Best API Development Companies in the USA

3 min
Targets we’ve achieved:
Increased US Software Development Company's annually acquired clients by 400% *
Generated 50+ business opportunities for UK Architecture & Design Services Provider *
Reduced cost per lead by over 6X for Dutch Event Technology Company *
Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
Boosted conversion rate of Ukrainian IT Company by 53.6% *
Increased US Software Development Company's annually acquired clients by 400% *
Generated 50+ business opportunities for UK Architecture & Design Services Provider *
Reduced cost per lead by over 6X for Dutch Event Technology Company *
Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
Boosted conversion rate of Ukrainian IT Company by 53.6% *
Increased US Software Development Company's annually acquired clients by 400% *
Generated 50+ business opportunities for UK Architecture & Design Services Provider *
Reduced cost per lead by over 6X for Dutch Event Technology Company *
Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
Boosted conversion rate of Ukrainian IT Company by 53.6% *
Increased US Software Development Company's annually acquired clients by 400% *
Generated 50+ business opportunities for UK Architecture & Design Services Provider *
Reduced cost per lead by over 6X for Dutch Event Technology Company *
Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
Boosted conversion rate of Ukrainian IT Company by 53.6% *
Increased US Software Development Company's annually acquired clients by 400% *
Generated 50+ business opportunities for UK Architecture & Design Services Provider *
Reduced cost per lead by over 6X for Dutch Event Technology Company *
Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
Boosted conversion rate of Ukrainian IT Company by 53.6% *
Increased US Software Development Company's annually acquired clients by 400% *
Generated 50+ business opportunities for UK Architecture & Design Services Provider *
Reduced cost per lead by over 6X for Dutch Event Technology Company *
Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
Boosted conversion rate of Ukrainian IT Company by 53.6% *
Max Mykal
Co-Founder @ Lengreo

    Introduction

    APIs are the backbone of modern apps – they help different systems talk to each other and keep everything running smoothly. Whether you’re building a mobile app, integrating payment systems, or creating a platform from scratch, the right API development company can make all the difference.

    In this article, we’ve rounded up some of the top API development companies across the USA. These teams know how to build secure, scalable, and reliable APIs that work with your business – not against it.

    1. LenGreo

    1. LenGreo

    At LenGreo, we specialize in web and API development, working with businesses in the USA and globally. While our team is international, we maintain a strong connection to the U.S. market, partnering with American companies across various industries. Our focus is on building practical, secure, and scalable digital solutions that help businesses integrate systems and improve performance.

    We follow a structured approach to development – starting with discovery workshops to understand each project’s goals and context, then moving into wireframing, iterative development, deployment, and ongoing optimization. This helps us stay aligned with our clients’ needs and ensure the API or web app functions smoothly in real-world scenarios.

    Our developers use technologies like React.js, Node.js, Laravel, Ruby on Rails, and others, allowing us to adapt to different technical environments. We’re also big on quality testing – both manual and automated – so everything we build is reliable and ready for long-term use.

     

    Key Highlights:

    • Collaborate with U.S.-based clients across different sectors
    • Follow a step-by-step process from discovery to optimization
    • Blend front-end and back-end expertise for flexible API solutions
    • Prioritize testing to ensure smooth and secure integration

     

    Services:

    • API creation
    • Custom web application development
    • Hybrid mobile app development
    • Web design
    • Tech stack modernization
    • Cloud-native system development

     

    Contacts:

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    2. Guava Trees Softech

    2. Guava Trees Softech

    Guava Trees Softech is a software development company that offers custom API development services for businesses aiming to improve integration, connectivity, and data sharing across digital systems. Their API solutions are designed to support secure communication between applications, enabling better workflows and system interoperability. The company works with various types of APIs, including external, internal, and composite APIs, and builds them to meet specific organizational needs.

    The development process at Guava Trees Softech is built around modern architectures and industry-standard security practices. Their team provides end-to-end support, from planning and implementation to ongoing management. The APIs are structured to allow modular growth, enhance user experience, and support scalable business operations, especially in microservices-based and cloud-native environments.

     

    Key Highlights:

    • Focus on secure and scalable API architecture
    • Expertise in external, internal, and composite APIs
    • Designed for better integration and data flow
    • Supports modular and scalable system design
    • Incorporates standard authentication methods for security

     

    Services:

    • API development
    • Cloud-native application development
    • Mobile application development
    • Custom software development
    • SaaS solutions
    • Digital transformation and legacy system migration
    • Third-party systems integration
    • Enterprise application development
    • Full software development lifecycle (SDLC) support
    • Dashboard development

     

    Contacts:

    • Website: www.guavatrees.com
    • E-mail: sales@guavatrees.com
    • Facebook: www.facebook.com/guavatrees
    • Twitter: x.com/guavatrees_
    • LinkedIn: www.linkedin.com/company/guavatrees
    • Instagram: www.instagram.com/guavatrees_
    • Address: 47, Sabri Villa, 2nd Floor, Lala Lajpat Rai Colony, Bagh Dil Kusha, Bhopal, Madhya Pradesh – 462023, India
    • Phone: +91 7554259814

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      3. ScienceSoft

      3. ScienceSoft

      ScienceSoft is a software engineering company that offers custom API development services designed to help businesses connect their applications internally and with third-party systems. With experience across a wide range of industries, the company supports organizations looking to enhance how their systems communicate and share data. Their focus is on building secure, scalable, and documented APIs that support seamless integration and workflow automation.

      The company approaches API development with a structured methodology that includes consulting, implementation, management, and long-term support. They also incorporate quality assurance and security practices throughout the development process. ScienceSoft’s services are designed to accommodate different business needs, whether clients require a new API from scratch or ongoing support for existing integrations.

       

      Key Highlights:

      • Provides full-cycle API development, from design to long-term support
      • Incorporates cybersecurity practices, including penetration testing and monitoring
      • Offers ISO-certified quality and security management frameworks
      • Experience in various industries such as healthcare, retail, and telecom
      • Applies structured project management and reporting methods

       

      Services:

      • API consulting
      • API design and implementation
      • API management
      • End-to-end API development and support

       

      Contacts:

      • Website: www.scnsoft.com
      • E-mail: contact@scnsoft.com
      • Facebook: www.facebook.com/sciencesoft.solutions
      • Twitter: x.com/ScienceSoft
      • LinkedIn: www.linkedin.com/company/sciencesoft
      • Address: 5900 S. Lake Forest Drive, Suite 300 McKinney, Dallas area, TX-75070
      • Phone: +1 214 306 68 37
      4. PNN Soft

      4. PNN Soft

      PNN Soft is a software development company offering services in API development and integration. The company works with a variety of API protocols, including REST, SOAP, XML, and RPC, and delivers both internal and external solutions tailored to specific business needs. Their approach focuses on building scalable and structured APIs that help improve and modernize existing systems or enable the integration of new ones.

      PNN Soft supports businesses in implementing service-oriented architectures across mobile, web, and cloud platforms. Their API development work includes attention to data security, adaptation to various systems, and flexibility in working with different industries. The company also uses a range of software development methodologies, depending on the project’s needs, to ensure a consistent and efficient workflow.

       

      Key Highlights:

      • Offers custom and third-party API integration
      • Works with REST, SOAP, XML, and RPC API protocols
      • Implements API solutions for mobile, web, and cloud applications
      • Emphasizes data security and system compatibility
      • Uses Agile, DevOps, and other development methodologies

       

      Services:

      • Custom API Development
      • API Integration and Customization
      • Testing Services
      • Support and Maintenance
      • Dedicated Development Teams

       

      Contacts:

      • Website: pnnsoft.com
      • E-mail: info@pnnsoft.com
      • Facebook: www.facebook.com/pnnsoft
      • Twitter: x.com/pnn_soft
      • LinkedIn: www.linkedin.com/company/pnn-soft
      • Address: 182-184 High Street North, East Ham, London, UK
      • Phone: (+380) 44 355 30 35
      5. Kong

      5. Kong

      Kong is a company that provides a comprehensive platform for building, running, and managing APIs across a variety of architectures, including cloud, on-premises, and hybrid environments. Its solutions are designed to help organizations modernize their infrastructure and unify their API operations, enabling smoother workflows and greater operational consistency. Kong supports the full API lifecycle – from development to governance – while emphasizing automation, scalability, and collaboration between teams.

      The company offers tools that integrate with popular development and DevOps practices, supporting CI/CD pipelines, GitOps, and infrastructure as code. It also focuses on enabling governance, observability, and security across APIs, including event-driven and AI-powered interfaces. Kong’s platform is used by organizations across various industries to streamline API management, simplify developer experience, and accelerate product delivery timelines.

       

      Key Highlights:

      • Centralized governance for APIs, including event-driven and AI APIs
      • Built-in automation for API lifecycle through APIOps and CI/CD integration
      • Developer-centric features like self-service platforms and API cataloging
      • Cloud-native architecture that supports both legacy and modern systems
      • Ecosystem of plugins and integrations to extend API functionality

       

      Services:

      • API gateway and traffic management
      • Event API and AI API support
      • Ingress controller and service mesh solutions
      • API lifecycle management and governance
      • Developer portal and analytics tools
      • Declarative configuration tools and Kubernetes operator support

       

      Contacts:

      • Website: konghq.com
      • Twitter: x.com/thekonginc
      • LinkedIn: www.linkedin.com/company/konghq
      6. Zazz

      6. Zazz

      Zazz is a digital product development company with a strong focus on mobile applications, API development, and emerging technologies. With offices in several international cities, including San Francisco, Toronto, and London, Zazz provides development services for a diverse range of industries and clients, including startups, enterprises, and government entities. Their team consists of developers and consultants specializing in creating scalable and secure digital solutions that address both front-end and back-end requirements.

      The company emphasizes an agile approach to software development, prioritizing real-time collaboration and adaptability throughout the project lifecycle. Zazz offers tailored services that support integration with third-party systems, cloud platforms, and mobile technologies. Their experience spans areas such as API integration, app design, and development for various operating systems and devices.

       

      Key Highlights:

      • Offers development services across multiple platforms and industries
      • Uses agile methodologies to guide project execution
      • Maintains teams with expertise in multiple programming languages and frameworks
      • Provides services for both private sector and public sector clients
      • Operates in several locations, including North America, Europe, and Asia

       

      Services:

      • API development and integration
      • iOS and Android app development
      • Web development and UI/UX design
      • Cloud computing and IoT solutions
      • Blockchain and augmented reality application development
      • Custom software and enterprise application development
      • Front-end and back-end development
      • Virtual reality app development

       

      Contacts:

      • Website: www.zazz.io
      • Facebook: www.facebook.com/Zazz.Official
      • Twitter: x.com/Zazz_Official
      • LinkedIn: www.linkedin.com/company/zazz-io
      • Instagram: www.instagram.com/zazz.io
      • Address: 405 Lexington Avenue, 26th Floor, Manhattan, NY 10174
      7. Belitsoft

      7. Belitsoft

      Belitsoft is a software development company that offers custom API integration and development services. Their team of API engineers has expertise in designing, developing, and integrating APIs across various platforms and industries. Belitsoft provides solutions that include creating custom APIs to enhance existing software, facilitating real-time data sharing, and automating workflows. They also offer API consulting services to assist clients in making informed technical decisions and ensuring compliance with regulatory and security requirements.

      In addition to API development, Belitsoft specializes in integrating APIs for machine learning tools, enabling applications to perform tasks such as content generation, sentiment analysis, and document summarization. Their services extend to developing web APIs for data sharing with third-party applications and integrating webhooks to provide real-time notifications. Belitsoft’s approach includes implementing security measures like HTTPS, token-based authentication, and access control to protect sensitive data.

       

      Key Highlights:

      • Custom API development and integration for various platforms
      • Expertise in REST and GraphQL APIs
      • API consulting services for strategic decision-making
      • Integration of machine learning tools and large language models
      • Development of web APIs and implementation of webhooks
      • Security measures including HTTPS and token-based authentication

       

      Services:

      • Custom API development
      • API integration services
      • API consulting
      • Machine learning API integration
      • Web API development
      • Webhook development and integration
      • API security implementation

       

      Contacts:

      • Website: belitsoft.com
      • E-mail: info@belitsoft.com
      • Facebook: www.facebook.com/Belitsoft
      • Twitter: x.com/BelitsoftCom
      • LinkedIn: www.linkedin.com/company/belitsoft-llc
      • Phone: +1 (917) 410-57-57
      8. ManekTech

      8. ManekTech

      ManekTech is a software development company that focuses on delivering tailored API development and integration services. With experience spanning various industries such as e-commerce, healthcare, manufacturing, and customer management, the company develops APIs that help connect applications, streamline data flow, and support feature expansion. Its approach to API development supports cross-platform compatibility, enabling applications to interact with data, devices, and other services efficiently.

      In addition to creating custom APIs, ManekTech also works with third-party integrations, cloud-based systems, and mobile platforms. Their services are designed to reduce development costs and time while helping businesses maintain their existing infrastructure. The company operates internationally, with offices in the USA, UK, India, Germany, and South Africa, and maintains a presence across web, mobile, and cloud technology ecosystems.

       

      Key Highlights:

      • Develops custom and third-party APIs for a wide range of industries
      • Supports mobile, web, and cloud platforms
      • Helps businesses streamline system compatibility without infrastructure overhaul
      • Offers solutions focused on scalability, performance, and security
      • Maintains a global presence with development and consulting teams across continents

       

      Services:

      • Custom API Development
      • Third-Party API Integration
      • API Development for Cloud Platforms
      • API Development for Web-Based Services
      • API Development for Mobile Applications

       

      Contacts:

      • Website: www.manektech.com
      • E-mail: info@manektech.com
      • Facebook: www.facebook.com/ManekTech-191482567545069
      • Twitter: x.com/manektech
      • LinkedIn: www.in.linkedin.com/company/manektech
      • Instagram: www.instagram.com/manektech
      • Address: 4100 NW Loop 410, Suite 200, San Antonio, Texas, USA 78229
      9. Apriorit

      9. Apriorit

      Apriorit offers API integration services as part of its broader software development expertise. The company focuses on helping clients build, manage, and improve API-based solutions to ensure smooth data exchange and streamlined communication between systems. Apriorit’s approach involves understanding the business needs, designing efficient API architectures, and implementing secure and scalable integration strategies.

      The team works with a range of API types, including REST, SOAP, and GraphQL, and provides support throughout the entire lifecycle – from initial consulting and development to maintenance and testing. Their API integration services are suited for different use cases, including connecting cloud services, linking internal enterprise systems, and enabling third-party integrations.

       

      Key Highlights:

      • Offers support for various types of APIs, including REST, SOAP, and GraphQL
      • Provides assistance across the full API development and integration lifecycle
      • Focuses on compatibility, data security, and efficient system communication
      • Works with clients from different industries and technical backgrounds

       

      Services:

      • Custom API development
      • API integration and optimization
      • API testing and quality assurance
      • API documentation and support
      • Legacy system integration through APIs
      • Cloud service API integration

       

      Contacts:

      • Website: www.apriorit.com
      • E-mail: info@apriorit.com
      • Facebook: www.facebook.com/apriorit
      • Twitter: x.com/apriorit
      • LinkedIn: www.linkedin.com/company/apriorit
      • Address: 60 Kendrick St. Suite 201 Needham, MA 02494, USA
      • Phone: +1 714-584-0295
      10. CMARIX

      10. CMARIX

      CMARIX is a software development company that delivers tailored technology solutions to businesses across a wide range of industries. With a focus on backend systems and integration, the company emphasizes collaboration between digital tools and systems. They provide support to organizations looking to streamline their platforms by integrating APIs that connect various applications and services. Their approach is structured around understanding a company’s specific needs and crafting solutions that improve workflow and connectivity.

      The company offers services that span web and mobile development, UI/UX design, and custom software development, with a particular emphasis on API integration. Their team applies agile practices in development and aims to support both established businesses and startups. CMARIX operates internationally, with offices in India, the USA, Canada, the UK, Germany, and Nigeria, and serves clients in sectors such as healthcare, education, insurance, and travel.

       

      Key Highlights:

      • Focuses on integrating APIs to improve system connectivity
      • Supports collaboration between web, mobile, and backend systems
      • Works across multiple industries including healthcare and banking
      • Uses agile methodologies for project execution
      • Offers client-centric and custom-tailored technology services

       

      Services:

      • API Integration Services
      • Custom Software Development
      • Web and Mobile App Development
      • UI/UX Design
      • QA and Testing Services
      • eCommerce Development
      • Maintenance and Support
      • AI and Generative AI Consulting
      • Code Audit Services
      • Developer Hiring (Full Stack, MEAN, MERN, Python, etc.)

       

      Contacts:

      • Website: www.cmarix.com
      • E-mail: biz@cmarix.com
      • Facebook: www.facebook.com/cmarixinfotech
      • Twitter: x.com/cmarixinfotech
      • LinkedIn: www.linkedin.com/company/cmarix
      • Instagram: www.instagram.com/cmarixinfotech
      • Address: 32572 Miller Ct. Temecula, CA 92592
      • Phone: +1 415-704-4242
      11. ClickySoft

      11. ClickySoft

      ClickySoft is a digital solutions provider that offers a range of services, including API integration, web and mobile development, and cloud consulting. The company focuses on creating tailored solutions to meet the specific needs of its clients, ensuring seamless connectivity and enhanced functionality across various platforms.

      With a team of experienced professionals, ClickySoft delivers services that cater to businesses seeking to optimize their digital presence. The company’s approach emphasizes collaboration and a deep understanding of client requirements to develop effective and efficient solutions.

       

      Key Highlights:

      • Provides custom API integration services to enhance business operations.
      • Offers web and mobile development solutions tailored to client needs.
      • Specializes in cloud consulting to support digital transformation efforts.
      • Emphasizes a collaborative approach to understand and meet client objectives.

       

      Services:

      • API Integration Services
      • Web Development
      • Mobile Application Development
      • Cloud Consulting Services
      • CRM and LMS Integration
      • Python and Node.js Development

       

      Contacts:

      • Website: clickysoft.com
      • E-mail: info@clickysoft.com
      • Facebook: www.facebook.com/ClickySoft
      • Twitter: x.com/clickysoft99
      • LinkedIn: www.linkedin.com/company/clicky-soft
      • Instagram: www.instagram.com/clickysoft
      • Address: 1423 Ashen Flock CT Katy TX, 77494
      • Phone: +1 (832) 847-6000
      12. SKAD IT Solutions

      12. SKAD IT Solutions

      SKAD IT Solutions is a technology company that provides custom API development services aimed at enhancing business connectivity and process efficiency. Their offerings focus on building Application Programming Interfaces (APIs) that help different software systems communicate with each other in real time. The company works with a variety of industries and emphasizes creating solutions that are tailored to specific business requirements.

      Their API development services include everything from designing and integrating APIs to managing and maintaining them throughout their lifecycle. By streamlining workflows, enabling automation, and ensuring data synchronization, SKAD IT Solutions helps businesses build scalable and secure systems that work smoothly together. Their approach combines modern technologies with a focus on aligning technical solutions to business goals.

       

      Key Highlights:

      • Develops APIs that support seamless communication between software systems
      • Focuses on data synchronization and process automation
      • Offers full API lifecycle support, from planning to ongoing management
      • Prioritizes scalability, security, and real-time integration

       

      Services:

      • Custom API Development
      • API Integration
      • API Lifecycle Management
      • API Security and Compliance
      • Support for Scalable System Expansion
      • Real-Time Data Synchronization Solutions

       

      Contacts:

      • Website: skadits.com
      • E-mail: info@skadits.com
      • Facebook: www.facebook.com/skaditsolutions
      • Twitter: x.com/skaditsolutions
      • LinkedIn: www.linkedin.com/company/skad-it-solutions-llc
      • Instagram: www.instagram.com/skad.it.solutions
      • Address: 827 Pioneer Rd #103, Draper, UT 84020, United States
      • Phone: +1 (801) 259-4800
      13. OpenXcell

      13. OpenXcell

      OpenXcell is a software development company with a focus on API development services. With experience across various sectors, the company delivers API consulting, integration, and management tailored to business needs. Their work spans cloud-based, mobile, and third-party API integrations, supporting both new builds and existing systems. OpenXcell’s team collaborates with clients across industries such as finance, healthcare, and logistics to implement APIs that connect systems and streamline operations.

      The company offers multiple engagement models, allowing for flexibility in project scope and timelines. Its approach includes custom development, scalable solutions, and ongoing support. OpenXcell operates internationally, maintaining a team of developers and engineers with experience in both frontend and backend technologies. In addition to its technical services, the company shares case studies and insights related to software and API development on its platform.

       

      Key Highlights:

      • Offers API integration and custom development for various industries
      • Works with multiple technologies including REST, mobile apps, and internal APIs
      • Supports both new software development and integration into existing systems
      • Provides flexible business models for collaboration
      • Shares case studies and blogs on technical implementation and strategy

       

      Services:

      • API consulting and design
      • Custom API development
      • API integration for mobile and web applications
      • Cloud and intranet API implementation
      • End-to-end API support and management
      • Third-party API integration

       

      Contacts:

      • Website: www.openxcell.com
      • E-mail: sales@openxcell.com
      • Facebook: www.facebook.com/openxcellai
      • Twitter: x.com/openxcell
      • LinkedIn: www.in.linkedin.com/company/openxcell
      • Address: 304 S. Jones Blvd #520 Las Vegas, NV 89107
      • Phone: +1 888 777 4629
      14. Narola Infotech

      14. Narola Infotech

      Narola Infotech provides API development and integration services aimed at connecting various applications, third-party systems, and websites to enhance operational efficiency. The company focuses on creating custom APIs for different platforms, ensuring that these interfaces support smooth communication between systems and improve overall user experience. Their approach includes designing APIs that are scalable, secure, and compatible with existing infrastructure.

      With a broad range of services related to APIs, Narola Infotech supports businesses in industries such as healthcare, fintech, e-commerce, and more. They emphasize structured project management, ongoing API maintenance, and integration with popular third-party services including shipping carriers, payment gateways, and social networks. Their work also covers API testing and consulting to help organizations navigate complex integration challenges.

       

      Key Highlights:

      • Custom API development for public, private, and microservices
      • API integration with various third-party platforms and applications
      • Focus on scalability, security, and seamless system connectivity
      • Industry-specific solutions tailored to client needs
      • Ongoing support, maintenance, and testing for APIs
      • Strategic consulting to guide API implementation and integration

       

      Services:

      • Custom API Development
      • Mobile API Development for Android, iOS, and cross-platform apps
      • Web API Development
      • API Integration Services
      • Outsourced API Development
      • API Testing Services
      • API Support and Maintenance
      • API Design and Implementation
      • API Consulting Services
      • Third-Party API Integration (including shipping carriers, communication tools, social networks, and payment gateways)

       

      Contacts:

      • Website: www.narolainfotech.com
      • E-mail: inquiry@narolainfotech.com
      • Facebook: www.facebook.com/NarolaInfotech
      • Twitter: x.com/narolainfotech
      • LinkedIn: www.in.linkedin.com/company/narola-infotech
      • Instagram: www.instagram.com/narolainfotech
      • Address: 43519 Wheadon Ter, Chantilly VA 20152 – USA
      • Phone: +1 (650) 209 8400

      Conclusion

      Finding the right API development company can make a big difference in how smoothly your digital tools and systems work together. Whether you’re building a new platform from scratch or need to connect existing services, the companies listed in this article offer a range of expertise to help you get there. They focus on making sure your apps and systems communicate well, stay secure, and grow with your business.

      No matter the size of your project, it’s important to work with a team that understands your goals and can build APIs that fit into your long-term plans. From custom solutions to third-party integrations, these U.S.-based companies bring technical know-how and real-world experience to the table.