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

CSSHouse Consulting
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CSSHouse is a results-oriented digital marketing and web development agency. We create top-notch designs and convert them into stunning, high-quality websites that are meticulously coded and adhere to W3C standards. Our passion lies in exceptional designs, usability, innovative technologies, and est
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Sahibzada Ajit Singh Nagar, Punjab, In
Services Provided+13 Services
5% Custom Web Application Development
5% Backend Development
4% Frontend Development
4% API Development & Integration
AI Summary
“CSSHouse Consulting specializes in digital marketing, web development, UI/UX design, and backend solutions, delivering high-quality, standards-compliant websites and fostering lasting client partnerships.”
Web Experience
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WebExperience es una agencia digital que se especializa en proporcionar soluciones tecnológicas que integran diseño, funcionalidad y eficiencia. Transformamos ideas en herramientas concretas que ayudan a impulsar negocios en el ámbito digital, siempre con un enfoque estratégico y centrado en las nec
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+5 Services
17% Custom Web Application Development
8% API Development & Integration
8% Backend Development
13% UX Research & Usability Testing
AI Summary
“WebExperience is a digital agency delivering tailored web design, development, automation, and AI solutions, integrating creativity and technology to enhance business growth and operational efficiency.”
BINARY FUSION SRL
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We assist you in swiftly advancing innovative concepts and achieving tangible business benefits by maximizing our production-ready custom software development and UI/UX offerings.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided+6 Services
8% API Development & Integration
13% Mobile App Development (iOS & Android)
12% Custom Web Application Development
5% UX Audit & Heuristic Evaluation
AI Summary
“BINARY FUSION SRL specializes in custom software development and UI/UX design, enabling rapid innovation and delivering practical business solutions across diverse industries.”
aarsis
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Aarsis – Your Reliable Partner for Custom Software Development Aarsis is a full-service software development firm providing innovative solutions to businesses in Sydney, Australia, and around the globe. With a local office in Sydney and a highly skilled delivery team, we blend cost-effective strate
Highlights
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+11 Services
4% E-Commerce Development
8% Custom Web Application Development
7% Mobile App Development (iOS & Android)
4% API Development & Integration
AI Summary
“Aarsis is a Sydney-based software development firm delivering custom web, mobile, cloud, AI, and automation solutions that enhance business efficiency and customer engagement globally.”
codoteam
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We focus on developing engaging, user-friendly websites and applications that enhance interaction and provide outstanding digital experiences. By merging innovative design with state-of-the-art technology, we transform concepts into meaningful solutions.
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
7% API Development & Integration
10% E-Commerce Development
17% Mobile App Development (iOS & Android)
20% Product Design
AI Summary
“Codoteam specializes in crafting innovative websites and applications, blending advanced technology with user-centric design to deliver impactful digital experiences and effective solutions.”
OPULITICS
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Opulitics is a Turkish company specializing in software, research, and development, providing outstanding software solutions, project management, consulting, and training services to businesses in various sectors throughout Turkey and Europe.
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+3 Services
17% Custom Web Application Development
10% Mobile App Development (iOS & Android)
7% API Development & Integration
13% IT Compliance & Governance
AI Summary
“Opulitics is a Turkish software and R&D firm delivering comprehensive software solutions, project management, consulting, and training services across diverse industries in Turkey and Europe.”
2Bit Global LLC
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2Bit Global creates digital ecosystems for enterprises that are efficient, secure, and scalable. We merge engineering expertise, AI advancements, and robust infrastructure to achieve transformative results with quantifiable impacts across worldwide markets.
Highlights
$1,000+
Min Project Size
2-9
Employees
Services Provided+9 Services
5% Mobile App Development (iOS & Android)
10% Custom Web Application Development
8% API Development & Integration
3% E-Commerce Development
AI Summary
“2Bit Global LLC develops secure, scalable digital ecosystems by integrating engineering, AI, and infrastructure expertise, delivering transformative, measurable solutions across global enterprise markets.”
Kraft Web Agency
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At Kraft Web Agency, we go beyond mere design, coding, and development; we focus on innovation, collaboration, and providing digital solutions that enhance your brand's presence online. We invite you to partner with us as we turn ideas into meaningful digital experiences. Your success is our main go
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
10-49
Employees
Services Provided+6 Services
15% Custom Web Application Development
8% API Development & Integration
2% E-Commerce Development
16% Product UX Strategy
AI Summary
“Kraft Web Agency delivers innovative digital solutions through collaborative design and development, prioritizing client goals with transparent communication to enhance online brand presence.”
Speedinno Pvt Ltd
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SpeedInno assists startups, small and medium businesses, institutions, and large enterprises in developing and upgrading software efficiently and systematically. Our services encompass web and mobile applications, SaaS platforms, enterprise solutions, internal tools, product engineering, and adaptab
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+7 Services
5% E-Commerce Development
8% Mobile App Development (iOS & Android)
7% API Development & Integration
10% Custom Web Application Development
AI Summary
“Speedinno Pvt Ltd delivers comprehensive software development services including web, mobile, SaaS, and enterprise solutions, supporting diverse businesses with strategic and agile engineering expertise.”
Node8 Innovations
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At Node8 Innovations, we understand that exceptional digital products are not simply created, but thoughtfully crafted. Our team consists of creative thinkers, builders, and dreamers who are passionate about transforming ideas into enjoyable, functional experiences. Whether we're developing a seamle
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+22 Services
5% API Development & Integration
3% CMS Development & Customization
2% Progressive Web App (PWA) Development
4% Custom Web Application Development
AI Summary
“Node8 Innovations crafts user-centric digital products, offering web and app development, UI/UX design, AI-driven tools, integrations, SEO, and data visualization with collaborative precision.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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