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 20,548 reviews, clients rate our API Testing Experts 4.92 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 20,548 reviews, clients rate our API Testing Experts 4.92 out of 5 stars.
Hire API Testing Experts

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    10 jobs found

    My team and I have taken the “Eyerus ayalkibet” project all the way through initial research, planning, design, development, and an initial testing pass. We now need a fresh set of expert eyes to complete the remaining quality-assurance work. Here’s where things stand: • Core features are in place and stable in staging. • An internal QA round has already surfaced and fixed critical bugs. • We still lack thorough coverage for functionality and user-experience edge cases. What I need from you: 1. Conduct comprehensive functionality testing across all user flows, including sign-up, account management, and core feature interactions. 2. Perform detailed UX testing—look for confusing navigation, inconsistent UI elements, or anything that breaks the user...

    $521 Average bid
    $521 Avg Bid
    40 bids

    I need a seasoned QA professional to run a thorough manual sweep of my entire website. The focus is three-fold: first, verify every user-facing screen for visual or functional defects; second, probe the backend workflows and API responses to be sure data is handled exactly as intended; and third, look for obvious security vulnerabilities—things like broken access control, unprotected endpoints, or input that isn’t being sanitised. All testing will be done from a desktop environment, so please cover the current versions of the major browsers (Chrome, Firefox, Edge, Safari) on Windows or macOS. What I expect from you • A structured test plan outlining the scenarios you will cover before you begin. • Clear, reproducible bug reports with screenshots or short scree...

    $24 / hr Average bid
    $24 / hr Avg Bid
    37 bids

    I need the daily outbound quota of my registered WhatsApp Business API number lifted from the current 100 k ceiling to the maximum tier Meta allows (ideally “unlimited”). The work concerns sending only; incoming traffic is already handled smoothly. The phone number is a single, fully verified WABA line that sits inside an active Meta Business Manager, and we already run approved message templates and signature‐based authentication on every call to /messages. Your task is to analyse our present setup, determine the quickest compliant route to the top-tier limit, and execute the required steps—whether that involves sending the additional quality/volume signals Meta’s system expects, submitting further documents, coordinating with a BSP, or optimising our existing Clo...

    $605 Average bid
    $605 Avg Bid
    57 bids

    I want automation tester . playwright js ts. It's banking client and we can't use any ai tool in system

    $107 Average bid
    $107 Avg Bid
    23 bids

    What I need I need an experienced full-stack developer to help complete and improve SurveyFlow, a land surveying and GIS platform. The system combines a React/Vite web dashboard, FastAPI backend, PostgreSQL/PostGIS database, and Expo/React Native mobile field-survey application. The main goal is to build a reliable workflow for surveyors to collect GPS/GNSS control points in the field, work offline, synchronize data when internet connectivity returns, visualize spatial data on interactive maps, manage surveying projects and documents, and prepare professional survey deliverables. Key work includes reviewing the existing codebase, fixing backend/frontend integration issues, improving PostGIS/GIS functionality, strengthening offline synchronization, improving authentication and permission...

    $612 Average bid
    $612 Avg Bid
    155 bids

    I'm looking for an experienced testers (15 testers) to conduct performance testing on my Chrome extension and post a feedback . Key testing areas: - User interface elements - Background processes Testing environment: - Windows OS (Chrome Browser) Ideal skills and experience: - Experience with Chrome extension testing - Strong understanding of performance testing methodologies - Familiarity with Windows operating system - Detail-oriented with excellent reporting skills Please provide your relevant experience and approach to this task.

    $35 Average bid
    $35 Avg Bid
    30 bids

    I have already built a mobile app with the Kiro AI tool and now need a specialist to get it live on AWS, make sure every user flow works on Android, and iron out any bugs that appear along the way. Here is the flow I have in mind: • Set up the most suitable AWS hosting stack for a production-ready mobile backend (I am open to EC2, Elastic Beanstalk, Lambda or another AWS option you recommend). • Package and deploy the current Kiro AI build, including environment variables, storage and any required IAM roles. • Run thorough Functional testing on the Android version—covering login, navigation, API calls, offline handling, and push notifications. • Log defects, patch them, redeploy, and retest until the build is clean. Deliverables I will use for accep...

    $170 Average bid
    $170 Avg Bid
    102 bids

    Our SaaS web platform is gearing up for several feature releases, and I need a part-time QA specialist who can work fully remote and slot into my weekly sprint cycle without disrupting the team’s rhythm. Your core mandate will be to run thorough functional, regression, and API testing against the latest builds and report findings quickly so fixes can be turned around inside the sprint. Here’s how collaboration will flow: • Each Monday I’ll share the staging URL, release notes, and any relevant Postman collections. • You will execute agreed test cases, explore edge scenarios, and validate all exposed endpoints. • Clear, reproducible defect reports (video or annotated screenshots plus steps to replicate) must be logged in Jira within 24 hours of discove...

    $8 / hr Average bid
    $8 / hr Avg Bid
    49 bids

    Senior QA Engineer Experience Required: 4-6 Years Job Location :- Ahmedabad ( On site ) Working days - 5.5 Weekday (Half day Saturday) Contract Role - Initially 3 to 6 Month. Based on performance it will extend. Role Summary: Ensures delivery quality through comprehensive test planning, execution, automation, and defect management across the software development lifecycle, supporting production-ready releases. Skills Required: Functional testing Automation testing Regression testing API testing Performance testing Test case design and execution Defect tracking and management Quality assurance best practices

    $1054 Average bid
    $1054 Avg Bid
    30 bids
    CodeIgniter REST API Setup
    1 day left
    Verified

    I need a PHP CodeIgniter expert to help with setup, testing and troubleshooting of an existing API. Possible long term working relationship if things go well.

    $40 Average bid
    $40 Avg Bid
    167 bids

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