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

The Pontos
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Pontos is a software company that addresses your corporate software requirements using innovative and highly efficient approaches, each supported by a dedicated team. Founded in Istanbul in 2015, it relocated its headquarters to the United Kingdom in 2020 to expand its presence in the global market.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided
20% Mobile App Development (iOS & Android)
30% API Development & Integration
50% Web App UI Design
AI Summary
“Established in 2015, Pontos is a UK-based software company delivering innovative, efficient corporate software solutions through dedicated teams, supporting global business needs.”
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Lunasoft LLC
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With more than a decade of experience in the airline sector, we focus on integrating the Amazon Air freighter program and enhancing the capabilities of Boeing 787 Dreamliners through electronic solutions. Our goal is to connect your airline with your vendors by offering customized software and solut
Highlights
$75,000+
Min Project Size
2-9
Employees
Services Provided
35% API Development & Integration
15% Legacy System Modernization
30% Cloud Consulting & SI
20% Other IT Consulting and SI
AI Summary
“Lunasoft LLC specializes in customized software and electronic solutions, enhancing airline operations through integration of Amazon Air freighters and Boeing 787 Dreamliners capabilities.”
Adamant Solutions Sh.p.k
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Understood — here is a text-only company overview for Adamant Solutions: **ADAMANT SOLUTIONS Company Overview** *IT Consulting & Custom Software Development* Tirana, Albania · Established in 2022 **01 — OVERVIEW** - Founded: 2022 - Location: Tirana, Albania - Legal Structure: Sh.p.k. (Albanian LLC
Highlights
$5,000+
Min Project Size
$150+/hr
Avg Hourly Rate
2-9
Employees
Services Provided
55% Custom Web Application Development
30% API Development & Integration
15% Mobile App Development (iOS & Android)
AI Summary
“Adamant Solutions, based in Tirana, Albania, offers IT consulting and custom software development, delivering scalable web and business applications with expertise in modern frontend, backend, and cloud technologies.”
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SILENT-CODE
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While many agencies focus on their own expansion, our main concern is the success of your project. As a small team of experienced freelance professionals, we offer the technical expertise of a large company along with the flexibility and commitment of a specialized partner. We don't merely carry out
Highlights
$25-49/hr
Avg Hourly Rate
Wiekowo, Pl
Services Provided
50% Custom Web Application Development
20% Mobile App Development (iOS & Android)
30% API Development & Integration
AI Summary
“SILENT-CODE is a small team of experienced freelancers delivering expert, flexible technical solutions focused on addressing business challenges and ensuring project success.”
Level-Worker
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Level-Worker is a Germany-based agency focused on process automation, particularly in AI-driven workflow solutions for small and medium enterprises in the DACH region. We create, implement, and support tailored automation systems utilizing n8n, Python, and AI technologies (such as Claude and GPT-4o)
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Bad Schwalbach, De
Services Provided+4 Services
10% Workflow Automation (Zapier / Make / n8n)
1% IT Staff Augmentation
4% Generative AI
8% Robotic Process Automation (RPA)
AI Summary
“Level-Worker is a German agency delivering tailored AI-powered process automation and workflow solutions, serving SMEs with GDPR-compliant systems across insurance, finance, and property sectors.”
Aikya Contactless Face Recognition | NSP
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Aikya is a sophisticated facial recognition technology powered by artificial intelligence, intended for high-security environments. It incorporates multiple authentication methods such as facial recognition, RFID, fingerprint scanning, and password entry, providing strong access control. Capable of
Highlights
50-249
Employees
Bengaluru, Karnataka, In
Services Provided+1 Services
30% API Development & Integration
25% Custom Web Application Development
15% Mobile App Development (iOS & Android)
20% QA & Software Testing
AI Summary
“Aikya offers AI-powered facial recognition with multi-factor authentication including RFID and fingerprints, delivering secure, fast access control and seamless integration for high-security environments.”
BPA.pro
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BPA.pro is a specialized agency that offers tailored business process automation solutions. Our goal is to eliminate inefficiencies in operations across various industries by utilizing existing technology and only adopting advanced technology when it's truly necessary. Our areas of expertise inclu
Highlights
2-9
Employees
Services Provided+3 Services
17% Robotic Process Automation (RPA)
4% Custom AI Chatbot Development
3% AI Strategy & Roadmap Consulting
7% Workflow Automation (Zapier / Make / n8n)
AI Summary
“BPA.pro specializes in tailored business process automation across diverse industries, leveraging RPA, API integration, and automation tools to optimize workflows, reduce inefficiencies, and support operational growth.”
Codehouse
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We develop flexible software solutions that align seamlessly with your business workflows.
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
30% API Development & Integration
50% Custom Web Application Development
20% Mobile App Development (iOS & Android)
AI Summary
“Codehouse specializes in creating adaptable software solutions that integrate smoothly with diverse business workflows, enhancing operational efficiency across various industries.”
BBX INFOTECH PRIVATE LIMITED
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BitBytXpress, a branch of BBX Infotech Pvt Ltd, is a technology leader focused on two primary areas: SEO and Digital Marketing, as well as Full Stack AI Development. **Digital Dominance: SEO and Digital Marketing** In the current digital landscape, establishing a solid online presence is crucial
Highlights
$1,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
50-249
Employees
Services Provided+4 Services
33% API Development & Integration
14% Machine Learning Model Development
13% Custom AI Chatbot Development
7% AI Strategy & Roadmap Consulting
AI Summary
“BBX Infotech Pvt Ltd, through BitBytXpress, specializes in SEO, digital marketing, and tailored Full Stack AI development, delivering innovative, client-centric technology solutions for business growth.”
Kffein
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Kffein is a comprehensive digital creative agency that prioritizes simplicity and clarity while captivating your audience with unexpected elements. When simplicity is executed effectively, brands build stronger connections with their audience and leverage successful strategies. It’s really that stra
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Montreal, Quebec, Ca
Services Provided
30% E-Commerce Development
20% API Development & Integration
50% Mobile App UI Design
AI Summary
“Kffein is a digital creative agency delivering tailored design, development, and maintenance services that emphasize simplicity and innovation to enhance brand engagement and market presence.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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