Nazar S. — Senior Full-stack JavaScript Engineer

Vetted expert in Full Stack Web.

Last verified on May, 2026

Senior

Upper-Intermediate English

Core Skills

Bio Summary

Senior Full-Stack engineer with 6+ years of expertise in SAAS, finance, e-learning, gambling, and e-commerce domains.
Strong in Node.js, TypeScript, Next.js, React, React Native; builds scalable architectures, real-time features (Firebase), and REST/GraphQL APIs.
Hands-on with CI/CD, Docker, AWS/Vercel, and state management (Redux, Zustand, Vuex).
Master's in Computer Science from Lviv Polytechnic National University (Ukraine); applies clean code and modular design.
Skilled in cross-team collaboration, Jest test coverage, and responsive UI with Material UI, Tailwind, and CSS preprocessors.

Technical Skills

Programming Languages	JavaScript, TypeScript
JavaScript Frameworks	Express, Ext JS, Next.js, Node.js, React, Vue.js
.NET Platform	Identity Server
JavaScript Libraries and Tools	React Context, React Native, React Query, Redux, Redux-Saga, Styled components, Vuex, Webpack, Zustand
PHP Frameworks	Symfony
Security	Auth0
Data Analysis and Visualization Technologies	MapReduce
Databases & Management Systems / ORM	AWS ElasticSearch, Elasticsearch, Firebase, Firebase Realtime Database, MongoDB, PostgreSQL
UI Frameworks, Libraries, and Browsers	Ant Design, Chakra UI, CSS, Material UI, SASS, SASS/SCSS, Styled components, Tailwind CSS, UI
Cloud Platforms, Services & Computing	AWS, Firebase, Vercel
Amazon Web Services	AWS ElasticSearch
Google Cloud Platform	Firebase Authentication, Firebase Realtime Database
Industry Domain Experience	e-commerce, Gambling & Betting, SAAS
SDK / API and Integrations	API, Context API, Fetch API, Google Maps API, GraphQL, JWT, OAuth, RESTful API
QA, Test Automation, Security	Authentication, Jest
Deployment, CI/CD & Administration	Axios, CI/CD, GitLab CI
Version Control	BitBucket, Git, Gitflow, Github Actions, Git submodules
Virtualization, Containers and Orchestration	Docker
Mail / Network Protocols / Data transfer	JWT, WebSockets
Web/App Servers, Middleware	Nginx
UI/UX/Wireframing	Responsive Design, UI/UX
Methodologies, Paradigms and Patterns	REST, State management
Other Technical Skills	Data Management, Preprocessors, test coverage

Work Experience

Senior Full-Stack Developer (personal finance management SAAS platform)

Duration: 2024 – present

Summary:

The platform includes secure user authentication, real-time collaboration, and location-based services
Developed full-stack web and mobile applications for personal finance management and travel planning platforms using modern JavaScript frameworks and scalable architecture

Responsibilities:

Designed and implemented scalable architecture for personal finance management and travel planning platforms
Integrated Firebase Authentication for secure user access and session management
Built real-time collaboration features using Firebase Realtime Database
Implemented Google Maps API for location-based services and travel itinerary features
Developed full-stack web and mobile applications using React, React Native, and Node.js
Developed responsive, mobile-first UI with optimized performance and Webpack bundling
Worked with REST and GraphQL APIs for efficient data exchange between client and server
Participated in CI/CD setup and deployment to Vercel and AWS environments

Technologies: React, React Native, TypeScript, Vue.js, Vuex, Node.js, Express.js, Redux, Next.js, GraphQL, Firebase, MongoDB, PostgreSQL, Webpack, Docker, AWS, Vercel, Git

Senior Full-Stack Developer (Social, Gambling, and E-learning platform)

Duration: 2022 – 2024

Summary: Developed web and mobile functionality for social media, e-learning, and customer support products, including live updates, course management, quizzes, video streaming, and optimized search features to enhance user engagement and learning experience.

Responsibilities:

Implemented new gambling game features and interactive interfaces using React.js and Next.js
Maintained and refactored legacy components to improve performance and reliability
Collaborated with backend developers on Symfony APIs and plugins for data management
Increased test coverage and optimized CI/CD pipelines
Designed internal UI libraries and reusable components for consistency across the platform

Technologies: React, TypeScript, Node.js, Vue.js, Express.js, Redux, GraphQL, WebSockets, Docker, Elasticsearch, Webpack, SASS, Jest, Git, Nginx

Senior Full-Stack Developer (E-commerce platform)

Duration: 2020 – 2022

Summary: Contributed to frontend development of e-commerce, analytics, reporting, and SaaS management solutions, focusing on UI performance, responsiveness, and scalable frontend architecture to improve user experience and operational efficiency.

Responsibilities:

Redesigned and improved e-commerce platform UI with focus on performance and responsiveness
Optimized React components and API calls to reduce page load time and improve UX
Developed customer dashboard with real-time analytics and reporting features
Built SaaS management dashboard for client and project tracking systems
Integrated GraphQL APIs for efficient data fetching and state management
Improved application architecture and maintained scalable frontend codebase
Participated in UI/UX improvements and design implementation using Material UI and Tailwind CSS

Technologies: React, TypeScript, JavaScript, Redux, Context API, GraphQL, REST APIs, Tailwind CSS, Material UI, Webpack, Git, Jest

Education

Master’s degree, Computer Science
Lviv Polytechnic National University
2021 – 2022
Bachelor’s degree, Computer Science
Lviv Polytechnic National University
2017 – 2021

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