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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. Compare verified client reviews alongside pricing and capabilities to find the right partner.

How this list is built

We evaluate companies on verified profile data and published client reviews, so you can choose with confidence. We may earn a fee for some placements. How we rank and verify

List of the Best API Development & Integration Agencies

  1. Syed Ahmer Shah logo
    Syed Ahmer Shah
    9 Reviews
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    Syed Ahmer Shah is a Software Engineer and Full-Stack Developer based in Hyderabad, Pakistan , helping startups, growing businesses, and ambitious founders turn ideas into reliable digital products. My work covers custom software, SaaS platforms, web

    Highlights

    $1,000+

    Min Project Size

    $25-49/hr

    Avg Hourly Rate

    2-9

    Employees

    Hyderabad, Sindh, Pk

    Services Provided+27 Services
    10% Software Development Services
    10% Custom Web Application Development
    5% Progressive Web App (PWA) Development
    5% Web App UI Design
    AI Summary

    “No AI summary available for this company yet.”

  2. 3DVUE logo
    3DVUE
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    We empower users to view and personalize their products in 3D online. Our configurator is suitable for different industries, including furniture, fashion, electronics, luxury jewelry, and others. Customers have the ability to tailor every aspect, from components to materials and sizes, before placin

    Highlights

    $1,000+

    Min Project Size

    $50-99/hr

    Avg Hourly Rate

    2-9

    Employees

    Montpellier, Fr

    Services Provided
    100% API Development & Integration
    AI Summary

    “3DVUE offers a versatile 3D product configurator enabling customers across industries to personalize components, materials, and sizes, enhancing engagement and online shopping experiences.”

  3. Jalpi logo
    Jalpi
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    Jalpi is a highly esteemed provider of WhatsApp Business API services located in Ahmedabad, India. We deliver complete solutions for businesses looking to leverage the Official WhatsApp API for their communication requirements. Through our proficiency in integrating the WhatsApp Business API and dev

    Highlights

    10-49

    Employees

    Ahmedabad, Gujarat, In

    Services Provided
    100% API Development & Integration
    AI Summary

    “Jalpi, based in Ahmedabad, India, specializes in WhatsApp Business API integration and chatbot development, enhancing businesses' customer engagement and communication efficiency as an authorized provider.”

  4. Linked API Inc. logo
    Linked API Inc.
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    Ideal for intricate automations, sophisticated outreach, data gathering, and more, there are two Linked API offerings available: 1. **Account API**: This allows you to manage multiple LinkedIn accounts programmatically via a single API interface or to integrate your accounts with other tools and se

    Highlights

    10-49

    Employees

    Services Provided
    100% API Development & Integration
    AI Summary

    “Linked API Inc. provides secure cloud-based APIs enabling programmatic LinkedIn account management and real-time data access, facilitating advanced automation and seamless integration with various business tools.”

  5. Keploy logo
    Keploy
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    Keploy is an open-source testing tool that automatically transforms actual API calls into end-to-end test cases and data mockups. It assists developers in identifying regressions early, minimizes the manual work involved in test creation, and enhances the quality assurance process. By seamlessly int

    Highlights

    10-49

    Employees

    Bengaluru, Karnataka, In

    Services Provided
    100% API Development & Integration
    AI Summary

    “Keploy is an open-source testing tool that automates end-to-end API test case creation, streamlining software testing workflows to improve quality assurance and accelerate development cycles.”

  6. casinoapi solutions logo
    casinoapi solutions
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    CasinoAPI is not just a branding initiative; it's a solution to the complexities of iGaming systems. It's designed to prioritize stability and transparency for operators who appreciate logic over flashy marketing.

    Highlights

    2-9

    Employees

    Limassol, Cy

    Services Provided
    100% API Development & Integration
    AI Summary

    “CasinoAPI Solutions delivers reliable, transparent iGaming system solutions focused on operational stability, emphasizing logic and practicality over marketing-driven approaches for operators.”

  7. Scrapingdog logo
    Scrapingdog
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    At Scrapingdog, we simplify web scraping for everyone. Whether you're gathering data for leads, pricing, research, or other purposes, we're here to help. Scrapingdog manages millions of proxies, browsers, and CAPTCHAs to deliver the HTML of any webpage with just one API call. Our tools are quick, us

    Highlights

    < $25/hr

    Avg Hourly Rate

    2-9

    Employees

    Jaipur, Rajasthan, In

    Services Provided
    100% API Development & Integration
    AI Summary

    “Scrapingdog offers user-friendly web scraping solutions through a single API, managing proxies and CAPTCHAs to deliver webpage data, supporting diverse business data needs efficiently.”

  8. Cosive logo
    Cosive
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    We merge world-class leadership in cyber threat intelligence with technical skills to address your organization’s most difficult security issues.

    Highlights

    $5,000+

    Min Project Size

    $50-99/hr

    Avg Hourly Rate

    10-49

    Employees

    Docklands, Victoria, Au

    Services Provided
    100% API Development & Integration
    AI Summary

    “Cosive combines expert cyber threat intelligence and advanced technical skills to tackle complex security challenges, providing comprehensive solutions for organizational cybersecurity needs.”

  9. Orbit Systems Ltd logo
    Orbit Systems Ltd
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    Orbit Systems delivers a high-performance, headless pricing infrastructure specifically designed for B2B WooCommerce stores. As WooCommerce grows, complicated pricing rules—such as tiered quantity discounts, customer-specific contracts, and overlapping category promotions—can become significant perf

    Highlights

    London, England, Gb

    Services Provided
    100% API Development & Integration
    AI Summary

    “Orbit Systems offers a headless, high-performance pricing infrastructure for B2B WooCommerce stores, delivering fast, complex pricing calculations via API for seamless and scalable e-commerce experiences.”

  10. RiverAPI logo
    RiverAPI
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    RiverAPI offers contemporary API development and integration services from its headquarters in London. We assist businesses in designing, building, and maintaining APIs that enhance growth, security, and efficiency. Our emphasis is on developing solutions that are practical, well-documented, and sca

    Highlights

    10-49

    Employees

    London, England, Gb

    Services Provided
    100% API Development & Integration
    AI Summary

    “RiverAPI specializes in designing, building, and maintaining scalable, secure APIs for mid-size and large enterprises, delivering practical, well-documented solutions with measurable business value.”

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Buyer's guide

Hiring API Development & Integration companies

What the work covers, how to judge a partner and what drives the price.

What API development and integration companies deliver

Good API work starts with the contract: an OpenAPI or GraphQL schema agreed before code, covering resources, error formats, pagination and versioning. Builds are typically in Node.js, Java, .NET, Python or Go, secured with OAuth 2.0, scoped API keys or signed tokens, and placed behind a gateway such as AWS API Gateway, Kong or Apigee for rate limiting and analytics. Deliverables include reference documentation, a developer portal or SDKs for partner APIs, and automated contract and load tests.

Integration projects add data mapping between systems, webhooks and message queues, retry logic and idempotency so a failed call never creates duplicate orders, and monitoring that alerts when a connection breaks. Some firms build on an integration platform such as MuleSoft or Boomi instead of custom code.

Engagements are fixed-scope integrations, API platform builds, ongoing maintenance retainers that keep connections working as vendors change their APIs, and dedicated developers.

Chapter 1 of 3
FAQ

API Development & Integration FAQs

Short answers to what buyers ask before hiring a API Development & Integration company.

Question not covered? Ask our team

An API development and integration company designs and builds APIs that expose a product's data and functions, and connects existing software through their APIs. It writes the API specification, builds and secures endpoints, maps data between systems, handles errors and retries, documents everything and monitors integrations in production.

Cost depends on the number of systems, documentation quality, data transformation, real-time requirements and compliance needs. Single integrations are often fixed-price, while platform builds run on time and materials. Most firms in this listing set minimum projects of $1,000 to $10,000, and enterprise specialists start at $50,000.

API development focuses on the interface other software uses: endpoints, contracts, authentication, versioning and documentation. Backend development covers the whole server side, including business logic, databases and background jobs, of which the API is one layer. Integration work goes further, connecting your systems to outside ones.

Length depends on how many systems are involved and how quickly sandbox access and credentials arrive. The phases are discovery and data mapping, API specification, build, testing against sandboxes, security review, cutover and monitoring. Slow vendor approvals, missing test environments and undocumented legacy systems cause most delays.

Firms in this listing most often work for information technology, ecommerce, healthcare, financial services, business services, education and real estate clients. Healthcare integrations rely on HL7 and FHIR standards, financial services on open banking and payment APIs, and ecommerce on marketplace, shipping and inventory connections.

The largest groups of API development companies on this page are in Ahmedabad, London, Lahore, Surat and Bengaluru, with Warsaw and Pune also strong. Time-zone overlap matters for integration work, because debugging a live connection often needs both teams online at once.

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