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 16,059 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 16,059 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 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
    56 bids

    Looking for a Mentor – QA Automation / .NET Interview Preparation Hi everyone, I have an upcoming technical interview for a Test Automation Engineer (.NET) position and I’m looking for an experienced mentor who could help me prepare in a structured and efficient way. Goal: – structured interview preparation – strong understanding of concepts with practical examples – interview-style questions and mock interview sessions Topics covered in the interview: 1. Test Automation Framework Architecture (.NET) Layered architecture (Core / Business / Tests) Implementing a simple Test Automation Framework Page Object Model, Browser Factory, cross-browser support Integration with third-party tools CI-level parametrization and parallel execution Advanced topics: ...

    $16 / hr Average bid
    $16 / hr Avg Bid
    64 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

    $21 Average bid
    $21 Avg Bid
    15 bids

    Hiring: Lead QA Automation Engineer – IVR / Contact Center (Remote) Key Skill: Hammer Automation (Mandatory) ***If you have strong IVR testing and Hammer experience, we would like to hear from you***** We are looking for an experienced QA Automation Engineer with strong skills in IVR testing and Hammer to connect with one person and connect with him daily helping work Requirements min 5+ years of experience in IVR / Contact Center testing Strong hands-on experience with Hammer (must-have) Experience with Genesys Cloud or similar platforms Manual and Automation Testing experience API Testing (Postman / Rest Assured) SQL for database validation Experience with Azure DevOps / Jira Knowledge of Agile/Scrum methodology Must be willing to coordinate and work closely with anot...

    $9 Average bid
    $9 Avg Bid
    5 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
    55 bids
    REST API JMeter Script
    2 days left
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    I want to work with a Jmeter expert freelancer remotely for few hours this weekend. Im beginer to intermediate level with jmeter. I need a reusable JMX file that will let me stress-test our REST API. The flow is straightforward: first, the script must obtain an OAuth 2.0 access token and keep it available for every subsequent sampler; next, it should hit the file-upload endpoint and push a sample CSV using multipart/form-data. Please capture all correlation values (token, upload IDs, etc.) with regular expressions or JSON extractors so the run can scale with multiple virtual users. The test plan has to be cleanly organised with clear naming, user-defined variables for host, credentials, and file path, and a separate thread group ready for ramp-up tuning. Deliverables • A JMX f...

    $25 Average bid
    $25 Avg Bid
    27 bids

    I’m looking for a Playwright-based framework that automatically exercises our REST and GraphQL endpoints against the staging environment. The goal is a maintainable suite that can be triggered on every build and gives us fast feedback before we promote code to production. Here’s what I need: • Comprehensive Playwright test scripts that cover core flows such as login, key form submissions, and common data-validation scenarios (I’ll provide the exact endpoints and payloads once we start). • A clear way to parameterise base URLs so I can later point the same suite at local or production environments without code changes. • HTML/JSON reports generated after each run and stored in a folder I can archive in the CI pipeline. • Step-by-step documentati...

    $5 / hr Average bid
    $5 / hr Avg Bid
    17 bids

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