Senior QA + Debugging Expert for Full Website Test & Fix Before Production Launch

@ZohaibRoy

⭐⭐⭐⭐⭐ Expert QA and Bug Fixing for Your Web Application Launch ❇️ Hi My Friend, I hope you're doing well. I’ve reviewed your project details and see you are looking for a senior QA professional. You don’t need to look any further; Zohaib is here to help you! My team has successfully completed 50+ similar projects for web application testing and bug fixing. I will methodically test your application, report findings clearly, and fix any issues directly in the codebase. ➡️ Why Me? I can easily manage your QA and bug-fixing needs as I have 5 years of experience in software testing and debugging. My expertise includes functional testing, test planning, and payment flow testing. I also have a strong grip on Python and JavaScript, which allows me to understand and fix issues effectively. ➡️ Let's have a quick chat to discuss your project in detail. I can provide samples of my previous work, showcasing my QA expertise. Looking forward to our discussion! ➡️ Skills & Experience: ✅ Software Testing ✅ Bug Reporting ✅ Test Planning ✅ Functional Testing ✅ Payment Integration Testing ✅ Debugging ✅ Python Development ✅ JavaScript Development ✅ PostgreSQL Knowledge ✅ Cross-Browser Testing ✅ Error Handling ✅ Attention to Detail Waiting for your response! Best Regards, Zohaib

@Microlent

Hello, Your requirement goes beyond traditional QA, and that's exactly the kind of engagement I enjoy. I can take ownership of both the testing process and the debugging that follows, ensuring your application is launch-ready rather than just generating a list of issues. My approach begins with a detailed test plan covering authentication, dashboard workflows, payment processing, permissions, edge cases, API validation, browser compatibility, and security-related scenarios. Every issue will be documented with clear reproduction steps, severity, screenshots, logs, and suspected root cause to streamline the fixing process. For Stripe testing, I validate successful and failed payments, 3D Secure authentication, refunds, duplicate submissions, webhook delivery, idempotency, and backend event processing to ensure the database and application state remain consistent. After approval of the bug report, I'll debug both the JavaScript frontend and Python backend, implement clean fixes with proper validation and error handling, re-test each issue, and provide a final verification report with root cause analysis and results. Based on the scope, I estimate 6–8 working days, depending on the number and complexity of issues discovered. I'm ready to start immediately and work milestone-wise as proposed. Looking forward to discussing the project.

@kamran2012

Hi, I will deliver the full test plan, structured bug report, and all fixes — covering auth flows, dashboard CRUD, and Stripe checkout/webhooks — with clear commits and root-cause notes for each issue. For payment testing, I will trace each Stripe webhook event through your Python backend to confirm the handler processes every edge case (declined cards, 3-D Secure callbacks, duplicate events) at the database level — not just the front-end response. Questions: 1) Which issue tracker do you prefer for the bug report — Google Sheet, GitHub Issues, or another tool? 2) Are the Stripe webhooks using a signing secret for verification on staging? Looking forward to talking through the details. Kamran

@offshore9006

This BID is for Milestone 1; for Milestone 2, we will allocate a Sr. Python_JS developer. We have executed multiple Testing assignments; some of them via Freelancer. Please find attached the following for your reference. https://www.freelancer.com/projects/testing-qa/test-mobile-app-certain-change/ https://www.freelancer.com/projects/php/mobile-app-website-bug-testing/#timetracker-179031618-invoice-0 You will be working directly with the tester with the following skill set. have 7+ years of testing experience with Certification. Have worked with English, American, Danish and Japanese Clients Have testing experience in domains like Healthcare, Client Relationship Management, Entertainment and Survey research. Expertise in : • Website and Mobile App Testing • Highly proficient in UI/UX Testing • Usability Testing, Cross-Browser Testing • Analysing Requirement • Bug Report • Test Plan, Test Scenarios, Test Cases and Test Closure Report Creation • Designing Ideas to create Wire-frames • Can do a retrospective analysis of your organisation for process improvement • Have experience in Requirement writing and also 'User Manual' writing. • Working Knowledge of - HTLM, CSS, JavaScript, and Selenium. - Thanks, Raman

@tadinhkien

Greetings, Thank you for considering my application for this project. As an AI Engineer and Python Developer with over 8+ years of experience, I bring a wealth of knowledge and expertise in the field of Python, Deep Learning. I have carefully reviewed the project description and am eager to discuss your specific needs and requirements in more detail. My commitment is to provide dedicated support and consistent follow-up throughout the project's lifecycle. Please feel free to reach out to me to further discuss how I can contribute to the success of your project. Looking forward to the opportunity of working together. Best regards, KuroKien

@pauldinhdev

Hi, This is Paul from Canada. I understand you need someone who can do both sides of the job: QA testing and bug fixing. The focus is validating user registration/authentication, dashboard workflows, Stripe Checkout, Stripe webhooks, role/permission access, session handling, CRUD operations, cross-browser testing, negative testing, and production readiness. I have experience working with Python REST APIs, JavaScript applications, PostgreSQL, Stripe payments, webhook processing, Linux environments, QA testing, bug tracking, root-cause analysis, and regression testing. I don't just report issues-I debug and fix them in the codebase, then re-test to confirm resolution. My approach is straightforward: create a test plan, perform end-to-end testing, verify Stripe payment flows (successful payments, declined cards, 3D Secure, refunds, webhooks), document issues with severity and reproduction steps, fix confirmed bugs, improve validation/error handling, and complete a final regression pass before launch. Question: Which Python framework is used on the backend (Django, FastAPI, Flask, or another framework)? I can start immediately and handle both the QA process and the fixes through to launch. Best regards, Paul Dinh

@Muhammadzeesha59

Hello Sir/MAM I am a skilled full stack developer. Having rich experience in Java , C++ , C , C# , Python , Eclipse , Sql , Mysql , .Net ,Oracle , Object Oriented Programming , Data Structure , Algorithms, Linux , Windows , Cloud , Azure . I have a perfect grip on “Artificial Intelligence” “Automation” , and work in “Machine Learning” Deep Learning ”. My track record as demonstrated in my 100% job completion and 5-star review rating showcases My ability to deliver exceptional results on time and with utmost quality I believe that my skill set makes me the ideal candidate for this project Please come on chat we will discuss more about this I will be waiting for your reply . Thanks and Best Regards

@quan9824

Hi, I can own both the QA process and the bug-fixing phase for your pre-launch web application. I have experience testing and debugging production-ready web apps with Python REST backends, JavaScript frontends, PostgreSQL, authentication flows, dashboards, role permissions, and Stripe checkout/webhooks. My approach is methodical: define coverage first, test critical flows end-to-end, document bugs clearly with evidence, then fix root causes in the codebase and retest until blockers are cleared. For payment testing, I would verify the full Stripe flow, not only the frontend success screen: successful payments, declined cards, 3-D Secure, duplicate submissions, refunds, webhook signatures/events, backend state changes, database records, and failure/retry handling. Deliverables would include: Short test plan/checklist before testing Structured bug report with severity, repro steps, screenshots/videos, expected vs actual, and suspected cause Clean frontend/backend fixes with clear commits Root-cause notes for each fix Retest confirmation for every resolved issue Final launch-readiness report I’m comfortable working independently with staging URLs, test accounts, Stripe test keys, repo access, and logs. I can test across Chrome, Firefox, Safari, Edge, and mobile/tablet/desktop breakpoints. I’m comfortable with your two-milestone structure and can start immediately.

@PINESCRIPTERR

Hi, Thank you for the detailed brief. We've reviewed the full scope and have a clear understanding of the objective: owning the complete QA and bug-fixing cycle for your web app before launch, covering authentication, dashboard, and Stripe payment flows, with structured bug reporting and clean code fixes delivered through two clear milestones. We particularly appreciate the milestone-based payment structure. In our view, the most critical area to test thoroughly is the Stripe webhook handling, since the front-end success screen passing is not sufficient proof that backend payment events are being processed and recorded correctly. Based on the information provided, we can cover a short test plan delivered upfront for agreement, full functional and negative testing across all three critical areas, cross-browser and cross-device coverage, a structured bug report with severity ratings and reproduction steps, root cause fixes in both Python and JavaScript with clear commits, and a final re-test report confirming all critical and major issues pass before launch. Kind regards, Houssame

@mobimubasir

I do both: recent Django+React SaaS where I wrote the QA plan, logged engineer-level bugs with root cause, then shipped Python/JS fixes and re-tested. Also tested Stripe Checkout + webhooks end-to-end, caught signature/idempotency issues and patched backend to prevent false “paid” states. For your app: 2-3 days for test plan + structured bug report across auth, dashboard, payments on all browsers/devices, then 3-5 days to fix + clean re-test. Milestone 1 = report, Milestone 2 = all fixes passing.

@mayankinnovative

Hello, I reviewed your Senior QA + Debugging Expert project and can help perform a complete end-to-end audit of your website With extensive experience in web application testing, debugging, API validation, database troubleshooting, frontend/backend analysis, and production readiness reviews, I focus on finding root causes—not just symptoms. I can help with: • Complete website QA testing • Functional and regression testing • Bug identification and fixing • Frontend and backend debugging • API testing and validation • Database and workflow verification • Mobile responsiveness testing • Cross-browser compatibility testing • Performance optimization • Security and vulnerability checks • Production launch readiness review My approach: • Review the complete application workflow • Test every feature and user journey • Document and prioritize issues • Fix critical bugs and inconsistencies • Verify all fixes through retesting • Deliver a production-ready system with detailed reporting Technical expertise: • PHP / Laravel • Node.js • React.js • JavaScript • MySQL / PostgreSQL • REST APIs • Selenium • Postman • Chrome DevTools A few questions: • What technology stack is the website built on? • Is the project already feature-complete? • Do you have an existing bug list or should I perform a fresh audit? • What is your expected production launch timeline? Thanks

@muneeb6767

I can handle full QA + debugging of your Python/JS/Stripe stack, covering auth, dashboard, payments, and webhook flows with structured test plans and severity-based bug reporting. I’ll reproduce issues from logs/network traces, fix root causes in both frontend and backend, and deliver clean commits with verified re-tests. Estimated timeline is ~5–10 days depending on bug volume, starting immediately with a full QA checklist

@Elexoft

Hi, greetings! I’d be happy to help you with the QA testing and bug fixing of your web application before launch. I’ve carefully read your project description and would love to learn more about your application and current testing status. Here’s how I typically work: 1. I review the application and create a test checklist 2. I test all critical flows and report issues 3. I fix confirmed bugs and re-test everything I have over 16 years of experience and have worked on web applications involving user authentication, dashboards, payment systems, APIs and database-driven platforms. I am comfortable working with Python backends, JavaScript front ends and PostgreSQL databases. For payment testing I will verify successful payments, failed transactions, 3D Secure flows, refunds and webhook processing to ensure the backend handles every Stripe event correctly and not just the front-end response. I understand the importance of structured bug reporting and root cause analysis. Every issue will be documented with clear reproduction steps, severity level, screenshots and fix notes. After fixes are completed I will perform a full re-test to confirm all Critical and Major issues are resolved. Please feel free to get back to me so we can discuss your project and begin right away. Thank you for your time.

@talkwaqar

Two things in your brief tell me you've been burned before: you want webhook handling verified on the backend (not just the front-end success screen), and you want root causes fixed, not surface patches. That's exactly how I work. I'd start milestone one with a short test plan we agree on before I touch a thing. My relevant experience: I built and ran QA on a multi-org SaaS platform with Stripe checkout and webhooks, where the hard bugs were always server-side. Things like a webhook processed twice flipping a subscription state, or a 3-D Secure flow that succeeded on screen but never confirmed the payment intent on the backend. I both found those and fixed them in the Python/JS code, so I'm comfortable owning the full loop you described. My approach to the payment-flow testing: 1. Test against real Stripe test events, not just the UI. I trigger declined cards, 3-D Secure, and refunds, then confirm the backend state matches by reading the logs and the database, not the success page. 2. Replay and duplicate webhooks to check idempotency and signature verification, so a retried event can't double-charge or corrupt a record. 3. Force the mismatch cases: payment succeeds but webhook is delayed or fails, and confirm the app reconciles correctly instead of silently leaving an account in the wrong state. I'd run the same engineer-grade reporting across auth, dashboard, and the negative/boundary cases you listed (direct-URL access to protected pages, expired sessions, duplicate submissions, console and 4xx/5xx checks). Estimate: 7 days, split across your two milestones. 1. Days 1 to 4: test plan, then the full structured bug report with severities, repro steps, screenshots, and suspected cause per bug. 2. Days 5 to 7: fix every confirmed Critical and Major in the repo with clean per-fix commits, add validation/error handling where the bug class can recur, then a clean second pass. Done = every Critical and Major item re-tested and marked passing in the report before launch, with a one to two line root-cause note on each fix. One question so I can size milestone one accurately: roughly how many distinct dashboard CRUD screens and user roles am I covering, two or three roles, or more? P.S. The most common Stripe launch bug I find isn't in the payment, it's the webhook endpoint returning 200 before the handler finishes, so Stripe stops retrying and you lose the event on a timeout. I'll check that first. Waqar

@dailytechworks

Hello, I'm Rudra Kumar, your Senior QA Engineer and Scrum Master with a knack for meticulous website testing. I've successfully led quality assurance efforts in complex arenas similar to yours: SaaS, E-commerce, and Fintech, amongst others. In fact, I believe my experience with payment gateways and webhooks will be especially valuable for your project. Cross-browser and OS tests? Integral part of both my mobile-related work and day-to-day life(acre). Thanks to having worked end-to-end within the Software Testing Life Cycle, using tools like Jira with multiple databases including PostgreSQL, your project's requirements are securely within my purview. Being comfortable reading Python + JavaScript code is second-nature to me which makes me an excellent fit for not just understanding your codebase but fixing any bugs found during the process. Each issue will be treated as in-depth puzzle: I'll identify its root cause, apply a clean fix eliminating surface-level patches, implement robust preventative measures into the system so that the same kind of issue isn't repeated-going forward and finish it off with a concise note on what was done. My work is on your success: enabling you to launch a web application with minimum defects along with a complete structure bug report showcasing all issues sorted based on their severity plus roots fixed and lastly an app thoroughly compatibility checked.

@kantshashi1999

Hey there Full stack developer with 6+ years of expereince here. I can help to QA and bug fix any issues find, I will also run AI agent parallely to double test things and also letting AI to search for issues on the platform. I am confortable with python and javascript. I will also share detailed reports on QA and bug fixes. DM me to discuss more

@ukokab

I am a Senior QA Engineer with 10+ years of experience in software testing, automation, debugging, and quality assurance. I started my IT career in analytics and SEO, which helped me develop strong analytical and problem-solving skills. Since 2015, I have worked extensively in Manual QA, Test Automation (Selenium with Java, Playwright, Cypress), API testing, database validation, and production issue investigation. For your project, I will first create a detailed test plan covering authentication, dashboard functionality, Stripe payments, webhooks, permissions, negative scenarios, browser compatibility, and API validations. I thoroughly investigate console logs, network traffic, backend logs, and database records to identify root causes rather than applying temporary fixes. I am comfortable working with Python backends, JavaScript frontends, REST APIs, PostgreSQL databases, and Linux environments. I also have experience validating payment workflows, webhook processing, and regression testing after fixes. I can start immediately and work independently while providing clear, structured reports and clean code fixes. Best, Usman K. https://www.freelancer.com/u/ukokab

@carlosd178

Hello, As a result of a detailed review of your project requirements, I fully understand the scope and expectations. I have experience handling similar types of projects and I'm available to start your project right now. I bring deep expertise in Python, JavaScript, Software Testing, Website Testing, Quality Engineering, REST APIs, PostgreSQL, Stripe Integration, and Web Application Development with over 10 years of experience. One of the key challenges in projects like this is not only identifying defects but tracing them to the root cause and delivering stable fixes without introducing regressions. For payment-flow testing, I will validate successful payments, declined cards, 3D Secure authentication, refunds, webhook delivery, retry scenarios, and backend event processing to ensure data consistency beyond the checkout UI. Estimated timeline: • Test Plan & Full QA Report: 2–3 days • Bug Fixes & Clean Re-test: 3–5 days (depending on issue volume) I have a couple of quick questions. • Do you currently have automated tests, or is the application relying entirely on manual QA? • Approximately how many user roles and permission levels are implemented in the system? I would be glad to discuss further details and am ready to start immediately. Looking forward to hearing from you. Best regards, Carlos.

@FizzaNadeemK

Hi, I can take full ownership of QA and debugging across your Python API, JavaScript frontend, PostgreSQL stack, and Stripe-based payment flows to get the system production-ready without regressions. I saw you need structured test planning, deep functional + negative testing across auth, dashboard, and webhook-driven payments, plus direct code-level fixes with clean commits and revalidation, and I’ve worked on full-stack systems where I handled both QA reporting and backend/frontend bug resolution end-to-end in staging environments. My approach is to start with a risk-based test matrix focusing first on auth/session integrity and Stripe webhook reliability, then systematically reproduce and isolate issues with logs, console traces, and API responses before implementing root-cause fixes and re-testing each critical path. For payment flow testing, I validate the full Stripe lifecycle including 3DS, failed charges, webhook retries, idempotency handling, and backend reconciliation between Stripe events and database state rather than relying on frontend success screens. Can you confirm whether your Stripe webhooks already have idempotency keys and event deduplication logic implemented, or should part of the debugging focus include hardening that layer? Best Regards, Fizza Nadeem K