Hi, I am Nazarii Semeniuk

I'm a FullStack Developer with 5+ years of experience in web development. I'm passionate about building excellent software that improves the lives of those around me.

Work Experience

Frontend Developer

Billtech

Vinnytsia

Oct 2023 - Present

Product company focused on building new features/products and improving existing experiences.

Key Responsibilities

  • Developing new features and maintaining existing functionality
  • Conducting code reviews for a sub-product
  • Interviewing new candidates with the Team Lead
  • Collaborating with cross-functional teams to define and implement new features

Achievements

  • Built and maintain a UIKit from scratch for a new sub-product
  • Improved production pipeline, significantly reducing post-release issues
  • Developed a custom sitemap module replacing the official one due to performance issues
  • Significantly improved SEO for the product
  • Developed a Telegram Mini App with full product ecosystem integration
  • Integrated testing frameworks to enhance code quality and reliability
VueNuxtTypeScriptJavaScriptWebSocketsi18nVitestPiniaTelegram Mini App

FullStack Developer

Atlasiko Inc.

Vinnytsia

Jun 2021 - Oct 2023

Hybrid outsource/product company providing diverse experience across multiple areas.

Key Responsibilities

  • Maintaining internal systems (Angular.js + Express.js) and public websites (Vue.js + Nuxt.js)
  • Developing and maintaining a custom SSR framework based on Node.js and Web Components
  • Building web applications for client projects
  • Infrastructure support: private NPM packages, data access library, CI/CD pipelines, server setup
  • Interviewing and mentoring junior developers

Achievements

  • Created a custom SSR framework based on Native Web Components and Node.js
  • Built a CLI for quick bootstrapping of new websites
  • Increased Node.js server performance using Workers
  • Covered data access library with comprehensive tests
  • Made the main system more modular with cross-platform functionality
VueNuxtAngular.jsNode.jsExpress.jsWeb ComponentsMongoDBWebSockets

FullStack Developer

Freelance

Remote

Jun 2019 - Jun 2021

Started with HTML/CSS, transitioned through PHP/WordPress to JavaScript and Vue.js.

Achievements

  • Ranked in the top 10% of freelancers based on client reviews and performance
  • Developed 10+ custom WordPress themes and several Laravel-based websites
  • Built a large Vue-based eCommerce platform with a custom CRM
  • Created 200+ unique responsive layouts for long-term client projects
  • Specialized in front-end performance optimization (Core Web Vitals)
Vue.jsJavaScriptPHPWordPressLaravelHTML/CSS

Nazarii Semeniuk

I'm a FullStack Developer with 5+ years of experience in web development. I'm passionate about building excellent software that improves the lives of those around me. Always ready to both learn and share knowledge.