Hire the Best A/B Testing Specialists
in Romania

My goal is simple: help your SaaS product work better and feel better for users. Are bugs slowing your release? Users reporting issues? I’m a QA Engineer who ensures stable, user-friendly web apps. How I help: ✅ Manual QA (functional, regression, exploratory) for complex flows & edge cases ✅ UX/UI testing — usability, consistency, responsive workflows ✅ Automated UI flows (Selenium) for regression, smoke, performance ✅ API testing (Postman / REST) & database validation (SQL) ✅ Clear, structured test cases, bug reports, checklists, and QA documentation Why clients choose me: ✔ Strong bug-catching skills, improving product stability ✔ Fast, clear communication ✔ Structured QA approach with reproducible results ✔ Focus on making your product production-ready I test your product like a user, catch the bugs others miss, and help teams deliver smooth, reliable releases.

✔ 𝗜 𝗵𝗲𝗹𝗽 𝘀𝗺𝗮𝗹𝗹 𝗯𝘂𝘀𝗶𝗻𝗲𝘀𝘀𝗲𝘀 𝗽𝗿𝗲𝘃𝗲𝗻𝘁 𝗰𝗼𝘀𝘁𝗹𝘆 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗶𝘀𝘀𝘂𝗲𝘀 𝗮𝗻𝗱 𝗶𝗻𝗰𝗿𝗲𝗮𝘀𝗲 𝗿𝗲𝘃𝗲𝗻𝘂𝗲 𝘁𝗵𝗿𝗼𝘂𝗴𝗵 𝘀𝘁𝗿𝗮𝘁𝗲𝗴𝗶𝗰 𝗤𝗔 𝗮𝗻𝗱 𝘂𝘀𝗲𝗿-𝗳𝗼𝗰𝘂𝘀𝗲𝗱 𝘁𝗲𝘀𝘁𝗶𝗻𝗴. 🏆 𝟐𝟎𝟎 + web sites and 📱 𝟔𝟎+ mobile apps were tested, improved and debugged, ensuring the best quality, usability and conversion. 𝟏𝟎+ 𝐲𝐞𝐚𝐫𝐬 𝐨𝐟 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞, 𝟔𝟔𝟎𝟎 hours worked at Upwork. Experience in testing AI-driven apps. ▶ Senior Software Tester / QA Expert / Web & Mobile app testing / QA Analyst / WordPress pro / Project Manager. I work with small business: WordPress, WooCommerce, Shopify web development companies, early-stage SaaS startups, product owners and indie software developers. Your digital business's success is based on the quality of your software! My top priority is identifying issues before they reach your users. My specializations: • AI - Extended Manual QA: Mobile App Testing - iOS / Android, Websites testing • Technical Project Management 𝐖𝐡𝐲 𝐝𝐨 𝐜𝐥𝐢𝐞𝐧𝐭𝐬 𝐜𝐡𝐨𝐨𝐬𝐞 𝐭𝐨 𝐰𝐨𝐫𝐤 𝐰𝐢𝐭𝐡 𝐦𝐞? 👇 ✔"Vitaly is an amazing tester and gives such much attention to detail. He has given me new tools to use in my own business and has streamlined a lot of things for me. Could not recommend him more." As a results-driven QA Engineer, I deliver high-quality, reliable, and user-friendly products that exceed expectations. By leveraging a wide range of QA tools, devices, and testing methodologies, I ensure top-notch results that drive customer satisfaction. 🔍 𝑪𝒐𝒓𝒆 𝑴𝒂𝒏𝒖𝒂𝒍 𝑸𝑨 𝑻𝒆𝒔𝒕𝒊𝒏𝒈 𝑺𝒆𝒓𝒗𝒊𝒄𝒆𝒔: ✅ Risk-Based Testing ✅ AI-assisted QA ✅ Conversion focused e-Commerce QA ✅ Websites, Mobile App, Flutter, Game Testing ✅ Functional Testing ✅ Cross Browser / Cross Device Testing ✅ End-to-End Testing ✅ Compatibility Testing, Responsive Design Testing ✅ UI/UX Testing and Review ✅ Exploratory Testing, Black Box Testing ✅ Usability Testing, User Acceptance Testing (UAT) ✅ Smoke / Sanity, Regression Testing ✅ Beta Testing, Pre-Launch, Post-Release QA ✅ Test Case Design & Execution ✅ Agile Scrum ✅ QA Management ◉ Domains tested: AI - powered apps, Healthcare SaaS, WordPress, WooCommerce, E-commerce, Shopify, Laravel, OpenCart, Magento, Real Estate, Wellness solutions, Cloud-based SaaS, Kids and EdTech applications, CRMs, dating apps, Bubble io (no-code apps), custom websites, iGaming / betting, Online casinos and games. 🧪 𝑻𝒐𝒐𝒍𝒔, 𝑬𝒏𝒗𝒊𝒓𝒐𝒏𝒎𝒆𝒏𝒕𝒔 & 𝑫𝒆𝒍𝒊𝒗𝒆𝒓𝒂𝒃𝒍𝒆𝒔: • I combine the best QA techniques & AI to increase testing efficiency and covering • Mobile App Testing: Android Studio, TestFlight, Diawi, iMazing & Emulators, Postman • Bug Tracking & PM tools Jira, Trello, Asana, Monday com, Notion, GitHub I supply Detailed Bug Reports with Annotated Screenshots, Videos • Cross-device Testing: Browser Stack, Blisk, DevTools / Сonsole • Understanding frontend - HTML, CSS, JS • Familiar with on-page SEO Experience in QA Documentation - Design and UI testing: Photoshop, Figma, Adobe XD, PerfectPixel • Conversion: Hotjar - Project Management Support 🤝 𝐖𝐡𝐲 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞? As a Expert Software QA and Project Manager, I bring a unique blend of technical expertise and business awareness to every project. With a proven track record in WordPress web development and QA, I deliver high-impact solutions that drive results. By combining technical expertise with collaborative approach, I help my clients to launch reliable, user-friendly products that are over the top. My experience in the IT field is also underscored by the fact that I run my own WordPress / WooCommerce dev and QA company. Soft skills: ◉ Adaptable & Results-Oriented: I'm a quick learner who delivers results-driven solutions. I prioritize quality over everything else. ◉ Industry Expertise: I stay current with the latest industry trends, test design methodologies, and best practices in QA software testing. ◉ Dedicated Client Support: I'm always available for open communication, ensuring your needs are met and concerns are addressed. ✅ I can successfully meet deadlines. I'm available for both short-term QA tasks and long-term collaboration. 💬 There are few verified reviews from my happy Customers: ✔I can recommend Vitaly's website QA testing services enough. Their professionalism, speed, and meticulous attention to detail are second to none. If you are seeking top-notch QA services, Vitaly is the team to trust. I am truly grateful for their exceptional work and will undoubtedly engage their services for any future QA needs. ✔Vitaly paid great attention to details. I would recommend him on QA tester /Senior QA role. Well done!; ✔Excellent knowledge and experience about testing 📩 Let’s work together to ensure your product is fully tested and ready for success. Feel free to drop me a message on Upwork - just click the button in the top-right corner. 𝑩𝒆𝒔𝒕 𝑹𝒆𝒈𝒂𝒓𝒅𝒔, 𝑽𝒊𝒕𝒂𝒍𝒚 𝑩𝒊𝒆𝒍𝒊𝒂𝒌𝒐𝒗

I'm a frontend developer with more than 8 years of experience with building complex A/B tests using tools such as Optimizely, VWO, Google Optimize, Adobe Target and many others. I can easily build / QA and launch really complex A/B tests which include full page redesigns and multiple custom metrics to successfully track the KPIs and validation experiments hypotheses.

👋Hello! I'm Alexander Demchenko, a certified Conversion Rate Optimization (CRO) expert specialising in E-commerce, with over 8 years of experience in Digital Marketing. Having travelled a long journey in the industry and worked in various roles including PPC, Web Design, and Web Development, I possess a unique ability to analyze, evaluate, and make decisions holistically, considering all the components that influence your website's CR (Conversion Rate) and AOV (Average Order Value). ✅CXL Conversion Optimization Mini Degree 📊What sets my approach apart from other CRO experts? 1. Research first, then implementation or A/B testing. I am deeply convinced that significant results come from thorough qualitative and quantitative research. 2. A mathematical and analytical approach to CRO. I avoid subjectivity or bias, relying instead on data and facts, even in areas like copywriting or design. 3. Focus on one industry – E-commerce. Although I occasionally work on projects outside this field, my main expertise and preference lie in optimizing e-commerce websites. I believe that one cannot be a master of all trades. 🤩What my clients say: Serge Harcenko, MealTime 5/5 ⭐ ⭐ ⭐ ⭐ ⭐ - "Alexander did a great job auditing our website and creating a layout for an entirely new product page, significantly improving metrics that have been holding steady for over 3 weeks. We are continuing to work together to achieve a 6% conversion rate. Communication is at a high level, as are the reporting and work planning. I highly recommend him!" Ronald Bean, Daske 5/5⭐ ⭐ ⭐ ⭐ ⭐ - "A truly professional CRO expert with a strong background. I'm saying this after working with 5 specialists. I judge only by the numbers on my bank account. We are continuing to work and grow." Serge Polivar, SPM 5/5⭐ ⭐ ⭐ ⭐ ⭐ - "Good job for us and did everything we needed for our CR! Communication was easy and smooth. His attention to detail and professionalism, grounded in experience and knowledge, truly helped us achieve the results we needed. Highly recommended!" 🤝How can I help you achieve high CR, AOV, and ARPU? 🔍CRO Audits and in-depth funnel research -Google Analytics 4/GTM analysis and error fixing - Technical site audit to identify problem areas - Heatmaps, scroll maps, and session recordings (Microsoft Clarity, Hotjar) - UX audit of your site - Competitor analysis, audience segmentation, and behavioural pattern generation - Remote and moderated usability studies - On-site polls and customer surveys ⚙️Website Optimization and implementation of changes - Website design optimization: adjusting focal points, graphic elements, and images - Text optimization - Correcting the potential customer journey - Fixing technical errors - Integration of new functionality ⚖️A/B Testing (if your website has over 800-1000 sales per month) - Hypothesis generation based on analysis and material creation for testing - Running and monitoring A/B tests using VWO, FigPii, and similar tools - Identifying winning variations and implementing them on the site 📄Insights and reporting - Weekly/monthly detailed reporting on completed work and performance - Uncovering new insights and opportunities for improvement - Implementing new changes for continuous growth 🚀Let’s work together to turn your online store into a conversion-driving machine, generating significant revenue!