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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8,490 Companies

List of the Best API Development & Integration Agencies

OpenSoftAI
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OpenSoftAI is an innovative provider of software and artificial intelligence solutions focused on assisting businesses in their digital transformation. We excel in AI-driven applications, machine learning models, automation systems, and tailored software development for startups, small and medium-si
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Jaipur, Rajasthan, In
Services Provided+2 Services
20% API Development & Integration
30% Custom Web Application Development
18% Machine Learning Model Development
10% Generative AI
AI Summary
“OpenSoftAI delivers AI-driven software and automation solutions, supporting businesses of all sizes with tailored development, integration, and digital transformation services for sustainable growth.”
Kreitech
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We collaborate with fintech scaleups and established fintech teams in the US to assist in developing and enhancing software systems within regulated, reliable environments. Our services encompass two main areas: embedded staffing, where experienced engineers join existing teams, and end-to-end deliv
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Montevideo, Montevideo, Uy
Services Provided+8 Services
17% Backend Development
12% API Development & Integration
5% Custom Web Application Development
33% DevOps Engineering
AI Summary
“Kreitech partners with US fintech firms to provide embedded staffing and full project delivery across payments, lending, RegTech, fraud, and open banking, ensuring reliable, compliant software solutions.”
Krinvi Technologies Pvt. Ltd.
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Our goal for IT consulting services is to offer businesses cutting-edge and innovative technology solutions that empower them to reach their objectives and maintain a competitive edge. We recognize the fast pace of technological advancements and strive to assist our clients in staying updated with t
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Noida, Uttar Pradesh, In
Services Provided+1 Services
15% API Development & Integration
20% Custom Web Application Development
10% Mobile App Development (iOS & Android)
5% E-Commerce Development
AI Summary
“Krinvi Technologies Pvt. Ltd. delivers tailored IT consulting services, offering innovative, client-focused technology solutions to help businesses achieve goals and stay competitive amidst rapid tech advancements.”
Cognito Strategy
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We assist enterprise and mid-market teams in transitioning from an interest in AI to implementing production systems that enhance forecasting, workflows, reporting, and decision-making. We focus on clear objectives, effective execution, and avoid unnecessary showmanship.
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Dubai, Dubayy, Ae
Services Provided+1 Services
20% Custom Web Application Development
10% Mobile App Development (iOS & Android)
15% API Development & Integration
5% E-Commerce Development
AI Summary
“Cognito Strategy partners with enterprises and mid-market firms to implement practical AI solutions, enhancing forecasting, workflows, reporting, and decision-making through focused execution and clear objectives.”
Gaurav Parmar
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Your Current Challenge: The process of launching and validating new software ideas is hindered by slow and expensive traditional development cycles. Market opportunities are fleeting, funding relies on gaining traction, and internal resources are stretched thin. You require functional prototypes and
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
Ahmedabad, Gujarat, In
Services Provided+1 Services
20% API Development & Integration
20% Cloud Consulting & SI
20% Software Development Services
20% DevOps Engineering
AI Summary
“Gaurav Parmar excels in custom software development, notably API Development and custom web applications, leveraging rapid iterations and AI to deliver high-quality prototypes and MVPs efficiently.”
Nidavellier S.R.O
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Located in the Czech Republic, we draw on talent from around the globe to provide a premier advantage for your project. Whether it's creating viral sensations or developing sturdy enterprise solutions, our skills in full-stack web development, Swift, Java, and Unity guarantee that your vision is cra
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Praha 5, Cz
Services Provided+1 Services
40% Custom Web Application Development
25% Mobile App Development (iOS & Android)
15% API Development & Integration
10% E-Commerce Development
AI Summary
“Nidavellier S.R.O., based in the Czech Republic, offers expert full-stack web development alongside Swift, Java, and Unity services, delivering high-quality, innovative digital solutions globally.”
Alterity Technologies
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At Alterity Technologies, our goal is to combine the personalized service offered by local IT providers with the strength of a nationwide network. We hold the belief that this concept is more straightforward than it appears. Our offices provide exceptional IT services that clients appreciate, delive
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Kampala, Ug
Services Provided+10 Services
12% Other IT Consulting and SI
4% CRM Consulting and SI
4% Cloud Consulting & SI
8% Graphic Design
AI Summary
“Alterity Technologies delivers personalized, high-quality IT services through a skilled local team, supported by a robust nationwide network, ensuring exceptional client satisfaction.”
Stagebit
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At Stagebit, we don't merely develop digital solutions; we create outcomes that enhance your business growth. With over ten years of experience and a team of more than 15 certified professionals, we focus on high-performance eCommerce development and custom software engineering that yields tangible
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Surat, Gujarat, In
Services Provided+1 Services
25% Custom Web Application Development
15% API Development & Integration
10% Mobile App Development (iOS & Android)
40% E-Commerce Development
AI Summary
“Stagebit specializes in high-performance e-commerce, custom software, mobile app development, and DevOps, delivering scalable solutions that drive business growth across diverse global industries.”
CRM Support Online
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Professional services for CRM setup, automation, migration, and support. CRM Support Online assists businesses in enhancing performance and simplifying workflows. We offer dependable CRM solutions to support growing companies, including setup, migration, automation, and integrations. CRM Support Onl
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
3% AI Strategy & Roadmap Consulting
3% Custom AI Chatbot Development
27% CRM Consulting and SI
20% API Development & Integration
AI Summary
“CRM Support Online delivers professional CRM setup, migration, automation, and integration services globally, enhancing business performance and streamlining workflows with efficient and reliable solutions.”
TechnologyAlly
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Technology Ally is an offshore software outsourcing firm that specializes in developing and maintaining web and mobile software solutions for small and medium enterprises. We provide affordable software solutions to help our clients remain competitive in the global marketplace. Our steadfast commitm
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Overland Park, Kansas, Us
Services Provided+2 Services
8% API Development & Integration
20% Custom Web Application Development
18% Mobile App Development (iOS & Android)
2% E-Commerce Development
AI Summary
“Technology Ally is an offshore software outsourcing firm delivering affordable, high-quality web and mobile solutions to small and medium enterprises, ensuring efficiency and excellent customer service worldwide.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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