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I am a detail-oriented Manual QA Tester with over 10 years of experience helping clients deliver stable, user-friendly, and bug-free applications. I specialize in testing web and mobile applications, ensuring that functional, UI, usability, and regression issues are identified and resolved before they reach your users. I have also worked with AI-powered websites, testing AI-driven features, workflows, and user interactions to ensure accuracy, reliability, and seamless performance. What I Can Help You With: ✔ Manual Testing (Web & Mobile Applications) ✔ AI Website & Feature Testing ✔ Test Case Creation & Execution ✔ Detailed Bug Reporting (clear steps, screenshots, screen recordings) ✔ Smoke Testing ✔ Regression Testing ✔ Exploratory Testing ✔ API Testing using Postman Tools I Use: Jira | Trello | Asana | TestRail | Google Sheets | Postman I focus on clear communication, fast turnaround, and delivering high-quality results. My goal is to help you release confidently with a smooth and reliable product. Available Devices for Testing: ✔ MacBook Pro ✔ Lenovo IdeaPad 3 (Windows) ✔ iPhone 11 Pro Max ✔ Android Devices: OnePlus 9 5G, Samsung Galaxy S21 FE 5G ✔ Tablets: iPad (8th Generation, 2020), Huawei MediaPad If you're looking for a reliable QA professional who treats your product like their own, let's connect!

As a qualified Software Developer & 3D Programmer with over 15 years of experience in the industry, I offer knowledge and proficiency in a large number of programming languages, frameworks and platforms. This includes (almost) anything from lowest-level embedded development on Linux with pure C over time-critical optimization of video encoding in AWS EC2 to web-only and mobile-first frontend development with and without 3D rendering. If it can be done via programming, I am confident that I can do it, and will do so reliably and with transparent communication. The services I offer include, but are not limited to: - Application development - Web development - Command line utilities and scripting - Backend, Frontend or Full-Stack development - All platforms as well as cross-platorm - Working on existing code bases or setting a project up from scratch - Debugging pesky and hard-to-track issues in your code base - Optimizing existing applications for performance, memory use, maintainability - Removing code smell and cleaning up/updating legacy code (the oldest so far was C code from 1995, can you beat that?) - API design and integration, including AI integration - Developing tests, from encompassing unit testing to full E2E tests where applicable - Setup of automated build servers Programming languages and tools: - C/C++ Ecosystem: C, C++, Qt, QML, wxWidgets, GTK, boost, valgrind, ImGui, ZeroMQ - Java Ecosystem: Java, Spring, Apache, Gradle, Maven, Kotlin - Python Ecosystem: Python, Flask, Django, NumPy, Plotly, Dash, PyCharm, PyQt, Matplotlib, Selenium, Pytest - JavaScript/Web Ecosystem: JavaScript, TypeScript, Vue, React, Node.js, Next.js, three.js - PHP Ecosystem: PHP, Laravel, CakePHP, Drupal - Other Languages/Technologies: C#, Flutter, bash, Godot, GDScript, Unity, Unreal Engine and more!

I am a dedicated software developer with 7+ years of professional experience in IT companies, now specializing in AI-powered applications, RAG systems, and full-stack development. I combine strong software engineering fundamentals with modern AI/LLM integrations to build practical, production-ready solutions. My passion for problem-solving drives me to design scalable systems that solve real business problems, whether through traditional full-stack development or AI-enhanced applications using LLMs and Retrieval-Augmented Generation (RAG). ✅ What I Offer 🤖 AI / GenAI / RAG Solutions I design and implement LLM-powered applications that turn business data into intelligent systems: ✅ RAG-based chatbots (documents, PDFs, internal knowledge bases) ✅ LLM integrations (OpenAI-style APIs, embeddings, prompt engineering) ✅ Semantic search & knowledge retrieval using vector databases ✅ AI-assisted automation for workflows and decision support I focus on accuracy, latency, and cost optimization, ensuring AI systems are reliable and production-ready. ✅ Full-Stack Development Proficient in building robust and scalable applications using React.js (frontend) and Node.js (backend). I ensure seamless AI + backend integration with clean APIs and secure architectures. ✅ Frontend Expertise Experienced in developing modern, intuitive user interfaces using React.js, TypeScript, jQuery, and Bootstrap. I build dashboards, AI chat interfaces, and data-driven UIs with excellent UX. ✅ Backend & API Expertise Skilled in designing secure, high-performance APIs using Node.js and .NET. AI orchestration layers RAG pipelines Authentication & authorization Scalable microservice-style architectures ☁️ Cloud & AI Infrastructure Proficient in deploying AI-enabled applications on AWS and Microsoft Azure: ✅ AWS (Lambda, S3, Cognito, cloud deployments) ✅ Secure AI API integrations ✅ Scalable backend + AI workloads 🔁 Agile Development Strong background in Agile/Scrum, collaborating with product owners, designers, and QA to deliver iterative, business-aligned features, including AI proof-of-concepts and MVPs. ✅ Key Projects (Relevant to AI & RAG) 🤖 AI-Enhanced Marketing Automation Platform Integrated machine learning algorithms to analyze live Facebook marketing data Automated demographic targeting decisions Built full-stack system using .NET backend and JavaScript frontend 🤖 Data Centralization & Intelligent Monitoring Platform Designed cloud-based data pipelines (Node.js + AWS) Built systems monitoring client machines 24/7 Architecture suitable for future AI analytics & anomaly detection 🧠 Medical Data Acquisition Software Worked on high-precision medical software for functional brain studies Strong emphasis on data correctness, testing, and reliability Ideal foundation for AI-driven medical analytics ✅ Technical Skills (AI-Focused) 🤖 AI / LLM / RAG Retrieval-Augmented Generation (RAG) LLM API integrations Embeddings & semantic search Prompt engineering AI-powered chatbots & assistants ✅ Programming Languages TypeScript, JavaScript, Python, C#, SQL, HTML, CSS ✅ Frontend React.js, TypeScript, JavaScript, Bootstrap, jQuery ✅ Backend Node.js, .NET MVC, .NET Web API, Entity Framework ☁️ Cloud & DevOps AWS, Microsoft Azure, GitLab, Jenkins, Jira I am passionate about bridging traditional software engineering with modern AI, helping businesses move from ideas to real, working AI-powered products. ✅ If you need AI chatbots, RAG systems, LLM integrations, or full-stack AI applications, let’s connect and build something impactful.

I am a Senior Developer having ✔️13+ years of software development experience including ✔️6+ years of Backend experience in C# ASP.NET Core, Web API & REST API Backend Services ✔️6+ years of Full stack experience in C# ASP.NET (Web Forms, MVC, Core) Web Applications ✔️6+ years of Desktop experience in C# Core WinForms, WPF Windows, Visual Basic & Reports 🎯 10+ Successful Upwork Projects ⏱ 250+ Upwork Hours Completed 👉 13+ Years Software Experience with USA, UK, Belgium, Australian & Sri Lankan Clients 👉 BTech Eng (Hon) in Computer Engineering ► TECHNICAL SKILLS ✔️ Backend [C#, .NET 9.0, ASP.NET Core, Web API, REST API, API Integration, Swagger, Node.js] ✔️ Frontend [ASP.NET Core MVC, Razor Pages, JavaScript, jQuery, HTML, CSS, Bootstrap] ✔️ Desktop [C#, .NET 9.0 Desktop Application (WinForms, WPF), Visual Basic, Crystal & RDLC Reports] ✔️ Databases [SQL Server 2022, Database Design, Stored Procedures, MySQL, PostgreSQL, MongoDB] ✔️ Design [Clean Architecture, MVC, Microservices, N-tire, Dependency Injection, Factory, Service/Repository, Request/Response patterns, DTO, SOLID, OOD, DDD, EF Code First, LINQ, AutoMapper, TDD, Agile, Waterfall] ✔️ Deploy [GIT Version control, Bitbucket, CI/CD Pipelines, Docker, Azure, AWS] ✔️ Quality Standards [Clean Code, Code Review, Unit Testing, Testing, Documentation, UML, Jira] ✔️ LLMs and Tools [Claude, GPT, Cursor AI, GitHub Copilot] ✔️ Electrical [Theoretical & Practical knowledge of electronics, electrical systems & power] ► SOFT SKILLS: ✔️ Analytical Problem Solving, Self-Motivation, Effective Communication ✔️ Time Manage, Teamwork, Leadership, Emotional intelligence (EQ) ► WORK EXPERIENCE 🎯 2019 - Now | Freelance Developer | Remote ✅ HR application for multiple companies (C# ASP.NET Core MVC & Web API) ✅ Successfully analyzed requirements, designed solutions & managed deployments on an HR system. ✅ Contributed to full-stack developments and testing with a team. Performed code reviews. ✅ • Utilized C#.NET 8.0, ASP.NET Core MVC, Web API, Razor Pages, Microsoft Identity, SQL Server 2022, jQuery, LINQ, RDLC Reports, EF, Clean Architecture, Dependency Injection, API Integration, HTML, CSS, DTO, SOLID, OOD, DDD, LINQ, AutoMapper, Agile ✅ Streamlined development processes with GIT, Bitbucket, CD/CD Pipelines, Azure integrations & Agile. 🎯 Software Engineer | January 2018 - December 2018 | Pulztec | Sri Lanka - On-site ✅ AI-driven digital human application for a premier bank in Sri Lanka (C# WPF & ASP.NET Web API) ✅ Contributed to WPF developments and backend developments with a team. ✅ Utilized C#, WPF, MVVM, MySQL, Web API, Artificial Intelligence, Google Speech API, & multithreading. 🎯 Senior Software Engineer | March 2017 - December 2017 | Jigsaw | Sri Lanka - On-site ✅ Backend services for a taxi-hiring Mobile App (node.js & MongoDB) ✅ Contributed to the backend design and development with a team. ✅ Utilized node.js, MongoDB, MySQL, REST API, JSON, Postman, OOD, multitier, GIT, Jira, and Heroku. 🎯 Senior Software Engineer | January 2007 - 2016 | Zeropoint | Sri Lanka - On-site & Remote ✅ During my nine years with this company, I worked on several projects in various capacities. ✅ Between 2013 and 2016, I was a Developer, Requirement Analyst, Designer and Team Leader on the projects of developing an HR Management System and Factory Management System for a garment manufacturer with clients based locally and overseas. ✅ I utilized C# ASP.NET Web Forms, SQL Server, Stored Procedures, Crystal Reports and GIT. ✅ Between 2011 and 2012, I worked as a Developer, Requirement Analyst and Designer on a Medical Care Management System in Belgium. ✅ Technologies utilized included C#.NET WinForms, Multi-tier, SQL Server, and Stored Procedures. ✅ In 2010, I was a Developer, Designer and Team Leader on a Wholesale Distribution System in Belgium. ✅ Technologies utilized on this project included C#.NET WinForms, Multi-tier, and SQL Server. ✅ Between 2007 and 2009, I was involved with developing a Warehouse Management System in Belgium. I worked as Developer, Designer and Team Leader. ✅ Technologies utilized included C#.NET WinForms, Multi-tier, SQL Server and ADO.NET.

🚀 12+ Years of Mobile App Development (Android, iOS, Xamarin C#, Flutter) 💻 30+ Apps with 20M+ Downloads 🤖 AI Assisted Programming + Vibe Code to Ship your MVP Faster 📙 Author - "From Campus to Code" 🔥 Worked at Forbes 500 and Fortune 1000 Companies About Me: Hi, I'm Nelson J., and I'm glad that you are here to turn your DREAM APP into reality. 🤩 I started programming in 2013 and have been using Flutter and Dart since 2019. I have been leveraging AI to ship fast using Claude Code, Cursor, Github CoPilot, Lovable AI etc. About SoloBits: I run SoloBits as a solo entrepreneur or solopreneur in Finland in the EU. Where I provide Software Development Services across the Globe. The primary focus is to ship Tailored High Quality App while taking away all your Headache and Taking Ownership of the Tech and Shipping Fast by leveraging my experience and latest AI tech. I have worked on 30+ Apps for STARTUPS, FORBES 500 & FORTUNE 1000 Companies 🚀 in the USA, Finland, New Zealand, Malaysia and across the globe. 🔥 ✅ Here's what sets me apart: - Over-delivering: I deliver marketable and maintainable products that I take pride in. - Understanding beyond Development: With my experience working for both large and small companies, I have collaborated with various departments, gaining a deep understanding of their needs and mindsets. - Tech Stuff: TDD (Test-Driven Development), SOLID principles, KISS (Keep It Simple, Stupid), YAGNI (You Ain't Gonna Need It) and All Other Acronyms + my “Pizza Philosophy” which I can explain on call 😉 💻 Here is what I do: - Flutter/Dart - iOS(Swift) & Android(Java, Kotlin) & Web Portals (Flutter/Dart, Wordpress) & Desktop App (Flutter/Dart, UWP C#) - No/Low-Code + AI - React - REST/GraphQL APIs - Firebase - Payment integrations - Ads integrations - AI/GPT/Bard/Vertex/PaLM/OpenAI APIs - Vibe Code and AI Assisted Programming - ... & more My goal is to not just deliver you CODE, everyone can do that. I am here to deliver you a PRODUCT that is MARKETABLE and MAINTAINABLE. 💻 The reality is that MARKET NEED 📈 is almost always different from our vision, and I am here to SUPPORT you through that too. Need to PIVOT or make some changes? I am here. Let me take care of the Technical Jargon and you can focus on things that are more important, like BUSINESS. 🙂 Let's discuss your idea over an E-COFFEE. 🙂 --- Industries I Cover: Education, Automotive, Fintech / Finance and Banking, Nature/Wildlife, Media and Publishing, Retail, Marketplace, Medical Dashboard, Utilities, Lifestyle, Advertising, Manufacturing, Dating, Hospitality, Asset Management, Logistics, Wellness, Entertainment, Cryptocurrency, Human Resources, LegalTech, Sports and Fitness, Travel and Tourism, Rental, Ecology, Business Innovations, Real Estate, Food Delivery, Fashion, Marketing, Healthcare, Navigation, Non-Profit, Transport, E-learning. Highlighted Skills: User-friendly Interface, Flutter, Architecture and RESTful APIs, AI Assisted programming, Project Management and Collaboration Tools (ClickUp, Jira, Trello), Mobile App Development, Blockchain and NFT, MVP SAAS, Database Design and Implementation (MongoDB, Firebase), Excellent Communication, QR Code Scanner, Develop and Maintain, Version Control Systems (Git, GitHub), ERP, Payment Gateway, Prototype, User Interface Design, Android, Chatbots, Deployment to Cloud Platforms (AWS), Test-driven Development, ChatGPT and Artificial Intelligence, Fix, Transform, Optimizing, Security Technologies, Payment Integration (Stripe), Documentation and Code Commenting, Web App Development, Agile Methodologies (Scrum, Kanban), GPS and Mapping, Create, Integrate Third-party APIs, Business-friendly Custom Development, CRM, Website and Web App from Scratch, Start-Up, Enhance, Implement, Marketing, Rebuild, Upgrade, Modernize, Vibe Code, Dart, iOS, Responsive and Mobile-first Design, E-commerce Solutions, SEO and Maintenance, Assist, Collaborate, High Proficiency, Great Problem-solving, Solution-oriented Delivery, Ensure Quality.