Kostyantyn — Javascript and Wordpress Engineer

Vetted expert in Front-End Web (7.0 yr.), Wordpress (7.0 yr.), Vue.js Developer (5.0 yr.), React Developer (0.5 yr.).

Last verified on December, 2025

Middle

B1 English

Core Skills

AI Tools & Assistants

Claude

DeepSeek

Gemini

GitHub Copilot

Grok

Qwen

Bio Summary

7 years of commercial experience with JavaScript, ECMAScript 6.
5 years with Vue.js framework (including Vue 3 core principles, Style Guide, Composition API, official documentation of the framework)
Deep understanding of HTML5 and CSS3.
Interacting with API endpoints and other web services.
Converting UI/UX mockups into functional web applications with pixel perfection
Experience with responsive layout, web sites, mini applications in JS and SPA in Vue.js.
Familiar with SOLID, DRY and other clean code design principles.
Experience with UI components like UI Kit & Bootstrap
Unit tests (Cypress)
Projects with Wordpress
Intermediary English

Technical Skills

Programming Languages	JavaScript
AI & Machine Learning	Claude, GPT, Grok
JavaScript Libraries and Tools	ES6, Gulp.js, Pinia, Vue Router, Vuex, Webpack
JavaScript Frameworks	jQuery, React, Vue.js
UI Frameworks, Libraries, and Browsers	Ajax, Bootstrap, Chrome Extensions, CSS, HTML, HTML5, HTML/CSS Preprocessors, jQuery, LESS, SASS, SCSS
Methodologies, Paradigms and Patterns	Agile, DRY, Kanban, MVC, Scrum, SOLID, TDD
SDK / API and Integrations	API, RESTful API
QA, Test Automation, Security	Cypress, Unit Testing
Virtualization, Containers and Orchestration	Docker
Version Control	Git
iOS Libraries and Tools	UIKit
Platforms	WordPress

Work Experience

Founding Front-End (Vue) Engineer

2019-present

Upstaff is a service and platform to help scale IT companies with experienced individuals and teams fast. There are 3 major sections of the project:

Upstaff portal

Landing pages
Login/Registration pages, Authorization.
User dashboards
Reporting
Marketplace and external request/talent cards
User profiles

Upstaff people operation managers portal

Authorization
Admin panel, dashboards, reporting
Search and matching functionality for different roles (clients, individual engineers, partners with engineering resources)
Job-Telant funnel, interview and vetting process, ongoing support and supervision.
Mail messages/newsletters

White Label Portal

User profiles (Registration, Authorization, Profile)
Company and user management, ReBAC user permissions, workspaces.
Company custom templates, and external job/talent profiles.
ATS matching, funnels, reporting.

Responsibilities:

Core front-end functionality, architecture design, code review.
Adaptive page templates (web/mobile), navigation, and content.
Refactoring, bug-fixing.

Technologies: JavaScript, Vue.js, Vuex, Vue-Router, Celery, CI/CD, Cypress, Pinia

Front-End JavaScript Engineer

2018-2019

Projects: under NDA (Marketplace, Landing pages)

Technology stack: JavaScript, Vue, ES6, CSS, HTML, Bootstrap, API.

Wordpress Developer / Front-end Developer (JetBrain, Freelance)

2018-2017

Portfolio:

venusbridal.co.uk
averecommodities.com
it-solutions.ua
octava.ua
lcf.ua
othersweets.com
actorstax.com
case-ukraine.com.ua
cost.ua
notagroup.com.ua
northernlightspr.com

Senior Production Manager for the production of metal structures

2017

Responsibilities:
- Achieving profitability by providing clear daily production goals and support to ensure every Shift Supervisor safely meets production, quality and efficiency goals daily.
- Prepare Performance Plans for each direct report that clearly articulates expectations for production outcomes, safety performance, and work center hygiene that will result in the company achieving its monthly, quarterly and annual goals.
- Meet weekly with Production Support Manager to develop Production Plan by reviewing Capacity Plan and MRP for raw material shortages.
- Ensure that the resources i.e. machinery, tools, workers, etc. are efficiently deployed and closely monitor them to ensure the timely completion of given tasks.
- Review the project's overall progress with the site supervisor, project engineer daily.

Education

Engineer
State Academy - Faculty of Mechanical Engineering,
Enterprise Economics Specialist
State Academy - Faculty of Economics

How to hire with Upstaff

Talk to Our Talent Expert

Our journey starts with a 30-min discovery call to explore your project challenges, technical needs and team diversity.

Meet Carefully Matched Talents

Within 1-3 days, we’ll share profiles and connect you with the right talents for your project. Schedule a call to meet engineers in person.

Validate Your Choice

Bring new talent on board with a trial period to confirm you hire the right one. There are no termination fees or hidden costs.

Why Upstaff

Upstaff is a technology partner with expertise in AI, Web3, Software, and Data. We help businesses gain competitive edge by optimizing existing systems and utilizing modern technology to fuel business growth.

Real-time project team launch

<24h

Interview First Engineers

Upstaff's network enables clients to access specialists within hours & days, streamlining the hiring process to 24-48 hours, start ASAP.

x10

Faster Talent Acquisition

Upstaff's network & platform enables clients to scale up and down blazing fast. Every hire typically is 10x faster comparing to regular recruitement workflow.

Vetted and Trusted Engineers

100%

Security And Vetting-First

AI tools and expert human reviewers in the vetting process is combined with track record & historically collected feedbacks from clients and teammates.

~50h

Save Time For Deep Vetting

In average, we save over 50 hours of client team to interview candidates for each job position. We are fueled by a passion for tech expertise, drawn from our deep understanding of the industry.

Flexible Engagement Models

Custom Engagement Models

Flexible staffing solutions, accommodating both short-term projects and longer-term engagements, full-time & part-time

Unique Talent Ecosystem

Candidate Staffing Platform stores data about past and present candidates, enables fast work and scalability, providing clients with valuable insights into their talent pipeline.

Transparent

No Hidden Costs

Price quoted is the total price to you. No hidden or unexpected cost for for candidate placement.

One Consolidated Invoice

No matter how many engineers you employ, there is only one monthly consolidated invoice.

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