200+ satisfied clients
We deliver unique designs and seamless UX through Shopify theme customization for high-converting stores.
Talk to foundersGet free estimation in 24h
120+
successfully completed projects
95%
satisfied clients
3+
Years average collaboration duration
20+
countries served
Our Shopify customizatio approach is centered on producing outcomes that make an impact. By using this flexible and thorough approach, we guarantee that every project gets the attention and accuracy it requires.
Stellar's theme customization creates a unique store - custom themes, improved features, easy shopping to boost sales.
We design a theme fitting your brand, making shopping effortless and keeping customers engaged.
We improve structure and navigation so customers find what they need quickly, enhancing the shopping experience.
We add features like advanced search and personalized recommendations to make shopping faster and more intuitive.
We improve speed for a smooth experience—faster stores reduce bounce rates and boost conversions.
Your store looks great and works flawlessly on any device - mobile, tablet, or desktop - for seamless shopping.
We build custom eCommerce applications that remove operational bottlenecks, connect fragmented systems, and support complex business processes at scale.
Challenge
Risk
Solution
Standard eCommerce platforms can’t support complex business logic
Teams rely on workarounds, manual operations, or restrictive platform limitations.
We build custom eCommerce apps around your actual workflows, rules, and growth requirements.
Critical processes are still handled manually
Higher operational costs, slower execution, and increased risk of human error.
We automate repetitive workflows, data processing, order handling, and other high-impact operations.
Business systems operate in isolation
Inconsistent inventory, customer, order, and product data across platforms.
We connect eCommerce platforms with ERP, CRM, PIM, WMS, 3PL, payment, and other systems through reliable integrations.
Existing apps struggle as traffic and operations grow
Performance issues, downtime, and technical limitations begin to affect revenue.
We optimize architecture, backend services, APIs, and infrastructure to keep applications fast and stable under growing load.
From eCommerce to fintech, our clients span 20 countries and every project is different.
Denmark
How we rebuilt the storefront, split the EU and US into separate stores, and set up Shopify Markets for Europe - without pausing orders.
UK
How we moved retail and trade to Shopify Plus on native B2B, no custom backend - B2C on schedule, trade portal a month later.
Ukraine · USA
How we rebuilt the store on Online Store 2.0, simplified checkout, and automated inventory and marketing with NestJS, Klaviyo and Zapier.
Germany
The client created the concept in Claude, and we adapted it into a custom WordPress theme while preserving the URL structure and SEO metadata.
USA
We integrated an AI assistant into the World Jewish Travel WordPress website that creates personalized travel itineraries and generates AI videos or podcasts for them. We also developed a mobile app and a content generator that follows the brand’s style.
France
How we moved Côte&Ciel's three Shopify storefronts out of the PageSpeed red zone without pausing sales.
Choose a Shopify partner that delivers results. Stellar offers dedicated professionals and a proven track record.
Tailored Solutions
We create custom themes for your brand and business. 90% of our clients report better customer engagement after optimizations.
Proven Expertise
Our experienced team has a track record of delivering results. 75% of clients see a significant sales boost within the first three months.
Efficiency
We handle all technical setup and optimizations, saving you time. We save businesses 40+ hours.
SEO-Optimized
We design SEO-friendly themes that drive traffic. Our optimizations lead to up to a 30% increase in organic traffic.
Tailored Solutions
We create custom themes for your brand and business. 90% of our clients report better customer engagement after optimizations.
Proven Expertise
Our experienced team has a track record of delivering results. 75% of clients see a significant sales boost within the first three months.
Efficiency
We handle all technical setup and optimizations, saving you time. We save businesses 40+ hours.
SEO-Optimized
We design SEO-friendly themes that drive traffic. Our optimizations lead to up to a 30% increase in organic traffic.
Our professional Shopify theme customization services help businesses tailor storefront design, functionality, and user experience while keeping the store fast, stable, and easy to manage.
We review the current theme, storefront structure, custom code, apps, performance, and UX issues to define the required improvements.
We define design changes, custom sections, functionality, integrations, and technical requirements while minimizing unnecessary theme complexity.
We adapt layouts, sections, product pages, navigation, and responsive behavior to match your brand and improve the shopping experience.
We build custom Liquid functionality, reusable sections, theme extensions, integrations, and tailored eCommerce features.
We test responsiveness, functionality, app compatibility, performance, checkout-related flows, and browser behavior before publishing changes.
We improve theme performance, refine UX, maintain custom functionality, and support ongoing Shopify store updates as business needs evolve.
We use modern technologies and tools to develop, optimize, and maintain high-performance and stable platforms.
ShopifyShopify Plus
HydrogenMarkets
Liquid
JavaScript
TypeScript
React
Next.js
AWS
Google Cloud
Azure
Cloudflare
GitHubWe build custom eCommerce applications for online stores, digital brands, and SaaS platforms — helping automate operations, connect business systems, and support scalable growth.
netparcel
sigma
a&g
pineapple
bering
cultnaked
lock
nila
heyholy
webloft
lgfgDiscover how our solutions help overcome technical barriers, maintain system reliability, and implement innovations that drive sales growth.
5.0
Overall Review Rating
“Three Years of Reliable Delivery”
Stellar has supported our Shopify store for three years, building backend functionality and custom tools. They’re fast, responsive, and reliable.
Co-Founder at HEY HOLY, an eCommerce pet brand
“Built on Clarity and Speed”
Stellar impressed us with clear, fast communication and a well-structured process, especially when deadlines were tight and quick decisions were critical.
Creative Director at Long Story Short
Stellar transformed our sales processes, streamlining operations and automating manual work to save significant time and improve the overall customer experience.
CEO, LGFG Fashion House
Stellar stood out among five shortlisted companies with a detailed, transparent plan and pricing strategy. Jack also provided clear guidance and valuable insights.
Owner at NILG.AI
Stellar’s Shopify expertise and ability to deliver advanced custom solutions reflect strong technical skills and a focus on scalable, high-quality eCommerce.
Shopify & eCommerce Expert, Owner at Digitalebox.de
They bring a positive attitude and use their expertise to improve projects beyond the brief, considering key factors like SEO, responsiveness, and overall quality.
Director of Marketing at Cooper Mountain Technologies
They consistently deliver on time and within budget, follow through on commitments, and stay proactive with communication - even when clients are slow to respond.
Co-owner, Marketing Nice Guys
Tell us what you are building and we will help you shape the next step.
Vladimir Gubarev
COO and Co-founder
Jack Ananchenko
CEO and Co-founder
From eCommerce to fintech, our clients span 20 countries and every project is different.
DenmarkHow we rebuilt the storefront, split the EU and US into separate stores, and set up Shopify Markets for Europe - without pausing orders.
UKHow we moved retail and trade to Shopify Plus on native B2B, no custom backend - B2C on schedule, trade portal a month later.
Ukraine · USAHow we rebuilt the store on Online Store 2.0, simplified checkout, and automated inventory and marketing with NestJS, Klaviyo and Zapier.
GermanyThe client created the concept in Claude, and we adapted it into a custom WordPress theme while preserving the URL structure and SEO metadata.
USAWe integrated an AI assistant into the World Jewish Travel WordPress website that creates personalized travel itineraries and generates AI videos or podcasts for them. We also developed a mobile app and a content generator that follows the brand’s style.
FranceHow we moved Côte&Ciel's three Shopify storefronts out of the PageSpeed red zone without pausing sales.
