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

Neebal Technologies Pvt Ltd
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Welcome to Neebal - Your Leading Provider of Product Engineering Solutions. We prioritize innovation and teamwork, featuring a talented team of exceptional engineers and designers. Our thorough recruitment process ensures we bring on individuals who share our commitment to client focus and quality.
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Mumbai, Maharashtra, In
Services Provided+5 Services
14% API Development & Integration
7% Legacy System Modernization
3% Blockchain & Web3 Development
10% Mobile App Development (iOS & Android)
AI Summary
“Neebal Technologies Pvt Ltd. delivers innovative product engineering solutions through expert engineers, emphasizing client focus, cultural compatibility, and flexible outsourcing strategies to drive digital growth.”
Code24x7
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Code24x7 is a comprehensive software development firm dedicated to providing innovative solutions in the B2B, enterprise, e-commerce, and blockchain fields. We excel at creating customized web and mobile applications, incorporating advanced technologies such as AI/ML and Web3, and enhancing digital
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
30% Custom Web Application Development
20% Mobile App Development (iOS & Android)
15% API Development & Integration
20% E-Commerce Development
AI Summary
“Code24x7 is a software development firm specializing in customized web, mobile, e-commerce, blockchain, and AI/ML solutions, delivering scalable, secure, and innovative technologies for diverse industries.”
Nostalgic Studio
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Nostalgic Studio is a leading digital agency located in Johannesburg, South Africa, focusing on effective web design, SEO, and digital marketing. We support startups and medium enterprises by providing customized, mobile-responsive websites, scalable e-commerce solutions, and impactful branding. Our
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Midrand, Gauteng, Za
Services Provided+9 Services
20% API Development & Integration
2% Content Marketing Strategy
3% Ecommerce Marketing
3% Digital Strategy
AI Summary
“Nostalgic Studio, a Johannesburg-based digital agency, delivers tailored web design, e-commerce, SEO, and digital marketing solutions to boost startups and medium enterprises' online presence.”
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Mike the Automator
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Mike the Automator is your dedicated expert in enhancing business efficiency. Drawing inspiration from traditional craftsmen and exceptional hospitality, Mike creates and implements tailored automation solutions that free you from monotonous tasks, allowing you to concentrate on strategic initiative
Highlights
$1,000+
Min Project Size
$150+/hr
Avg Hourly Rate
Luquillo, Pr
Services Provided+1 Services
30% Custom Web Application Development
20% API Development & Integration
35% Robotic Process Automation (RPA)
5% Machine Learning Model Development
AI Summary
“Mike the Automator specializes in bespoke automation solutions that boost productivity, minimize errors, and support scalable growth, delivering tailored, detail-oriented service globally with expert collaboration.”
CODE AT IT
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CODE AT IT (Codeatit) is a Romanian software engineering firm that specializes in creating secure, high-availability systems for FinTech and regulated industries. We develop robust Java/Spring Boot microservices, upgrade legacy systems, and deploy IAM/SSO solutions (OIDC/OAuth2/JWT/SAML) while adher
Highlights
$50,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
18% API Development & Integration
10% Custom Web Application Development
2% E-Commerce Development
20% Legacy System Modernization
AI Summary
“CODE AT IT is a Romanian software engineering firm delivering secure, reliable software solutions—from architecture to cloud deployment—for FinTech and regulated industries, specializing in Java microservices and identity management.”
Convergent Software
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Convergent Software is a custom software development firm located in the U.S. that focuses on developing full-stack platforms, integrating AI, and creating mobile and web applications. Having completed over 50 projects in the healthcare, AI, and business sectors, our experienced engineering team cra
Highlights
$5,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Spring Hill, Tennessee, Us
Services Provided+1 Services
20% Custom Web Application Development
18% API Development & Integration
12% Mobile App Development (iOS & Android)
28% AI Agent & Multi-Agent System Development
AI Summary
“Convergent Software is a U.S.-based custom software firm specializing in full-stack development, AI integration, and mobile/web applications, delivering secure, production-ready solutions across healthcare, AI, and business sectors.”
Appery.io
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Appery.io is a low-code platform for app development that enables users to easily create high-quality hybrid mobile apps, web applications, and progressive web apps (PWAs). It features a browser-based interface hosted on Amazon Web Services (AWS), eliminating the need for installation or upkeep. App
Highlights
10-49
Employees
Walnut Creek, California, Us
Services Provided
40% Mobile App Development (iOS & Android)
25% Custom Web Application Development
25% Progressive Web App (PWA) Development
10% API Development & Integration
AI Summary
“Appery.io is a cloud-based low-code platform enabling rapid development of hybrid mobile, web, and progressive web apps with integrated backend services and seamless API integration.”
Remote Flags
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Remote Flags is a self-sufficient software agency founded in 2022 and located in Porto, Portugal. We specialize in creating IT and software projects, overseeing the management, design, development, and delivery of comprehensive software platforms.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Porto, Porto, Pt
Services Provided
14% API Development & Integration
20% Custom Web Application Development
33% Cloud Consulting & SI
33% DevOps Engineering
AI Summary
“Remote Flags is a Portugal-based software agency founded in 2022, specializing in managing, designing, developing, and delivering complete IT and software projects.”
L & M Prod.
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L&M Prod consists of a pair of specialists in mobile and web development, product design, and growth strategy. We create applications that drive genuine revenue for your business. **Discovery & Strategy:** Together, we identify your requirements, objectives, and the most effective approach to your
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Torino, Piedmont, It
Services Provided+2 Services
30% Custom Web Application Development
30% Mobile App Development (iOS & Android)
15% API Development & Integration
10% E-Commerce Development
AI Summary
“L&M Prod specializes in mobile and web development, product design, and growth strategy, delivering tailored applications with comprehensive discovery, design, development, and maintenance services to boost business revenue.”
Brava Software Solutions
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At Brava Software Solutions, we are a dedicated team of innovators excited by new challenges and committed to expanding our knowledge. We actively pursue projects that not only match our technical expertise but also inspire our creativity and promote both personal and professional development. For u
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
28% Custom Web Application Development
15% API Development & Integration
7% Mobile App Development (iOS & Android)
50% Search Engine Optimization (SEO)
AI Summary
“Brava Software Solutions specializes in innovative, tailored software development, focusing on collaborative, thoughtful strategies to deliver transformative, efficient solutions that empower organizations and meet diverse business needs.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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