Serhii

Serhii Diachenko Frontend Developer
Front End Developer Freelance, Feb 2024 - Present
Modern Content Platforms: Developed high-performance websites
rontend engineer with 9+ years of
F

experience building scalable web and
using Astro and Tailwind CSS, integrated with Sanity CMS for flexible
mobile applications. Strong focus on UI/UX content management

quality, performance, and maintainable Cross-Framework Development: Building and supporting various
architectures. Experienced in product- client-side applications using both Angular and React, ensuring high
driven development, close collaboration code standards and performance.

with design and backend teams, and
delivering production-ready solutions
across SaaS, e-commerce, and custom
Stack: Angular, React, NestJS, Astro, Tailwind CSS, Sanity CMS, Ant Design.
platforms.

C ontacts Frontend Developer / Shopify Developer
[open contact info](look above in the "contact info" section)
Leangenix LDA/Starlight Management Group - Remote, Sep 2019 - Feb
[open contact info](look above in the "contact info" section) 2024
[open contact info](look above in the "contact info" section) Customer Feedback Voting Tool: Created a full-stack voting platform
[open contact info](look above in the "contact info" section)
for brands to gather customer insights on product design, pricing, and
flavors.

AI-Powered Applications: Developed innovative tools integrating
Skills ChatGPT (OpenAI) and PlayHT for automated content generation and
Frontend architecture & SPAs
 voice synthesis.

UI / UX implementation & Design Cancer Detection Platform: Built a specialized application for doctors
systems
and labs to facilitate early-stage cancer detection.

Performance optimization
Shopify E-commerce Ecosystem: Developed and maintained high-
E-commerce & Mobile Solutions
traffic Shopify Partner stores, including custom theme development and
API integration & Real-time features
custom apps (React/Remix) focused on conversion rate optimization
Cross-browser & Responsive layout (CRO) and performance.

Shopify Apps: Engineered custom applications for the Shopify App Store
T ools using React and Remix, extending platform capabilities for merchants.

Angular, NestJS, React, Next.js, Remix, Travel Companion App: Built a specialized platform for travelers to
Redux, Zustand, TypeScript, JavaScript, organize group trips, manage itineraries, and find travel partners.

Astro, HTML5, CSS, SCSS, Shopify Liquid,
Node.js, Ionic, Cordova, Capacitor, Key Results:

Figma, Tailwind, Sanity CMS,

HealthTech Contribution: Delivered a secure and intuitive interface for
Bootstrap, Ant Design, Material Design,
medical professionals using the Angular/Ionic stack.

Google Maps API, OpenStreetMap API.
Performance & CRO: Significantly improved store loading speeds and
user engagement metrics through custom Shopify Liquid optimizations.

Custom Theme Architecture: Developed highly flexible Shopify themes
Approaches

from scratch using Liquid, implementing custom sections and blocks for
Component-driven development
 easy merchant customization.

UI / UX collaboration


Design system thinking
 Stack: React, Remix, Angular, Ionic, NestJS, OpenAI API, Shopify Liquid, Ant
Performance-first mindset
 Design, Node.js, SCSS, HTML5, Google Maps API.
Clean and maintainable code

Product-oriented development

Code review
Education & Learning Frontend Developer
Technician-programmer,
Unibrix - Remote, Jul 2021 - Nov 2021
Cherkasy Artistic and Technical N etflix Internal Production Management System: Contributed to a
College
high-scale internal ecosystem used for collaboration between
Sep 2004 - June 2008 production specialists, vendors, and resource providers for Netflix
original content.

Android
Key Results:

Project Geekhub, 2019 Advanced State Management: Utilized NgRx to manage complex data
flows and ensure predictable state across the production management
platform.

Java for Web
System Expansion: Developed and integrated sophisticated UI modules
Project Geekhub, 2018
for managing media assets, marketing materials (banners, ads), and
merchandise production workflows.

Front End Workflow Automation: Improved internal tools designed to streamline
SPD-University, 2017
interaction between departments providing tools and services for film
sets and studios.

Enterprise-Grade UI: Built scalable and performant Angular
JavaScript

components.

Project Geekhub, 2016
Stack: Angular, NgRx, TypeScript, RxJS, SCSS, HTML5.
Frontend + CMS
Project Geekhub, 2015

Software Testing Frontend Developer
QATestLab, 2013
SSA Group - Remote, Apr 2019 - Sep 2019
Logistics Management System: Developed a large-scale platform for
vehicle tracking and route optimization, focusing on real-time data
visualization.

Corporate Reporting App: Built a cross-platform mobile application for
internal use, enabling employees to submit and manage work reports
on the go.

Key Results:

Real-Time Route Tracking: Integrated advanced mapping features to
monitor vehicle movements and status updates, improving logistics
transparency.

Stack: Angular, Ionic, TypeScript, RxJS, SCSS, HTML5, OpenStreetMap API.

Frontend Developer
Starlight Management Group - Remote, Dec 2017 - Apr 2019
European Service Platforms: Developed and maintained multiple
internal service-oriented projects and MVPs for the European market.

Charity Platforms: Built and supported web applications for charitable
organizations, focusing on user-friendly interfaces and donation flows.

Geospatial Tools: Created complex mapping features and location-
based services using extensive Google Maps API integration.

Key Results:

Rapid MVP Development: Streamlined the development process for
internal startups, delivering functional MVPs from scratch within tight
timelines.

Stack: Angular, TypeScript, Google Maps API, SCSS, HTML5, RxJS, RESTful APIs
Languages Frontend Developer
English - Intermediate (B1–B2)
Default Value - Ukraine, Jul 2017 - Dec 2017
Ukrainian - Native
Large-Scale Online Game: Maintained and scaled a complex web-
Russian - Native
based game, implementing new features and modernizing legacy
code.

Event Mini-Games: Developed interactive in-game modules and
seasonal mini-games built with complex SVG animations.

Key Results:

High-Performance Graphics: Engineered lightweight, scalable SVG-
based animations for mini-games, ensuring smooth performance
across all devices.

Stack: React, JavaScript, SCSS, HTML5, SVG.

Frontend Developer
Webquali - Ukraine, Feb 2016 - Apr 2017
Taxi App: Dual-version system (Driver/Client) with real-time tracking
and booking.

Museum Guide: Navigation app with automatic content activation via
indoor sensors (Beacons).

Lotto App: Mobile gaming application with dynamic UI updates.

Shipbuilding Catalog: Product showcase with complex UI and high-end
animations.

Key Results:

High-Performance Animations: Engineered a custom engine using
SCSS and Canvas, achieving 60 FPS visual performance for complex UI
transitions.

Hardware Integration: Integrated Bluetooth sensors to enable precise
indoor positioning and automated, location-based content delivery.

Stack: AngularJS, Ionic, Cordova, SCSS, HTML5, Canvas.