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

Lumico Digital
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We are a group of software, electrical, and mechanical engineers committed to assisting our clients in creating tailored digital platforms, along with offering our knowledge in hardware and systems. Our areas of expertise encompass Digital Transformation, IoT product development, embedded systems, a
Highlights
$25,000+
Min Project Size
$150+/hr
Avg Hourly Rate
10-49
Employees
Fareham, Gb
Services Provided+1 Services
14% Custom Web Application Development
3% Mobile App Development (iOS & Android)
17% API Development & Integration
33% Robotic Process Automation (RPA)
AI Summary
“Lumico Digital specializes in creating custom digital platforms and integrated IoT, embedded systems, and industrial automation solutions, combining software, electrical, and mechanical engineering expertise.”
Komit Tech
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komit.tech: Ihre deutschsprachige Technologieagentur im Herzen des Balkans. Mit unserem Standort in Prishtina, Kosovo, kombinieren wir deutsche Genauigkeit mit innovativer Kreativität. Unser Schwerpunkt liegt auf maßgeschneiderten digitalen Lösungen für den DACH-Raum. Zu unseren Kernkompetenzen gehö
Highlights
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Custom Web Application Development
35% Mobile App Development (iOS & Android)
15% API Development & Integration
AI Summary
“komit.tech is a German-speaking Balkan-based technology agency specializing in customized digital solutions for the DACH region, offering web and software development, IT services, SEO, and outstaffing with agile, cost-efficient expertise.”
Gintic Tech
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Expert in developing web and mobile applications, enterprise integration (APIs), and cloud-based solutions. Knowledgeable in design and architecture, as well as both frontend and backend development, data storage, deployment, and maintenance. Experienced in creating applications for social media, e-
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Medellin, Antioquia, Co
Services Provided
15% API Development & Integration
20% Custom Web Application Development
15% Mobile App Development (iOS & Android)
50% Cloud Consulting & SI
AI Summary
“Gintic Tech specializes in developing web and mobile applications, enterprise API integrations, and cloud-based solutions across diverse industries, excelling in design, development, and data analytics.”
Stmpal
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Founded out of a basic frustration, Sympal emerged from the dissatisfaction that many engineering agencies prioritized the size of their retainers over the quality of their outcomes. Launched in 2019 with a team of three engineers, we established a core principle: only take on projects where success
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Mississauga, Ontario, Ca
Services Provided+6 Services
25% Custom Web Application Development
20% API Development & Integration
5% Legacy System Modernization
10% AI Strategy & Roadmap Consulting
AI Summary
“Founded in 2019, Stmpal is an engineering agency specializing in full-stack development, AI, data, and IoT, focusing on measurable project success from the outset.”
Zanith Web Design
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Everything You Require, All in One Location We provide a comprehensive solution customized to your requirements, taking you from idea to execution. Whether it's design, development, strategy, or support, we consolidate everything in one place, allowing you to concentrate on your growth while we take
Highlights
50-249
Employees
Services Provided
20% API Development & Integration
18% E-Commerce Development
12% QA & Software Testing
50% CRM Consulting and SI
AI Summary
“Zanith Web Design offers integrated services from design and development to strategy and support, delivering tailored solutions that enable clients to focus on growth while managing all project details.”
IISL
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Anyone can achieve RESULTS, but only a select few can provide SATISFACTION. Indian Innovating Software Limited Services (IISL), an ISO 9001:2013 certified organization, is a well-known IT Software Solutions provider located in Surat, India. Founded in 2016, the company was established to focus on So
Highlights
$10,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Surat, Gujarat, In
Services Provided
35% Mobile App Development (iOS & Android)
20% E-Commerce Development
30% Custom Web Application Development
15% API Development & Integration
AI Summary
“IISL, an ISO-certified Indian IT company, specializes in web and mobile app development, offering offshore software, cloud services, and e-commerce solutions with a client-focused approach.”
Radical I/O
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Radical I/O is a development studio and consultancy specializing in mobile and web applications, with a strong focus on API development, cloud integrations, and scalable solutions. Established in 2014 and based in Vancouver, BC, the company is spearheaded by Ian and Briana Sim. We recognize the requ
Highlights
$25,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
Vancouver, British Columbia, Ca
Services Provided+4 Services
20% API Development & Integration
18% Mobile App Development (iOS & Android)
13% Custom Web Application Development
7% IT Staff Augmentation
AI Summary
“Radical I/O, a Vancouver-based studio founded in 2014, specializes in mobile and web app development, API design, and scalable cloud integrations serving diverse sectors like banking and healthcare.”
High Appler LLC
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HighAppler is a firm that focuses on software engineering services and provides tailored software solutions. We offer technology expertise and software services, covering everything from the design and development of custom applications to the maintenance of current ones.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% API Development & Integration
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
10% E-Commerce Development
AI Summary
“High Appler LLC specializes in custom software engineering services, delivering tailored application design, development, and maintenance to meet diverse technology needs effectively.”
Client Centrik Solutions
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Client Centrik Solutions is a contemporary IT software and digital solutions firm dedicated to assisting businesses in enhancing, optimizing, and expanding their digital presence through tailored, technology-driven solutions. Established in January 2025, our company has a distinct mission: to produc
Highlights
2-9
Employees
Services Provided
20% API Development & Integration
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
10% E-Commerce Development
AI Summary
“Client Centrik Solutions offers customized IT software and digital services, including web and app development, ensuring quality, scalability, and client-focused solutions for business growth.”
Phanoon Software Solutions
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Phanoon is a vibrant IT firm focused on providing tailored software development solutions that help businesses innovate and expand. We create scalable, secure, and high-performance software that meets the specific requirements of startups, small and medium-sized enterprises (SMEs), and large corpora
Highlights
$1,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided
20% API Development & Integration
40% Custom Web Application Development
30% Mobile App Development (iOS & Android)
10% Legacy System Modernization
AI Summary
“Phanoon Software Solutions delivers tailored, scalable software and IT consulting services across startups to large enterprises, enabling digital transformation with secure, high-performance applications.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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