Top API Development & Integration Firms

API development and integration firms build the interfaces that let software talk to other software, and wire up the ones that already exist. Work ranges from designing REST, GraphQL or gRPC APIs for a product or partner program to connecting payment gateways, CRMs, ERPs, shipping carriers, messaging platforms and banking or healthcare systems through their published APIs. Companies hire for it when staff retype data between two systems, when partners want programmatic access, or when a monolith is being split into services.

Compare firms here on the systems they have integrated before, the documentation they hand over, and how they handle authentication, versioning and outages when a third-party API fails.

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We evaluate companies on verified profile data: services, pricing, locations, and portfolio. Client reviews are being collected. We may earn a fee for some placements. How we rank and verify

8,490 Companies

List of the Best API Development & Integration Agencies

Codespade
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Codespade.com offers intelligent IT services tailored for expanding businesses, combining IT and digital marketing solutions to fulfill unique business requirements. Our key services include AI integrations, landing pages, content management systems (CMS), and e-commerce with integrated payment opti
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
30% Custom Web Application Development
20% API Development & Integration
13% Custom AI Chatbot Development
7% Cloud Consulting & SI
AI Summary
“Codespade provides tailored IT and digital marketing services, including AI integration, CMS, e-commerce solutions, and analytics, supporting business growth and unique requirements.”
Rocket Science Designs
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MB-Based Branding offers design, development, and automation services for teams needing a versatile individual who can manage nearly every aspect. I'm Rob Bond, a designer and developer from Winnipeg, operating at the crossroads of branding, web design, marketing, and automation. My focus is on aidi
Highlights
2-9
Employees
Winnipeg, Manitoba, Ca
Services Provided+19 Services
8% Logo Design
7% Brand Identity Design
2% Packaging Design
3% Graphic Design
AI Summary
“Rocket Science Designs, led by Rob Bond, provides comprehensive branding, design, development, and automation solutions for small businesses, emphasizing flexibility, transparency, and maintainability.”
Lambert Labs
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Lambert Labs specializes in software development and cloud computing with a focus on Python. We create various digital solutions for clients around the world in multiple industries. Our team of experts in Python and cloud computing is available to assist you with application development, web develop
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
London, England, Gb
Services Provided+1 Services
23% Custom Web Application Development
10% API Development & Integration
33% Cloud Consulting & SI
20% ETL Pipeline Development
AI Summary
“Lambert Labs delivers expert Python-driven software and cloud solutions, supporting global clients with application and web development, hosting, digital transformation, and cloud migration services.”
Search Marketing Group
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SMG is a comprehensive interactive marketing design and development agency. Our interdisciplinary approach to interactive marketing boosts performance through a methodical process involving data collection, analysis, and ongoing optimization. For websites, we create easy-to-manage, adaptable, and fu
Highlights
$100-149/hr
Avg Hourly Rate
10-49
Employees
Englewood Cliffs, New Jersey, Us
Services Provided+3 Services
20% Custom Web Application Development
15% API Development & Integration
10% Backend Development
5% E-Commerce Development
AI Summary
“Search Marketing Group is a full-service interactive marketing agency specializing in responsive websites, web applications, integrations, and automation to optimize operations and enhance customer engagement.”
Entirety Software
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Entirety Software is a software development firm that focuses on creating customized business management systems for small and medium-sized enterprises. We develop scalable ERP, CRM, and internal tools that fit seamlessly with your business workflows rather than forcing you to adjust to generic solu
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Services Provided+1 Services
20% Custom Web Application Development
15% API Development & Integration
15% ERP & CRM Development
25% CRM Consulting and SI
AI Summary
“Entirety Software specializes in developing customized, scalable ERP and CRM solutions for SMEs, enhancing workflows through automation, integration, and tailored internal tools across diverse industries.”
Softifyme
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Softifyme is a company that offers digital solutions focused on social media marketing, building brand awareness, and developing business growth strategies. They assist small businesses in improving their online visibility, increasing sales, and drawing in new customers by creating customized social
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Islamabad, Pk Punjab, Pk
Services Provided+1 Services
20% Mobile App Development (iOS & Android)
15% API Development & Integration
15% E-Commerce Development
25% Machine Learning Model Development
AI Summary
“Softifyme delivers tailored digital solutions, specializing in social media marketing, brand awareness, and growth strategies to enhance small businesses' online presence and customer engagement.”
webartPros
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WebArtPros develops high-performance web and mobile applications that foster business growth. Our expertise lies in creating tailored solutions, including SaaS dashboards, e-commerce platforms, iOS and Android applications, and AI-driven tools. Our Offerings Include: Custom Web Applications (React,
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Berlin, Berlin, De
Services Provided+1 Services
30% Custom Web Application Development
30% Mobile App Development (iOS & Android)
15% API Development & Integration
20% E-Commerce Development
AI Summary
“WebArtPros specializes in delivering tailored web and mobile applications, including SaaS, e-commerce, and AI-driven tools, ensuring rapid development and scalable digital solutions globally.”
smart-leap-recruiters
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SsmartLeap is a top-tier IT services and digital transformation firm focused on assisting businesses in speeding up their growth with innovative technology solutions. Specializing in software development, AI-driven solutions, and IT consulting, SsmartLeap collaborates with organizations to streamlin
Highlights
London, England, Gb
Services Provided+1 Services
15% API Development & Integration
15% Backend Development
13% Frontend Development
7% Mobile App Development (iOS & Android)
AI Summary
“SMART LEAP RECRUITERS LTD. is an IT services and digital transformation firm offering software development, AI solutions, and IT consulting to enhance business efficiency and growth.”
Lemberg Solutions
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Lemberg Solutions serves as a technology partner for businesses developing smart, interconnected, and scalable tech products. Our expertise lies in creating AI-powered software, embedded systems, IoT solutions, and cloud applications, assisting companies in turning intricate concepts into ready-to-l
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Lviv, Lviv, Ua
Services Provided+6 Services
15% Backend Development
10% Frontend Development
13% API Development & Integration
13% Custom Web Application Development
AI Summary
“Lemberg Solutions partners with businesses to develop AI-driven software, embedded systems, IoT, and cloud applications, transforming complex ideas into scalable, market-ready technology products.”
Velzosoft
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Velzosoft is a mobile app development firm that specializes in creating custom iOS and Android applications for businesses and startup founders across four continents. We have successfully delivered apps for clients in over 12 industries, including retail, hospitality, healthcare, fitness, real esta
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Multan, Pk
Services Provided
20% Custom Web Application Development
70% Mobile App Development (iOS & Android)
10% API Development & Integration
AI Summary
“Velzosoft develops custom iOS and Android apps worldwide, leveraging Flutter for efficient, cost-effective delivery across diverse industries with fixed budgets and client-focused collaboration.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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