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

Sea Custom Software Development
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Sea offers custom software development services through a team of industry-leading shipping experts. Originally known as Setapp, Sea acquired the Polish technology company in 2022, with Setapp rebranding to Sea in 2023. With over seven years of experience creating tailored software solutions for glo
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Poznan, Greater Poland, Pl
Services Provided+1 Services
30% Custom Web Application Development
25% Backend Development
20% Frontend Development
15% API Development & Integration
AI Summary
“Sea Custom Software Development delivers tailored software solutions for the maritime sector, leveraging expertise in full-stack development, cloud computing, API integration, and data analytics to address industry challenges.”
Pixelflames Technologies Pvt Ltd
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Pixelflames is an agency that focuses on web and mobile app design and development, offering top-notch web and app designs, SEO, digital marketing, CMS consulting, and e-commerce solutions. With over a decade of experience, we excel at turning concepts into effective digital solutions and have compl
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Kozhikode, Kerala, In
Services Provided+1 Services
30% Mobile App Development (iOS & Android)
25% E-Commerce Development
20% Custom Web Application Development
15% API Development & Integration
AI Summary
“Pixelflames Technologies Pvt Ltd specializes in comprehensive digital solutions including web and mobile app development, CMS consulting, e-commerce, SEO, and digital marketing with over a decade of expertise.”
4DEVCODING
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4DEVCODING is a software development company based in Portugal, specializing in creating innovative solutions for various industries. Our team consists of skilled and experienced professionals dedicated to delivering tailored solutions that cater to the specific needs of each client. By adopting a c
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Vila Verde, North, Pt
Services Provided+2 Services
15% Custom Web Application Development
13% Mobile App Development (iOS & Android)
5% E-Commerce Development
5% Legacy System Modernization
AI Summary
“4DEVCODING is a Portugal-based software company offering tailored web and mobile development, cloud solutions, process automation, and team outsourcing to help businesses innovate and grow.”
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Virender Chauhan
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We focus on developing scalable and high-performing web applications with contemporary technologies such as MERN and Next.js. Our solid expertise in AI and ML enables us to provide intelligent, future-oriented solutions, including SaaS platforms, custom dashboards, and automation tools. Whether you'
Highlights
< $25/hr
Avg Hourly Rate
Services Provided
60% Custom Web Application Development
25% API Development & Integration
15% E-Commerce Development
AI Summary
“Virender Chauhan specializes in scalable web applications using MERN and Next.js, integrating AI and ML for intelligent SaaS platforms, custom dashboards, and automation solutions tailored to startups and growing businesses.”
Naman Technolab
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Naman Technolab, located in Ghaziabad, Uttar Pradesh, India, is a leading travel software firm that specializes in developing travel portals and integrating APIs for flights, hotels, and buses. Our all-encompassing software solutions address the varied needs of the travel industry, promoting smooth
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Services Provided
30% Custom Web Application Development
20% API Development & Integration
50% Managed IT Services
AI Summary
“Naman Technolab specializes in innovative travel software, delivering customized solutions and API integrations to enhance efficiency for travel agencies, tour operators, and online platforms.”
White Web Worx
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A technology firm that prioritizes the return on investment for our clients and partners by utilizing cutting-edge techniques and automation, while emphasizing the expertise of our dedicated team committed to ensuring project and customer success.
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Services Provided
50% Search Engine Optimization (SEO)
30% Custom Web Application Development
20% API Development & Integration
AI Summary
“White Web Worx is a technology firm leveraging cutting-edge techniques and automation to maximize client ROI, backed by a dedicated team focused on project and customer success.”
Smartfrog CBI
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Smartfrog CBI is an innovative software development company that focuses on creating customized web and mobile applications designed to meet the specific needs of businesses across various sectors. Our goal is to equip companies with cutting-edge, scalable, and user-friendly digital solutions that p
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Bishkek, Chuy, Kg
Services Provided
18% API Development & Integration
10% E-Commerce Development
22% Mobile App Development (iOS & Android)
50% Product UX Strategy
AI Summary
“Smartfrog CBI specializes in developing customized web and mobile applications, delivering scalable, user-friendly digital solutions tailored to diverse business needs with collaborative client focus.”
Sarvico Infotech
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Sarvico Infotech is a reputable website development agency located in Noida and Delhi NCR, providing modern, responsive, and SEO-optimized websites for businesses of various sizes. We specialize in creating customized websites, corporate sites, eCommerce platforms, landing pages, and CMS-driven webs
Highlights
2-9
Employees
Services Provided
20% API Development & Integration
30% E-Commerce Development
50% Product UX Strategy
AI Summary
“Sarvico Infotech is a Noida-based web development agency specializing in customized, SEO-optimized websites, eCommerce platforms, and CMS-driven sites focused on user experience and digital growth.”
GrowthLenz
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Growthlenz is a reliable ally in facilitating digital transformation and empowering your workforce. Our platform, tailored for asset-heavy organizations, assists businesses in optimizing their operations, enhancing field service effectiveness, and developing a workforce ready for the future. Using o
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Services Provided
30% Custom Web Application Development
20% API Development & Integration
50% Operational Process Consulting
AI Summary
“GrowthLenz offers digital transformation solutions for asset-intensive organizations, enhancing asset management, workforce efficiency, and compliance through integrated platform tools and IoT integrations.”
Interactive Design
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With over 20 years of expertise, we aim to develop solutions that are not only effective but also built to last. We take great pride in our craftsmanship and are deeply committed to our projects. You won't encounter half-hearted solutions with us; every aspect is meticulously considered and planned
Highlights
$50-99/hr
Avg Hourly Rate
2-9
Employees
Ioannina, Gr
Services Provided
30% Custom Web Application Development
15% API Development & Integration
5% E-Commerce Development
50% Web App UI Design
AI Summary
“Interactive Design delivers meticulously planned, long-lasting solutions with over 20 years of expertise, emphasizing quality craftsmanship and comprehensive project commitment across various domains.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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