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 15,894 reviews, clients rate our API Testing Experts 4.91 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 15,894 reviews, clients rate our API Testing Experts 4.91 out of 5 stars.
Hire API Testing Experts

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    11 jobs found

    Important - QA Tester locations that we are looking for: Germany, Cyprus, Colombia and Nepal. Tester location should be located in one of the location described above (Without VPN or other services) We are looking for a detail-oriented QA tester to help us test an iGaming platform. Your role will be to follow provided instructions, complete a set of actions (registration, login, deposit, basic functionality checks), and record your screen during the process. Responsibilities: - Follow the provided test plan step by step - Test user registration, login, and deposit flows - Record your screen while testing - Report any bugs, errors, or unusual behavior with screenshots and notes Requirements: - Reliable internet connection - Ability to record your screen (desktop or mobile) - Good attenti...

    $135 Average bid
    $135 Avg Bid
    27 bids

    I have wired together an applicant-tracking workflow that starts in N8N, hands data to JazzHR, and finishes by sending candidates real-time SMS updates through Twilio. Now I need fresh eyes to run full end-to-end tests so I can be certain every piece works exactly as intended before we put it in front of real applicants. Here is what needs to happen: • Walk through the entire candidate journey—from application submission, through interview scheduling, to each notification trigger—just as a real user would. • Confirm that data created in one step is accurately passed between N8N, JazzHR, and Twilio, and that no records are dropped or duplicated along the way. • Verify every system response: status updates in JazzHR, webhook calls in N8N, and outbound SMS fro...

    $141 Average bid
    $141 Avg Bid
    132 bids

    Tingum is a mobile marketplace platform connecting clients with local taskers (similar to TaskRabbit). Users can post jobs, hire taskers, handle payments via wallet/escrow, approve materials, and complete jobs. Our website is a simple landing page that directs users to download our mobile app (iOS/Android). All marketplace functionality lives in the mobile app, which consumes our backend API. We are a small team with a working MVP. The backend is 90% complete. We need an experienced backend developer to finish the remaining critical API endpoints and database logic so our mobile app developer can complete the app. SCOPE OF WORK - COMPLETE BACKEND COMPLETION: PHASE 1 - CRITICAL FIXES: 1. Escrow Release API - Create endpoint POST /api/jobs/release-escrow to transfer funds from job escrow...

    $19 / hr Average bid
    $19 / hr Avg Bid
    147 bids

    I need a fresh, systematic look at my SaaS web application so I can release the next build with confidence. The immediate focus is on two areas: • Functionality – please design and run solid unit tests against the existing code-base. I expect clear, reproducible test cases, the exact assertions you use, and a concise report of any defects or edge-case weaknesses you uncover. • Usability – I want the interface and flow to feel intuitive to first-time users. Conduct a practical user-interface evaluation and navigational walk-through, noting confusing labels, inconsistent behaviours, dead ends, or extra clicks that slow someone down. Annotated screenshots or screen-recordings alongside your written feedback will help me act on your findings quickly. You will have acc...

    $25 Average bid
    $25 Avg Bid
    55 bids

    Mow Ops Accounting Integration Brief Purpose Engage a third-party tester to validate the invoice and payment flows between Mow Ops and the connected accounting platforms: MYOB, Xero, and Intuit (QuickBooks Online). Test Environment Mow Ops: Pro developer account SMS: Disabled Accounting systems: Trial or demo account for each of MYOB, Xero, and Intuit Out of scope: Tap To Pay Pre application note. If you have questions ask them in your proposal Prices submitted are not for negotiations the brief is clear. if you wish to change offer post proposal then offer will be rejected, not here to spend 5 hours discussing a clear connie breif. Provider will be give an account to review but the demo account is available now, for those that want to view before proposal. will be awarded in 11:00 AWST ...

    $105 Average bid
    $105 Avg Bid
    43 bids

    We’re looking for an experienced Meta/WAB developer to set up our WA Business Cloud API from scratch, including Business Manager verification and full API readiness. This is a hands-on implementation role, not consulting — we want someone who has done this before and can execute end-to-end including all verifications processes. By the end of this project, we should have a fully functional WA Cloud API setup, with all credentials ready to plug into our ERP system and successfully send/receive messages. You will be responsible for: • Creating and verifying our Facebook Business Manager • Creating and configuring a Meta App with WA Cloud API Setting up: • App ID & App Secret • System User • Long-lived Access Token • Creating and linking a WABA...

    $338 Average bid
    $338 Avg Bid
    143 bids
    Web App QA Testing
    17 hours left

    I need a seasoned QA specialist to put my web application through its paces, concentrating on two core areas: overall functionality and the user interface. All testing must be carried out in Google Chrome, as that is where the bulk of my users will interact with the product. If you spot issues that only appear in other browsers, you’re free to note them, but Chrome is the primary focus. The job covers everything from validating key user flows and edge-case scenarios to making sure the layout, styling, and on-screen messages look and behave exactly as intended. I will provide access credentials, a short onboarding guide, and any additional assets you might need. Deliverables I expect: • A concise test plan outlining the scenarios you covered • A detailed bug report (in...

    $6 / hr Average bid
    $6 / hr Avg Bid
    74 bids

    I need an expert to stand up the full SMS and messaging setup inside my existing Twilio account and then stitch it together with a WhatsApp Business API connection handled through 360dialog. Here is what I want to walk away with: • A correctly configured Twilio Messaging Service (numbers, sender IDs, compliance rules) that can send and receive SMS. • A live 360dialog WhatsApp Business API instance tied to the same customer database, ready for production traffic. • Clean API wiring so my app can decide: send on WhatsApp first and, if the user is unreachable, fall back to Twilio SMS. • Sample code and clear documentation that show how to trigger messages, parse incoming webhooks, and monitor delivery. If you have done a dual-channel rollout like this before, ...

    $132 Average bid
    $132 Avg Bid
    93 bids
    QA Lead / Automation Engineer
    4 days left
    Verified

    We are seeking a QA Lead / Automation Engineer with 5–7 years of experience to drive test strategy, automation frameworks, and quality assurance activities for Appian-based applications. The role involves defining QA strategy and test planning, building and maintaining automation frameworks, performing API and integration testing, executing regression and automation test suites, and collaborating with DevOps teams for CI/CD integration. The QA Lead will also track defects, ensure timely resolution, lead QA reporting, and uphold quality governance across projects. Candidates should have strong automation testing experience, expertise in Selenium and/or FitNesse, API testing knowledge, CI/CD integration experience, and excellent analytical and communication skills. This is a 3-month ...

    $253 Average bid
    $253 Avg Bid
    26 bids

    Preciso de um desenvolvedor com experiência comprovada na API oficial do iFood. Já possuo um ERP próprio em PHP + MySQL. Preciso de acesso/configuração da API para integrar meu ERP ao iFood. Objetivos: - Enviar produtos do meu ERP para o cardápio do iFood - Atualizar preços dos produtos no iFood pelo ERP - Controlar disponibilidade/estoque dos produtos no iFood - Receber pedidos automaticamente no ERP - Obter detalhes dos itens vendidos - Atualizar status dos pedidos Importante: não preciso que desenvolva meu ERP. Preciso de alguém com experiência real na API do iFood para viabilizar acesso, credenciais, webhooks e orientação técnica.

    $133 Average bid
    $133 Avg Bid
    78 bids

    Necesito poner en marcha una app catcher de pruebas funcionales completamente automatizadas para mi aplicación y quiero que la ejecución sea lo más ágil posible, prácticamente en milisegundos. El proyecto consiste en desarrollar un script ―o la solución que consideres óptima― capaz de lanzar, validar y reportar pruebas funcionales de forma fiable. No estoy casado con herramientas concretas como Selenium, Appium o Cypress; si crees que otra tecnología, framework o lenguaje es más adecuado para conseguir la mejor velocidad y estabilidad, adelante. Entrego casos de uso claramente definidos, datos de prueba y acceso al entorno de staging. Espero, a cambio: si puede mejor Api que es mas rápido, el objetivo 1 es dar GO Y...

    $95 Average bid
    $95 Avg Bid
    32 bids

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