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Top API Development Companies in 2026

Compare e-commerce companies offering API Development. Review platform expertise, industries served, team size, pricing signals, case studies and approved client feedback before selecting a provider for your project.

189 matching companies Structured company data Approved reviews only How Ecostaff evaluates directory data
No reviews yet

Swanky is a Shopify-focused ecommerce agency founded in 2010 and headquartered in Exeter, United Kingdom. The company works with ambitious mid-market and enterprise brands on Shopify and Shopify Plus, covering replatforming, custom development, UX and design, conversion optimization, international expansion,...

Services
API DevelopmentConversion Rate OptimizationCustom Ecommerce DevelopmentEcommerce App Development
Platforms
ShopifyShopify Plus
Minimum project
Not disclosed
Hourly rate
Not disclosed
Team size
51-100 employees
Headquarters
Exeter, England, United Kingdom
No reviews yet

Vaimo is a Stockholm-headquartered digital commerce and experience agency founded in 2008. The company has grown to more than 650 team members across 15 markets and works with brands, manufacturers and retailers on commerce, content, data and customer experience. Its...

Services
API DevelopmentB2B Ecommerce DevelopmentB2C Ecommerce DevelopmentCloud and DevOps
Platforms
Adobe CommercecommercetoolsMagento
Minimum project
$100,000+
Hourly rate
$100-149/hr
Team size
501-1000 employees
Headquarters
Stockholm, Stockholm County, Sweden
No reviews yet

CoSpark is a US WooCommerce and WordPress development agency founded in 2009, with its West Coast office in Irvine, California and an East Coast office in Fredericksburg, Virginia. The company focuses on complex WooCommerce engineering, custom plugins, integrations, migrations, maintenance,...

Services
API DevelopmentCloud and DevOpsCore Web Vitals OptimizationCustom Ecommerce Development
Platforms
WooCommerce
Minimum project
$10,000+
Hourly rate
$150-199/hr
Team size
11-50 employees
Headquarters
Irvine, California, United States
No reviews yet

Underwaterpistol is a London ecommerce agency with more than two decades of digital delivery experience. It specializes in Shopify and Shopify Plus strategy, design, development, migration, integrations, subscription commerce, conversion work and long-term support for consumer brands.

Services
API DevelopmentConversion Rate OptimizationCustom Ecommerce DevelopmentEcommerce Consulting and Strategy
Platforms
ShopifyShopify Plus
Minimum project
Not disclosed
Hourly rate
Not disclosed
Team size
11-50 employees
Headquarters
London, England, United Kingdom
No reviews yet

Propeller is a London digital agency with ecommerce strategy, design and development capabilities across Shopify and Shopify Plus. The agency works with hospitality, food, retail and consumer brands that want a polished digital experience tied to measurable growth rather than...

Services
API DevelopmentConversion Rate OptimizationCustom Ecommerce DevelopmentEcommerce Consulting and Strategy
Platforms
ShopifyShopify Plus
Minimum project
Not disclosed
Hourly rate
Not disclosed
Team size
11-50 employees
Headquarters
London, England, United Kingdom
No reviews yet

Avex is a New York ecommerce agency that helps established brands modernize technology and improve customer experience. Its Shopify services span strategy, UX and UI, engineering, migration, system integration, conversion optimization, analytics, retention, loyalty and international expansion.

Services
Analytics and TrackingAPI DevelopmentConversion Rate OptimizationCustom Ecommerce Development
Platforms
ShopifyShopify Plus
Minimum project
Not disclosed
Hourly rate
Not disclosed
Team size
51-100 employees
Headquarters
New York, United States
No reviews yet

Domaine is a global Shopify agency formed from the merger of Tomorrow and Half Helix and later expanded through acquisitions. It provides strategy, creative, technology and marketing for large-scale Shopify migrations, unified commerce, enterprise storefronts, optimization and international growth.

Services
API DevelopmentCustom Ecommerce DevelopmentData MigrationEcommerce Consulting and Strategy
Platforms
ShopifyShopify Plus
Minimum project
Not disclosed
Hourly rate
Not disclosed
Team size
251-500 employees
Headquarters
New York, United States
No reviews yet

G & Co. is a retail and ecommerce consulting agency focused on strategy, customer experience, digital product and design. The firm works with established consumer brands where the ecommerce challenge is often broader than selecting or implementing a platform, encompassing...

Services
Analytics and TrackingAPI DevelopmentConversion Rate OptimizationCustom Ecommerce Development
Platforms
ShopifyShopify Plus
Minimum project
Not disclosed
Hourly rate
Not disclosed
Team size
LinkedIn company size: 51-200 employees
Headquarters
New York, United States
No reviews yet

wecanfly is a Shopify Plus agency with migration, B2B and custom development expertise for European brands. The company works with ecommerce brands that need complex platform moves, international stores and wholesale functionality on Shopify, with official project material showing hands-on...

Services
Analytics and TrackingAPI DevelopmentB2B Ecommerce DevelopmentConversion Rate Optimization
Platforms
ShopifyShopify Plus
Minimum project
Not disclosed
Hourly rate
Not disclosed
Team size
51-100 employees
Headquarters
Wroclaw, Lower Silesian, Poland
No reviews yet

Unified is a UK ecommerce agency delivering Shopify, Magento and multichannel digital commerce programs. The company works with ecommerce brands that need retailers that need replatforming, B2B workflows and design-led digital transformation, with official project material showing hands-on delivery rather...

Services
Analytics and TrackingAPI DevelopmentB2B Ecommerce DevelopmentConversion Rate Optimization
Platforms
MagentoShopifyShopify Plus
Minimum project
Not disclosed
Hourly rate
Not disclosed
Team size
51-100 employees
Headquarters
London, England, United Kingdom
No reviews yet

Ambaum is a Shopify consultancy and development partner providing fractional technical leadership and complex implementation. The company works with ecommerce brands that need brands that need senior Shopify architecture, custom logic and long-term technical ownership, with official project material showing...

Services
API DevelopmentB2B Ecommerce DevelopmentConversion Rate OptimizationCustom Ecommerce Development
Platforms
ShopifyShopify Plus
Minimum project
Not disclosed
Hourly rate
Not disclosed
Team size
11-50 employees
Headquarters
Seattle, Washington, United States
No reviews yet

Praella is a global Shopify agency headquartered in Chicago for its North American operations, with teams across Europe and India. The company delivers D2C, B2B, hybrid and subscription commerce through strategy, UX design, web and app development, migrations, integrations and...

Services
API DevelopmentCustom Ecommerce DevelopmentData MigrationEcommerce App Development
Platforms
ShopifyShopify Plus
Minimum project
Not disclosed
Hourly rate
Not disclosed
Team size
101-250 employees
Headquarters
Chicago, Illinois, United States
No reviews yet

Chilliapple is a UK ecommerce development agency with WooCommerce, Magento and integration experience. The company works with ecommerce brands that need merchants that need custom purchasing logic and connections between ecommerce and operational systems, with official project material showing hands-on...

Services
API DevelopmentB2B Ecommerce DevelopmentCustom Ecommerce DevelopmentEcommerce App Development
Platforms
MagentoShopifyShopify Plus
Minimum project
Not disclosed
Hourly rate
Not disclosed
Team size
11-50 employees
Headquarters
Tunbridge Wells, England, United Kingdom
No reviews yet

Radiant is an ecommerce agency or consultancy based in Birmingham, United Kingdom. It focuses on custom Shopify Plus development, systems integration, ecommerce strategy, conversion optimization and growth. Its active public website and service positioning were reviewed for this Ecostaff dataset...

Services
Analytics and TrackingAPI DevelopmentConversion Rate OptimizationCustom Ecommerce Development
Platforms
ShopifyShopify Plus
Minimum project
Not disclosed
Hourly rate
Not disclosed
Team size
11-50 employees
Headquarters
Birmingham, England, United Kingdom
No reviews yet

PureNet is a UK ecommerce consultancy and implementation agency working across Shopify, integrations and bespoke digital commerce. The company works with ecommerce brands that need retailers that need platform migration, complex catalogues and practical operational integration, with official project material...

Services
Analytics and TrackingAPI DevelopmentB2B Ecommerce DevelopmentConversion Rate Optimization
Platforms
Adobe CommerceMagentoShopify
Minimum project
Not disclosed
Hourly rate
Not disclosed
Team size
LinkedIn company size: 51-200 employees
Headquarters
York, England, United Kingdom