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

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Fifteen Design
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The Fifteen team unites the talents of UX designers, web developers, and digital marketers to create digital experiences that effectively meet commercial goals. By leveraging the team's expertise, we ensure our strategies successfully attract website visitors through SEO, social media, or PPC, and o
Highlights
$1,000+
Min Project Size
10-49
Employees
Nottingham, England, Gb
Services Provided+1 Services
20% Custom Web Application Development
5% E-Commerce Development
5% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“Fifteen Design combines UX design, web development, and digital marketing to create effective digital experiences that attract visitors and drive conversions, ensuring continued project success.”
Croncode Technologies
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Croncode Technologies is a comprehensive digital agency that focuses on custom software, web and mobile app development, MVP creation, UI/UX design, Shopify e-commerce solutions, AI automation, and digital marketing. We collaborate with startups and expanding businesses to provide effective, high-qu
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Ahmedabad, Gujarat, In
Services Provided
35% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
15% E-Commerce Development
AI Summary
“Croncode Technologies is a versatile digital agency specializing in custom software, app development, UI/UX design, e-commerce, AI automation, and digital marketing for startups and growing businesses.”
Chicago Web
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We are at the forefront of creating an online presence. Our skilled developers are committed to assisting businesses in establishing a strong digital footprint and achieving their online objectives. Our range of services covers all facets of web development, including website design, frontend develo
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Chicago, Illinois, Us
Services Provided
15% E-Commerce Development
20% API Development & Integration
35% Frontend Development
30% Backend Development
AI Summary
“Chicago Web specializes in comprehensive web development services, delivering website design, frontend and backend programming, and database integration to strengthen businesses' digital presence.”
General Systems Corporation
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For more than 50 years, General Systems Corporation has delivered IT services to nonprofit organizations. Our technical and account management teams are well-versed in the language and culture of the nonprofit sector, dedicated to offering exceptional customer service. GSC collaborates closely with
Highlights
$5,000+
Min Project Size
10-49
Employees
Services Provided
17% Mobile App Development (iOS & Android)
17% API Development & Integration
33% Computer Vision Solutions
33% Web App UI Design
AI Summary
“General Systems Corporation provides specialized IT services to nonprofit organizations, combining technical expertise with personalized support to deliver consistent value and exceptional customer service.”
Mosaik
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Mosaik distinguishes itself in the Gold Coast region as a leading provider of Custom Software Solutions, Mobile App Development, and Web Development Services. Our dedication to Technical Excellence in Software is unparalleled, thanks to our skilled local team. By choosing Mosaik Software, you bypass
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Coomera, Queensland, Au
Services Provided
20% API Development & Integration
35% Custom Web Application Development
30% Mobile App Development (iOS & Android)
15% Frontend Development
AI Summary
“Mosaik offers comprehensive custom software, mobile app, and web development services in Gold Coast, emphasizing technical excellence, direct communication, transparency, and continuous client support.”
Xedrum
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We assist in advancing the software development industry by enhancing and automating its processes! The Xedrum team specializes in the development, maintenance, and integration of web and mobile applications. Our dedicated team can readily enhance software development firms by offering swift and hig
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Wilmington, Delaware, Us
Services Provided+6 Services
15% Backend Development
15% API Development & Integration
15% Custom Web Application Development
5% Mobile App Development (iOS & Android)
AI Summary
“Xedrum specializes in full-stack web and mobile application development, offering high-quality, efficient solutions to advance and automate software development processes, embracing digital trends and user-friendliness.”
DHANAMITRA INFOTECH LLP
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At Dhanamitra Infotech, we offer outstanding IT services, such as website and software development, stock analysis training, and more. Our goal is to support your success in the digital landscape.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
35% Custom Web Application Development
25% API Development & Integration
20% E-Commerce Development
20% Mobile App Development (iOS & Android)
AI Summary
“Dhanamitra Infotech LLP delivers expert IT solutions including website and software development, alongside stock analysis training, empowering clients to thrive in the digital arena.”
MyData Insights Pvt Ltd
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Today, many organizations possess data, and numerous ones utilize dashboards. However, only a small fraction have systems that convert insights into actionable steps. At MDI UAE, we assist businesses in progressing beyond mere reporting to achieve real-time decision-making and automated execution. Y
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Visakhapatnam, Andhra Pradesh, In
Services Provided+12 Services
1% Other IT Consulting and SI
2% BI & Big Data Consulting & SI
1% IT Staff Augmentation
1% Custom AI Chatbot Development
AI Summary
“MyData Insights Pvt Ltd enables businesses across industries to unify data, leverage AI for decision intelligence, and automate workflows, transforming insights into timely, actionable outcomes with minimal disruption.”
Consensus Innovations
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Consensus Innovations is a bespoke software development firm that focuses on creating AI-driven platforms for businesses that require more than standard solutions. Our skilled engineers provide secure and scalable systems, ensuring a solid emphasis on design and data protection. We offer comprehensi
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Praha-Kunratice, Cz
Services Provided+1 Services
13% API Development & Integration
20% Custom Web Application Development
7% Custom AI Chatbot Development
27% Generative AI
AI Summary
“Consensus Innovations specializes in custom AI-driven software solutions, delivering secure, scalable systems and intelligent automation tailored for diverse industries including FinTech, AI, and Big Data.”
Solcre Software & Staff Augmentation
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We are Solcre, a nearshore technology consulting firm dedicated to helping organizations expedite their digital transformation through tailored software development and staff augmentation. We act as a genuine extension of our clients’ teams, embedding ourselves in their processes, tools, and culture
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Montevideo, Montevideo, Uy
Services Provided+6 Services
15% API Development & Integration
13% Legacy System Modernization
15% Custom Web Application Development
8% Mobile App Development (iOS & Android)
AI Summary
“Solcre Software & Staff Augmentation is a nearshore technology consulting firm offering tailored software development, staff augmentation, system integration, and digital transformation to enhance scalability and efficiency.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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