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I'm a Senior Fullstack Engineer with 8+ years of experience building high-performance, scalable web applications. I specialize in modern Frontend development (Vue.js, Nuxt.js, React, Next.js) and have solid backend experience with PHP, WordPress, and Headless CMS. I bring strong expertise in payment gateway integrations, REST APIs, and automation workflows (n8n), and I have a track record of resolving critical security vulnerabilities in fintech and e-commerce systems. I also have technical leadership experience, helping teams adopt Git flow, architecture standards, and robust code review practices.…I'm a Senior Fullstack Engineer with 8+ years of experience building high-performance, scalable web applications. I specialize in modern Frontend development (Vue.js, Nuxt.js, React, Next.js) and have solid backend experience with PHP, WordPress, and Headless CMS. I bring strong expertise in payment gateway integrations, REST APIs, and automation workflows (n8n), and I have a track record of resolving critical security vulnerabilities in fintech and e-commerce systems. I also have technical leadership experience, helping teams adopt Git flow, architecture standards, and robust code review practices.

Oleksandr Kulachynskyi

Front-End Developer, Full Stack Developer, Web Developer, +2

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I'm a Senior Fullstack Engineer with 8+ years of experience building high-performance, scalable web applications. I specialize in modern Frontend development (Vue.js, Nuxt.js, React, Next.js) and have solid backend experience with PHP, WordPress, and Headless CMS. I bring strong expertise in payment gateway integrations, REST APIs, and automation workflows (n8n), and I have a track record of resolving critical security vulnerabilities in fintech and e-commerce systems. I also have technical leadership experience, helping teams adopt Git flow, architecture standards, and robust code review practices.…I'm a Senior Fullstack Engineer with 8+ years of experience building high-performance, scalable web applications. I specialize in modern Frontend development (Vue.js, Nuxt.js, React, Next.js) and have solid backend experience with PHP, WordPress, and Headless CMS. I bring strong expertise in payment gateway integrations, REST APIs, and automation workflows (n8n), and I have a track record of resolving critical security vulnerabilities in fintech and e-commerce systems. I also have technical leadership experience, helping teams adopt Git flow, architecture standards, and robust code review practices.

Available to hire

I’m a Senior Fullstack Engineer with 8+ years of experience building high-performance, scalable web applications. I specialize in modern Frontend development (Vue.js, Nuxt.js, React, Next.js) and have solid backend experience with PHP, WordPress, and Headless CMS.

I bring strong expertise in payment gateway integrations, REST APIs, and automation workflows (n8n), and I have a track record of resolving critical security vulnerabilities in fintech and e-commerce systems. I also have technical leadership experience, helping teams adopt Git flow, architecture standards, and robust code review practices.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Work Experience

Team Lead WordPress / Senior Fullstack Engineer at WhiteTech

May 1, 2025 - February 1, 2026

Led technical processes including Git flow, code review standards, and architectural decisions; Developed and maintained payment plugins for WordPress, OpenCart, and PrestaShop; Identified and fixed a critical security vulnerability in a WooCommerce payment plugin that caused financial losses; Built corporate websites for PSP and EMI with GSAP-driven animations and custom state management architecture; Architected and implemented a middleware integration between PeopleForce and Greenhouse to automate data synchronization and streamline HR processes.

Fullstack Engineer at Markant

May 1, 2024 - November 1, 2024

Improved internal WordPress plugin for enterprise-level content editing workflows; Customized WooCommerce solutions for Norwegian client including animations and advanced frontend interactions; Contributed to Shopify plugin development.

Founder and Fullstack Engineer at Branded

December 1, 2021 - May 1, 2025

Led a full-scale e-commerce platform; Improved UX/UI, website performance, and SEO structure; Integrated advertising such as Google Ads and Facebook Analytics, and implemented multilingual versions via WPML; Built a front-end application in Vue.js / Nuxt.js using WordPress as a Headless CMS, creating custom endpoints to manage data; Implemented Core Web Vitals optimizations and asset loading improvements; Integrated ChatGPT API for article summarization and data substitution into site forms.

Front-end Engineer at Vilmate

December 1, 2022 - December 1, 2023

Led development for Awarebee – Web Monitoring Platform and contributed to RunForUkraine startup initiative; Built marketing website with AI-powered features to monitor web page changes; Utilized modern front-end technologies to deliver responsive, accessible UI; Also worked on blogs, news platforms, marketplaces, and e-commerce sites, providing React and WordPress-based solutions.

Front-end / WordPress Developer at Freelance / Various

July 1, 2017 - December 1, 2022

Front-end / WordPress development across blogs, news platforms, marketplaces and e-commerce sites; Integrated payment systems, optimized SEO and performance; Built interactive UI solutions using React and Vue.js.