Sergey Marchenko.

Senior Frontend Developer
sergey.dnepro@gmail.com
+380 97 914 8934
linkedin.com/in/sergey-marchenko-639520155
github.com/semarche
Ukraine (Remote)

About

Senior Frontend Developer with over 14 years of experience specializing in building responsive, high-performance web applications. Passionate about creating intuitive user interfaces using modern JavaScript frameworks, with a focus on accessibility and performance optimization. Skilled in collaborating with cross-functional teams to deliver exceptional digital experiences.

Skills

  • JavaScript
  • TypeScript
  • React
  • Next.js
  • Vue.js
  • Node.js
  • HTML5
  • CSS3/SCSS
  • Tailwind CSS
  • Redux
  • GraphQL
  • REST API
  • Jest
  • React Testing Library
  • Webpack
  • Vite
  • Git
  • CI/CD
  • Agile/Scrum
  • Performance Optimization
  • Responsive Design
  • Accessibility (WCAG)

Experience

2018 - Present
San Hose, CA

Senior Frontend Developer

Enterprise Company

Leading frontend development for enterprise applications using React and TypeScript.

  • Built and maintained complex enterprise applications with a focus on performance
  • Implemented design systems and component libraries for consistent UI across products
  • Mentored junior developers and conducted code reviews
  • Optimized applications for maximum speed and scalability
2016 - 2018
Remote

Senior Frontend Developer

Government Agency

Developed and maintained web applications for government services using React and Redux.

  • Created accessible and user-friendly interfaces for government services
  • Implemented robust state management with Redux for complex applications
  • Ensured compliance with government security standards and accessibility requirements
  • Collaborated with cross-functional teams to deliver high-quality solutions
2014 - 2016
Ukraine, Dnipro

Frontend Developer

Digital Agency

Developed responsive websites and web applications for various clients.

  • Created pixel-perfect UIs from design mockups
  • Built responsive websites for optimal viewing on all devices
  • Collaborated with designers to implement creative solutions
  • Developed custom themes and plugins for CMS platforms
2013 - 2014
Oslo, Norway

Frontend Developer

HealthDash

Developed accessible healthcare dashboard for patients to view medical records and appointments.

  • Implemented accessible interfaces following WCAG standards
  • Integrated with healthcare APIs for patient data
  • Created interactive visualizations for medical data
  • Ensured secure handling of sensitive patient information
2011 - 2013
Ukraine, Dnipro

Junior Web Developer

Startup

Assisted in building and maintaining web applications using JavaScript and CSS.

  • Developed responsive UI components using HTML, CSS, and JavaScript
  • Collaborated with senior developers on implementing features
  • Fixed bugs and improved site performance
  • Participated in code reviews and learned best practices

Education

2005 - 2009
Dnipro, Ukraine

Bachelor's Degree

Dnipro University

Computer Science and Engineering

2009 - 2010
Dnipro, Ukraine

Master's Degree

Dnipro University

Web Development and Design

Projects

Pixel

Dashboard for designers and developers

React, TypeScript, Material UI

Navion

Web application for navigation and mapping

Next.js, MapBox API, TailwindCSS

Company Landing Page

Landing page for a tech company

React, GSAP, Styled Components

Currnt

Web application for financial company

React, Redux, Chart.js

Coin machine

Admin panel for coin machine service

Angular, NgRx, Bootstrap

Appko

Web application for development company

Vue.js, Vuex, Tailwind CSS

XDR Security

Admin panel for XDR security service

Vue.js, Vuex, Tailwind CSS

Company Blog

Blog for a tech company

Next.js, MDX, TailwindCSS

Languages

Russian
Ukrainian
English
Sergey Marchenko — Senior Frontend Developer
Back to Portfolio