Custom eCommerce Development Services

We develop custom eCommerce solutions that increase revenue by up to 50% and scale without platform constraints.

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120+
Successfully completed projects
95%
client satisfaction
3+
years average partnership duration
20+
countries USA/EU/UK markets
Why us

Professional Custom eCommerce Development Services

As eCommerce expands, standard platforms can limit commerce growth. Complex processes, integrations, and new markets require tailored services and solutions. We build custom eCommerce systems that reduce these limitations, optimize customer journeys, offer innovative solutions, and unify key processes within a single managed infrastructure, using modern development principles. With advanced integrations and automation, we reduce manual operations by up to 50% and simplify technical complexity. Our services allow businesses to operate efficiently, scale commerce without overburdening teams, and prioritize management, growth, and customer service.

OUR EXPERTISE

Custom eCommerce Development for Your Business

Full cycle of creating custom eCommerce development solutions: from architectural design, management, and automation to ensuring customer system reliability under practical conditions with modern solutions.

We analyze operational processes and design the architecture to create a system that is ready for scaling with minimal risk of technical failures.

Build solutions for complex business scenarios
Create flexible, custom app functionality
Reduce dependency on platform limitations
Design scalable architecture for future growth

We develop custom frontends and backends, which allow us to ensure full control over the product and reduce dependence on third-party platforms.

Build apps for Shopify and Adobe Commerce
Adapt solutions to your existing tech stack
Optimize platform-specific performance
Ensure reliable compatibility and scalability

We integrate ERP, CRM, PIM, and 3PL services into a unified infrastructure, minimizing manual processes and ensuring data integrity.

Design intuitive eCommerce user flows
Simplify complex customer interactions
Improve conversion across web and mobile
Align product logic with business goals

We perform a migration to a new platform, including data transfer and preservation of SEO performance, supporting traffic, customer profiles, and sales history.

Connect ERP, CRM, and 3PL systems
Integrate payment gateways and eCommerce tools
Automate data exchange between platforms
Reduce manual work and operational errors

We automate key business processes, which allows us to minimize manual labor and substantially increase operational efficiency.

Build reliable backend infrastructure
Develop fast and scalable APIs
Automate repetitive business processes
Improve data processing and system stability

We optimize speed and prepare the system for high loads to ensure stable operation even with traffic growth.

Optimize apps for high traffic and load
Improve performance and response times
Strengthen platform stability and reliability
Prepare infrastructure for future growth
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

Ca'Pietra: From Magento to Shopify Plus - Retail and a Native B2B Portal in One Store

We migrated Ca'Pietra’s B2C store and B2B portal from Magento to Shopify Plus, using native Shopify features and apps for trade workflows. B2C launched on time and budget; the trade portal followed on

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

The hard part wasn't the migration: BERING from Shopware to Shopify

A Danish watch and jewellery brand moved to Shopify with a full storefront redesign: a faster site, independent releases for the EU and the US, and localization the client's own team runs.

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

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
shopify

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 Products
200+
Price Variants
MINIMAL
Install Support
magento

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 time
100%
Live from day one
GREEN
Core Web Vitals under peak load
shopify

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.

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

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 Engagement
78.23%
Returning Customers
2.5%
Mobile Performance
magento

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 time
10+
Hours saved weekly
shopify

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 customers
0
Data Loss
$
Custom Subscriptions
shopify

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.

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

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 rating
130K+
Customer reviews
0
Downtime
shopify app

Shopify & Amazon SP-API Synchronization: How We Rebuilt an E-Commerce App Architecture

Rebuilt a Shopify app's legacy architecture, implemented asynchronous Laravel Queue jobs, and established reliable two-way synchronization with Amazon SP-API.

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

Checkout That Behaves Differently in Every Market

See how Stellar engineered a multi-market Magento 2 checkout with custom business logic, REST API integrations, and 2+ years of continuous support.

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

From Google Sheets to a Custom Shopify App: Automating Revenue Forecasting for eCommerce Merchants

Custom Shopify app replacing a Google Sheets-based forecasting workflow with automated order imports, an interactive dashboard, and alerts. See how!

AUTO
Data Processing
100%
Interactive Dashboard
STABLE
Autosacaling
Why us

Platforms & eCommerce Solutions We Develop

We build custom eCommerce apps that prioritize stability, seamless integration, a great user experience, and smooth management of your business and website. Our solutions deliver real results, powered by advanced development.

Five people in white hoodies giving thumbs up, smiling and standing together indoors.
01

Platforms & Architecture

We design solutions on Shopify, headless, or a custom stack with architecture adapted to business growth. ​

02

Seamless System Integrations

We integrate key services into a unified infrastructure for data synchronization and significant process automation.

03

B2B & Complex Business Logic

We implement complex sales scenarios that fully align with the company's unique operational cycles.

04

Global & Multi-Market eCommerce

We scale sales to international markets, considering local requirements and payment specifics.

Custom eCommerce Development Process

Our custom eCommerce development services cover the full development lifecycle — from business analysis and solution architecture to implementation, launch, integrations, and continuous optimization.

  • 01

    Analyze Business Needs

    We assess your business requirements, existing workflows, technical limitations, integrations, and growth goals to define the right custom eCommerce solution.

  • 02

    Define eCommerce Strategy

    We plan the platform architecture, functionality, technology stack, integrations, and user journeys around your business and operational requirements.

  • 03

    Design User Experience

    We design intuitive customer journeys and interfaces that simplify product discovery, purchasing, account management, and other key eCommerce interactions.

  • 04

    Build Custom Functionality

    We develop custom storefront features, backend logic, APIs, integrations, automation, and connections with ERP, CRM, payment, fulfillment, and other business systems.

  • 05

    Test & Launch

    We test functionality, integrations, performance, security, and critical purchasing flows before deploying the eCommerce solution to production.

  • 06

    Scale & Optimize

    We monitor performance, improve infrastructure, optimize conversion-critical functionality, and continuously extend the platform as your business grows.

Technologies and frameworks

Technology Stack for eCommerce App Development Services

We use modern tools and solutions to develop stable and scalable digital products.

Front-end

ReactNext.jsAngularVueNuxt

Back-end

PHPLaravelSymfonyJavaSpringNest.jsExpress.js

Mobile

React NativeFlutter

Databases

PostgreSQLMongoDBRedis

Cloud & Infrastructure

AWSGoogle CloudDockerKubernetesCI/CD

AI & Automation

OpenAI APILangChainAI Agents

APIs & Integrations

REST APIGraphQLWebhooksERP / CRM Integrations

Commerce Technologies

ShopifyShopify PlusMagentoWooCommerceHeadless Commerce

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.

Ready to eliminate technical limits and scale your eCommerce with a custom architecture?


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 to know if you need custom eCommerce or off-the-shelf?

001.

Will we need to rewrite the system as the business grows?

002.

How do you determine the correct architecture for our business?

003.

Will we be dependent on you after launch?

004.

How do you lower risks when switching to a new platform?

005.

How do you ensure stable CRM and accounting sync?

006.

Is it possible to start with an MVP and grow the system gradually?

007.

How does an owned platform affect company capitalization and value?

008.

Can the architecture adapt to new business models?

009.

How does custom tech ensure data security and platform independence?

010.
Blog

Trends, Innovations, and Expert Insights

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