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 17,861 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 17,861 reviews, clients rate our API Testing Experts 4.91 out of 5 stars.
Hire API Testing Experts

Filter

My recent searches
Filter by:
Budget
to
to
to
Type
Skills
Languages
    Job State
    10 jobs found

    I am looking for someone who can perform functional testing of the user-login and authentication flow, test the place findings into reports. Deliverables • A concise test plan outlining scenarios and edge cases you covered • A defect log with reproducible steps, screenshots or screen recordings, and severity tags • A final summary report highlighting pass/fail rates, critical blockers, and quick-win recommendations I’ll provide credentials, staging URLs, and any clarifications once we kick off.

    $114 Average bid
    $114 Avg Bid
    36 bids

    Job Description:
 We’re looking for a skilled and detail-oriented QA tester based in China to help us test the API functionality of our payin and payout systems. You will play a key role in validating the reliability and accuracy of our payment processes, ensuring everything runs smoothly from start to finish. Scope of Work: * Conduct end-to-end testing of API-based payin and payout transactions * Monitor and record the full transaction process, including responses and behavior at each stage * Identify and report bugs or unexpected results with clear documentation * Work closely with developers to replicate issues and verify fixes * Offer suggestions to improve testing coverage and process reliability Requirements: * Must be physically located in China (for regional payment flow t...

    $203 Average bid
    $203 Avg Bid
    17 bids

    I’m looking for a seasoned manual tester to put our customer-facing web application through its paces. Your focus will be on functional, usability, and compatibility coverage while validating data accuracy with targeted SQL queries against the live database. Here’s the flow I have in mind: build concise test cases, execute them across modern browsers, and log each defect in Jira with crystal-clear steps to reproduce, expected vs. actual results, screenshots or video, and any supporting SQL evidence. An analytical eye that spots edge-case failures is more important than sheer speed. When you respond, highlight previous web-application projects you’ve tested, the databases you queried with SQL, and any QA toolchain you rely on—those real-world examples help me gauge...

    $13 / hr Average bid
    $13 / hr Avg Bid
    44 bids

    Job Description:
 We’re looking for a skilled and detail-oriented QA tester based in Nigeria to help us test the API functionality of our payin and payout systems. You will play a key role in validating the reliability and accuracy of our payment processes, ensuring everything runs smoothly from start to finish. Scope of Work: * Conduct end-to-end testing of API-based payin and payout transactions * Monitor and record the full transaction process, including responses and behavior at each stage * Identify and report bugs or unexpected results with clear documentation * Work closely with developers to replicate issues and verify fixes * Offer suggestions to improve testing coverage and process reliability Requirements: * Must be physically located in Nigeria (for regional payment fl...

    $34 Average bid
    $34 Avg Bid
    16 bids

    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...

    $187 Average bid
    $187 Avg Bid
    28 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...

    $27 / hr Average bid
    $27 / 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...

    $35 Average bid
    $35 Avg Bid
    56 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...

    $481 Average bid
    $481 Avg Bid
    141 bids
    QA Lead / Automation Engineer
    18 hours 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 ...

    $359 Average bid
    $359 Avg Bid
    27 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.

    $189 Average bid
    $189 Avg Bid
    78 bids

    Recommended Articles Just for You