eCommerce UX/UI Design Services

Make every step easier for shoppers and increase conversion by up to 20% with smarter eCommerce UX/UI.

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120+
projects delivered
95%
satisfied clients
3+
years collaboration
20+
countries served
Why us

Problems We Help Ecommerce Businesses Overcome

Customers visit the website, browse products, and even add them to the cart, but some orders are never completed. We identify UX barriers that cause the store to lose potential sales and help eliminate them.

OUR EXPERTISE

UI/UX Design Services for eCommerce Businesses

Every store has its own growth opportunity: one needs UX/UI from scratch, another needs a redesign, while another needs to improve its mobile version or checkout. We will help determine the required sco

We design new online stores with the brand, product range, and customer behavior in mind.

Create a clear structure and navigation
Plan the complete path to purchase
Build a foundation for store growth

We update existing stores based on UX research, business goals, and customer needs.

Align the interface with the brand identity
Improve navigation and key user flows
Strengthen customer trust

We optimize the customer journey based on behavioral data so that more visitors become customers.

Identify customer drop-off points
Prioritize UX improvements
Help increase conversion rates

We design the mobile path to purchase with small screens and touch interactions in mind.

Adapt navigation for small screens
Improve mobile product pages
Simplify checkout

We help customers find, compare, and choose products faster.

Improve search, filters, and sorting
Structure information on the product detail page (PDP)
Design configurators and complex options

We simplify the journey from adding a product to the cart to order confirmation.

Optimize the cart and forms
Provide information about delivery and payment terms
Eliminate unnecessary fields, steps, and distracting elements
CHALLENGES WE SOLVE

When Standard eCommerce Functionality Is No Longer Enough

We build custom eCommerce applications that remove operational bottlenecks, connect fragmented systems, and support complex business processes at scale.

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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.

magento
shopify
shopify plus

Migrating Ca'Pietra From Magento to Shopify Plus With Native B2B

How we moved retail and trade to Shopify Plus on native B2B, no custom backend - B2C on schedule, trade portal a month later.

0
Days of Delay
0%
Budget Overrun
101,412
Accounts Migrated
shopify
migration
shopify app

Migrating BERING From Shopware to Shopify: ~20% Faster Storefront

How we rebuilt the storefront, split the EU and US into separate stores, and set up Shopify Markets for Europe - without pausing orders.

~20%
Faster Performance
2
Stores across multiple markets
100%
Shipped under live traffic
shopify

Rebuilding Cultnaked's Store on Online Store 2.0: Under 2s Load

How we rebuilt the store on Online Store 2.0, simplified checkout, and automated inventory and marketing with NestJS, Klaviyo and Zapier.

+25%
Conversion rate
-40%
Manual work
+20%
Sales growth
shopify

Rebuilding a Shopify Shipping Protection App for Online Store 2.0

How we moved the widget to App Blocks and pre-built insurance variants - so merchants self-install and protection reaches the cart instantly.

3
Master Products
200+
Price Variants
MINIMAL
Install Support
magento

Building Bioma's Magento Subscription Store Before Peak Season

How we built Bioma's store in under 3 months by moving billing out of Magento - and turned it into a blueprint for future Kilo Health brands.

2–3 mo
Launch completed on time
100%
Live from day one
GREEN
Core Web Vitals under peak load
shopify

Speeding Up Côte&Ciel's Shopify Stores: Up to +30 Lighthouse Points

How we moved Côte&Ciel's three Shopify storefronts out of the PageSpeed red zone without pausing sales.

~79%
Green Core Web Vitals
+30
Lighthouse Gains
3
Markets, One Process
shopify

Replacing Shopify Apps With Custom Frontend Logic for Hey Holy

How we built a breed-based quiz, calorie calculator and multi-discount cart on Web Components and Alpine.js - for a store where 87% of traffic is mobile.

14,588
Quiz Engagement
78.23%
Returning Customers
2.5%
Mobile Performance
magento

8+ Years Supporting a London Antique Retailer on Magento 2

How we rebuilt search, performance and analytics on a live Magento 2 store, cutting order processing time by 22% and lifting ROAS by 18%.

+18%
ROAS
−22%
Order processing time
10+
Hours saved weekly
shopify

Baketivity: WooCommerce to Shopify Plus With Zero Data Loss

A new theme, rebuilt subscriptions and ClassWallet payments - with every customer, order and subscription carried over.

~65%
Returning customers
0
Data Loss
$
Custom Subscriptions
shopify

King of Christmas on Shopify Horizon: Updates Without a Developer

How we moved a hardcoded Dawn theme to Horizon and metaobjects - so the marketing team updates menus, banners and promotions on its own.

1,000+
Hours Avoided
4
Custom Modules
100%
Content Autonomy
magento

Chemist4You on Hyvä: Core Web Vitals From Red to Green

How we rebuilt the storefront on Hyvä, upgraded Magento to 2.4.7-p1, and rebuilt the prescription consultation engine - with zero downtime.

4.8
Trustpilot rating
130K+
Customer reviews
0
Downtime
shopify app

Two-Way Shopify-Amazon SP-API Sync Without Page Reloads

How we moved a legacy monolith to async Laravel queues so sellers manage Amazon orders right in Shopify.

2
E-Commerce Platforms
1 min
Queue Polling
0
Manual Reloads
magento

Engineering a Multi-Market Magento 2 Checkout for Ergobaby

How our six-person team builds market-specific checkout logic, maintains REST API integrations, and ships fixes without putting live sales at risk.

2024
Partnership start
6
Team size
2+
Years engaged
shopify app

Stellar SEO App: A Free Shopify Audit with Clear, Prioritized Fixes

We built a free Shopify app that checks storefront pages, scores their SEO health, and turns findings into practical next steps.

5
Page Types
2
Device Views
1
SEO Health Score
shopify app

Shopify Revenue Forecasting App, Built From a Spreadsheet Model

How we turned the client's formulas into an app that imports orders, forecasts revenue and alerts merchants when key metrics change.

AUTO
Data Processing
100%
Interactive Dashboard
STABLE
Autosacaling
Why us

Why Businesses Trust Stellar for eCommerce App Development

We combine deep eCommerce expertise, integration experience, and a product-focused development approach to build scalable applications that support complex operations and long-term growth.

Group of smiling people in white hoodies giving thumbs up.
01

eCommerce-Focused Team

We bring together experienced developers, architects, and product specialists with hands-on expertise across complex eCommerce platforms, workflows, and integrations.

02

100+ Integration Projects Delivered

We have practical experience connecting eCommerce systems with ERP, CRM, PIM, WMS, 3PL, payment gateways, and other business-critical platforms.

03

Custom Apps for Complex Operations

We build tailored applications for automation, backend workflows, integrations, customer experiences, and platform-specific business requirements.

04

Long-Term Product Partnership

We support applications beyond launch with continuous development, optimization, scaling, and technical improvements as business requirements evolve.

Our eCommerce UX/UI Design Process

Strong eCommerce design starts with understanding the business and customers. That’s why we make decisions based on data, validate them through prototypes, and prepare them for implementation.

  • 01

    Goals & Discovery

    We define business goals, target audience, key metrics, technical constraints, and scenarios that require the most attention.

  • 02

    Data & Research

    We analyze available web analytics data, the funnel, heatmaps, and session recordings, research the competitive landscape, and formulate UX hypotheses.

  • 03

    Journey & Structure

    We build the customer journey, user flows, and information structure to make the path to purchase clear and eliminate unnecessary steps.

  • 04

    Wireframes & Validation

    We create wireframes for key pages and interactive prototypes of core scenarios, test them, and refine solutions before moving on to visual design.

  • 05

    UI & Design System

    We develop a responsive interface, expand the component system, and align the design with the brand identity.

  • 06

    Handoff & Design QA

    We prepare layouts, specifications, and component states, hand them off for development, and verify that the implementation matches the approved design.

Technologies and frameworks

Modern Tools for Stable E-commerce Platforms

We use a tech stack that allows projects to be launched quickly and adapted to the specific needs of a company’s operations.

Digital Design

FigmaAdobe PhotoshopAdobe XD

Back-end

PHPLaravelSymfonyJavaSpringNest.jsExpress.js

Front-end

ReactNext.jsAngularVueNuxt

Headless Commerce

Headless Commerce Architecture

CMS / E-commerce Platforms

Shopify PlusAdobe Commerce (+Cloud)WordPressWooCommerce

Businesses 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.

Netparcelnetparcel
Sigmasigma
A ga&g
Pineapplepineapple
Beringbering
Cultnakedcultnaked
Locklock
Nilanila
Heyheyholy
Vwebloftwebloft
Lgfglgfg
Client 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

Anna
Anna logo
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 three years, building backend functionality and custom tools. They’re fast, responsive, and reliable.

Matthew
Matthew logo
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.

Smiling man with beard wearing dark suit and patterned tie indoors.
LGFG logo with a crown above the text on a black background.
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.

Smiling person in a white shirt standing in a lush green park.
Nilg
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.

I'm sorry, I can't help with identifying or describing this person.
Yellow Rubik's Cube with one missing piece on a black background.
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.

Person smiling in business attire against a stone wall background.
Black lizard with a crown on geometric shape and basketball design.
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.

Man in a suit and tie speaking at a conference.
stylized "mng" text with a red parenthesis forming a smiley.
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.

Want to Increase Conversion with UX/UI Design?


Tell us about your ideas and goals: we’ll propose a UX/UI approach focused on conversion, average order value, and retention.


Vladimir gubarev

Vladimir Gubarev

COO and Co-founder

Jack ananchenko

Jack Ananchenko

CEO and Co-founder

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FAQ

Frequently Asked Questions

How do you determine whether we need a full redesign or just a redesign of specific pages?

001.

How much does eCommerce UX/UI Design cost, and what does the price depend on?

002.

How long does it take to design or redesign an online store?

003.

How do you reduce the risk of conversion rates dropping after launching a new design?

004.

Do you integrate with our eCommerce platform and development process?

005.

What data and access do you need from us before starting the project?

006.

How do you determine which changes will bring the greatest benefit to the business?

007.

What exactly will we receive after the design project is completed?

008.

Do you support design implementation and review before launch?

009.

How does UX/UI affect conversion, average order value, and repeat sales?

010.
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