Full Stack Developer | SaaS & MVP specialist. Backed by 20+ years building scalable web apps with React, Node.js & .NET for startups and product companies. I work with founders and product teams from day one – helping them validate ideas, build MVPs, and scale into production-ready platforms. My focus is not just clean code, but business outcomes: faster time-to-market, stable architecture that scales, and features that users actually need. Behind every engagement is a 330+ engineer team covering full-cycle product development – frontend, backend, cloud, DevOps, QA, and AI integration – so you never hit a skills gap mid-project. 💡 Case Studies 🚛 MyCarrierTMS (Logistics SaaS, USA) – Built a transportation management platform from MVP to enterprise-grade product. Delivered real-time rate comparison, automated shipment tracking, and third-party API integrations (project44, Stripe, Recurly). Team scaled from 5 to 25 engineers as the product grew. Stack: Angular · .NET · TypeScript · Azure · MongoDB Result: 99.97% availability · $36.8M total funding · FreightWaves FreightTech 25 Award · #1-rated TMS on G2. ⚖️ Denbeaux (LegalTech, USA) – Built a web platform that fully automated fraud case outreach for a US-based law firm. Replaced a manual Excel-based workflow: the system now retrieves legal case data, enriches it, generates personalized PDF letters, and dispatches physical mail – all automatically. Stack: .NET 8 · Angular 16 · AWS · PostalMethods API Result: 800x time savings – from 69 hours of manual work to 5 minutes · seamless expansion to new case types without additional development. 💰 LimpidMarkets (FinTech, London/Zurich OTC) – Took over and scaled a real-time precious metals exchange platform for interbank markets. Delivered real-time price synchronization, customized order visibility, and banking API integrations while maintaining compliance with finance industry regulations. Stack: React · Redux · Node.js · Elixir · Symfony · AWS Result: 40% client business growth · 24/7 availability across all time zones · user base includes Deutsche Bank, Citibank, Morgan Stanley, BNP Paribas. 🏥 Flexwise Health (HealthTech SaaS, USA) – Evolved an on-demand hiring platform for nurses into a full clinic staff management system. Refactored monolith into microservices, integrated AI-powered workload prediction, and ensured seamless EMR system integrations. Stack: React · TypeScript · Node.js · Nest.js · MongoDB · AWS Lambda Result: $6M in funding raised · acquired by Aya Healthcare · increased platform stability and scalability throughout rapid growth. 🌐 Frontend React · Redux · Angular · TypeScript · Next.js · Vue.js ⌨️ Backend Node.js · Nest.js · .NET · Symfony · Elixir · REST & GraphQL APIs 🗄️ Databases MongoDB · PostgreSQL · MySQL · Azure SQL · Redis · Elasticsearch ☁️ Cloud & Infrastructure AWS (Lambda, EKS, RDS, S3, CloudFront) · Azure · Docker · Kubernetes 🤖 AI Integration OpenAI API · ChatGPT integration · AI-powered workflow automation LLM-based data processing · AI workload prediction · Intelligent automation 💳 Third-Party & Payments Stripe · Recurly · project44 · Banking APIs · PostalMethods EMR/EHR systems · Custom REST API development Why teams choose us: ✅ Full product lifecycle – from discovery and architecture to deployment and long-term maintenance ✅ 330+ engineers across frontend, backend, DevOps, QA, and AI – no skills gaps mid-project ✅ 2,250+ delivered projects across FinTech, HealthTech, LegalTech, Logistics, and B2B SaaS ✅ We've supported products through multiple funding rounds – we know what investor-ready architecture looks like ✅ GDPR-compliant development · EMR/EHR integration experience · finance industry compliance Ready to build your SaaS product or scale an existing platform? Send me a message – I'll respond within a few hours with a clear assessment and a proposed first step. [Updated: April 2026]

Senior Manual QA Engineer | Software QA Engineer| 7 Years of Experience in IT Industry Greetings Thanks for posting a job on Upwork platform. I have analysed and reviewed the job description carefully. I have around 6.5+ years of work experience as a QA in IT Industry. During this experience I have tested various websites and mobile applications. In Websites, I have performed below types of testing 🧪 Manual QA Expertise • Functional Testing • Regression Testing • UI/UX Testing • Integration Testing • End‑to‑End Testing • Exploratory Testing • Cross‑Browser Testing • Mobile App Testing (Android & iOS) • Usability Testing • Payment Gateway Testing • System & Acceptance Testing • Test Case Design & Execution • Defect Reporting & Management (Jira) • UAT Support • Responsive Testing • Requirement Analysis • Test Documentation (Test Plans, Test Cases, Reports, SOP Document, Use Cases, Confluence pages) I have great experience in using various tools of testing, some of them on which I have worked are listed below For Bug Logging : JIRA, TFS, Google Spreadsheet, Clickup For Test Cases : JIRA, Test Rail, Google Spreadsheet For Broken Link Checking : Web link Validator For Automation : Selenium IDE For API Testing: Postman, JMeter For Load/Stress Testing: JMeter For Documentation: Confluence Agile/Scrum Test Plans, Test Cases, Traceability Matrices SDLC & STLC 🏆 Key Achievements:- 🏆 Reached 100% Job Success in only one month by delivering reliable, detail‑oriented QA work and exceeding client expectations from the very first projects. ⭐ 4+ 5-star reviews from satisfied clients • Delivered zero‑defect releases across multiple sprints • Improved test coverage by 30% through detailed test case design • Identified critical defects that prevented major production issues • Built reusable API test suites in Postman • Successfully tested e‑commerce and mobile applications 📱 Devices I Test On 📱 Android: Samsung Galaxy S24 Ultra, Samsung Galaxy S21 Plus, Poco X4, RealMe GT Master Edition, OnePlus 9, OnePlus 8T, Samsung A18 📱 iOS: iPhone 16 Pro Max, iPhone 14 Pro Max, iPhone 14 Plus, iPhone 13 Pro Max, iPhone 11, iPhone XR 💻 Desktop: MacBook Air, HP Pavilion X360, RealMe Book, Lenovo ThinkPad, Samsung Galaxy Book 4, Dell, IPad 🌍 Domain Expertise • E‑commerce • Mobile Applications • Order & Checkout Workflows • Payment Integrations ⭐ Why Clients Choose Me ✔ Strong defect‑finding ability ✔ Clear communication & detailed documentation ✔ Fast turnaround with high accuracy ✔ Experience across web + mobile ✔ Reliable, detail‑oriented, and quality‑focused ✔ Flexible availability across time zones Related Keywords: Manual Testing, API Testing, Web Testing, Mobile App Testing, Regression Testing, Cross-Browser Testing, Test Case Design, Jira, UI/UX Testing, End-to-End Testing, Functional Testing, Bug Reports, Quality Assurance, Payment Gateway Testing, iOS Testing, Android Testing, Test Plan, Usability Testing, User Testing, Software Testing, Manual QA, AI Testing, Chatbot Testing, Voice AI Testing, NLP Testing, Mobile App QA, Conversational AI, AI Model Evaluation, Reverse Testing, PWA Testing, Progressive Web App Validation, AI Apps Testing, Progressive Web Application, OpenAI, AI Apps, ChatGPT, Sora, Gemini, Generative AI, Chatbot I am committed to delivering error‑free, high‑performing software and helping clients launch products that users trust and love. If you need a Software QA specialist who ensures smooth releases, zero‑defect delivery, and consistent quality, I’m here to support your project. Lets Hope in, Pooja

🚀 Launching a SaaS, AI App, or Web Platform? Your users won't report every bug they'll simply leave. I help startups, SaaS companies, and growing businesses identify critical issues, broken user flows, and hidden defects before they impact conversions, revenue, and customer trust. My goal is simple: help you release a stable, reliable product that delivers a great user experience from day one. Are You Facing Any of These Challenges? • Bugs slipping into production after release? • Features working differently than expected? • User flows breaking and hurting conversions? • Need an experienced QA to validate your product before launch? • Looking for detailed bug reports that developers can fix quickly? If yes, I can help. 🔍 What I Can Help You With ✅ Manual Testing (Functional, Regression, Exploratory, UAT) ✅ SaaS & Startup Product Testing ✅ AI & Chatbot Testing ✅ Web Application Testing ✅ API Testing (Postman) ✅ Cross-Browser & Responsive Testing ✅ Mobile Responsive Testing ✅ Test Case Creation & Execution ✅ Smoke & Regression Testing ✅ Bug Reporting & Tracking (Jira, ClickUp, Trello, Azure DevOps) ✅ Selenium Automation Testing 🧪 What You'll Get Working With Me • Thorough end-to-end testing from a real user's perspective • Detailed bug reports with screenshots, videos, and clear reproduction steps • Severity and priority assessment for faster issue resolution • Clear communication and regular testing updates • Actionable feedback to improve usability and user experience • Faster, more confident product releases 📊 Experience Highlights ✔ 5+ Years of Software Quality Assurance Experience ✔ Tested SaaS Platforms, AI Applications, CRMs, E-commerce, and Complex Web Systems ✔ Identified critical UI, functional, and workflow issues before production releases ✔ Helped teams improve product stability and reduce post-release defects ✔ Experienced working with startups, agile teams, and fast-paced development environments 🛠 Tools & Technologies • Jira, ClickUp, Trello, Azure DevOps • Postman • Selenium WebDriver • Chrome DevTools • BrowserStack • TestRail • ChatGPT & AI-Assisted Test Case Generation Quality isn't just about finding bugs it's about ensuring your users have a smooth experience and confidence in your product. 📩 Send me a message with your project details, and I'll help uncover issues before your customers do.

I’m a highly-detailed Software Quality Assurance Tester, with over 11+ years of hands-on experience testing web, mobile, and desktop applications. I'm passionate about testing, and finding solutions, for companies to create a reliable digital product free of bugs. My specialties include: ========================== • Mobile/Web Application Testing • Manual testing • Mobile App Testing • Detailed Test Plan & Test Case Development • API Testing: PostMan • JIRA • Excellent debugging skills • Proficiency in various testing tools, such as Selenium, Appium, and SoapUI Available Physical Testing Devices =========================== Apple: iPhone 11, Macbook Pro Android: Android - Google Pixel 7a, Samsung Galaxy, Vivo A15 Desktop: Windows, OS X - Mac Project Management and Defect Tracking Tools ======================================= JIRA, Trello, Bugzilla, Zenhub, Confluence, Test Rail

I am an ISTQB-certified QA specialist with 7 years of experience in testing Web and Mobile Apps . I had an opportunity to participate in various projects from different domains. I enjoy every aspect of my job and am passionate about improving quality to satisfy end-users of your App. My skills and tools: - Manual QA: JIRA, Confluence, Figma, Solution Documents, TestRails, Bugzilla - Programming languages (Java, Python, JavaScript, SQL) - Automation Testing (Selenium, Cypress, Playwright, Puppeteer) - CI/CD and Version Control: Azure DevOps, Git, GitHub Actions, Maven, Jenkins - Functional Testing - Non-Functional Testing - Experience in automating API testing using SOAP UI, Postman and RestAssured - UI, Pixel Perfect, and Usability Testing - Compatibility testing: Browser, Responsive/Adaptive, OS, Device - Mobile Application testing - Test Documentation Development: Test Cases Repository, RTM, Test Strategy, Test Report - Establishing a software testing process from scratch - Localization, Internationalization testing ---------------- Domains ----------------- - Finance and Banking - Cryptocurrencies and Digital Wallets - Decentralized Applications (DApps) - Gaming - Education - Real Estate - Ecommerce & Retail - Media & Entertainment - Travel and Hospitality - Healthcare & Life Sciences

I am an eager, self motivated and passionate QA engineer with an eye that is attentive to details and an immaculate attitude towards the business. I do manual and automated testing for web applications, mobile applications and APIs. As a junior, I'm looking for an opportunity to prove myself and my abilities. I'm reliable, quick at work so getting the job done is absolutely guaranteed. 🚀 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 𝗮𝗻𝗱 𝘀𝗸𝗶𝗹𝗹𝘀 𝗜'𝗺 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲𝗱 𝗮𝘁: ✅ Manual Testing. ✅ Automation testing using PlaywrightJS. ✅ Designing and executing test cases based on the requirements. ✅ Test management and bug reporting using Jira and Zephyr Scale. ✅ Test management and bug reporting using TestRail. ✅ Mobile Testing. ✅ API Testing using Postman. ✅ Web Applications Testing. ✅ Agile Methodologies. ✅ Selenium. ✅ Katalon Studio.

Nice to meet you all, my name is Jonathan Mercado. A system engineer with 5+ years of experience working as a QA Manual Tester. Throughout my career, I have participated in various projects and environments, utilizing both Agile and Waterfall methodologies. I have worked on software testing, websites, e-commerce, video games, banking systems, among others. My goal is to offer you all my experience and knowledge to ensure the quality and proper functioning of your project. Methodologies and Types of Testing I Use: - Functional Testing - Beta/Alpha Testing - Usability Testing - Acceptance Testing - Mobile Testing (iOS/aOS) - Accessibility Testing - API Testing Tools and Communication Platforms: - Jira (For reporting and tracking bugs found) - Confluence (For project documentation) - TestRail (For creating and executing test cases) - BugHerd - ALM - Postman - SoapUI - Microsoft Environment (Teams, Google Sheets, Office, etc.) I am convinced that my experience and skills can significantly contribute to the success of your project. I look forward to the opportunity to collaborate with you in the future.

Hi, I'm a full-stack developer and mobile app developer shipping React, React Native, and Node.js MVPs for SaaS, wellness, fitness, and social app startups. Top Rated Plus, 100% JSS, 1,800+ Upwork hours, $70K+ earned. Over the last 10 years, I've built and shipped production web and mobile products for funded startups, product teams, and CTOs across the US, EU, and UK. As a full-stack developer, I architect and code the whole pipeline: React and Next.js frontends, Node.js and NestJS backends, React Native mobile apps, and AI integration on top. As a mobile app developer, I deliver iOS and Android apps with React Native, fully integrated with custom Node.js or Java Spring Boot backends. What I Do Best - Full-stack SaaS platforms: React, Next.js, Vue.js, Node.js, NestJS, TypeScript, with production UX in Tailwind CSS and Material UI. - Mobile app development: React Native for iOS and Android, native feel, App Store and Google Play ready, with Stripe, PayPal, and In-App Purchases for monetization. - AI features for web and mobile: OpenAI API, LangChain, RAG pipelines, ElevenLabs voice AI, computer vision, smart chatbots. - MVP development: wireframes to launch in weeks, not months, for funded startups. - Project rescue: rewriting Lovable and no-code MVPs into production React and React Native codebases. - Enterprise modernization: Java Spring Boot backends, Angular.js to Angular migrations, admin dashboards. - REST and GraphQL APIs integrated with Stripe, PayPal, Twilio, Mixmax, Gmail, and Outlook. - Cloud and DevOps on AWS (Lambda, EC2, RDS, S3, Cognito, Amplify), Vercel, Docker, PostgreSQL, MongoDB, MySQL, Firebase, Supabase, with CI/CD. Tech I Use Daily - Frontend: React, Next.js, Vue.js, TypeScript, Tailwind CSS, Material UI, Redux - Backend: Node.js, NestJS, Express, Java, Spring Boot - Mobile: React Native, Flutter - AI/ML: OpenAI API, LangChain, RAG, ElevenLabs, computer vision - Cloud: AWS, Vercel, Docker, CI/CD - Databases: PostgreSQL, MongoDB, MySQL, Firebase, Supabase - APIs: REST, GraphQL, Stripe, PayPal, Twilio, Mixmax Real Project Examples - Gamified Fitness MVP. As lead full-stack developer, delivered a React Native fitness app in 1 month with 3x AI-boosted development speed. Real users in the App Store inside 30 days. - Wellness and Social App. As full-stack developer and mobile app developer, rebuilt a Lovable MVP into a production React Native plus Node.js codebase with real-time feeds and a matching engine. 80% increase in daily engagement. - HR-Tech SaaS with AI Predictions. Gamified HR platform with ML-driven performance predictions. 120% performance gain, 3x faster data processing. - AI Sports Analysis Platform. Computer vision platform for tennis technique review. 80% faster analysis vs. manual review. - EdTech Platform for Norway's Leading Language Provider. React-based learning platform with real-time progress tracking and content management. How I Work - Weekly written updates, so you always know status and next steps. - Direct technical recommendations on Node.js performance, Java backend architecture, and AWS cost from day one. - Backed by Dewais, a 40+ person team, so I can bring in extra engineers when scope grows. - Comfortable joining ongoing projects or building from zero. - Full ownership across React web, React Native mobile, and AWS infrastructure. Ideal Clients Funded startups and product teams building SaaS, wellness, fitness apps, social apps, EdTech, and HR-Tech products. I also support mid-size businesses modernizing legacy Angular frontends and Java Spring Boot backends. Most engagements start as an MVP and grow into multi-year work, 94% long-term client retention. As a full-stack developer and mobile app developer, I deliver React and React Native products, Node.js APIs, AI integrations, and AWS infrastructure for SaaS, wellness, fitness, and social app startups. Send your idea, prototype, or wireframes. I'll reply within a few hours with technical recommendations and a preliminary timeline. Free 30-minute audit call included.

I help SaaS startups, e-commerce businesses, and HRMS product teams release stable, user-ready applications by identifying critical issues before they affect users, employees, or revenue. With 9+ years of hands-on manual QA experience, I specialize in end-to-end testing of web and mobile applications, with deep understanding of SaaS platforms, HRMS systems, and e-commerce workflows. ✅ Core areas of expertise: • SaaS application testing (user roles, subscriptions, billing, dashboards) • HRMS / HR software testing (employee lifecycle, attendance, leave, payroll, approvals, role-based access) • E-commerce testing (product catalog, cart, checkout, payments, coupons, orders) • Functional, regression, smoke & UAT testing • Cross-browser & cross-device testing • Test case creation, test planning & execution • Defect tracking & reporting (Jira) 🔍 How I help your team: • Detect high-impact bugs early and reduce production issues • Ensure smooth user, employee, and admin workflows • Deliver clear, actionable bug reports developers can fix fast • Collaborate effectively with product managers and developers in Agile teams I focus on quality, clarity, and business impact, so you can ship confidently with fewer risks and better user experience. If you’re looking for a reliable QA professional with experience across SaaS, HRMS, and e-commerce products, I’d be happy to discuss your requirements.

I am a full-time UI/UX and WEB DESIGNER || SOFTWARE QUALITY ASSURANCE ENGINEER and ANALYST on UPWORK with expertise in MOBILE APPLICATION(BOTH iOS & ANDRIOD),WEBSITES and HYBRID APPLICATION DESIGNING AND TESTING, Cross Platform Mobile app and Website Testing. And providing intuitive design that are responsive across all platforms. ✅ Proficient in using Figma, AdobeXD, Framer and WordPress to design responsive, engaging and intuitive mobile application (Both Android and iOS), Websites, Web-App and Hybrid Application ✅ Also experienced in using with Automated Testing Tools such as: Appium, Selenium Web-Drive Library, Java and Nodejs ✅ Experienced in executing documentation for: Test Requirement |Test Plan | Test Strategy | Test Case | Test Scenarios | Tractability Matrix | User Flow | Bug Report | Bottleneck areas of applications | Test Summary Report Over the years, I have been helping clients from all over the world finding solution to their problems by creating multiple great-looking designs for startups, as well as big and small established businesses and also as a Professional Software Quality Assurance Engineer and Analyst help enterprises reviewing project requirements and user stories, developing acceptance criteria, writing and executing test cases, and providing detailed test reports upgrade their software to a higher level of quality to foster better user experiences. I am available for any role regarding Software Quality Assurance Analyst and UI/UX and Web Design and open to various projects ranging from simple to complex projects. Project Execution Summary For Software QA Testing: ✅ Get involved in Software Development and Testing Lifecycle ✅ Experience in Manual Testing and web application Testing ✅ Bug Tracking Tool & Process using Agile methodology ✅Analyze Test case and make the bug reports according based on client’s demand and provide a full knowledge of finding critical ,functional ,visual and usability bugs ✅Always follows test case Rules and the environments ✅Excellent communication, Great interpersonal skills. Quick learner, versatile, adaptable and process -oriented with high customer orientation Area of Specialization For UI/UX and Web Design: ✅ UI/UX Mobile App Design (both Android and iOS) and Web Design ✅ Ecommerce site and Landing Page ✅ Product research and analysis ✅ CRM websites and Dashboard ✅ Creating User Personas, User flow, Wireframe and Interactive (clickable) prototypes ✅ Creating UI Animation and collaborating with developers I'm not an average UI/UX and Web Designer and Software Quality Engineer, Analyst and Tester and if you'd like to get a feel of what I do that's little different from everyone else, then don't hesitate to reach out!