Challenge
The design looks outdated.
Risk
Shoppers are more likely to choose competitors.
Solution
We create a modern Shopify theme that strengthens your brand, simplifies navigation, and improves the user experience.
+94 SATISFIED CLIENTS
Shopify Theme Development Services
Build a high-performing Shopify theme with a trusted agency that has delivered 120+ successful eCommerce projects.
Talk to foundersGet free estimation in 24h
120+
successfully completed projects
95%
satisfied clients
3+
years average collaboration duration
20+
countries served
120+
successfully completed projects
95%
satisfied clients
3+
years average collaboration duration
20+
countries served
Why us
Stellar: Shopify Theme Development Company
As a Shopify theme dev agency, we develop Shopify themes that deliver speed, ease of use, and stable store performance even as Shopify evolves and your project grows. Every solution is built with your business goals and future store scalability in mind. As a Shopify Partner, we follow the platform’s best practices at every stage of development, combining thoughtful architecture, high performance, and the flexibility required to support modern ecommerce businesses.
OUR EXPERTISE
Our Shopify Theme Development Services
We provide comprehensive Shopify theme development, customization, optimization, migration, and support services, helping businesses build stores ready for long-term growth and scalability.
We develop custom Shopify themes optimized for high performance, providing the flexibility and scalability your store needs for future growth:
design solutions from scratch based on your brand and business requirements;
create custom templates, sections, and blocks;
build scalable architecture;
configure the theme according to Shopify Best Practices.
We enhance existing Shopify themes by adding the functionality you need and improving the user experience:
adapt the design to new business requirements;
add new sections, templates, and components;
update page structure and navigation;
extend functionality without replacing the existing solution.
We optimize theme performance to deliver speed, stability, and a better user experience:
improve page loading speed;
optimize Core Web Vitals;
enhance performance on mobile devices;
resolve issues affecting store performance.
We extend your theme’s capabilities with custom development using the Shopify Liquid templating language:
create custom templates and components;
develop custom sections and blocks;
configure metafields and dynamic content;
implement custom theme logic.
We migrate your store to a new Shopify theme without compromising data, SEO settings, or store stability:
safely replace your existing theme;
preserve page structure and content;
migrate settings and required functionality;
verify everything works correctly after launch.
We support your Shopify theme after launch to keep it stable, up to date, and ready for future changes:
fix bugs and technical issues;
update the theme in line with Shopify changes;
add new sections and functionality;
provide ongoing technical support.
CHALLENGES WE SOLVE
Common Challenges We Solve
We solve the issues that hold your store back by developing and optimizing for stable performance, better user experience, and higher conversion rates.
Challenge
Risk
Solution
The design looks outdated.
Shoppers are more likely to choose competitors.
We create a modern Shopify theme that strengthens your brand, simplifies navigation, and improves the user experience.
Conversion rates are lower than expected.
Fewer orders and lost revenue.
We design the interface with a focus on UX, navigation, and the customer journey to simplify product discovery and the purchasing process.
The store loads slowly.
Shoppers leave the site, and SEO performance declines.
We optimize the theme according to Core Web Vitals and Shopify Best Practices, ensuring fast and stable performance across all devices.
Even small changes take too much time.
Rising costs and slower store growth.
We develop a flexible theme architecture that simplifies scaling, updates, and adapting the store to new business needs without complex redevelopment.
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Case studies
Some of the Work We're Most Proud Of
From eCommerce to fintech, our clients span 20 countries and every project is different.
High Fashion Demands High Speed: Cultnaked’s Technical Reboot
How Stellar cut Shopify load time to under 2 seconds, increased conversions by 25%, reduced manual work by 40%, and helped drive 20% sales growth.
+25%
Conversion rate
-40%
Manual work+20%
Sales growth
Refactoring the AfterCart Shopify App: From Manual Theme Coding to Native App Blocks
AfterCart migration to Shopify 2.0: removed delays caused by on-the-fly protection product creation and reduced the risk of transaction fee losses.
3
Master Products200+
Price VariantsMINIMAL
Install Support
Why Bioma's Billing Lives Outside Magento - And How We Still Shipped in 2–3 Months
Peak season was 2–3 months away and the subscription store wasn't live yet. See how Stellar built it on Magento with Chargebee billing.
2–3 mo
Launch completed on timeDAY 1
Full commerce flow liveGREEN
Core Web Vitals under peak load
Sculptural Design, Flawless Speed
How we helped Côte&Ciel improve performance across three Shopify storefronts, while the EU store recorded a 7% YoY increase in conversion.
GREEN
Green Core Web VitalsMajor
Lighthouse Gains3
Markets, One Process
87% Mobile Traffic and Nearly €1M in Gross Sales: How We Rebuilt Hey Holy's Shopify Frontend
Custom quiz, calorie calculator, and multi-discount cart for a mobile-first Shopify store – built with Web Components + Alpine.js.
14,588
Quiz Engagement78.23%
Returning Customers2.5%
Mobile Performance
Every Product Sells Once
How we optimized a London antique retailer's Magento 2 store - custom analytics, faster search, −22% order processing time and +18% ROAS. 8-year partnership.
+18%
ROAS−22%
Order processing time10+
Hours saved weekly
How We Migrated Baketivity to Shopify Plus and Rebuilt Its Subscription Ecosystem
How Stellar migrated Baketivity from WooCommerce to Shopify Plus, rebuilt subscription logic, preserved data, and added ClassWallet features.
~65%
Returning customers1 min
0 Data Loss$
Custom Subscriptions
Shopify Horizon Migration: How King of Christmas Reduced Hardcoding and Achieved Content Autonomy
How we migrated King of Christmas from a hardcoded Dawn theme to Horizon, avoided an estimated 1,000+ development hours, and unlocked marketing autonomy.
4.8
Trustpilot rating130K+
Customer reviews0
Downtime
Green Zone for an Online Pharmacy: How We Migrated Chemist4You to Hyvä Themes Without Downtime
See how Stellar moved a UK online pharmacy to Hyvä Themes, upgraded Magento to 2.4.7-p1, and hit Google's green Core Web Vitals - with zero downtime.
4.8
Trustpilot rating130K+
Customer reviews0
Downtime
Why us
Why Choose Stellar as Your Shopify Theme Development Agency
As an experienced agency, we create and improve Shopify solutions that combine a great shopping experience, technical quality, and support your store's business goals.
As an experienced agency, we create and improve Shopify solutions that combine a great shopping experience, technical quality, and support your store's business goals.
01
Business Before Code
We develop Shopify themes based on your company goals to support efficient store operations and create a solid foundation for future growth.
02
Proactive Approach
We analyze your project, identify potential risks, and recommend solutions that improve user experience, performance, and theme flexibility.
03
Long-Term Vision
We build themes that are easy to scale, maintain, and adapt to new products, marketing campaigns, and changing business needs without costly redevelopment.
04
Transparent Collaboration
We maintain clear communication throughout every stage of the project, regularly share progress, and respond quickly to changes to ensure a transparent development process.
How We Deliver Shopify Themes
From needs analysis and planning to launch and ongoing support, we provide a full-cycle development process to keep your store fast, stable, and ready for growth.
- 01
Discovery & Planning
We analyze your company goals, project requirements, functionality, and design, then create a development plan.
- 02
Theme Architecture
We design the theme structure, templates, sections, and components to ensure flexibility, performance, and easy maintenance.
- 03
Theme Development
We develop a custom Shopify theme, implement the required functionality, and tailor it to your company needs.
- 04
Performance & QA
We test the theme, optimize performance, improve Core Web Vitals, and verify responsiveness and proper functionality across different devices.
- 05
Deployment
We deploy the theme to your live store, perform final checks, and ensure a stable launch without disrupting store operations.
- 06
Ongoing Support
We provide post-launch support, fix potential issues, and help evolve your Shopify theme as your business needs change.
Technologies and frameworks
Technology Stack Behind Our Shopify Solutions
We use modern technologies and tools to develop, optimize, and maintain high-performance and stable platforms.
Ecosystem
ShopifyShopify Plus
HydrogenMarketsFrontend
Liquid
JavaScript
TypeScript
React
Next.jsApps & APIs
Admin APIStorefront APIGraphQLApp BridgeShopify Functions
Integrations
ERPCRMPayments3PLPIM
Analytics & CRO
GA4GTMClarityShopify Analytics
Cloud & DevOps
AWS
Google Cloud
Azure
Cloudflare
GitHubBusinesses That Trust Us with Development
We 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
lgfgClient Feedback
Client Reviews About Their Collaboration Experience
Discover how our solutions help overcome technical barriers, maintain system reliability, and implement innovations that drive sales growth.
4.9
Overall Review Rating
Annika Rahm
Co-Founder at HEY HOLY, an eCommerce pet brand
5.0
Three Years of Reliable Delivery
Stellar has supported our Shopify store for two years, building backend functionality and custom tools. They’re fast, responsive, and reliable.
Matthew Burleton
Creative Director at Long Story Short
5.0
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.
Dimitry Toukhcher
CEO, LGFG Fashion House
5.0
Stellar transformed our sales processes, streamlining operations and automating manual work to save significant time and improve the overall customer experience.
Kelwin Fernandes
Owner at NILG.AI
5.0
Stellar stood out among five shortlisted companies with a detailed, transparent plan and pricing strategy. Jack also provided clear guidance and valuable insights.
Yousef Jaikat
Shopify & eCommerce Expert, Owner at Digitalebox.de
5.0
Stellar’s Shopify expertise and ability to deliver advanced custom solutions reflect strong technical skills and a focus on scalable, high-quality eCommerce.
Rebecca Wilson
Director of Marketing at Cooper Mountain Technologies
5.0
They bring a positive attitude and use their expertise to improve projects beyond the brief, considering key factors like SEO, responsiveness, and overall quality.
Tim Ito
Co-owner, Marketing Nice Guys
5.0
They consistently deliver on time and within budget, follow through on commitments, and stay proactive with communication - even when clients are slow to respond.
Ready to build a Shopify theme that helps your store perform more efficiently and achieve your business goals?
Vladimir Gubarev
COO and Co-founder
Jack Ananchenko
CТO and Co-founder
FAQ
Frequently Asked Questions
How can I tell if my store needs a custom solution instead of a ready-made template?
001.Can a new solution be developed without losing SEO, content, or my current store settings?
002.Will my team be able to manage the content independently after launch?
003.How does custom development affect store performance and conversion rates?
004.Can your services improve an existing store gradually instead of requiring a complete rebuild?
005.How do you ensure compatibility with future updates?
006.Can you implement a Figma design without compromising functionality or performance?
007.How is the development process organized, and how often will I receive progress updates?
008.Which post-launch support services are included?
009.Why should I invest in a custom solution when ready-made solutions already exist?
010.Blog
