECADEMY
ˆLearn to Code with Ruby - Udemy
ˆOPNU Internal Programming Contest 2024 - ODESS POLYTECHNIC NATIONAL UNIVERSITY
ˆKnowledge assessment system "LightSide" - Scopus.
ˆDEVELOPMENT OF AN ONLINE PLATFORM FOR MONITORING THE STATE OF WATER AND
SOIL IN THE AREA - Black Sea Science