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

CTRL+ALT Digital
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CTRL+ALT Digital is a highly recognized, comprehensive digital agency that has received numerous awards. As a certified Women-Owned Small Business (WOSB) and partners with Google and Microsoft Ads, we have also been honored as winners in Florida and nationally. Being a certified GSA contractor, we o
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Jacksonville, Florida, Us
Services Provided+1 Services
35% Custom Web Application Development
15% API Development & Integration
20% Search Engine Optimization (SEO)
25% Pay Per Click
AI Summary
“CTRL+ALT Digital is an award-winning, women-owned digital agency offering comprehensive services including web, app development, SEO, PPC, and design, emphasizing partnership and transparent communication.”
PushBinary
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PushBinary is a company focused on web and mobile development, dedicated to creating cutting-edge digital solutions. Our team is skilled in a range of technologies and helps you throughout the entire process, from the initial wireframing to the final production launch. We will support you at every s
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Custom Web Application Development
40% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“PushBinary specializes in web and mobile development, offering end-to-end digital solutions from wireframing to launch, transforming ideas into professional products.”
zsolnet
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ZSOLNET offers premium digital services designed to help businesses succeed in a constantly changing online environment. We deliver comprehensive solutions customized to your requirements, including reliable web hosting, domain management, engaging website development, artistic design, and strategic
Highlights
Dubai, Dubayy, Ae
Services Provided
20% API Development & Integration
15% Mobile App Development (iOS & Android)
15% QA & Software Testing
50% Search Engine Optimization (SEO)
AI Summary
“ZSOLNET provides tailored digital solutions including web hosting, domain management, website development, design, and digital marketing, combining technical expertise with creative strategy to support business growth.”
Codya
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Codya is a reliable collaborator in the realm of Artificial Intelligence and Machine Learning solutions. We focus on two key areas where AI makes a significant difference: Video Analytics for automated visual monitoring and AI Agents for streamlining intelligent processes. Our solutions are develope
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Krakow, Lesser Poland, Pl
Services Provided+5 Services
20% Custom Web Application Development
14% API Development & Integration
3% AI Strategy & Roadmap Consulting
3% Custom AI Chatbot Development
AI Summary
“Codya delivers tailored AI and machine learning solutions, specializing in video analytics and AI agents, integrating seamlessly into existing systems while ensuring compliance and ongoing optimization.”
TerraDynamic Ltd.
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TerraDynamic Ltd. is a software development firm that focuses on creating scalable web applications and personalized digital solutions for companies. We offer comprehensive development services utilizing a strong technology stack that includes React, TypeScript, and .NET. By leveraging our extensive
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Sofia, Sofia, Bg
Services Provided+3 Services
20% API Development & Integration
14% Custom Web Application Development
13% Cloud Infrastructure Setup (AWS / GCP / Azure)
3% Managed IT Services
AI Summary
“TerraDynamic Ltd. specializes in custom software development, API integration, and cloud solutions, delivering scalable, high-quality web applications tailored to diverse business needs across startups and corporations.”
Octal Digital
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Octal Digital is a comprehensive digital agency that provides a wide range of services to both small and large businesses aiming to establish and expand their presence in the growing digital marketplace. Our specialties in branding, web design and development, eCommerce solutions, mobile app and gam
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Dallas, Texas, Us
Services Provided
60% Mobile App Development (iOS & Android)
30% Custom Web Application Development
10% API Development & Integration
AI Summary
“Octal Digital is a versatile digital agency offering branding, web and eCommerce development, mobile app and game creation, and digital marketing to empower businesses across industries.”
The Brihaspati Infotech
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We are a full-service IT firm dedicated to assisting businesses of all sizes in enhancing their online presence. Our extensive range of IT services encompasses UI/UX design, web and mobile app development, headless solutions, and digital marketing. Founded in 2011, we have established ourselves as r
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Sahibzada Ajit Singh Nagar, Punjab, In
Services Provided
60% E-Commerce Development
30% Custom Web Application Development
10% API Development & Integration
AI Summary
“The Brihaspati Infotech is a full-service IT firm offering UI/UX design, app development, headless solutions, and digital marketing to empower businesses since 2011.”
Reestify
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Are you a B2B company in search of exceptional design, development, and marketing services? Look no further than Reestify! Our white-label offerings enable businesses to conserve valuable resources while fostering mutual growth. We provide a wide range of services, including UX/UI design, consulting
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+5 Services
25% API Development & Integration
9% UX Audit & Heuristic Evaluation
11% Wireframing & Prototyping
5% Product UX Strategy
AI Summary
“Reestify offers white-label design, development, and marketing services including UX/UI, consulting, prototyping, and branding to help B2B companies grow effectively and competitively.”
WantedForCode SL
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WantedForCode is a software engineering consultancy located in Fuengirola, Spain. We collaborate with technology firms across Europe and Latin America, functioning as embedded senior engineers rather than as distant vendors. Our approach involves being direct technical partners integrated into the p
Highlights
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
8% Mobile App Development (iOS & Android)
20% API Development & Integration
22% Custom Web Application Development
50% DevOps Engineering
AI Summary
“WantedForCode SL is a Spain-based software engineering consultancy delivering senior-level custom software, AI, and systems integration across Europe and Latin America with direct client collaboration.”
Reef Technologies
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Reef Technologies is a small firm dedicated to assisting early-stage startups transition from having barely functional or non-functional software to a robust version that supports business growth. Over the years, they have successfully transformed numerous projects in this way. The CEO, who has 16 y
Highlights
$1,000+
Min Project Size
$150+/hr
Avg Hourly Rate
10-49
Employees
Services Provided
30% Custom Web Application Development
50% Backend Development
20% API Development & Integration
AI Summary
“Reef Technologies specializes in rapidly advancing early-stage startups' software from minimal to robust. Led by an experienced CEO, they deliver highly efficient, production-ready solutions supporting scalable growth.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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