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

SquadifyPro
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**SquadifyPro:** Your go-to expert partner for Shopify, Shopify Apps, Shopify Plus, Shopify API, full-stack development & automation, N8N, Airtable, Zapier, and Python. Recognized as a **top-rated Plus Upwork agency** with a **100% job success score**, we are trusted globally for our outstanding web
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Yamuna Nagar, Haryana, In
Services Provided
60% E-Commerce Development
25% Custom Web Application Development
15% API Development & Integration
AI Summary
“SquadifyPro is a top-rated global agency specializing in Shopify development, automation, AI integration, and full-stack solutions, delivering scalable, future-proof digital services trusted across industries.”
HFT Crypto
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We offer top-tier development services for the fintech sector. You won't need to explain concepts like "order book," connectors, or "front run" to us; we're already familiar with them. Our expertise includes working with crypto APIs, decentralized exchanges (DEX), and the US stock market (including
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
25% API Development & Integration
20% Custom Web Application Development
5% Mobile App Development (iOS & Android)
15% Product UX Strategy
AI Summary
“HFT Crypto specializes in fintech development, offering expertise in high-frequency trading, crypto APIs, and multi-language trading bots across crypto, decentralized, and US stock markets.”
Gradient Insight Ltd
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Gradient Insight is a consultancy focused on AI and Data Science that assists small and medium-sized tech companies in harnessing the transformative potential of artificial intelligence. As experts in computer vision systems, Gradient Insight revolutionizes how businesses perceive and comprehend the
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Portsmouth, Gb
Services Provided+2 Services
17% Machine Learning Model Development
3% Generative AI
14% AI Strategy & Roadmap Consulting
13% API Development & Integration
AI Summary
“Gradient Insight Ltd. specializes in AI and computer vision consultancy, providing tailored end-to-end solutions that transform visual data into actionable insights across diverse industries for SMEs.”
CREASOFT ID
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We are Creative Software Technology, a tech company located in Indonesia. We provide software development services, including web application development, cloud infrastructure for businesses, and tailored software solutions to meet your specific requirements!
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Custom Web Application Development
20% Mobile App Development (iOS & Android)
20% API Development & Integration
10% QA & Software Testing
AI Summary
“CREASOFT ID is an Indonesian tech company specializing in software development, offering web applications, cloud infrastructure, and customized software solutions to meet diverse business needs.”
AKDev Group
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At AKDev Group, we develop impactful IT solutions designed to help businesses grow, optimize, and innovate. Since 2017, we've successfully completed over 60 projects in the US, EU, Canada, UAE, and elsewhere, collaborating with startups and small to medium-sized businesses to realize new ideas and e
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
Tbilisi, Tbilisi, Ge
Services Provided+3 Services
25% Custom Web Application Development
20% Mobile App Development (iOS & Android)
15% API Development & Integration
15% Backend Development
AI Summary
“AKDev Group delivers scalable, high-performance IT solutions since 2017, serving diverse industries globally with software development, optimization, and Agile support, ensuring lasting client partnerships and growth.”
binary stars GmbH
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We specialize in software development that supports rapid idea exploration and long-term product scalability. Our services encompass: Our technological solutions feature: Our expertise spans various industries and challenges, including: Additionally, we have specialties in:
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Langenfeld (Rheinland), North Rhine Westphalia, De
Services Provided
45% Custom Web Application Development
25% Mobile App Development (iOS & Android)
20% API Development & Integration
10% E-Commerce Development
AI Summary
“binary stars GmbH specializes in software development, enabling rapid idea exploration and scalable products across diverse industries with advanced technological solutions and comprehensive expertise.”
Vimix Technologies LLP
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Vimix Technologies LLP is a vibrant and forward-thinking software development firm focused on providing top-notch digital solutions. Boasting a team of more than 25 talented professionals, Vimix excels in various technologies such as Node.js, React.js, Python Django, DotNet, and Cloud Engineering. O
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+2 Services
25% API Development & Integration
5% E-Commerce Development
20% Mobile App Development (iOS & Android)
25% Product UX Strategy
AI Summary
“Vimix Technologies LLP is a dynamic software development firm delivering innovative web applications, cloud engineering, and tailored IT solutions with a skilled team to support diverse business needs.”
MABZONE TECHNOLOGIES PRIVATE LIMITED
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Welcome to MABZONE, a premier software development company committed to providing customized technology solutions for businesses around the globe. We specialize in mobile app development, web applications, custom software, CRM, ERP, data science, data analysis, embedded systems, and big data. Our te
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Mohali, Punjab, In
Services Provided+1 Services
20% Custom Web Application Development
30% Mobile App Development (iOS & Android)
20% API Development & Integration
10% E-Commerce Development
AI Summary
“MABZONE TECHNOLOGIES PRIVATE LIMITED delivers customized software solutions including mobile, web, blockchain, AI, IoT, and big data, leveraging industry expertise for diverse global clients.”
LintForge
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LintForge is a top-tier software development company focused on providing high-performance, scalable, and user-friendly digital solutions. Founded on the principles of technical excellence and a commitment to quality, the firm acts as a strategic ally for businesses seeking to overcome complex chall
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Peshawar, Khyber Pakhtunkhwa, Pk
Services Provided+1 Services
8% E-Commerce Development
5% Mobile App Development (iOS & Android)
17% API Development & Integration
20% Custom Web Application Development
AI Summary
“LintForge is a software development company specializing in scalable, secure, and user-friendly digital solutions, with expertise in WordPress, front-end, back-end development, and comprehensive support.”
MetroCapital IA Tech
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MetroCapital AI Tech focuses on automating business processes using cutting-edge technologies in Robotic Process Automation (RPA) and artificial intelligence. Our primary services include: - AI Software Development: We design personalized algorithms to address particular business issues, such as pro
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Providencia, Santiago Metropolitan Region, Cl
Services Provided+2 Services
10% AI Strategy & Roadmap Consulting
5% Custom AI Chatbot Development
13% Machine Learning Model Development
22% Robotic Process Automation (RPA)
AI Summary
“MetroCapital AI Tech delivers customized AI solutions including software development, robotic process automation, data analytics, and consulting to enhance operational efficiency and drive digital transformation.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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