RankFirms

Top RESTful APIs Companies

REST APIs dominate APIs: 83% of public APIs use REST, with the REST API management market rising from $5.42B to $32.77B by 2032 fueled by rapid enterprise adoption. Source: Amra and Elma LLC
RESTful APIs remain the foundation of modern software architecture, powering seamless communication between applications, services, and devices. By adhering to stateless principles and standard HTTP methods, REST APIs give developers flexibility, scalability, and broad ecosystem support. As businesses prioritize digital transformation, REST API development is a core strategy for microservices, cloud services, web apps, and mobile platforms. Whether you need custom backend integrations, API governance, or secure REST services, choosing the right developer or agency ensures high performance, strong documentation, and long-term scalability. This guide highlights leading RESTful API expertise, industry trends, and FAQs for selecting the best partner for your API initiatives.

 

List of the Best RESTful APIs Agencies | Top RESTful APIs Companies in the World

Innowise

5 (3)
Innowise is a custom software development company headquartered in Warsaw, Poland, with additional offices around the globe. With more than 2500 specialists on board and 1300 projects completed, we use cutting-edge technologies to transform our clients' businesses. We are experts in the design and development of tech solutions that will help your company enhance its processes and increase customer satisfaction… Read More
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  • Dollar
    Employees: 1,000 - 9,999
  • Dollar
    Min. Project amount: $10,000+
  • Dollar
    Country: Warszawa, Poland

Simform

5 (2)
Simform is a premier digital engineering company specializing in Cloud, Data, AI/ML, and Experience Engineering to create seamless digital experiences and scalable products. Simform, with its deep engineering DNA and unique co-engineering delivery model, is renowned for building future-proof digital products for high-growth ISVs and tech-enabled enterprises. Our deep-rooted heritage in UX-led experience engineering, coupled with our unparalleled expertise in… Read More
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  • Dollar
    Employees: 1,000 - 9,999
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    Min. Project amount: $25,000+
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    Country: Orlando, FL, USA

Altar.io

5 (2)
Altar.io is an award-winning product and software development company committed to helping entrepreneurs and business leaders worldwide build high-quality, user-centric products. What makes them different: Formed by ex-startup founders, Altar.io has deep roots in the startup ecosystem, bringing innovative products to market with a unique understanding of entrepreneurial challenges. At their core, they design and build high-quality, user-centric software products.… Read More
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  • Dollar
    Employees: 10-49
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    Min. Project amount: $25,000+
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    Country: Lisboa, Portugal
DQOT Solutions stands as a prominent global service provider, specializing in Software Development, Mobile App Development, and Website Development. With established operations in both the United States and the United Kingdom, we are dedicated to delivering innovative digital solutions to a diverse client base that includes startups, large enterprises, and government organizations across the globe. Read More
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  • Dollar
    Min. Project amount: $1,000+
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    Country: Jaipur, India
Kode Tech (Pvt) Ltd is a well-established and renowned software development company with a rich legacy spanning over 14 years. Our extensive expertise has earned us a strong foothold in 15 international markets, where we've successfully delivered over 1500 projects. Our core competencies encompass a wide spectrum of cutting-edge technologies, including software development, artificial intelligence, blockchain, and metaverse solutions. Read More
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  • Dollar
    Employees: 11 - 50
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    Min. Project amount: $1,000+
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    Country: Colombo 05, Sri Lanka

Halfnine

0 (0)
Based in the US, Halfnine helps businesses achieve their goals through technology. They offer a range of services including custom software development, managed IT services. They focus on delivering measurable value and clear communication throughout the project lifecycle. Read More
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  • Dollar
    Employees: 0 to 10
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    Min. Project amount: $5,000+
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    Country: Orlando, Florida, USA

Cubix

4.9 (2)
Cubix is a full-stack software development company, empowering businesses to thrive in the modern era through innovative mobile apps, mobile games, custom software solutions, and cutting-edge technologies like blockchain and AI. With over 17 years of experience, Cubix is a trusted partner for enterprises, SMEs, and Fortune 500s seeking an innovation partner to leverage the power of cutting technology to… Read More
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  • Dollar
    Employees: 251 - 500
  • Dollar
    Min. Project amount: $25,000+
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    Country: 560 Village Blvd. Suite 120, #3 West Palm Beach, FL 33409
Solvios Technology is a leading provider of innovative digital solutions tailored to meet the evolving needs of businesses. With a focus on leveraging cutting-edge technologies, Solvios offers a comprehensive range of services, including software development, IT consulting, cloud solutions, cybersecurity, and digital transformation strategies. Our team of experienced professionals is dedicated to delivering high-quality solutions that drive business growth, enhance… Read More
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  • Dollar
    Employees: 11-50
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    Min. Project amount: $25000
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    Country: USA and India
We are experienced web/mobile/game developers, project leaders and architects in the field of PHP, AngularJS, NodeJS, React Native, ReactJS, JAVA enterprise, Frameworks, Databases, iOS/Android, HTML5/CSS, RestAPI, Javascript, ES6, WordPress, Drupal, design UI/UX and much more, and will support you in your projects no matter how custom or complex they are. We do love what we do, and it is easy… Read More
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  • Dollar
    Employees: 51 to 100
  • Dollar
    Min. Project amount: $ 25000
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    Country: U.S.A
10 Years of Industry Experience CAAZ brings together more than 10 years in the software and technology industry. Our experience in building software products and launching start-ups allows us to deliver results effectively and efficiently for our clients. 32 Team Members CAAZ consists of core team members on-shore in the United States, and talented developers located overseas in Bangladesh. Our… Read More
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  • Dollar
    Employees: 11 to 50
  • Dollar
    Min. Project amount: $25000
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    Country: USA

1.What services do RESTful API developers or agencies provide?

They design and build stateless, scalable REST APIs, handle API documentation & testing, integrate with backend systems, implement authentication/security, and support deployment & monitoring.

RESTful API developers or agencies provide a wide range of services centered around the design, development, deployment, and maintenance of RESTful APIs. Their offerings typically include:

1. API Design & Architecture

  • Designing API endpoints, data models, and request/response structures following RESTful principles.
  • Defining authentication and authorization mechanisms (e.g., OAuth, JWT).
  • Creating API documentation and specifications (often using OpenAPI/Swagger).
  • Ensuring scalability, security, and maintainability in the API architecture.

2. API Development

  • Implementing API endpoints using popular frameworks and programming languages (such as Node.js, Python, Java, Ruby, or PHP).
  • Integrating APIs with databases, third-party services, or other internal systems.
  • Handling versioning, error handling, and response formatting.

3. API Integration

  • Connecting client applications (web, mobile, IoT) to APIs.
  • Facilitating integration with external APIs, SaaS products, or legacy systems.
  • Providing SDKs or client libraries for easier API consumption.

4. Testing & Quality Assurance

  • Writing unit, integration, and end-to-end tests for API endpoints.
  • Performing load testing and performance optimization.
  • Ensuring compliance with security best practices (e.g., input validation, rate limiting).

5. API Documentation & Developer Experience

  • Creating clear, interactive documentation for developers (using Swagger, Postman, Redoc, etc.).
  • Providing API usage guides, code samples, and onboarding support.

6. Deployment & DevOps

  • Setting up API hosting environments (cloud platforms, on-premises, serverless).
  • Managing CI/CD pipelines for API deployment and updates.
  • Configuring monitoring, logging, and alerting for production APIs.

7. API Maintenance & Support

  • Ongoing monitoring and debugging of API issues.
  • Applying security patches, performance improvements, and new features.
  • Managing API deprecation and migration strategies.

8. Consulting & Advisory

  • Reviewing existing APIs for best practices, performance, and security.
  • Advising on API strategy, monetization, and digital transformation initiatives.
  • Training internal teams on API design, usage, and management.

In summary, RESTful API developers or agencies act as end-to-end partners for organizations looking to expose, consume, or manage APIs, ensuring robust, secure, and scalable digital integrations.

2.Should I hire a REST API specialist developer or an agency?

Choose individual developers for lean/short-term builds or smaller projects; agencies are ideal for complex, enterprise-grade API ecosystems with broader technical needs.

RESTful API developers or agencies provide a wide range of services centered around the design, development, deployment, and maintenance of RESTful APIs. Their offerings typically include:

1. API Design & Architecture

  • Designing API endpoints, data models, and request/response structures following RESTful principles.
  • Defining authentication and authorization mechanisms (e.g., OAuth, JWT).
  • Creating API documentation and specifications (often using OpenAPI/Swagger).
  • Ensuring scalability, security, and maintainability in the API architecture.

2. API Development

  • Implementing API endpoints using popular frameworks and programming languages (such as Node.js, Python, Java, Ruby, or PHP).
  • Integrating APIs with databases, third-party services, or other internal systems.
  • Handling versioning, error handling, and response formatting.

3. API Integration

  • Connecting client applications (web, mobile, IoT) to APIs.
  • Facilitating integration with external APIs, SaaS products, or legacy systems.
  • Providing SDKs or client libraries for easier API consumption.

4. Testing & Quality Assurance

  • Writing unit, integration, and end-to-end tests for API endpoints.
  • Performing load testing and performance optimization.
  • Ensuring compliance with security best practices (e.g., input validation, rate limiting).

5. API Documentation & Developer Experience

  • Creating clear, interactive documentation for developers (using Swagger, Postman, Redoc, etc.).
  • Providing API usage guides, code samples, and onboarding support.

6. Deployment & DevOps

  • Setting up API hosting environments (cloud platforms, on-premises, serverless).
  • Managing CI/CD pipelines for API deployment and updates.
  • Configuring monitoring, logging, and alerting for production APIs.

7. API Maintenance & Support

  • Ongoing monitoring and debugging of API issues.
  • Applying security patches, performance improvements, and new features.
  • Managing API deprecation and migration strategies.

8. Consulting & Advisory

  • Reviewing existing APIs for best practices, performance, and security.
  • Advising on API strategy, monetization, and digital transformation initiatives.
  • Training internal teams on API design, usage, and management.

In summary, RESTful API developers or agencies act as end-to-end partners for organizations looking to expose, consume, or manage APIs, ensuring robust, secure, and scalable digital integrations.

Should I hire a REST API specialist developer or an agency? Choose individual developers for lean/short-term builds or smaller projects; agencies are ideal for complex, enterprise-grade API ecosystems with broader technical needs.

When deciding between hiring a REST API specialist developer or an agency, consider the scale, complexity, and long-term needs of your project:

Choose an individual developer if:

  • Your project is lean, short-term, or focused on a single, well-defined API.
  • You have a limited budget and want a cost-effective solution.
  • Your technical requirements are straightforward, and you can manage project oversight directly.
  • You need rapid prototyping or a quick MVP (Minimum Viable Product).

Choose an agency if:

  • Your project is complex, large-scale, or enterprise-grade, requiring robust architecture and scalability.
  • You need a team with diverse skills (e.g., design, development, QA, DevOps, security).
  • You expect ongoing support, maintenance, or integration with other systems.
  • You want comprehensive services, from strategy and consulting to deployment and documentation.
  • Project management, risk mitigation, and adherence to best practices are priorities.

Summary:
Go with an individual developer for smaller, focused, or short-term builds. Opt for an agency when your REST API needs are part of a broader, more complex technical ecosystem requiring multidisciplinary expertise and long-term support.

3.What technologies do top REST API developers use?

Common stacks include Node.js/Express, Python (Django/Flask), Java/Spring Boot, Go, and REST API tools like Postman and OpenAPI/Swagger for specs.

Top REST API developers utilize a range of technologies, tools, and best practices to design, build, test, and maintain high-quality APIs. Here’s an overview of the core technologies and approaches commonly used:

1. Programming Languages & Frameworks

  • JavaScript (Node.js/Express.js): Widely used for its asynchronous capabilities and vast ecosystem.
  • Python (Django REST Framework, Flask): Popular for rapid development and robust community support.
  • Java (Spring Boot): Enterprise-grade APIs with powerful tooling and scalability.
  • Go (Gin, Echo): Chosen for high performance and simplicity in concurrency.
  • Ruby (Rails – with built-in API support): Quick prototyping and developer productivity.
  • .NET (ASP.NET Core): Strong in enterprise and Windows-centric environments.

2. API Specification & Documentation

  • OpenAPI (Swagger): Standard for describing RESTful APIs, enabling auto-generation of docs, clients, and server stubs.
  • Postman Collections: For interactive API documentation and sharing.
  • Redoc: For visually appealing and interactive documentation based on OpenAPI.

3. Data Formats

  • JSON: Default choice for API payloads due to simplicity and ubiquity.
  • XML: Still used in legacy or enterprise contexts.
  • YAML: Sometimes used for configuration, rarely for payloads.

4. Authentication & Security

  • OAuth 2.0 / OpenID Connect: Standard for delegated authorization.
  • JWT (JSON Web Tokens): For stateless authentication.
  • API Keys: Simple, but less secure; often used for internal or less sensitive APIs.
  • HTTPS (TLS): Mandatory for encrypting API traffic.

5. Testing & Debugging Tools

  • Postman: Popular for manual API testing and automation.
  • Insomnia: Another user-friendly API client.
  • curl/HTTPie: Command-line tools for quick API calls.
  • Automated Testing Frameworks: Jest (JS), Pytest (Python), JUnit (Java), etc.

6. Monitoring & Logging

  • API Gateways: Kong, AWS API Gateway, Apigee – for rate limiting, analytics, and security.
  • Logging Tools: ELK Stack (Elasticsearch, Logstash, Kibana), Splunk.
  • APM (Application Performance Monitoring): New Relic, Datadog.

7. DevOps & Deployment

  • Containerization: Docker for consistent deployment environments.
  • Orchestration: Kubernetes for scaling and managing microservices.
  • CI/CD Pipelines: Jenkins, GitHub Actions, GitLab CI for automated testing and deployment.

8. Versioning & Best Practices

  • URI Versioning: e.g., /api/v1/resource
  • Semantic Versioning: For backward compatibility.
  • Rate Limiting: To prevent abuse.
  • CORS Management: For cross-origin requests.

Summary

Top REST API developers combine robust programming frameworks, open standards for documentation, secure authentication methods, and modern DevOps practices. They leverage both manual and automated tools for testing, maintain clear versioning, and prioritize security and performance monitoring throughout the API lifecycle. This ecosystem allows for scalable, maintainable, and secure REST APIs.

4.How much does hiring a REST API developer or agency cost?

The cost of hiring a REST API developer or agency depends on several factors, including the developer’s location, experience, project complexity, and whether you work with a freelancer or a professional agency. Here’s a more detailed breakdown:

1. Freelance REST API Developers

  • Entry-level: $20–$40/hr (often overseas or early-career developers)
  • Mid-level: $40–$75/hr (developers with several years’ experience, good portfolio)
  • Senior/Expert: $75–$150/hr+ (specialized skills, high-demand locations, or niche expertise)

Freelancers can also work on a fixed-price basis, with simple APIs starting at a few hundred dollars and complex, production-grade APIs costing several thousand dollars.

2. REST API Development Agencies

  • Small/Regional Agencies: $75–$150/hr
  • Established or Specialized Agencies: $150–$250/hr+
  • Top-tier/Enterprise Agencies: $250/hr and up

Agencies typically estimate costs based on project requirements, and may provide a fixed project quote. For reference:

  • Simple API (single resource, basic CRUD): $2,000–$10,000
  • Medium API (multiple resources, authentication, documentation): $10,000–$30,000
  • Complex API (integrations, scalability, security, analytics): $30,000–$100,000+

3. Additional Factors Affecting Cost

  • Project Scope: More endpoints, integrations, and features increase cost.
  • Security and Compliance: APIs requiring advanced security, compliance (GDPR, HIPAA, etc.) are more expensive.
  • Maintenance & Support: Ongoing costs for updates, bug fixes, and enhancements.
  • Location: Developers in North America and Western Europe bill higher than those in Asia, Eastern Europe, or Latin America.

Summary

  • Freelancers: ~$25/hr to $150/hr+, or $2,000–$10,000+ for a project.
  • Agencies: $75/hr to $250/hr+, or $10,000–$100,000+ for complex APIs.

For the best results, define your project scope and requirements clearly before seeking quotes, and always review portfolios, references, and technical proficiency.

Costs vary widely: freelance developers often start ~$25/hr+, while experienced agency teams generally bill higher based on project scope and expertise. 

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