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

Smart Bytes Software
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We are Smart Bytes Software, a company specializing in custom .NET software solutions. We believe that our true success stems from creating exceptional software and providing consultancy services that assist our clients in reaching their business objectives. Our achievements are directly tied to the
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Burgas, Bg
Services Provided
50% Custom Web Application Development
30% API Development & Integration
20% Mobile App Development (iOS & Android)
AI Summary
“Smart Bytes Software specializes in custom .NET solutions and consultancy, delivering tailored software to help clients achieve their business goals and ensure their success.”
Gargar
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We assist companies in expanding and transitioning to digital through top-notch software solutions. Our team excels in creating streamlined, fast, and scalable web and mobile applications customized to your requirements. From conception to launch, we provide dependable, efficient, and forward-thinki
Highlights
2-9
Employees
Batumi, Ge
Services Provided
50% Custom Web Application Development
30% API Development & Integration
20% E-Commerce Development
AI Summary
“Gargar delivers expert software solutions facilitating digital transformation with tailored, scalable web and mobile applications, ensuring efficient, reliable products that promote sustainable business growth.”
Pepla
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Pepla is a software development firm that strives for excellence. Established in 2014, we offer software services to some of the largest companies in the industry. Built on principles of honesty, integrity, and quality coding, Pepla provides IT software solutions for businesses looking to expand dig
Highlights
$25,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Pretoria, Gauteng, Za
Services Provided
30% API Development & Integration
50% Custom Web Application Development
20% Mobile App Development (iOS & Android)
AI Summary
“Pepla, established in 2014, is a software development firm delivering quality IT solutions to major companies, emphasizing integrity, innovation, and tailored digital expansion services.”
Whitefox Cloud
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Whitefox.cloud specializes in providing advanced software solutions, emphasizing cloud services, software integrations, and tailored SaaS development. Our team of over 40 skilled developers possesses extensive industry knowledge across various sectors, including healthcare, financial technology, and
Highlights
$5,000+
Min Project Size
10-49
Employees
Bowen Hills, Queensland, Au
Services Provided
23% API Development & Integration
20% Custom Web Application Development
7% Mobile App Development (iOS & Android)
50% Cloud Consulting & SI
AI Summary
“Whitefox.cloud delivers customized cloud-based software solutions and integrations with expertise across healthcare, fintech, and government sectors, focusing on secure, innovative, and affordable digital transformation services.”
Cypher Core LLC
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Cypher Core serves as a white-label engineering partner for digital agencies in the US that require dependable technical support for API integrations, AI-driven backends, and tailored SaaS platforms. Under the leadership of Shah Rukh, a software engineer with over 14 years of practical experience in
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Austin, Texas, Us
Services Provided+1 Services
30% API Development & Integration
15% Custom Web Application Development
5% E-Commerce Development
30% Custom AI Chatbot Development
AI Summary
“Cypher Core LLC is a US-based white-label engineering partner specializing in API integrations, AI backends, and custom SaaS platforms, led by experienced software engineer Shah Rukh.”
A-Devgroup
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As a leading digital agency and studio, we excel in transforming concepts into captivating digital experiences. Our primary objective is to assist businesses in expanding by maximizing their digital potential. We provide guidance on utilizing contemporary tools to boost customer engagement, optimize
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Odesa, Odesa, Ua
Services Provided
25% API Development & Integration
50% Custom Web Application Development
25% Mobile App Development (iOS & Android)
AI Summary
“A-Devgroup is a digital agency specializing in business process automation, CRM deployment, and web and mobile development to enhance customer engagement, operational efficiency, and organizational growth.”
Hopeland Developers Yazılım ve Danışmanlık Tic. Ltd. Şti.
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Hopeland — Software Development Studio Established in March 2023, Hopeland is a software development studio that creates customized digital products for clients in construction, healthcare, and emerging technologies. We prioritize long-term collaborations and develop production-grade systems capabl
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
Services Provided
60% Custom Web Application Development
30% API Development & Integration
10% Mobile App Development (iOS & Android)
AI Summary
“Hopeland Developers Yazılım ve Danışmanlık is a software studio specializing in custom digital solutions for construction, healthcare, and defense sectors, combining senior expertise with AI-driven development for quality and speed.”
Syntora
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Syntora is an agency specializing in AI automation that creates tailored Python infrastructure for small and medium-sized businesses. We design automation systems, AI-driven document processing, and independent AI agents to remove manual and repetitive tasks. Our clientele includes sectors like comm
Highlights
$5,000+
Min Project Size
$150+/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
4% Workflow Automation (Zapier / Make / n8n)
2% IT Staff Augmentation
3% Other IT Consulting and SI
5% Custom AI Chatbot Development
AI Summary
“Syntora specializes in custom AI automation and Python infrastructure, delivering tailored solutions for complex workflows across various industries to enhance efficiency and ROI within months.”
ZAi-Fi
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We develop AI-driven chatbots and integrations that enhance customer interactions and improve business efficiency. Many companies use disconnected tools and manual processes, resulting in slow responses, lost leads, and operational challenges. Our team creates and integrates AI solutions into existi
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Chennai, Tamil Nadu, In
Services Provided+1 Services
30% API Development & Integration
20% Custom Web Application Development
30% Custom AI Chatbot Development
13% Generative AI
AI Summary
“ZAi-Fi develops and integrates AI-driven chatbots and automation solutions to streamline business workflows, enhance customer interactions, and improve operational efficiency for small to medium enterprises.”
Zygobit
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Zygobit is a technology-focused company committed to assisting businesses in creating impactful digital products and scalable solutions. With more than five years of industry expertise, we specialize in providing top-notch web development, mobile applications, and custom software solutions that cate
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Sahibzada Ajit Singh Nagar, Punjab, In
Services Provided+1 Services
33% API Development & Integration
14% AI Agent & Multi-Agent System Development
20% Generative AI
20% DevOps Engineering
AI Summary
“Zygobit delivers innovative digital products and scalable software solutions through agile development, enhancing efficiency and user experience for startups and enterprises alike.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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