Open to opportunities

Aleksandr Andreiko

@chgrin

I build high-performance frontend products and PWAs, owning features end-to-end to deliver measurable business outcomes.

Armenia

Message

What I'm looking for

I’m looking for a team where I can own frontend architecture and performance, deliver end-to-end features, and turn measurable business outcomes into reality—using modern practices and AI tooling in a pragmatic, quality-first culture.

I’ve been building high-performance SaaS product and e-commerce platforms for 7M+ MAU, with a focus on frontend architecture, performance optimization, and end-to-end feature ownership—from requirements through release.

Most recently, I transformed an application into a high-performing PWA, improving offline functionality and reducing initial load time. I’ve also delivered practical product tools (like a floor plan selection workflow and a meeting schedule manager), raised codebase testing coverage from 5% to 25%, and built financial plan/actual dashboards to enable data-driven decisions.

Earlier, at National Media Group, I maintained and refactored a large legacy jQuery/vanilla JavaScript codebase, spearheaded a redesign that drove 25% traffic growth, and implemented async modular widgets that accelerated FCP by 40%. I’ve also improved subscription revenue by 20%, run A/B testing to increase user session duration by 30%, and onboarded/trained teammates to ensure smooth handovers—staying pragmatic about code quality and modern practices, and using AI tooling to enhance my day-to-day workflow.

Experience

Work history, roles, and key accomplishments

Current

Senior Frontend Developer

Current

Keep Calm

Apr 2024 - Present (2 years 2 months)

Transformed an application into a high-performing PWA, improving offline functionality and reducing initial load time. Increased test coverage from 5% to 25%, built a financial plan/actual dashboard, and delivered tools to streamline scheduling and daily agent workflows.

PWA Frontend Architecture Performance Optimization Dashboards JavaScript TypeScript

Frontend Developer

National Media Group

Dec 2020 - Nov 2023 (2 years 11 months)

Maintained and refactored a large legacy codebase using jQuery and vanilla JavaScript. Boosted revenue 20% by building a premium subscription system and increased traffic 25% by redesigning a high-traffic site, improving FCP by 40% and session duration by 30% with async modular widgets and A/B testing.

JavaScript jQuery FCP A B Testing Subscriptions Refactoring

Junior Frontend Developer

Leomax

Aug 2019 - Dec 2020 (1 year 4 months)

Built 50 high-converting landing pages using React and styled-components. Reduced deployment times by 30% by optimizing Webpack build processes and improved performance and maintainability by refactoring jQuery code to modern JavaScript.

React styled components JavaScript Webpack Landing Pages JQuery To Vanilla Refactoring E Commerce Frontend Features

Education

Degrees, certifications, and relevant coursework

GeekBrains

Course, HTML/CSS and ReactJS

2019 - 2020

Completed GeekBrains courses in HTML/CSS and ReactJS from 2019 to 2020.

The First Moscow Educational Complex

Specialist (Secondary Vocational Education), Advertising and Multimedia Technologies

2012 - 2016

Completed secondary vocational education from 2012 to 2016 as a specialist in Advertising and Multimedia Technologies. Earned the Grand Prix for the graduation diploma.