TopFirms REVIEWER

Top API Development Companies

Design, development, documentation, versioning, and security hardening of robust, scalable RESTful APIs, GraphQL endpoints, and webhook systems that enable seamless integration between internal systems, third-party services, mobile apps, and partner ecosystems.

4 companies found

Featured
1
SapientPro

SapientPro

Verified

SapientPro is a custom software development company founded in 2017, building robust APIs and backend systems for SaaS platforms, Web3 products, mobile applications, and enterprise software for startups and SMEs globally. With a 70+ person team and 200+ projects delivered, SapientPro designs and develops scalable, secure APIs that power seamless data exchange between products, third-party services, and payment or CRM systems. Rated 5/5 on Clutch, clients value the firm's full ownership approach, strong engineering standards, proactive problem-solving, and consistent ability to deliver complex API integrations on schedule.

5.0 (10)
API Development Web Development Software Development +4
Min. project
$5,000+
Hourly
$25 - $49
Team
50-249
Location
Luzern, Switzerland
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2
DATAFOREST

DATAFOREST

Verified

DATAFOREST is a data-driven technology company that builds custom APIs and integration solutions for enterprises in healthcare, finance, retail, and logistics. The company focuses on creating secure, high-performance APIs that connect data pipelines, AI models, machine learning outputs, and third-party systems, enabling different applications to work together smoothly and at scale. By designing reliable API infrastructure, DATAFOREST enables organizations to move data efficiently between systems without performance issues or bottlenecks. Clients on Clutch, where projects range from $8K to $460K+, often highlight the team’s strong technical skills in Python, AWS, REST architecture, and ETL integration, along with a practical, transparent approach to delivery and a consistent ability to meet agreed timelines and budgets.

5.0 (10)
API Development AI Development BI & Big Data Consulting & SI +5
Min. project
$10,000+
Hourly
$50 - $99
Team
50-249
Location
Kyiv, Ukraine
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3
Art IT - Intelligent Technology

Art IT - Intelligent Technology

Verified

ART IT - Intelligent Technology is a software company founded in 2002 based in Campinas, São Paulo, with over 20 years of experience in transforming businesses into experiences. Its API development efforts support the company's software delivery efforts, spanning the connections between systems and the software integrations that drive the unique platforms the company creates for customers including Embraer, NTT and Logicalis. ART IT has approximately 150 employees, and operates based on the Design Thinking and DevOps delivery model, which gives enterprise clients trust in technically sound and well-integrated software.

0.0 (0)
API Development Architectural Design UX/UI Design +8
Min. project
$10,000+
Hourly
< $25
Team
250-999
Location
Campinas, Brazil
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4
VeryCreatives - SaaS Development

VeryCreatives - SaaS Development

Verified

VeryCreatives – SaaS Development is a software company based in Budapest, Hungary, founded in 2015 to offer API development services such as RESTful API design and development, third-party API integration, API architecture for SaaS and web platforms, and others to startups and businesses in need of scalable, well-structured API interfaces which connect systems reliably. VeryCreatives has a technical team of 10–49 members with an hourly rate of $50–99 and a positive feedback rate of 100%. They build API's that are well-documented, production-ready and ready to meet the integration needs of the complex digital products of today. Clients appreciate the team's technical accuracy, responsiveness, and API creation that fits into a bigger product design.

5.0 (10)
API Development Software Development UX/UI Design +5
Min. project
$25,000+
Hourly
$50 - $99
Team
10-49
Location
Budapest, Hungary
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Got Questions

Frequently asked questions

What is API development?

Building interfaces that allow software to communicate securely — enabling apps to share data, like a weather app pulling forecasts from a service.

Why develop custom APIs?

To connect internal systems, enable partner integrations, power mobile apps, or monetize data — for efficiency and new opportunities.

How long does API development take?

Simple REST APIs take 4–8 weeks; complex with authentication often 2–5 months.

What is the typical cost for API development?

Basic APIs range from $15,000–$50,000; advanced GraphQL or secure APIs commonly cost $60,000–$150,000+.

Can APIs handle high traffic?

Yes — designed with rate limiting, caching, and scalable backends to manage loads.

How secure are custom APIs?

Secure with OAuth, JWT, encryption, and monitoring to prevent unauthorized access.

Does it include documentation?

Yes — clear docs and SDKs for easy adoption by developers or partners.

What about API maintenance?

Ongoing versioning, updates, and monitoring to ensure reliability and compatibility.