I help SaaS and healthcare tech teams ship reliable software faster with automation frameworks that actually hold up in production. With 7+ years in QA across web, mobile, and API and an ISTQB® Certification (CTFL). I've worked in regulated environments where a missed bug isn't just a bad review, it's a compliance risk or a revenue loss. What makes my work different: I've tested AI-driven systems including voice assistants, conversational flows and agent behavior covering edge cases, prompt manipulation and real-world failure scenarios. I've delivered in healthcare and fintech environments where accuracy and compliance are non-negotiable. My test suites consistently reduce manual regression by 70–90%. I can help you: Build Playwright or Selenium frameworks from scratch Stabilize flaky tests and improve pipeline reliability Convert manual test cases into scalable automation Test AI agents, LLM outputs and automated workflows Cover critical user flows, APIs, and edge cases end to end Tech Stack: Playwright • Selenium • Cypress • Appium • REST Assured • TypeScript • Java CI/CD: GitHub Actions • Jenkins • Docker If your team is shipping fast and quality is getting harder to maintain that's exactly where I work best.

I’m dedicated to ensuring software performs at its best. For me, testing is not just about identifying bugs, it’s about delivering a seamless and reliable experience for users. With experience across Android, iOS, and desktop platforms, I have an understanding of how each environment impacts usability. I focus on the finer details to identify and address potential issues early on, ensuring that the final product meets high quality standards. My commitment to excellence will make me to continuously improve, learn, and challenge myself to deliver the highest standards in everything I do. P. D. They call me bug hunter.

👋 Looking for a powerhouse full-stack engineer who can bridge Python-based AI innovation with Java-backed enterprise performance? I bring 25+ years of professional full stack software development experience-combining backend architecture, enterprise Java systems, AI/ML engineering, and modern frontend frameworks into scalable, data-rich applications for finance, healthcare, retail, manufacturing, and government sectors. With over 100 full-stack systems delivered, I've built mission-critical platforms and real-time analytics engines handling millions of events per day, while reducing operational costs by up to 65% through infrastructure optimization. 🏆 Why Work With Me? ✔️ 25+ years of enterprise-grade software development ✔️ 40+ Python projects using AI/ML for analytics, automation, and computer vision ✔️ 60+ Java systems modernized to Spring Boot, AWS & microservices ✔️ Built backend systems serving 10M+ users monthly ✔️ AI-based fraud detection systems with 98%+ accuracy ✔️ Scaled apps to handle 1M+ real-time events/second using Kafka, EventBridge, and Spark ✔️ Healthcare-grade imaging tools for tumor classification (TensorFlow + OpenCV) ✔️ 50+ legacy migrations from J2EE/Struts to microservices ✔️ Deployed full-stack apps across 20+ industries, including fintech, eCommerce, telecom, and eLearning ✔️ CI/CD pipelines & Dockerized monorepos for faster dev cycles and better team velocity 🧠 Tech Stack & Core Skills 🖥️ Languages: Python, Java, TypeScript, JavaScript, HTML5, CSS3, SQL, Shell Scripting 🧠 Python AI/ML & Automation: TensorFlow, PyTorch, OpenCV, Scikit-learn, NumPy, Pandas, Matplotlib AI Workflows | Computer Vision | Predictive Analytics | Data Pipelines | Image Recognition | Fraud Detection Automation using Python + Selenium, BeautifulSoup, Scrapy ☕ Java Enterprise Stack: Spring Boot, Spring Cloud, Hibernate, Akka, Play, Grails Java Microservices | RESTful APIs | SOAP | JMS | JPA | Quartz | Lombok Legacy Refactoring | J2EE → Spring Boot | Tomcat | WildFly | WebLogic 📊 Frontend (Full-stack Scope): Angular.js, Vue.js, React.js, Next.js, Svelte Tailwind, Bootstrap, Material-UI | JSP | Thymeleaf | JSF | EJS SPA Development | SSR/ISR | Responsive UI | Webpack, Vite, Gulp 📦 DevOps & Cloud: Docker, Kubernetes, AWS (Lambda, SageMaker, EC2, S3, Kinesis, RDS), GCP, Azure CI/CD: Jenkins, GitLab CI, Travis, Ansible, Terraform Infrastructure as Code | Monitoring | Cost Optimization 📚 Data & Databases: PostgreSQL, MySQL, Oracle, MSSQL, SQLite, MongoDB, Cassandra, Dynamo DB Elasticsearch, Redis, Kafka, RabbitMQ, GraphQL, REST APIs 📌 Python & AI-Focused Solutions 🔹 AI-Based Automation for Workflow Optimization 🔹 Real-Time Object Recognition & Computer Vision Systems 🔹 Predictive Analytics for Retail, Logistics, and Healthcare 🔹 NLP Chatbots and Intelligent Assistants 🔹 Data Crawlers & Scrapers for eCommerce & SEO 🔹 Data Normalization Pipelines Handling 1TB+ Datasets 📌 Java & Enterprise Software Development 🔹 Full-stack Java + Angular/Vue platforms 🔹 Spring Boot Microservices for Finance, Healthcare, SaaS 🔹 Event-Driven Architectures with Kafka & Redis 🔹 Secure Auth (JWT, OAuth2, LDAP, SSO, 2FA) 🔹 Migrating Monoliths to Microservices (Cloud-Native Refactors) 🔹 Server-Side Java with JSP, JSF, and Servlet APIs 📌 Full-stack Projects Built from Scratch 🔹 Inventory Management System (Java + Vue + AWS) 🔹 Medical Diagnosis Dashboard (Python + Django + React) 🔹 Financial Fraud Detection Engine (PyTorch + Kafka) 🔹 Real Estate Listing Platform (Flask + Angular + PostgreSQL) 🔹 ERP Extensions for Manufacturing (Spring Boot + Thymeleaf) 💬 Results That Matter ✅ Built an AI-based inventory forecasting engine reducing stock outs by 42% ✅ Scaled a Java backend to handle 5M+ daily requests for a logistics app ✅ Migrated 3 legacy apps to AWS with 65% infra cost reduction ✅ Automated scraping workflows gathering 10M+ data points weekly ✅ Designed OCR pipeline (Python + Tesseract) for medical record digitization ✅ Delivered HIPAA-compliant image analysis tools with 95%+ detection accuracy ✅ Cut fraud risk 75% for fintech app using real-time anomaly detection 💼 Industries Served 🏥 Healthcare & Diagnostics 💳 Fintech & Insurance 🛍️ eCommerce & Dropshipping 🏗️ Manufacturing & Supply Chain 📚 EdTech & LMS Platforms 🛰️ Gov & Aerospace (including secure environments) 🏢 Enterprise SaaS & Internal Tools Let’s build the next enterprise success story together. 💬 Message me to discuss your backend, AI/ML, or full-stack project! 🧩 Let’s Build Something Powerful If you’re seeking a seasoned backend + full-stack expert who can turn complex business logic into reliable, scalable, and secure digital solutions - I’m your guy. ----------------------

Having 7+ years of experience with a US-based healthcare tech company, I specialize in Healthcare IT with a strong focus on QA and software development in test. I ensure that every product meets quality, compliance, and performance standards while supporting business and clinical needs. In Healthcare IT, I have worked on EMR workflows, FHIR integrations, and patient record management, with expertise in clinical workflows. My work always prioritizes HIPAA compliance and data security. I also bring experience supporting US-based teams, making me comfortable with distributed collaboration and delivering within regulated environments. On the AI side, I have built automations and agent-based workflows that reduce manual effort for users. A recent project included developing an AI-powered SOAP note generator from recordings, designed to save clinicians time and improve accuracy. My focus is always on practical solutions that simplify processes and enhance usability. My current role is Project Manager, where I lead an engineering team and deliver high-quality AI-driven projects. As a Certified Scrum Master, I bring Agile coaching skills that keep teams aligned, efficient, and results-oriented. Key Skills Healthcare IT solutions & system integration AI apps, automations & agent systems Software development in test (QA-focused) Agile Coaching (Certified Scrum Master) Project Management for Software Development & Testing Quality Assurance Strategy and Consulting

Hi, I'm Volodymyr, an experienced Automation QA Engineer focused on using advanced tech and frameworks to ensure top-quality software delivery. My expertise spans: ⭐ Java: Writing efficient automation scripts and maintainable code. ⭐ Selenium & Selenide: Creating robust test suites for web apps. ⭐ BrowserStack: Conducting cross-browser testing for optimal functionality. ⭐ IntelliJ IDEA: Streamlining script development and management. ⭐ JUnit & TestNG: Designing comprehensive test suites for unit, integration, and functional tests. ⭐ JMeter: Conducting performance tests for scalability under varying loads. ⭐ Allure: Generating detailed test reports for informed decision-making. ⭐ JIRA & TestRail: Efficient issue tracking and systematic test case management. ⭐ HTML & CSS: Allowing to effectively navigate and assess web applications' front-end aspects. My professional traits include problem-solving, attention to detail, collaboration, and adaptability. Committed to optimizing testing processes, I ensure top-notch software solutions by implementing robust automated testing practices.

Expert with 6+ years of dedicated Software Testing experience in Manual and Automation for Web, Mobile, API, Games, Devices, and Desktop Testing in an Agile environment. 🥇 🏆 🏆 Worked on 40+ mobile and web-based applications. ✅ Dedicated full-time QA Analyst/Sr. QA Engineer/QA Mentoring 🌟 Skilled in applying various testing methodologies in diverse functional and technical domains 💡 Experience in testing web-based applications (including SaaS-based applications), content management systems, as well as mobile-based major platforms like iOS & Android. ⏳ Full-time Freelancer, 100% flexible, and can work in any time zone ⌚ Dedicated freelancer on Upwork. ⭐ QUICK HIGHLIGHT⭐ ✔ Qualifications include 6+ years of QA & Software Testing experience ✔ 40+ projects completed for Mobile, Web, Desktop, API, and Game 🏆 ✔ Acquired ISTQB Certified Tester Foundation Level (CTFL) Certification 🥇 ✔ Acquired ISTQB Certified Tester Agile Certification 🥇 ⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋ EXPERIENCE SUMMARY: 💡 ⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋ ✅ Altogether, I have 6+ years of experience in Quality Assurance ✅ 6+ years in Web Application Testing ✅ 6+ years in Mobile App Testing ✅ 6+ years in Desktop App Testing ✅ 5+ years in eCommerce Products Testing ✅ 4+ years in SaaS Product Testing ✅ 3+ years in Web/Mobile/API Automation Testing ✅ 3+ years in Microservices Testing ✅ 3+ years in API/Webservice Testing ✅ 1+ years in Performance Testing ✅ 1+ years in SCRUM MASTER RO ✔ Acquired ISTQB - Foundation and Agile Certification 🥇 ✔ Degree of Master of Computer Science 📌 Testing Skills : ☛ Test plan creation, Test scenario creation, Test data creation, Test case execution ☛ Usability testing, Regression testing ☛ Manual testing, Web testing, Mobile app testing, Functional testing ☛ User interface testing, Browser compatibility testing, Cross browser testing ☛ Test Cases, and defect reporting. ☛ Methodologies and phases of SDLC, and STLC. 📌 I can help you with the following: ✔ Software QA Consulting ✔ Software Development Audit ✔ Functional Testing of Software ✔ Website Testing and Bug Reporting ✔ Test Automation ✔ Backend API Testing ✔ Mobile app Testing and Automation 📌 Domains: ➞ SaaS ➞ eCommerce & Retail ➞ FinTech ➞ Travel & Hospitality ➞ Consumer Product ➞ Chatbot ➞ ERP & CRM ➞ HealthCare ➞ HRMS ➞ Education ➞ Media & Entertainment ⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋ 🛠️ TOOLS EXPERTISE: ⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋⚋ ➞ JIRA, Azure DevOps, Bugzilla, Trello, Zoho, TestLink, ClikUp, Figma ➞ QC, TestRail, Xray, Zephyr, TestDirector, Test Lodge ➞ Playwright, RestAssured, ➞ Postman, SoapUI, Swagger ➞ Load Runner, JMeter, NeoLoad, WebLOAD ➞ Browserstack, Lambdatest, Emulators ➞ Word, Excel, PowerPoint ➞ GitLab, GitHub, Jenkins 📌 Strengths: ➞ High level of software testing methods and technologies ➞ Business applications (B2B, B2C, C2C, SaaS) ➞ Leading the software testing process ➞ Establishing a software testing process from scratch Certifications: 📃 ISTQB Certified Tester - Foundation Level 📃 ISTQB Certified Tester - Agile Education: 🎓 Master's Degree in Computer Application 🎓 Bachelor's Degree in Computer Application ✔️ Functional QA ✔️ Website testing ✔️ Manual QA ✔️ Bug report✔️ iOS and Android app testing ✔️ Regression Testing ✔️ UI & UX QA ✔️ WordPress QA ✔️ API Testing ✔️ End-to-end testing ✔️ Shopify QA ✔️ Manual testing ✔️ Playwright

I worked as a QA Engineer for over 7 years, mainly in e-Commerce and Healthcare Industry. I also have experience in Test Planning & Project Management, leading a team and as well as experience in Web Design, Front-end development, Video Editing, Graphics Design and more. I can work with less supervision and works well under pressure.

I’m a dedicated with over 3 years of hands on experience in: Manual Testing of websites, mobile apps, close testing, software, and games Customer Support that’s professional, empathetic, and solution-focused Trusted App Testing Partner | Google Play Closed Testing | 12 Testers for 14 Days | 30+ Apps Successfully Published What I Can Do for You: Quality Assurance Services I will test your website testing, mobile app testing, or game testing and deliver a detailed bug report with clear, actionable suggestions for improvements. → Testing Expertise: → Functional Testing → Usability Testing → Regression Testing → Compatibility / Cross-Browser Testing → Smoke Testing → User Acceptance Testing (UAT) → Black Box Testing → Website / Mobile App / Software Testing Customer Support Services: I can handle customer queries through email, chat, or ticketing systems, ensuring a professional and positive user experience. Support Skills: → Responding to customer inquiries with clarity and empathy → Troubleshooting technical issues → Reporting recurring issues to the dev/QA teams → Creating and maintaining support documentation or FAQs → Using helpdesk tools like Zendesk, Any-desk, or Intercom I combine attention to detail with excellent communication, making me a great asset for both testing your product and supporting your users. I also do Google Closed App testing, where I have 14 testers and 14 different mobile devices. Let’s work together to make your product not only bug-free but also backed by outstanding customer support!

Mobile apps have become the primary way businesses connect with customers, streamline operations, and accelerate growth. As a Mobile App Developer, I help startups, growing companies, and enterprises transform ideas into scalable mobile products that deliver measurable business value. Whether you’re building a new application or modernizing an existing one, I focus on creating high-quality solutions powered by modern technologies and AI For more than 10 years, our team has been designing, developing, and scaling mobile products for companies worldwide. We combine the expertise of Mobile App Developer specialists, React Native engineers, Flutter developers, iOS Developer professionals, and Android developers to build secure, scalable, and user-friendly mobile applications. Our experience also includes AI-powered features, backend development, API integrations, and cloud-native architectures Our company metrics: • 10+ years of software development experience • 200+ successfully delivered projects • 20,000+ tracked hours on Upwork • 40+ software engineers and mobile specialists • $1M+ earned through successful client engagements • 5+ years average commercial experience per developer As a Mobile App Developer, I work closely with founders to define product strategy, validate ideas, and deliver production-ready applications. Our team builds cross-platform solutions using React Native and Flutter, as well as native applications for iOS Developer and Android environments. We also integrate AI capabilities where they create real business value, helping companies automate workflows, personalize user experiences, and improve operational efficiency Our projects range from startup MVPs to enterprise platforms supporting thousands of users. Every Mobile App Developer on our team collaborates with experienced Flutter developers, React Native engineers, Android developers, iOS Developer specialists, full stack developer teams, web developer professionals, and backend engineers to deliver reliable products from concept to launch We specialize in mobile app development across healthcare, fintech, logistics, education, marketplaces, SaaS, workforce management, and customer engagement platforms. Whether the project requires Flutter, React Native, or native Android and iOS development, our focus remains the same—building applications that are fast, secure, intuitive, and ready to scale Our expertise extends beyond coding. We help clients choose the right architecture, define product roadmaps, optimize user experience, and integrate AI-powered functionality into existing and new mobile products. Working alongside flutter developer, android developer, web developer, and full stack developer teams allows us to deliver complete end-to-end solutions instead of isolated development services We regularly build applications using React Native, Flutter, Java, Kotlin, Swift, React, Python, Kotlin, and Laravel, integrating secure APIs, cloud services, payment systems, authentication, push notifications, analytics, and AI-powered automation. Every Mobile App Developer on our team understands how to create applications that perform consistently across Android and iOS devices while maintaining excellent user experiences Every Mobile App Developer on our team focuses on building products that combine outstanding performance, scalability, and long-term maintainability. Using React Native, Flutter, Swift, native Android, and iOS Developer best practices, we create applications that support rapid business growth and evolving customer needs. Our full stack developer, web developer, flutter developer, and android developer teams collaborate throughout the entire product lifecycle, while AI technologies help deliver smarter mobile experiences, personalized recommendations, intelligent automation, and data-driven decision making AI has become an important part of modern mobile app development. We help businesses integrate AI into mobile products through intelligent assistants, automation, predictive features, recommendation engines, and AI-driven user experiences. Instead of adding AI as a trend, we implement practical solutions that improve customer engagement and simplify business operations Whether you need a Mobile App Developer to launch a new MVP, migrate an existing application to React Native or Flutter, modernize an Android application, improve an iOS product, or expand your engineering team, we can help. Our experience covers the entire product lifecycle—from discovery and architecture to development, testing, deployment, and long-term support If you’re looking for a trusted Mobile App Developer with expertise in React Native, Flutter, iOS Developer, Android, Swift, AI-powered applications, and scalable mobile app development, let’s discuss your project and build a solution that creates lasting business value

Full Stack Developer | 5M software End-Users Impacted | $200K+ Total Earnings | Expert-Vetted (Top 1% Upwork) | 26 Projects | 100% Job Success | 12+ Years on Upwork | 5339+ Hours Worked | TOP RATED PLUS – Top 3% of companies | 15+ Countries Covered 🙈 “Can we just quickly fix this?” 🙊 “It’s probably just a small change.” 🙉 “Let’s ship first and think later.” I am a CEO and Business Manager at Peppernode. I help create systems where architecture matters, decisions matter, and the cost of mistakes is higher than the cost of doing it right. Call me Illia. ✅ Full Stack Developer React ✅ React Developer ✅ React Native Developer ✅ React Native Mobile Developer ✅ Python Developer ✅ Front end Developer ✅ Mobile App Developer ✅ SaaS Developer With 12+ years of experience, I specialize in building scalable SaaS platforms, high-performance mobile applications, and production systems designed for long-term growth. I work as a React Full Stack Developer, React Native App Developer, React Developer, and Python Developer, helping startups and established businesses transform ideas into reliable products that scale. Over the years, I've delivered 31 successful projects for clients across 15+ countries, building products that now serve more than 5 million software end-users worldwide. As an Expert-Vetted professional with 100% Job Success, $200K+ 🏆 Why Clients Choose Me As a Full Stack Developer React with 31 successful projects delivered across 15+ countries, I've helped build products now serving more than 5 million end-users worldwide. With 100% Job Success, $200K+ earned, and 5,339+ hours worked on Upwork, I bring proven experience designing scalable applications, validating product strategies, and helping businesses make the right technical decisions from day one. 🚀 SaaS Product Development I build modern SaaS platforms as a Full Stack Developer React using React, Python, Firebase, scalable architecture built to scale. I work as a React Developer Firebase with 20+ SaaS projects delivering connected experiences across frontend and backend systems. My experience includes architecture planning, MVP development, frontend/backend implementation, payment integrati. 📱 React Native App Development As a React Native Developer and React Native App Developer, I build cross-platform apps for iOS and Android. As a React Developer and Mobile App Developer, I deliver 20+ React Native Mobile solutions focused on reliability and performance. As a react native developer expo specialist, I move products from MVP to production while maintaining a high-quality user experience. I've delivered 20+ mobile features across mobile app development react native projects for startups and businesses requiring speed, flexibility, and long-term scalability. My work includes React Native and Expo development, feature delivery as a full stack developer react native, mobile MVPs and enterprise applications, API integrations, App Store and Google Play releases, performance optimization, product support. I have experience as a node js react native mobile developer building connected mobile ecosystems powered by scalable backend services. 🍽 Restaurant Ordering Systems I have experience developing restaurant ordering solutions serving thousands of daily users, with a strong focus on reliability, operational efficiency, and seamless customer experiences. Several included React Native Mobile experiences for customers and operational teams. These systems require solid architecture and stable integrations. 📌 Existing Product Modernization Many teams come to me after moving too fast. As a Full Stack Developer React, I improve existing applications through refactoring unstable codebases, optimizing performance bottlenecks, introducing scalable architecture, reducing technical debt, and expanding functionality without sacrificing maintainability. 🤖 AI Integrations & Automation I work as a Full Stack Developer AI building solutions with OpenAI API, Gemini, LangChain, Copilot, and modern AI workflows. Built 20+ AI integrations using OpenAI API, Gemini, and LangChain to create intelligent product experiences, including AI-powered features, chat interfaces, workflow automation. 🔧 Workflow & Tech Stack Discovery and planning begin with business analysis, technical discovery, architecture decisions, and product strategy. Frontend technologies include React, React Native, Expo, TypeScript, JS, HTML5, CSS. Backend development is built with Python, FastAPI, Django, Node.js, REST APIs, GraphQL, PostgreSQL, MySQL, Firebase, Stripe integrations. As a Python Full Stack Developer Flask specialist, I focus on maintainable systems, integrations, and architectures designed for long-term evolution. 🚀 Need a Web Developer, React Developer, React Native Developer, Full Stack Developer React Node or Python Full Stack Developer who thinks beyond code and builds products designed to scale? Let’s talk.