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Ali H.
$10/hr
100% Job Success
Available now
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Ali H. has worked .
⏱ 2,000+ hours billed on Upwork 💰 $10K+ earned across QA projects 🏆 Top Rated with 100% JSS 📱 Manual QA Testing for Web, iOS, Android & Tablets Hi, I’m Ali, a dedicated QA Tester with 3+ years of experience in testing websites, mobile apps (Android & iOS), and digital products. I specialize in manual testing and deliver detailed, actionable reports to ensure your product is bug-free, stable, and user-ready. 🧪 My Expertise Includes: Manual Testing: Functional, Regression, Smoke, Sanity, Exploratory Cross-Browser & Cross-Platform Testing (Desktop, Mobile, Tablet) UI/UX and Visual QA Product & Game Testing Payment Gateway & Database Testing Test Case Creation and Execution API Testing (Postman), SQL Database Testing 🧰 Tools I Use: Jira | Mantis | Bugzilla | Postman | Selenium IDE | Appium | JMeter 💡 Methodologies: Agile | Scrum | Waterfall 🌍 Domains Tested: eCommerce | Gaming | SaaS | Education | Healthcare | Real Estate I approach every project with a user-focused mindset, ensuring smooth functionality and a great user experience across all devices and browsers. ✅ Whether you need end-to-end product testing, mobile app QA, or cross-platform usability evaluation, I’ll provide reliable results, clear documentation, and fast communication to help you deliver a high-quality product. Let’s make your website or app flawless and ready for success! 🚀 Why Work With Me? 🔹 Detail-Oriented Approach – I leave no stone unturned in ensuring software reliability. 🔹 Clear Communication – Daily/weekly reporting with actionable insights. 🔹 Adaptable & Proactive – Thrive in fast-paced environments with tight deadlines. 🔹 Passion for Quality – Committed to delivering products users love. Let’s collaborate to eliminate bugs, optimize performance, and launch flawless software!
Klodian K.
$25/hr
100% Job Success
$1K+ earned
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Klodian K. has worked .
Hello, My name is Klodian and I am a Senior Software QA Engineer with 8 years of professional experience. I specialize in full-cycle QA for Web, Mobile, and Smart TV applications. Throughout my career, I have delivered high-quality software across diverse industries including AI Sales Intelligence, E-commerce, Fintech, CRM, and Video Streaming. I am highly proficient in Agile methodologies and use industry-standard tools like JIRA, Confluence, Qase, and BrowserStack to ensure stable software releases. I believe a tester should be the "voice of the customer." I stay focused on results and proactively suggest UI/UX improvements to enhance the user experience. My approach is "pixel-perfect," collaborating closely with designers and developers to catch edge cases and ensure the highest product standards. Summary of Skills: • Manual Testing: Expert in Functional, Regression, Sanity, and Smoke testing across multiple platforms. • Device Testing: Comprehensive testing on iOS, Android, and Smart TVs including Samsung, Fire TV, and Android TV. • Specialized Testing: Payment gateway integration for Stripe and PayPal, AI predictive model validation, and OTT streaming features. • Documentation: Skilled in creating detailed Test Plans, Test Cases, and Confluence documentation. • Tools: Highly proficient with Jira, Confluence, Qase, ClickUp, BrowserStack, Figma, and GitHub
Oleksandr S.
$20/hr
96% Job Success
$10K+ earned
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Oleksandr S. has worked .
👋 Looking for confidence in your software’s quality? Enhance customer experience and engagement with your app through expert software testing and professional QA engineering! 🏆 With over 8 years of experience as a Manual QA Engineer and QA Tester, I ensure top quality and smooth functionality for both web and mobile applications. Working with me, you will: ★ Stop struggling with a huge number of support tickets ★ Stay confident in your product’s software QA results ★ Save time managing your developers through clear, actionable reports ★ Experience seamless communication and transparent testing updates ★ Avoid costly reputation damage and increase user satisfaction …all while improving your CTR and generating higher revenue $$$ 🌟 I collaborate with startups and growing businesses, helping founders release high-quality products that users love. As a Manual QA Analyst, I help teams: ● Prepare software for release with bug-free applications ● Ensure each feature meets customer expectations ● Set up efficient QA processes and regression testing cycles ● Improve app performance, usability, and overall user satisfaction ● Provide detailed QA documentation and reports for continuous product improvement With a strong background as a Manual Tester and Software QA Engineer, I’ve successfully helped over 10 companies launch and scale products that reached 1,000,000+ unique users per month. 💎 QA Services I provide: ● Functional Testing — Web/Mobile (iOS, Android) ● Usability & UI Testing — from a QA Tester’s perspective to boost engagement ● Cross-Browser Testing (Chrome, Firefox, Safari, Edge, Opera, IE) ● Cross-Platform Testing (Windows OS, macOS) ● Manual Regression and Feature Testing for web and mobile apps ● Broken Link, Spelling & Grammar Testing ● Test Plan creation, Test Scenario writing, Test Data preparation, and Test Case execution By hiring me as your QA Engineer or Manual QA Tester, you gain a reliable partner focused on maintaining your product’s highest possible quality standards 📈 Let’s make your product flawless — message me today and let’s get started! 🔑 Keywords: Quality Assurance, QA, Software Testing, QA Testing, Test Automation, Quality Control, Bug Tracking, Software Quality Assurance, Regression Testing, User Acceptance Testing (UAT), Performance Testing, Test Cases, Test Management, Defect Management, Test Planning, Test Execution, Test Metrics, Agile Testing, Continuous Integration (CI), Test Strategy, Test Reporting, Test Documentation, Test Environment, Test Scripts, Black Box Testing, White Box Testing, Load Testing, Stress Testing, Integration Testing, System Testing, Functional Testing, Non-functional Testing, Usability Testing, Security Testing, Mobile Testing, Web Testing, API Testing, Exploratory Testing, Test Automation Frameworks, Code Coverage, Test Driven Development (TDD), Behavior Driven Development (BDD), Acceptance Criteria, Test Suites, Test Plans, Test Scripts, Test Tools, Quality Standards, Software Development Lifecycle (SDLC), Software Quality Metrics, Quality Improvement, Quality Management, Quality Assessment, Quality Analysis, Quality Engineering, Quality Assurance Process, Quality Assurance Techniques, Quality Assurance Tools, Quality Assurance Best Practices, Quality Assurance Frameworks, Quality Assurance Methodologies, Quality Assurance Guidelines, Quality Assurance Standards, Quality Assurance Training, Quality Assurance Certification, Quality Assurance Audit, Quality Assurance Compliance, Quality Assurance Consultancy, Quality Assurance Reviews, Quality Assurance Documentation, Manual tester, Manual testing, Software tester, Software testing, Tester, Testing, Bug reporter, Bug reporting, Test documentation creato
amatech
Associated with
amatech
$30K+
earned
Nikola A.
$29/hr
100% Job Success
Available now
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Nikola A. has worked .
Before your users find bugs, I do. I'm a Top Rated Plus QA Engineer with 6+ years of experience helping startups and growing companies release stable, high-quality web, mobile, and API applications. - 100% Job Success - Top Rated Plus - 1,700+ Upwork hours worked - 27 successfully completed Upwork projects I've worked on production systems used by thousands of users, including EV charging platforms, payment integrations, fintech products, crypto platforms, SaaS applications, iGaming products, and mobile applications. I don't just execute test cases—I think like your users while reporting like your developers. What I can help you with ✅ Manual Testing • Functional Testing • Regression Testing • Smoke Testing • Exploratory Testing • User Acceptance Testing (UAT) 📱 Web & Mobile Testing • Web Applications • Mobile Apps (iOS & Android) • Cross-Browser Testing • Cross-Device Testing • BrowserStack 🔗 API Testing • REST APIs • Postman • Request/Response Validation • Error Handling • Authentication Testing • Integration Testing 📋 QA Documentation • Test Cases • Test Plans • Regression Suites • Bug Reports • Xray • Jira • Confluence 🗄 Database Validation • SQL Queries • Data Verification • Backend Validation ⚙ Additional Experience • AWS CloudWatch log analysis • Charles Proxy • Figma • Agile / Scrum • Basic Playwright & Cypress automation 💡 What makes me different? Many testers verify that software works. I focus on finding the bugs your customers would discover after release. My goal is not only to report defects, but to help your team release faster with fewer production issues. Every bug report I submit includes: - Clear reproduction steps - Expected vs Actual Result - Screenshots or screen recordings - Environment details - Priority & Severity recommendation Developers appreciate my reports because they're clear, reproducible, and immediately actionable. 🏆 Industries I've Worked In • EV Charging Platforms • FinTech • Payment Systems • Crypto • SaaS • E-commerce • iGaming & Casino • Mobile Applications 🤝 I work well with • Startups preparing for launch • Agile development teams • SaaS companies • Agencies • Product teams • Long-term QA support • Release testing • Regression cycles If you're looking for someone who will thoroughly test your application, communicate clearly with your developers, and help you deliver a polished product to your users, I'd be happy to help. Let's discuss your project.
Karen K.
$10/hr
100% Job Success
$800+ earned
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Karen K. has worked .
Why Hire Me? I focus on a systematic and thorough approach to testing. Instead of just quickly running through basic scenarios, I take the time to understand your product's logic and data flows. This helps me find critical defects and hidden integration issues before the product goes live. How I Work ▪ Deep Dive First: I study your product’s "why" and "how" to ensure testing covers real-world business risks. ▪ Developer-Friendly Reports: Every bug includes high-quality video evidence, clear reproduction steps, and technical logs (Network/Console). Your team fixes issues in minutes, not hours. ▪ Real Devices Only: Testing is performed on physical iOS and Android devices — never emulators. Expertise & Domain Experience • Fintech & Banking: Transaction security, authentication flows, and payment gateway edge cases. • AI & SaaS Platforms: Validating logic flows, response accuracy, and stress-testing backend stability. • E-commerce & Booking: Checkout logic, API integrations, and complex availability algorithms. • Game Testing: Mechanics, UI/UX friction, and in-app purchase validation. Core Stack & Testing Types • Functional Testing: Thorough end-to-end verification of user journeys, business logic, and UI execution. • API Testing: Validating endpoints, response codes, and backend integrations using Postman and Swagger. • Database Testing: Verifying data integrity, state changes, and backend consistency. • Load & Performance Testing: Testing system behavior, response times, and stability under heavy traffic conditions. • Usability & Localization: Ensuring a seamless, intuitive UX across different regions and devices. • Cross-Browser & Cross-Platform: Flawless performance across iOS, Android, and web environments. The Results ▪ 4+ Years Experience: A proven track record from intensive internships to high-stakes freelance projects. ▪ 40+ Critical Bugs Found: Identified high-priority vulnerabilities before they reached end-users, saving both revenue and reputation. ▪ 100% Job Success Score: Consistent delivery and reliability on every project. You get a clean, stable product ready to ship, and a QA partner you don't have to micro-manage. Ready to secure your release? Send me a message, and let’s get to work!
$20/hr
100% Job Success
$50K+ earned
Available now
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Serhiy H. has worked .
I am a passionate QA Engineer with over 6+ years of experience. I am a QA specialist with solid experience in manual testing of desktop applications, mobile platforms (iOS & Android), and backend API services. I help businesses deliver high-quality software by identifying issues early and ensuring functionality, performance, and user experience meet expectations. I have experience with web, API, mobile, and desktop application test automation. I can write test cases, create automation frameworks from scratch, and integrate test execution with CI/CD tools. I have tested applications in the health domain, finance domain, ERP, CRM, hi-tech applications, eCommerce applications, and EdTech applications. I am cloud-enabled, knowledgeable in Docker, Kubernetes, and public clouds such as AWS, GCP, Azure, and hybrid cloud OpenStack. I have strong computer science fundamentals. So no worries. Leave your QA and test automation responsibilities to me. Automation Testing: Automation of API tests, integration tests using Python, PyTest, Java, JUnit, TestNG Test automation of Web UI, API, Mobile App UI using Selenium, Appium, Cypress Creating custom test automation frameworks from scratch, fixing issues in existing frameworks Writing load/performance testing scripts in Python, Shell Penetration test scans for Docker containers, virtual machines, identifying vulnerabilities Manual QA: Test planning, test strategy, writing test cases, test scenarios End-to-end functionality testing, web UI, mobile apps testing API testing, backend testing, database testing using Postman, SoapUI Performance testing and benchmarking using JMeter, LoadRunner Security testing, penetration testing using Nessus, Burp Suite, Nmap Cloud-based, microservices, containerized application testing Tools and Technologies I Have Experience With: Selenium WebDriver, Appium, Cypress Java JUnit, TestNG, Python PyTest Jira for bug lifecycle tracking TestLink for test case management Postman, SoapUI for API testing JMeter, LoadRunner for load testing Shell, Ubuntu, CentOS, and RedHat Jenkins for CI/CD, Ant, Maven, Docker for build
Ahmad G.
$20/hr
100% Job Success
$60K+ earned
Available now
Offers consultations
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Ahmad G. has worked .
I help startups and enterprise teams deliver high-quality software through functional, API, integration, and end-to-end testing. For Upwork, I would avoid opening with a question alone. Instead, use a strong value statement: ✔ 10+ Years of QA Experience ✔ 100% Job Success Score ✔ Top Rated Plus Freelancer ✔ 4,800+ Hours on Upwork ✔ ISTQB Certified QA Engineer ✔ Healthcare, SaaS & Enterprise Application Specialist 💯 Expertise in Web, Mobile, API & End-to-End Testing 🔍 Focused on delivering stable, release-ready applications with strong business workflow validation Healthcare Domain Expertise: • EHR / EMR Systems • HL7 & Healthcare Integrations • Dialysis & Renal Care Applications • Healthcare Billing & Insurance Workflows • Patient Scheduling & Treatment Management • Clinical Data Validation & Reporting • CMS, ICD-10, CPT & HCPCS Validation • Provider & Patient Portal Testing 𝗠𝘆 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀: ▸ Functional & Manual Testing ▸ End-to-End (E2E) & Regression Testing ▸ API & Integration Testing using Postman ▸ Mobile Application Testing (Android/iOS) ▸ Requirement Validation & UAT Testing ▸ Cross-Browser & Cross-Device Testing ▸ Test Case Design & Execution ▸ Defect Reporting & Root Cause Analysis ▸ Release Readiness & Production Validation ▸ AI & Productivity Tools: ChatGPT, Copilot, Claude, Prompt Engineering, AI Output Validation, Test Case Generation, Test Script Drafting I am a Senior QA Engineer with 10+ years of experience testing enterprise web, SaaS, healthcare, and mobile applications. Over the years, I’ve worked closely with developers, project managers, and product owners to ensure software quality across complete release cycles — from requirement analysis to production validation. My expertise includes functional testing, regression testing, integration testing, API validation, backend testing, release readiness, and complex workflow verification. I’ve recently worked extensively on healthcare systems involving EMR/EHR integrations, scheduling workflows, billing systems, backend validations, and business-critical user flows where accuracy and reliability are essential. I’m known for identifying high-impact issues early, improving QA coverage, and helping teams release with confidence. ▸ Backend & Database Validation ▸ Agile/Scrum QA Coordination 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲: ▸ Tools: Postman, Jira, Azure DevOps, Selenium WebDriver, Playwright, TestRail ▸ Automation Exposure: Selenium with C# & Java ▸ Database: SQL Server, Backend Validation ▸ Methodologies: Agile/Scrum, SDLC, STLC ▸ AI-Assisted QA: ChatGPT, Claude, Copilot, Prompt Validation, AI Output Verification 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀 𝗦𝗲𝗿𝘃𝗲𝗱: ▸ Healthcare & EMR/EHR Systems ▸ SaaS & Enterprise Applications ▸ CRM & Billing Platforms ▸ Payment & Workflow Systems ▸ Data Migration & Integration Projects ▸ Media & Cloud-Based Applications Domains Expertise: ▸ eCommerce (Shopify, WooCommerce) ▸ SaaS Applications ▸ Healthcare and Insurance Coverage ▸ Mobile Applications ▸ Banking & Financial Services ▸ Gaming ▸ Point of Sale (POS) ▸ ERP Systems • OpenAI Integration Why Clients Work With Me: ✔️ Strong attention to detail and business workflow understanding ✔️ Comprehensive experience across web and mobile platforms ✔️ Skilled in test documentation, ensuring a structured and repeatable testing process ✔️ Clear, developer-friendly bug reporting ✔️ Ability to quickly understand complex systems ✔️ Ownership mindset with proactive communication ✔️ Experience working in Agile teams and fast-paced releases ✔️ Focus on real user-impact and release stability ✔️ Flexible work hours to meet your project needs ✔️ Expert in crawling websites to ensure flawless functionality and SEO perfection If you’re looking for a QA professional who can go beyond basic testing and help ensure your application is stable, reliable, and release-ready, I’d be glad to support your project. --- 𝗥𝗲𝗹𝗮𝘁𝗲𝗱 𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀: Manual Testing, Functional Testing, API Testing, Integration Testing, SaaS Testing, Healthcare QA, EMR Testing, EHR Testing, Regression Testing, Mobile App Testing, Web Application Testing, End-to-End Testing, Backend Testing, UAT Testing, Release Testing, QA Engineer, Software Tester, Jira, Postman, Selenium, Playwright, Agile QA, Scrum QA, Database Testing, Cross-Browser Testing, Defect Tracking, AI Testing, Prompt Validation, AI-Assisted QA, Healthcare IT, User Acceptance Testing, Software QA, Web Testing, Mobile Testing, Agile, Jira, Test Planning, Test Strategy, SaaS
Nirmal P.
$30/hr
100% Job Success
$400K+ earned
Available now
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Nirmal P. has worked .
I deliver comprehensive Quality Assurance solutions, leveraging 15+ years of full-stack expertise from foundational manual testing to high-speed, AI-powered automation—to ensure rapid, high-quality software releases and efficiency improvements for clients. I transitioned to a 100% freelance capacity after 10 years of full-time employment, offering a proven mix of corporate experience and consulting agility. Core Value : Strategic Quality Engineering Leader | AI-Powered Autonomous Testing & Framework Architecture ** At the core of my current work is the development of Autonomous AI Agents using Playwright MCP (Model Context Protocol) servers. This allows for dynamic, context-aware web automation that moves beyond static selectors to handle complex UI states with minimal human intervention. I complement this with AI-driven API Testing agents and sophisticated workflow orchestration using n8n, ensuring that your entire testing pipeline—from frontend to backend—is intelligent, connected, and highly efficient. **I leverage the full power of Generative AI, including Claude, ChatGPT, and Gemini, to optimize day-to-day testing activities. By implementing Retrieval-Augmented Generation (RAG), I automate the extraction of test requirements from complex documentation and generate high-fidelity synthetic test data. **This "AI-First" approach, combined with my mastery of tools like testRigor, TestSigma & BrowserStack LCA allows me to deliver self-healing test suites that maintain 99% reliability even as your product evolves. ** Modern Web Automation: Over 6 years in automation, including 1+ year of hands-on experience with Playwright (JavaScript & Java) for high-speed, reliable end-to-end tests, alongside established proficiency in Selenium WebDriver (Java & C#), TestNG, and Serenity/Cucumber (BDD). ** Full-Stack Testing: Expertise in automating Mobile Apps (Appium/Java) and APIs (REST Assured, Postman, Karate, JMeter, SoapUI) to achieve high-coverage, shift-left testing across the entire platform. ** Framework Architecture: Expert in analyzing and setting up robust, maintainable frameworks (Keyword-Driven, Data-Driven) tailored to project needs. QA LEADERSHIP, PROCESS & SPECIALIZED RIGOR I ensure robust quality across the entire development lifecycle through strategic planning and deep domain knowledge. ** QA Leadership & Scrum Mastery: Certified Scrum Master (CSM) proficient in managing QA deliverables, estimations, tracking, and leading all Agile/Scrum ceremonies. Proven success in team collaboration and client communication (status reports, sprint planning). ** Documentation & Strategy: Vast experience in delivering core QA artifacts: Test Plans, Test Strategies, Test Case Designing, Test Execution Reports, and Root Cause Analysis (RCA) for maximum organizational clarity. ** Extensive Testing Coverage: Proficient in all critical testing types: Smoke, Sanity, Functional, Integration, Regression, System, UAT, Load/Performance, Compatibility (OS/Browser), and Internationalization. ** Specialized Domain Focus: Dedicated 5 years of experience in WordPress Website Testing and deep domain knowledge across Logistics, Healthcare, E-Commerce, SaaS, and ERP. TECHNICAL STACK & TOOLS ** Defect & Test Management: JIRA (including JIRA-Confluence & JIRA-Zephyr), TestRail, HP-ALM, ClickUp, Trello, Bugzilla, and Redmine. ** CI/CD & Version Control: Jenkins, GitHub, GIT, and Bitbucket. ** Debugging & Utilities: BrowserStack, SelectorsHub, Firebug, and PageSpeed. ** Database: Strong proficiency in SQL for testing and validation across PostgreSQL, MySQL, and MS-SQL. AVAILABILITY & ADMIN ** JIRA Administration: Experienced in setting up JIRA from scratch, including complex workflow and schema configuration. ** Project Management: Includes 3 years of formal project management experience. ** Mentoring: Proven trainer for Agile/Scrum, Manual Testing, and Automation (Selenium, HP-ALM, JIRA). ** Commitment: Highly reliable, multi-tasking, and available 40+ hours per week for long-term partnership.
Usman S.
$35/hr
100% Job Success
$10K+ earned
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Usman S. has worked .
QA Lead & AI Quality Engineer specializing in manual testing, API validation, automation, and RAG/LLM testing. I help startups and product teams increase release confidence, reduce production defects, and deliver reliable software across Web, Mobile, SaaS, and AI-powered applications. I’ve supported enterprise and customer-facing products across fintech, healthcare, insurance, e-commerce, retail, and oil & gas—working closely with developers, product owners, and stakeholders to identify risks early and ensure features are production-ready. What I can help you with Manual & End-to-End Testing - Functional, regression, smoke, integration, and UAT - End-to-end testing for web & mobile - Cross-browser and compatibility testing - API Testing (Validation + Automation) REST API testing using Postman - API validation, test coverage expansion, and structured reporting - QA Automation Selenium + Cypress - Test case automation strategy, stable frameworks, and maintainable suites - QA Planning & Execution Test planning, test strategy, and detailed test case design - Defect management with Jira, Zephyr, and Xray - Agile/Scrum QA processes - AI Testing & Quality Engineering (RAG/LLMs) - LLM application testing and evaluation - AI chatbot & conversational AI testing - Prompt validation, response accuracy, and edge-case coverage - Hallucination and risk-focused testing - AI workflow + API validation - Human-in-the-loop quality evaluation - AI-assisted test scenario generation (Claude, ChatGPT) If you need a hands-on QA Lead to set up or scale your testing process—or deep QA support for AI/RAG features—I can quickly integrate with your team and help you ship with confidence. Message me with your product type (Web/Mobile/SaaS/AI), timeline, and QA gaps—I'll suggest the best testing approach and deliverables.
$27/hr
100% Job Success
$200K+ earned
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Sachin A. has worked .
I help companies test, validate, and improve AI-driven and SaaS platforms before they reach customers. With 15+ years of experience in Quality Engineering, I specialize in testing AI-powered applications, SaaS platforms, APIs, and modern web products to ensure reliability, security, and great user experience. Over the years, I’ve worked with startups and enterprise teams to identify critical issues early, improve product stability, and reduce production risks through structured testing and automation. My Core Expertise AI / LLM Application Testing
 • Prompt behavior validation
 • AI workflow and agent testing
 • Hallucination and edge-case detection
 • Output quality and response validation SaaS & Web Platform Testing
 • Exploratory testing
 • End-to-end workflow validation
 • RBAC / permissions testing
 • Regression and release testing API & Backend Testing
 • REST API validation (Postman)
 • Data verification and edge cases
 • Integration testing Automation & Performance
 • Playwright / Selenium automation
 • Load testing using JMeter
 • CI/CD validation Accessibility & Compliance
 • WCAG / ADA accessibility testing
 • VPAT preparation
 • Usability testing Tools I Use Playwright | Selenium | Postman | JMeter
Git | Jira | Linear | TestRail
BrowserStack | LambdaTest | WAVE | Axe Certifications • ISTQB Certified Tester
 • Certified ScrumMaster (CSM) What Clients Appreciate • Deep exploratory testing skills
 • Clear, developer-friendly bug reports
 • Fast understanding of complex systems
 • Strong ownership of product quality
 • Practical improvement suggestions I particularly enjoy working on AI platforms, SaaS products, developer tools, and complex workflow systems where quality and reliability are critical.