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

Codseg LLC
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Software solutions: iOS, Android, and Web platforms.
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Karur, Tamil Nadu, In
Services Provided+9 Services
10% Mobile App Development (iOS & Android)
4% E-Commerce Development
3% Legacy System Modernization
5% API Development & Integration
AI Summary
“Codseg LLC specializes in software development, delivering innovative solutions across iOS, Android, and web platforms to meet diverse client needs with technical expertise and reliability.”
ShreeNXT
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ShreeNXT is an up-and-coming IT solutions company in India, focusing on innovative concepts and delivering advanced technology to our clients. We leverage our expertise to offer IT solutions across a broad spectrum, particularly in the software services sector. Our diverse range of solutions caters
Highlights
$25-49/hr
Avg Hourly Rate
Services Provided+11 Services
5% API Development & Integration
9% Custom Web Application Development
5% Mobile App Development (iOS & Android)
4% E-Commerce Development
AI Summary
“ShreeNXT is an emerging Indian IT solutions provider delivering innovative software services worldwide, fostering technical excellence and comprehensive technology-driven business growth for diverse clients.”
Nimbark Web & App development
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Web & Mobile App Development Specialist | AI Developer | AI SaaS 💼 Ranked in the top 3% of Mobile & Web Developers on Upwork | Over 100 apps created | More than 8 years of experience | 2,000+ hours worked. Why Work With Me: Mobile Applications: Cross-platform solutions (React Native, Flutter), AI-i
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+16 Services
8% Mobile App Development (iOS & Android)
5% E-Commerce Development
2% ERP & CRM Development
5% API Development & Integration
AI Summary
“Nimbark Web & App Development specializes in web, mobile, and AI-powered applications, offering full-stack development, e-commerce, and advanced integrations with over eight years' experience.”
Zenon
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Achieve exceptional growth and success with innovative digital solutions designed to enhance every aspect of your business, transforming operations and boosting your competitive edge.
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Services Provided+18 Services
5% Custom Web Application Development
3% API Development & Integration
3% Frontend Development
3% Mobile App Development (iOS & Android)
AI Summary
“Zenon specializes in innovative digital solutions that optimize business operations, drive growth, and enhance competitive advantage across diverse industries and functions.”
CodeHunterss
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We Transform Your Ideas into Reality... At "CODEHUNTERSS," we have assisted numerous concepts in becoming successful online businesses. This is why our clients consistently select us for their custom web design, advanced web application development, and mobile app development needs.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+11 Services
7% Mobile App Development (iOS & Android)
7% Custom Web Application Development
3% API Development & Integration
6% Mobile App UI Design
AI Summary
“CodeHunterss specializes in transforming ideas into successful online businesses, offering expert custom web design, advanced web application development, and mobile app development services.”
WebXP
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WebXP.io is a comprehensive digital agency that focuses on web design, UI/UX, and custom software development. Their team collaborates with businesses to create visually striking websites, develop scalable web applications, and craft custom software solutions that address genuine challenges. Whether
Highlights
2-9
Employees
Services Provided+7 Services
3% Mobile App Development (iOS & Android)
6% E-Commerce Development
4% API Development & Integration
7% Custom Web Application Development
AI Summary
“WebXP.io is a digital agency specializing in web design, UI/UX, and custom software development, delivering visually compelling and scalable solutions to support business growth and performance.”
Nuelsville Technologies Limited
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Nuelsville Technologies is a leading technology firm based in Abuja, FCT, that focuses on website development, custom software, and business automation for small and medium-sized enterprises (SMEs). Our clientele spans various sectors, including retail, hospitality, energy, and media. We prioritize
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+8 Services
5% Mobile App Development (iOS & Android)
11% Custom Web Application Development
6% E-Commerce Development
3% API Development & Integration
AI Summary
“Nuelsville Technologies Limited is a Nigerian technology firm specializing in website development, custom software, and business automation, serving SMEs across diverse sectors with quality and timely solutions.”
Wajusoft
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A forward-thinking digital agency specializing in new technologies and concepts, dedicated to providing user-centric and commercially-driven solutions for both startups and established companies worldwide.
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+10 Services
7% Custom Web Application Development
5% Blockchain & Web3 Development
3% API Development & Integration
2% Legacy System Modernization
AI Summary
“Wajusoft is a global digital agency focused on innovative technologies and user-centric solutions, serving startups and established companies with commercially-driven services.”
Shivaay Technologies Pty Ltd
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We are a software development firm located in Melbourne, offering a full range of IT services as well as web and app development solutions. Our areas of expertise include:
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+5 Services
10% Custom Web Application Development
8% Mobile App Development (iOS & Android)
2% API Development & Integration
12% Product UX Strategy
AI Summary
“Shivaay Technologies Pty Ltd., based in Melbourne, specializes in comprehensive IT services including software, web, and app development, delivering tailored technology solutions to diverse clients.”
Digital One Box PVT LTD
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Digital One Box is an innovative IT, Software, and Blockchain Development firm at the cutting edge of technological progress. Dedicated to transforming industries with state-of-the-art solutions, we offer a wide range of services tailored to meet various business requirements. Our unique approach to
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+8 Services
6% Custom Web Application Development
4% API Development & Integration
10% Mobile App Development (iOS & Android)
20% AI Strategy & Roadmap Consulting
AI Summary
“Digital One Box offers advanced IT, blockchain, AI, and software development services including token, smart contract, NFT marketplace, mobile and web applications, driving innovation across industries.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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