Principal Front-End Engineer

Arnas
Fomenko

I build design systems, lead front-end teams, and ship products people actually enjoy using. React, TypeScript, and a lot of attention to detail.

Vilnius, Lithuania

About me

Started as a full-stack developer, gradually moved closer to the browser. These days I focus on front-end architecture, design systems, and making sure teams ship quality UI at scale.

I care about clean component APIs, consistent design tokens, and keeping things simple. Outside of work - cycling, reading, and the occasional side project.

Highlights

Angular → React migration

Led micro-frontend migration and design system consolidation at Omnisend.

AI product, 3-month launch

Shipped an AI-powered email marketing tool at Hostinger - front-end architecture & UX.

Hiring & team growth

Built front-end interview processes, reviewed take-home tasks, and helped scale the team.

Skills & tools

Frontend

  • React
  • Next.js
  • Vue.js
  • Angular
  • TypeScript

Design & Quality

  • Design Systems
  • Storybook
  • Performance
  • Accessibility

Testing

  • Jest
  • Vue Testing Library
  • Unit Testing
  • End-to-End Testing

Workflow

  • Mentorship
  • Code Review
  • Agile

Languages

LithuanianNative
EnglishC1
RussianB2

Where I've worked

Hostinger

2024 - Present

Principal Front-End Engineer

  • Shipped an AI-powered email marketing tool in 3 months - owned the front-end from prototype to production.
  • Built a live email template editor from scratch, pairing visual UI editing with automatic HTML template generation.
  • Led front-end live coding interviews - candidate evaluation and technical assessment.

Omnisend

2023 - 2024

Senior Front-End Engineer

  • Led the migration from an Angular monolith to React micro-frontends.
  • Contributed to the shared design system, improving consistency across products.
  • Mentored junior engineers through pairing sessions and thorough code reviews.

CGTrader

2020 - 2023

Front-End Engineer

  • Introduced TypeScript, Next.js, and modern testing practices to the stack.
  • Owned the design system and established code ownership patterns.
  • Promoted to lead front-end hiring - task design, interviews, and candidate evaluation.

Reflecto

2019 - 2020

Full-Stack Engineer

  • Worked on front-end and back-end of 5 different projects in a small team.
  • Picked up React and rewrote legacy jQuery codebases to modern React applications.
  • Learned Kotlin and developed an Android application.

CoinGate

2017 - 2018

Full-Stack Engineer

  • Developed and maintained e-commerce plugins for major platforms.
  • Enabled official Prestashop partnership through plugin development.
  • Integrated customer projects with CoinGate payment APIs.

Where I studied

Harvard University (edX)

Computer Science for Web Programming

2023

Vilnius University

BA in Computer Science

2016 - 2019

Let's talk

Open to interesting projects, consulting, or just a good conversation about front-end engineering. Drop me a line.

© 2026 Arnas Fomenko