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

Liventus
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Liventus is a company focused on technology modernization, automation, and decision intelligence, particularly in complex sectors with strong expertise in Artificial Intelligence, equipment finance, lending, fintech, and healthcare. Established in 2001 and based in Northbrook, Illinois, Liventus has
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Chicago, Illinois, Us
Services Provided+5 Services
15% Custom Web Application Development
14% API Development & Integration
5% E-Commerce Development
7% AI Strategy & Roadmap Consulting
AI Summary
“Liventus specializes in technology modernization, automation, and AI-driven decision intelligence for finance, healthcare, and manufacturing sectors, delivering scalable solutions with strategic onshore-offshore partnerships.”
ITEASY Sp. z o.o.
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We are an agile company focused on IT, delivering cutting-edge solutions across various sectors. Our expertise and experience empower us to assist our clients in reaching their business objectives effectively. What are our areas of expertise? 1. **Property Management**: We provide a robust propert
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Lodz, Lodz, Pl
Services Provided+1 Services
30% Custom Web Application Development
18% API Development & Integration
2% CMS Development & Customization
35% Product UX Strategy
AI Summary
“ITEASY Sp. z o.o. delivers agile IT solutions across property management and industry logistics, offering tailored systems that enhance operations, automation, and digital business success.”
Blueprint Solution LLC
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We develop software solutions by integrating our professionals' expertise with efficient and streamlined processes.
Highlights
$25,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
25% API Development & Integration
40% Custom Web Application Development
15% E-Commerce Development
20% Mobile App Development (iOS & Android)
AI Summary
“Blueprint Solution LLC delivers comprehensive software solutions by combining expert knowledge with streamlined processes to meet diverse client needs efficiently and effectively.”
Two Bit Solutions LLC
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We are a small development team established by two seasoned engineers with over 20 years of experience in dynamic, agile startup settings. As C-level engineers, we are passionate about designing, building, and solving problems. Allow us to assist you in bringing your vision to life from concept to l
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Brooklyn, New York, Us
Services Provided+1 Services
8% E-Commerce Development
12% Mobile App Development (iOS & Android)
15% API Development & Integration
15% Custom Web Application Development
AI Summary
“Two Bit Solutions LLC is a seasoned engineering team specializing in agile software development, offering end-to-end solutions from concept design to project launch for diverse clients.”
41Labs
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We focus on providing AI software development services. Our skilled team can assist you in leveraging artificial intelligence to revolutionize your business.
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+5 Services
8% Custom AI Chatbot Development
6% LLM Integration & Prompt Engineering
5% Machine Learning Model Development
3% AI Strategy & Roadmap Consulting
AI Summary
“41Labs specializes in AI software development, delivering expert solutions to help businesses harness artificial intelligence for enhanced innovation and operational efficiency.”
Techwondoe
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Techwondoe is a group of dedicated and skilled software product developers. We collaborate with businesses of all sizes to enhance the efficiency and speed of their product development journeys.
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided
45% Custom Web Application Development
35% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“Techwondoe is a skilled software product development group collaborating with businesses of all sizes to improve efficiency and accelerate product development processes.”
Pack Technology
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PACK TECHNOLOGY Ltd assists companies and agencies in efficiently and reliably completing software projects. We serve as an execution partner for teams looking to expedite their delivery without the delays associated with hiring or managing more developers. Whether you're launching a new product, ta
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
45% Custom Web Application Development
35% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“PACK TECHNOLOGY Ltd partners with companies to accelerate software development by managing projects end-to-end, offering flexible collaboration, reliable delivery, and streamlined communication to meet deadlines effectively.”
T MEDIA GROUP
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Hi there, We are the exclusive Webflow Premium Partner in the Baltic region, dedicated to assisting teams in creating scalable, growth-oriented websites optimized for performance and conversion. We prioritize clean and maintainable designs alongside user experience, ensuring that your site not only
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Riga, Lv
Services Provided+2 Services
25% Custom Web Application Development
5% Mobile App Development (iOS & Android)
20% API Development & Integration
25% Product UX Strategy
AI Summary
“T MEDIA GROUP is the Baltic region's exclusive Webflow Premium Partner, specializing in scalable, performance-driven website design focused on usability, conversion, and sustainable growth.”
Remote Reason
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We create software for both people and bots, offering services in strategy, product development, and engineering. **AI Strategy** We strategically incorporate AI features to enhance customer experience and add value to your business. **AI Go To Market** We enhance your growth team with AI in
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Koog aan de Zaan, North Holland, Nl
Services Provided+1 Services
13% API Development & Integration
20% Custom Web Application Development
17% Mobile App Development (iOS & Android)
20% AI Strategy & Roadmap Consulting
AI Summary
“Remote Reason delivers comprehensive software solutions, integrating AI strategy, engineering, mobile and web app development to optimize business growth and customer experiences.”
Sketch Development
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While we’re new to Clutch, we have a solid reputation among Fortune 500 companies. Sketch assists software teams that operate with tight margins for error in delivering effective software more quickly by concentrating on eight essential outcomes. Our clients range from startups in cybersecurity and
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Webster Groves, Missouri, Us
Services Provided+6 Services
15% API Development & Integration
25% Custom Web Application Development
10% Mobile App Development (iOS & Android)
5% AI Agent & Multi-Agent System Development
AI Summary
“Sketch Development delivers custom software solutions across industries including cybersecurity, finance, and healthcare, helping teams with tight margins achieve critical outcomes efficiently.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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