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

Reactive Synapse
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At RxSynapse, we lead the way in AI-driven innovation within the Banking, Financial Services, and Insurance (BFSI) industry. Our state-of-the-art solutions enable organizations to refine their operations, improve decision-making, and stimulate growth through Automation, Integration, Migration, Strat
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+1 Services
15% AI Strategy & Roadmap Consulting
8% LLM Integration & Prompt Engineering
5% Custom AI Chatbot Development
22% Generative AI
AI Summary
“Reactive Synapse specializes in AI-driven solutions for the BFSI sector, enhancing operations, decision-making, and growth through automation, integration, migration, and strategic analytics.”
3ix Consulting
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3ix Consulting is a Microsoft Dynamics 365 Implementation Partner that focuses on sustainable, scalable, and flexible implementations and upgrades of Microsoft Dynamics 365 Business Applications. Our goal is to boost productivity, lower operational costs, and enhance customer satisfaction. We have e
Highlights
$25-49/hr
Avg Hourly Rate
50-249
Employees
Services Provided+1 Services
18% BI & Big Data Consulting & SI
17% CRM Consulting and SI
10% Cloud Consulting & SI
5% ERP Consulting and SI
AI Summary
“3ix Consulting specializes in Microsoft Dynamics 365 and Power Platform implementations, offering scalable solutions to enhance productivity, reduce costs, and support global businesses across diverse industries.”
Advapay
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Advapay offers the Macrobank Core Banking platform designed for fintech firms. Headquartered in Estonia and with a regional presence in the Netherlands, Spain, Poland, Serbia, and Canada, Advapay caters to financial service providers throughout the UK, EEA, Middle East, Africa, and Canada. The Macro
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Tallinn, Harju, Ee
Services Provided
40% Custom Web Application Development
40% API Development & Integration
20% SaaS Product Development
AI Summary
“Advapay delivers a flexible, customizable Macrobank Core Banking platform with comprehensive banking and payment features, serving fintechs globally via cloud or on-premise, supported by regulatory approvals.”
Kloudplugins
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We are passionate about connecting systems and streamlining business processes through our integration expertise and tools.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Lahore, Pk Punjab, Pk
Services Provided
50% API Development & Integration
33% Cloud Consulting & SI
17% Other IT Consulting and SI
AI Summary
“Kloudplugins specializes in integrating diverse systems and optimizing business processes through expert solutions and innovative tools, enhancing operational efficiency for organizations.”
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Goma-it e.U.
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Goma-IT ist eine Fachagentur für künstliche Intelligenz und Prozessautomatisierung mit Sitz in Vorarlberg. Unser Schwerpunkt liegt auf kleinen und mittleren Unternehmen im DACH-Raum, die wiederkehrende Aufgaben an intelligente Systeme delegieren möchten, ohne ein eigenes Technik-Team aufbauen zu müs
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Ausserbraz, Tyrol, At
Services Provided
8% IT Staff Augmentation
12% Other IT Consulting and SI
30% AI Agent & Multi-Agent System Development
50% API Development & Integration
AI Summary
“Goma-IT in Vorarlberg specializes in AI and process automation for SMEs in the DACH region, delivering practical, ready-to-use intelligent workflow solutions without requiring in-house tech teams.”
Business Insights
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Business Insights: Fueling Growth Through Data, AI, and Automation to Support Informed Decision-Making for Sustainable Organizational Success. Company Overview: At Business Insights, we help businesses excel in a world driven by Data and AI by providing customized Analytics, Automation, and AI-ena
Highlights
10-49
Employees
Services Provided+3 Services
50% API Development & Integration
15% Robotic Process Automation (RPA)
8% AI Agent & Multi-Agent System Development
13% Generative AI
AI Summary
“Business Insights delivers tailored analytics, AI, and automation solutions that empower organizations to enhance decision-making, optimize operations, and drive sustainable growth through data-driven innovation.”
Devs Colab
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Devs Colab offers MVP development services, agentic AI, and scalable solutions for startups, small to medium-sized businesses, and large enterprise teams throughout the United States.
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+3 Services
5% Other IT Consulting and SI
3% IT Staff Augmentation
8% Machine Learning Model Development
17% AI Agent & Multi-Agent System Development
AI Summary
“Devs Colab provides MVP development, agentic AI, and scalable technology solutions to startups, SMBs, and enterprises across the United States, supporting diverse business needs.”
TekNexuss
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TekNexuss is a web development firm dedicated to assisting businesses in creating reliable, scalable, and high-performing digital platforms. We collaborate with startups, agencies, and established enterprises to turn concepts into robust web solutions that promote growth and long-term success. Our s
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided
55% Custom Web Application Development
40% API Development & Integration
5% E-Commerce Development
AI Summary
“TekNexuss specializes in developing scalable, secure web platforms and SaaS solutions, partnering with businesses to deliver high-performing digital products aligned with long-term growth.”
N6 Solution (SMC) Pvt. Ltd.
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N6 Solution is a premier AI and software development firm located in Pakistan, dedicated to assisting businesses in creating intelligent and scalable digital solutions. With more than three years of experience in artificial intelligence and machine learning, our skilled team collaborates with both s
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
5% AI Strategy & Roadmap Consulting
5% LLM Integration & Prompt Engineering
5% Custom AI Chatbot Development
15% Machine Learning Model Development
AI Summary
“N6 Solution is a Pakistani AI and software development firm specializing in custom machine learning models, deep learning, and scalable digital solutions for startups and enterprises.”
QDev Technolab Private Limited
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We are a dedicated agency specializing in Java, Spring Boot, and Angular development, boasting over 10 years of experience in creating high-quality solutions for startups, enterprises, and product companies. Our team comprises: -> Senior Java Backend Engineers -> Full-Stack Java and Angular Develope
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided
65% Custom Web Application Development
35% API Development & Integration
AI Summary
“QDev Technolab Private Limited specializes in Java, Spring Boot, and Angular development, delivering high-quality solutions with experienced engineers for startups, enterprises, and product companies.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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