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

UpScale X
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UpScaleX is a German agency that utilizes AI automation to assist companies in removing manual, repetitive tasks with smart workflow automation. Established by Yves Lubaki, we focus on creating n8n workflows, AI agents, system integrations (including CRM and ERP), and tailored API connections. Our c
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+4 Services
15% AI Agent & Multi-Agent System Development
5% AI Strategy & Roadmap Consulting
5% Custom AI Chatbot Development
5% Generative AI
AI Summary
“UpScaleX is a German AI automation agency specializing in smart workflow automation, system integration, and custom API solutions that save clients significant time while ensuring GDPR compliance and scalability.”
Intelexity
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Our company provides an extensive array of software development services, including the evaluation and enhancement of current business processes, the design and planning of information systems for maximum efficiency, the creation of documentation, the coordination of implementation efforts, and proj
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Batumi, Ge
Services Provided
38% Custom Web Application Development
12% API Development & Integration
50% DevOps Engineering
AI Summary
“Intelexity delivers comprehensive software development services, optimizing business processes through tailored solutions, system design, project management, and full lifecycle support ensuring efficiency, security, and reliability.”
Cesbit
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We are the creators of open-source solutions, with ThingsDB as our premier product—an adaptable data management tool designed for startups, delivering exceptional performance, flexibility, and affordability.
Highlights
$50-99/hr
Avg Hourly Rate
2-9
Employees
Weert, Nl
Services Provided
38% Custom Web Application Development
12% API Development & Integration
50% IT Compliance & Governance
AI Summary
“Cesbit develops open-source solutions, specializing in ThingsDB, a versatile and cost-effective data management tool tailored for startups, emphasizing performance and flexibility.”
Villiers Vision Works (Pty) Ltd
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Villiers Vision Works is a consultancy focused on custom software development, particularly in embedded applications, backend systems, and integrations tailored for agencies and growing companies. We serve as an unobtrusive technical partner for digital agencies and a reliable development collaborat
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
30% Custom Web Application Development
18% API Development & Integration
2% Legacy System Modernization
5% AI Strategy & Roadmap Consulting
AI Summary
“Villiers Vision Works specializes in custom, future-ready software solutions including embedded applications, secure APIs, and integrations, serving digital agencies and SMEs with tailored, maintainable, and scalable systems.”
Aubrant Digital
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Crafting Your Digital Success: Amid continuous digital changes, we empower our clients to thrive by offering the technological tools necessary for a digital business environment. Our diverse range of customized digital services includes bespoke software development, cloud infrastructure management,
Highlights
50-249
Employees
Hopkins, Minnesota, Us
Services Provided+2 Services
10% API Development & Integration
18% Custom Web Application Development
7% Mobile App Development (iOS & Android)
5% Legacy System Modernization
AI Summary
“Aubrant Digital delivers comprehensive global digital solutions including custom software development, cloud infrastructure, and advanced AI technologies, enabling clients to excel in evolving digital landscapes.”
Axelerant
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Axelerant enables global enterprises and forward-thinking digital-first brands to create transformative digital experiences, modernize their systems, and harness the full potential of AI-driven innovation. Our multidisciplinary teams combine digital engineering, experience design, and data intellige
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Gurugram, Haryana, In
Services Provided+3 Services
13% API Development & Integration
30% Custom Web Application Development
8% E-Commerce Development
17% Custom AI Chatbot Development
AI Summary
“Axelerant partners with global enterprises to deliver AI-driven digital experiences, modernize systems, and provide agile engineering, design, and data services for scalable, innovative solutions.”
Convergence
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Convergence specializes in creating, designing, and implementing business-grade software ecosystems of various kinds. As a proud Canadian firm, we operate two development offices—Convergence HQ and Convergence AI Labs—in the vibrant financial district of Downtown Vancouver. Our expertise spans artif
Highlights
$50,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Vancouver, British Columbia, Ca
Services Provided+6 Services
15% Backend Development
15% API Development & Integration
8% Frontend Development
13% Custom Web Application Development
AI Summary
“Convergence is a Canadian technology partner specializing in business-grade software, AI, blockchain, cloud infrastructure, and digital solutions, serving startups to enterprises across multiple sectors.”
Chainweb Group
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Chainweb Group SIA is a software engineering firm that prioritizes AI in its approach to developing scalable digital solutions and intelligent automation. We create and engineer production-ready platforms that fuse web and mobile technology with AI integration, system orchestration, and cloud infras
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Torino, Piedmont, It
Services Provided+9 Services
18% Custom Web Application Development
15% Mobile App Development (iOS & Android)
15% API Development & Integration
3% QA & Software Testing
AI Summary
“Chainweb Group SIA is a software engineering firm specializing in AI-driven scalable digital solutions, including web and mobile platforms, system integration, cloud architecture, and automation across fintech and SaaS sectors.”
Kolte Technologies
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- Proficient in MVC, C#, SQL Server, .NET Framework, Telerik Controls, Kendo UI, JavaScript, jQuery, CSS, HTML, and integrations with social network APIs, including UPS shipping, FedEx, DFL, and DPD. - Expertise in front-end technologies like AngularJS, Angular versions 2, 4, 7, 10+, and TypeScript.
Highlights
$10,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Surat, Gujarat, In
Services Provided+2 Services
25% Custom Web Application Development
5% Mobile App Development (iOS & Android)
20% E-Commerce Development
20% API Development & Integration
AI Summary
“Kolte Technologies offers comprehensive software development services specializing in .NET, front-end frameworks, API integration, e-commerce solutions, and Agile methodologies with flexible engagement models.”
EazyCode
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We are EazyCode Agency, where innovation converges with web development expertise. With over ten years of experience, we started with conventional web development technologies like PHP, HTML, and JavaScript. However, about six years ago, we made a significant shift towards no-code development, adopt
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Chisinau, Chisinau, Md
Services Provided+2 Services
13% API Development & Integration
12% Mobile App Development (iOS & Android)
25% Custom Web Application Development
25% Web App UI Design
AI Summary
“EazyCode Agency combines over a decade of web development expertise with no-code innovation, specializing in Bubble platform solutions, templates, plugins, and emerging technologies across Europe.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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