Denys B.

Denys B. — React Native Developer

Expertise in Full Stack Web (8.0 yr.), React Native (4.5 yr.).

Last verified on April 07, 2025

Core Skills

JavaScript

8 yr.

TypeScript

6 yr.

React

6 yr.

React Native

4 yr.

Node.js

4 yr.

Bio Summary

- Experienced in React Native: Developed and delivered multiple React Native mobile applications, including a KenZen App and a Furniture Design Time-Tracking App, integrating Firebase, Redux, animations, and state management. Over 4.5 years of experience with React Native - Full-Stack Development in Fintech: Led fintech real estate app development, handling both front-end (ReactJS, Styled-Components) and back-end (NodeJS, MongoDB) while managing CI/CD pipelines and real-time updates. - Senior Developer in Web & Mobile Apps: Designed and implemented scalable mobile and web applications, ensuring high code quality, debugging, and managing releases on App Store and Play Market. - Developed e-commerce web solutions using Vue and Vuex, collaborating with back-end and QA teams, - Experienced in Docker, GitHub Actions, and Linux server management, optimizing deployment pipelines and application performance. - Intermediate English

Technical Skills

Programming Languages	JavaScript, TypeScript
Mobile Frameworks and Libraries	Crashlytics
JavaScript Libraries and Tools	Expo, React Native, Redux, Redux-Saga, Redux Thunk, Styled components, Vuex, yup
JavaScript Frameworks	Node.js, React
UI Frameworks, Libraries, and Browsers	Socket.io, Styled components
Databases & Management Systems / ORM	Firebase, MongoDB
Google Cloud Platform	Firebase Hosting
Virtualization, Containers and Orchestration	Docker, Storage
Platforms	Firebase
Version Control	GitHub, Github Actions
Operating Systems	Linux
Collaboration, Task & Issue Tracking	Notion
Mail / Network Protocols / Data transfer	SMTP, TLS
Other Technical Skills	Bcrypt

Work Experience

Senior Software Engineer, Fintech Real Estate Application

Duration: October 2021 - February 2025

Summary: Senior Software Engineer developing a fintech application for real estate joint ownership and renting.

Responsibilities: Developed application architecture, selected technology stack, implemented real-time updates, managed task board, developed front-end and back-end for main app and dashboard, created a Telegram bot, handled various administrative tasks (Google Services, hosting, domains, Linux Server, etc.), and established CI/CD pipeline with GitHub and Docker.

Technologies: Typescript, ReactJs, NodeJs, Styled-Components, Atlas MongoDB, Socket.IO, SMTP, Storage, bcrypt, GitHub, Docker

Senior Software Developer, Various Mobile and Web Applications

Duration: January 2019 - January 2022

Summary: Senior Software Developer working on robust and scalable mobile and web applications and microservices.

Responsibilities: Developed and delivered mobile applications using React Native, web applications using React, and microservices using NodeJs. Managed code quality through testing, debugging, code reviews, and team management.

Technologies: React Native, React, NodeJs, App Store, PlayMarket

Middle React Native Developer, KenZen Mobile Application

Duration: July 2019 - December 2019

Summary: Middle React Native Developer on KenZen mobile app development.

Responsibilities: Developed mobile application from scratch, implemented complex routing and iOS-like animations, and managed Firebase database and video streaming services.

Technologies: React Native, Firebase, Redux, Google Services

Middle Software Developer, The Kooples Online Store Department

Duration: April 2019 - July 2019

Summary: Middle Software Developer for the online store department domain of The Kooples distributor.

Responsibilities: Developed using Vue library, managed state with Vuex, led a Junior Developer, and collaborated with back-end and QA teams.

Technologies: Vue, Vuex

Middle React Native Developer, Furniture Design Time-Tracking App

Duration: August 2018 - April 2019

Summary: Middle React Native Developer creating an application for measuring time on furniture design tasks.

Responsibilities: Created an application using Expo library for hybrid platforms, managed Redux state, developed with Firebase, tested and deployed to app stores.

Technologies: React Native, Expo, Redux, Redux-Thunk, Firebase, App Store, Google Play Market

Education

Master's Degree in International Economics

Studied at Kyiv National Economics University

September 2006 - June 2011

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