API Testing is the process of testing Application Programming Interfaces (APIs) to ensure that they are working correctly and achieving the expected results. APIs are integral for any software applications to communicate with each other, as they provide data exchange and flow of information between different applications. A qualified API Testing Expert can ensure that the communication between applications is secure, and that they meet the performance requirements of the end user.

API Testing Experts make sure to think like an “attacker” while performing API operations, while they expand the boundaries of API inputs to test. This involves traditional testing methods such as boundary value analysis, API workflow validations, boundary conditions and security patch testing. In addition their skills involve overseeing the debugging of API logical codes, assisting in 4GL programming related tools, creating automated API tests & scripts as well as load and stress test API process flows.

Here’s some projects that our API Testing Experts has made real:

  • Creating automated tests for backend services
  • Identifying security loop holes in APIs
  • Debugging API logic codes and component layers
  • Developing customized load tests for optimal performance
  • Integrating third party services via APIs

Overall, a qualified API Testing Expert can provide comprehensive and reliable solution for your application software. These experts can fine tune your application software to ensure that it meets all system requirements and user demands efficiently. By hiring an experienced freelancer from Freelancer.com you can secure superior performance of your application software maintained in perfect condition. We invite you to post your own project on Freelancer.com today and get ready to hire an expert API Tester!

From 16,224 reviews, clients rate our API Testing Experts 4.9 out of 5 stars.
Hire API Testing Experts

API Testing is the process of testing Application Programming Interfaces (APIs) to ensure that they are working correctly and achieving the expected results. APIs are integral for any software applications to communicate with each other, as they provide data exchange and flow of information between different applications. A qualified API Testing Expert can ensure that the communication between applications is secure, and that they meet the performance requirements of the end user.

API Testing Experts make sure to think like an “attacker” while performing API operations, while they expand the boundaries of API inputs to test. This involves traditional testing methods such as boundary value analysis, API workflow validations, boundary conditions and security patch testing. In addition their skills involve overseeing the debugging of API logical codes, assisting in 4GL programming related tools, creating automated API tests & scripts as well as load and stress test API process flows.

Here’s some projects that our API Testing Experts has made real:

  • Creating automated tests for backend services
  • Identifying security loop holes in APIs
  • Debugging API logic codes and component layers
  • Developing customized load tests for optimal performance
  • Integrating third party services via APIs

Overall, a qualified API Testing Expert can provide comprehensive and reliable solution for your application software. These experts can fine tune your application software to ensure that it meets all system requirements and user demands efficiently. By hiring an experienced freelancer from Freelancer.com you can secure superior performance of your application software maintained in perfect condition. We invite you to post your own project on Freelancer.com today and get ready to hire an expert API Tester!

From 16,224 reviews, clients rate our API Testing Experts 4.9 out of 5 stars.
Hire API Testing Experts

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    7 jobs found

    I’m ready to bring in a security specialist to run a thorough, manual penetration test on my live e-commerce application. Automated scanners aren’t enough for this engagement—I need human-driven testing that uncovers real-world attack paths. Here’s what I’m looking for: • A full manual assessment covering all SQL Injection, Cross-site Scripting (XSS) and Cross-site Request Forgery (CSRF),Web Application Penetration Testing , Network Penetration Testing Services External or Internal, Web Services Testing, API Testing • Exploitation-level proof of concept for every confirmed issue, with clear, reproducible steps. • A concise risk-ranked report that separates critical, high, medium and low findings, followed by practical remediation advice writ...

    $119 Average bid
    $119 Avg Bid
    19 bids

    I need end-to-end testing for my web application. The project code is already written, so you will be focusing solely on testing. Requirements: - Thoroughly test on Chrome - Ensure all workflows function as intended - Identify and document any bugs or issues Ideal Skills: - Experience with end-to-end testing tools (e.g., Selenium, Cypress) - Strong attention to detail - Familiarity with web applications and browser testing Please provide a brief overview of your testing experience and any relevant tools you plan to use.

    $10 / hr Average bid
    $10 / hr Avg Bid
    34 bids

    I need an experienced developer to integrate the HaynesPro API into my existing WordPress website. The primary function of this integration will be to provide repair guides and diagnostics. Key Requirements: - Seamless integration of HaynesPro API with WordPress - User-friendly interface for accessing repair guides and diagnostics - Ensure API functionality is reliable and fast Ideal Skills and Experience: - Strong experience with WordPress development - Proven expertise in API integration - Familiarity with HaynesPro API is a plus - Good understanding of creating user-friendly, responsive interfaces Please provide examples of similar work done.

    $1390 Average bid
    $1390 Avg Bid
    232 bids

    QA + Performance Tester Needed: WordPress WooCommerce Website + Flutter Inventory App (API) – Speed Issue Project Summary We have a WordPress + WooCommerce website and a Flutter inventory app connected via API. Both are running very slow and we need a tester to find the exact causes and provide a fix plan. Problems Slow website loading (especially product/shop pages) Heavy product listing/media causing delays Flutter app screens load slowly due to slow/large API responses Search/filter feels laggy What You Need To Do Test key flows (browse, search/filter, cart/checkout on website + inventory flows in app) Measure performance (page speed + API response time + app screen load time) Identify bottlenecks (frontend, plugins, images, server, database, API, app-side) Share a p...

    $4 / hr Average bid
    $4 / hr Avg Bid
    28 bids

    I’m putting together a clean, developer-ready set of API docs for two IPTV panels—XtreamUI and NXT Dash—and I still need reliable, up-to-date material. XUI is already covered on my side, so please focus only on the panels named above and feel free to add any other panel you already have solid references for. What I expect to receive for each panel: • Authentication flow explained step-by-step, including tokens, cookies or keys used • At least one working example request and the full JSON/XML response for the key calls (user login, playlist retrieval, stats, etc.) PDF, Markdown or a Postman/Insomnia collection is fine; clarity is what matters most. I’ll verify by importing your examples and running them against a test server, so the samples need to be com...

    $128 Average bid
    $128 Avg Bid
    57 bids

    More details: What is the primary goal of your performance testing? Check load capacity How many concurrent users should the JMeter scripts simulate? Up to 100 users What types of REST API calls do you need to test? GET requests, POST requests, PUT/DELETE requests

    $20 Average bid
    $20 Avg Bid
    17 bids

    Full Stack Dev Needed: Repair , and Logic and AI Calling Module We are building an AI-powered lead generation platform. The frontend UI is already designed (Lovable), but the backend logic, AI calling flow, and API handshake are not fully wired correctly. We need a senior full-stack developer who can audit, fix, and complete the system so it works end-to-end. This is not a design role. This is implementation + integration. What the Platform Is Supposed to Do: - Super AI Business Search: Search Google Maps / Yelp / Bing, run AI analysis on businesses, generate prioritized leads - Agency Lead Finder: Identify businesses that need web design, SEO, ads, etc. Critical Flow That Must Work: - User must either enter their phone number to receive AI calls OR pay to use the calling feature - S...

    $7 / hr Average bid
    $7 / hr Avg Bid
    53 bids

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