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

TruGen AI
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TruGen AI is a business-oriented AI platform that creates highly realistic AI agents featuring lifelike appearances, voices, and visual capabilities. Our AI teammates participate in live video calls, carry out workflows, collaborate with teams, and accumulate knowledge that improves over time. Wheth
Highlights
10-49
Employees
South Plainfield, New Jersey, Us
Services Provided+2 Services
35% AI Agent & Multi-Agent System Development
10% Custom AI Chatbot Development
5% AI Strategy & Roadmap Consulting
25% API Development & Integration
AI Summary
“TruGen AI develops realistic AI agents that engage in live video calls, automate workflows, collaborate with teams, and enhance processes across sales, recruitment, onboarding, and coding.”
SHFT
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We relieve you of the development burden through our scalable and dedicated in-house developers. Consider us your strategic partner in product development. We cater to passionate startups and ambitious scale-ups, supporting them with comprehensive design, a well-defined MVP scope, flawless developme
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Istanbul, Istanbul, Tr
Services Provided
50% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
AI Summary
“SHFT partners with startups and scale-ups by providing dedicated in-house developers who manage the full product development lifecycle, from design and MVP definition to launch.”
whizpalstech
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Whizpalstech is a group of technology enthusiasts committed to providing innovative solutions that enhance business success. We offer diverse services such as website development, mobile app development, and OTT/TV streaming app creation. Our proficiency covers popular web technologies, including La
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Bhavnagar, Gujarat, In
Services Provided
50% Custom Web Application Development
20% API Development & Integration
30% Mobile App Development (iOS & Android)
AI Summary
“Whizpalstech specializes in developing customized web, mobile, and OTT streaming solutions using modern technologies, delivering high-quality, user-centric digital experiences across diverse industries.”
QalbIT Infotech Pvt Ltd
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Are you in search of a team that consistently provides top-notch web and mobile solutions on schedule? With over 10,000 hours of work completed and more than 100 five-star reviews on Upwork, we are prepared to bring your ideas to life. We are a Top Rated Plus Agency with a perfect Job Success Score
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Ahmedabad, Gujarat, In
Services Provided
30% Custom Web Application Development
15% API Development & Integration
5% E-Commerce Development
50% Web App UI Design
AI Summary
“QalbIT Infotech Pvt Ltd specializes in delivering timely, high-quality web and mobile solutions globally, leveraging technologies like Node.js, Laravel, React, WordPress, and Flutter since 2018.”
Pecode
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Pecode is a software development firm with over 8 years of experience and a solid track record. With a team of 160 technical experts located globally, we seamlessly integrate into projects to assist startups at any phase and work alongside small to medium-sized businesses. We also provide white-labe
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Lviv, Lviv, Ua
Services Provided
30% Custom Web Application Development
15% API Development & Integration
5% QA & Software Testing
50% Other Design
AI Summary
“Pecode delivers custom web development, API integration, application testing, and UX/UI design, providing scalable, secure, and user-centric software solutions across diverse industries.”
RK Software Systems
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RK Software Systems is a top provider of innovative software solutions, focusing on .NET web and desktop development and updating legacy systems to contemporary technology frameworks. Our team of dedicated professionals offers extensive services across the complete software development lifecycle. At
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Warszawa, Masovian, Pl
Services Provided
50% Custom Web Application Development
20% API Development & Integration
30% Legacy System Modernization
AI Summary
“RK Software Systems specializes in innovative .NET web and desktop software development, modernizing legacy systems and delivering comprehensive solutions throughout the software lifecycle to support business success.”
Software Planet Group
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Software Planet Group (SPG) is a comprehensive software solutions provider with nearly 20 years of experience in customizing and creating applications for various businesses, from start-ups to multinational corporations, across diverse industries in the USA and Europe. SPG offers an end-to-end softw
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Cherkasy, Ua
Services Provided+2 Services
30% Custom Web Application Development
20% Mobile App Development (iOS & Android)
20% API Development & Integration
10% SaaS Product Development
AI Summary
“Software Planet Group delivers comprehensive, end-to-end software development solutions, leveraging nearly 20 years of expertise to serve diverse industries across the USA and Europe.”
Eura7 Software House
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We are a software company dedicated to delivering services efficiently. Our main focus is on developing custom web systems and landing pages for loyalty programs, lotteries, and online contests. We excel in integrating our software with a variety of systems, including marketing automation, payment s
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Krakow, Lesser Poland, Pl
Services Provided+1 Services
25% Custom Web Application Development
20% API Development & Integration
5% Mobile App Development (iOS & Android)
30% Product UX Strategy
AI Summary
“Eura7 Software House specializes in custom web systems and integrations for marketing, payments, and management platforms, offering reliable, efficient software solutions with a seven-year warranty.”
Pendoah
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Pendoah is a Houston-based software company that assists businesses across North America in transforming product strategies into fully operational systems with measurable results. We partner with leaders in sectors such as healthcare, finance, energy, public services, and SaaS who require more than
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Houston, Texas, Us
Services Provided+10 Services
15% QA & Software Testing
20% API Development & Integration
15% Custom Web Application Development
3% Generative AI
AI Summary
“Pendoah is a Houston-based software firm specializing in AI strategy, custom product development, and operational systems that deliver compliant, scalable, and measurable outcomes for various industries.”
Vstorm (Leading AI Agent Company)
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Vstorm assists mid-market challengers in their transition to Agentic AI, enabling them to outperform competitors and streamline business processes with the established TriStorm Agentic AI delivery framework. The company provides a reliable return on investment thanks to the practical implementation
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Wroclaw, Lower Silesian, Pl
Services Provided+4 Services
10% AI Strategy & Roadmap Consulting
15% LLM Integration & Prompt Engineering
13% Custom AI Chatbot Development
7% Machine Learning Model Development
AI Summary
“Vstorm empowers mid-market businesses to excel by deploying Agentic AI solutions through its TriStorm framework, leveraging expert teams to enhance efficiency and competitive advantage.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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