Open to opportunities

Oleh Halushko

@olehhalushko

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Senior Shopify developer focused on fast, scalable storefronts and CRO-driven growth.

United Kingdom

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What I'm looking for

I’m looking for a team where I can deepen Shopify Plus and custom app development, lead performance/CRO improvements, and collaborate with design and marketing to ship scalable, conversion-focused storefronts using data-driven experimentation.

I’m a Shopify Developer with 6+ years of experience building e-commerce solutions that are fast, scalable, and built to convert. I’ve helped brands launch new stores, optimize existing ones, and push the boundaries of what’s possible on the Shopify platform—balancing technical execution with a commercial mindset.

My work spans theme development (custom Shopify themes using Liquid, HTML, CSS, and JavaScript), app & integration engineering (custom Shopify apps and integrations like Klaviyo, Recharge, Rebuy, Yopto, Judge.me, and Algolia), and headless/front-end development (Next.js, Vue.js, and Shopify Hydrogen). In performance and CRO roles, I optimize speed, SEO, and accessibility, run A/B tests, and mentor developers to deliver measurable business impact through data-driven experimentation and refined user experiences.

Experience

Work history, roles, and key accomplishments

Senior Shopify Developer

USA Softnix

Dec 2023 - Apr 2026 (2 years 4 months)

Led conversion-rate optimization, SEO performance, and scalable Shopify architecture across Shopify Plus storefronts, custom apps, and checkout extensions. Built high-performance themes, ran A/B tests, and mentored developers to improve user experience and business outcomes.

Shopify Plus Theme Development Performance Optimization A B Testing Liquid JavaScript

Shopify Developer

Clssoft

Aug 2021 - Sep 2023 (2 years 1 month)

Supported design and development of Shopify stores by building responsive themes and integrating third-party apps and APIs. Improved speed, SEO, and mobile responsiveness while troubleshooting and maintaining live Shopify sites.

Liquid Responsive Web Design JavaScript SEO CRO Git

Web Developer

Upstaff

Oct 2020 - Aug 2021 (10 months)

Developed full-stack web applications using the MERN stack, building APIs and connecting databases to support responsive user experiences. Deployed projects on cloud platforms (Vercel, Netlify, AWS) and improved website speed, security, and performance.

React Express MongoDB MERN Stack REST API Development Performance Optimization Security cloud deployment