Ihor Kurinnyi

Full Stack Engineer focused on delivering clean, efficient, and maintainable solutions to complex technical challenges. I approach problem-solving with analytical thinking and strong attention to detail, aiming to build systems that are scalable, reliable, and easy to understand. I value simplicity in design and believe clear, well-structured code is essential for long-term success.

I prioritize quality and sustainability throughout the development process. Whether working on complex features or routine tasks, I maintain consistency, responsibility, and high standards. I am comfortable taking ownership from concept to implementation, ensuring solutions are practical, stable, and aligned with business goals.

I also value collaboration and knowledge sharing, with experience mentoring junior developers and contributing to a positive team environment. Outside of work, I enjoy photography and dance — creative outlets that strengthen my focus, discipline, and attention to detail.

Work Experience

November 2023 — October 2024

Senior Fullstack Developer | Opacity Labs

Led development of backend infrastructure and platform integrations, reverse-engineered WebAPIs, and optimized cross-platform solutions using React Native, React.js, and Node.js. Improved system performance, reliability, and scalability for enterprise-level applications.

February 2022 — October 2023

Senior Frontend Developer | DIMO

Designed, implemented, and maintained the core mobile application with React Native, enhancing user experience, performance, and stability. Collaborated closely with backend and QA teams to ensure seamless feature delivery.

September 2017 — January 2022

Senior Fullstack Developer | Chattermill

Delivered end-to-end development of the main web application and product integrations, implemented automation systems, and developed private APIs with React.js, Ruby on Rails, and ElasticSearch. Improved platform scalability, efficiency, and reliability.

September 2016 — August 2017

Senior Fullstack Developer | Roomchecking

Built and maintained web and mobile applications for the hotel business ecosystem, including reservation management, maintenance tracking, and a cross-integrated chat solution. Streamlined operations and improved user experience across devices.

June 2016 — September 2016

Senior Frontend Developer / Team Leader | NCube (Venture.co)

Enhanced frontend architecture, SEO, and design quality, while leading collaboration with backend developers. Optimized application performance and maintainability, improving overall delivery efficiency.

May 2015 — May 2016

Senior Frontend Developer | Roomchecking

Developed a comprehensive dashboard interface, offline functionality, mobile apps, and Pusher.io integrations. Increased user engagement and improved operational efficiency through responsive and reliable frontend solutions.

November 2015 — December 2015

Full-Stack Web Developer | TecSynt (Face to Face)

Developed a WebRTC-based video consultation platform with integrated social features and chat functionality. Delivered a robust real-time communication system supporting high-quality video and smooth user interactions.

October 2015 — December 2015

Full-Stack Web Developer | John Dow (YourGrapevine)

Implemented a complex search system, Google Maps integration, file upload capabilities, and image processing workflows. Improved platform usability and performance, enabling richer user experiences.

December 2014 — May 2015

Full-Stack Web Developer | Magtuner SA

Built a collaborative magazine editor with undo/redo functionality and RSpec testing. Improved team collaboration and content creation efficiency through reliable and maintainable features.

June 2014 — December 2014

Full-Stack Web Developer | Zamepage

Developed a document-sharing web application with robust UI, backend logic, and testing. Ensured secure and smooth document management for end users.

December 2013 — June 2014

Full-Stack Web Developer | Bongo R&D (Mapidy)

Contributed to a collaborative task management system with tree-based visualization, RSpec testing, and ElasticSearch integration. Enhanced productivity and search efficiency within the platform.

Technical Skills

> Ruby

Language

Backend development, OOP, TDD

11+

years of experience

> JavaScript

Language

Frontend & backend development, SPA, Web APIs

11+

years of experience

> TypeScript

Language

Typed JavaScript, scalable frontend architecture

years of experience

> React.js

Framework

SPA development, state management, integrations

years of experience

> React Native

Framework

Cross-platform mobile application development

years of experience

> Ruby on Rails

Framework

REST APIs, backend systems, RSpec testing

years of experience

> Ember.js

Framework

SPA architecture, Ember-data

years of experience

> Node.js

Backend

Web services, WebRTC, API development

years of experience

> ElasticSearch

Database

Full-text search, indexing, data automation

years of experience

> PostgreSQL

Database

Relational database design and optimization

years of experience

> MongoDB

Database

NoSQL data modeling

years of experience