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I build modern, scalable, and business-focused software solutions across Web, Mobile, Desktop, and Backend systems using the Microsoft ecosystem. From elegant user experiences to reliable back-end architecture, I help startups, businesses, and growing products transform ideas into production-ready applications that are fast, maintainable, and built for long-term growth. Whether you need a custom platform, API integration, business portal, CMS website, enterprise dashboard, or cross-platform application — I focus on delivering software that solves real business problems. 🎯 Core Expertise 🔹 C# .NET Development 🔹 ASP.NET Core Web Applications 🔹 RESTful API Development 🔹 Umbraco CMS Development & Customization 🔹 .NET MAUI Cross-Platform Applications 🔹 WPF Desktop Applications 🔹 MVVM Architecture 🔹 Entity Framework Core 🔹 SQL Server & Database Design 🔹 Azure Cloud Solutions 🔹 Authentication & Authorization 🔹 Microservices Architecture 🔹 Third-Party API Integration 🔹 Performance Optimization 🔹 Clean Architecture & SOLID Principles 💻 DEVELOPMENT STACK 🔷 Languages ✔ C# ✔ SQL ✔ JavaScript ✔ TypeScript ✔ HTML5 / CSS3 ✔ XAML 🔷 Frameworks & Platforms ⚙ ASP.NET Core ⚙ .NET 5 / .NET 6 / .NET 8 ⚙ WPF ⚙ WinForms ⚙ .NET MAUI ⚙ Umbraco CMS ⚙ Entity Framework Core 🔷 Front-End 🎨 Razor Pages 🎨 Blazor 🎨 Angular 🎨 Vue.js 🎨 Bootstrap 🎨 Responsive UI Design 🔷 Databases 🗄 SQL Server 🗄 PostgreSQL 🗄 MySQL 🗄 SQLite 🔷 Tools 🛠 Visual Studio 🛠 Git 🛠 GitHub 🛠 Azure DevOps 🛠 Postman 🛠 Docker ☁️ Cloud & DevOps 🔸 Azure App Services 🔸 Azure Storage 🔸 Azure Functions 🔸 Azure SQL Database 🔸 Azure Key Vault 🔸 CI/CD Pipelines 🔸 GitHub Actions 🔸 Azure DevOps Pipelines 🔸 Docker Containerization 🔸 Automated Deployments 🔸 Monitoring & Logging 🔐 Security & Authentication ✔️ ASP.NET Identity ✔️ JWT Authentication ✔️ OAuth 2.0 ✔️ Role-Based Access Control ✔️ Secure API Architecture ✔️ Data Protection & Encryption ⚙️ Solutions I Build ✅ Enterprise Web Applications ✅ SaaS Platforms ✅ Custom Business Management Systems ✅ CRM & ERP Solutions ✅ REST APIs & Backend Services ✅ Mobile Applications (.NET MAUI) ✅ Desktop Applications (WPF) ✅ CMS Platforms (Umbraco) ✅ E-Commerce Integrations ✅ Real-Time Applications ✅ Reporting & Analytics Systems ✅ Legacy System Modernization 🚀 Professional Strengths 💠 Full-Stack .NET Expertise 💠 Strong Software Architecture Skills 💠 Clean & Maintainable Code 💠 Business-Oriented Development 💠 Fast Learning & Problem Solving 💠 Excellent Communication 💠 Reliable Delivery & Long-Term Support 💠 Independent Freelancer — No Agency 💎 WHY CLIENTS WORK WITH ME ⭐ Business-Oriented Development ⭐ Production-Ready Solutions ⭐ Long-Term Maintainability ⭐ Scalable Architecture ⭐ Transparent Communication ⭐ Reliable Deadlines ⭐ Quality-First Development 🔑 RELEVANT KEYWORDS C# Developer, .NET Developer, ASP.NET Core, .NET MAUI, WPF Developer, Backend Developer, API Developer, REST API, Entity Framework Core, SQL Server, Azure Developer, Cloud Solutions, Umbraco Developer, CMS Development, Enterprise Software Development, Cross-Platform Mobile Development, Desktop Application Development, SaaS Development, Web Application Development, Microservices, Clean Architecture, Software Architecture, Full Stack .NET Developer. 🔒 I’m a passionate, independent developer, not an agency. 🕒 Available 40+ hours/week, flexible across time zones. 🌍 Let's build something exceptional together! 💪 📩 Click "Invite" or "Message" and let's discuss how I can help bring your project to life. Your idea + my expertise = success. 🚀

Hey there! I’m a full stack web and software developer with extensive experience working directly with clients and delivering solid, well-thought-out solutions, not just quick fixes. Throughout my career, I’ve tackled diverse projects and provided a wide range of services and solutions, gaining the knowledge and skills needed to deliver reliable, seamless, scalable, efficient, and high-quality work. Why choose me? ‣ I have strong knowledge in both frontend and backend development. ‣ I provide customized and tailored solutions that fit each project’s unique requirements. ‣ I make sure designs and specifications are met, and I deliver clean work with exceptional quality. ‣ I’m committed to meeting deadlines and achieving milestones while maintaining high standards. ‣ I prioritize transparent communication to stay aligned with your objectives throughout the project lifecycle. I’m always eager to learn new technologies and skills, and I adapt quickly to any project requirements. My goal is to understand not just the technical side, but also the business context, so I can deliver solutions that truly make an impact. 💻 Technical Expertise Search, Content & Media Integrations: • Algolia Search API implementation and integration, data indexing and synchronization (WordPress → Algolia) and Search indices and query optimization • YouTube Data API integration, video content synchronization and metadata retrieval WordPress: • Website development and customization • Custom plugin development & feature extensions • eCommerce implementation and setup • WooCommerce • Booking and appointment scheduling systems • Payment gateway integration (Stripe, PayPal, etc.) • Forms integration (WPForms, Gravity Forms, Contact Form 7, Jotform, Ninja Forms) • Elementor, Divi, Oxygen, Beaver Builder, Visual Composer, WPBakery, Gutenberg/Block Editor, custom blocks • Third-party API integrations (REST, CRM, SaaS platforms) • Website speed and performance optimization • On-page SEO optimization • Cache configuration and management (WP Rocket, LiteSpeed Cache, W3 Total Cache) • Debugging and troubleshooting • Plugins and themes: ACF (Advanced Custom Fields), Meta Box, Wordfence, iThemes Security, HivePress, GeoDirectory, LearnPress, LearnDash, Astra, GeneratePress, Elegant Themes, Avada, Thrive Themes Frontend: HTML5, CSS3, JavaScript, React, Astro, Vue, Angular, Backbone, Bootstrap CMS: WordPress, Joomla, Drupal, Magento, Shopify, Wix PHP: Laravel, CodeIgniter, Yii, Symfony, CakePHP Java: Java 2 Platform, Enterprise Edition Spring Framework JavaServer Pages Java Servlets Java API for RESTful Web Services Java API for JSON Java API for XML SSO & authentication: SAML, Google Workspace, Firebase & cloud-based integrations JavaScript Libraries & Frameworks: jQuery, React, Highcharts, Chart.js, D3.js, Underscore, Next.js, Angular, Backbone API Integrations: Payments • Stripe, PayPal • Square • Authorize.Net eCommerce • Shopify API • WooCommerce REST API Google and Microsoft ecosystems • Google APIs (Sheets, Drive, Calendar, Gmail) • Microsoft Graph (Outlook, Teams, OneDrive) Marketing and CRM API integrations • HubSpot API • Mailchimp API • ActiveCampaign API • Constant Contact API • Klaviyo API Automation tools • Zapier • Make (formerly Integromat) Authentication & SSO • OAuth 2.0 • OpenID Connect • SAML Email Marketing & Automation • ConvertKit • Mailchimp • Brevo • AWeber • ActiveCampaign • Constant Contact • SendGrid • Calendly • Klaviyo CRM, Support & Live Chat • HubSpot • Zoho (CRM) • Zendesk Business and Industry Platforms • AppFolio (API integration + platform admin) • Motion (API integration + dashboard setup/usage) • MetaPulse (API integration + dashboard reporting) Project / Task Management • Asana • Trello • Monday (dot)com • Basecamp • Notion Web & Integration Skills REST API, Webhooks, 3rd-party API integrations, SSO Dev Workflow & Collaboration Git, GitHub, Bitbucket, Slack Website & Server Management • Performance optimization • Troubleshooting & debugging • Site migrations (staging → production, server moves) • Security hardening and malware cleanup • DNS & SSL setup • CDN, caching rules • Server stack: Apache, Nginx, cPanel, Plesk Hosting / Cloud Platforms • DigitalOcean, AWS, Google Cloud, WP Engine, Kinsta • GoDaddy, BlueHost, HostGator, SiteGround, Hostinger, Namecheap, A2Hosting, DreamHost I know outsourcing can sometimes feel risky, but I make it simple. I listen carefully, ask the right questions, and then deliver work that’s dependable and professional. My goal is always the same: make your project stress-free while helping you achieve results that matter for your business. Let’s work together to bring your ideas to life—whether that’s building something from scratch, fixing existing issues, or scaling your platform to the next level.

💻 Full Stack Developer | MS Access, VBA, SQL Server, Excel, Azure, React, Firebase 🌟 Professional Summary With over 25 years of experience, I specialize in building and maintaining applications that help businesses operate more efficiently. My expertise ranges from legacy desktop systems to modern web and mobile solutions, always focused on solving real business problems through automation, scalability, and reliable support. 💡 How I Can Help ✔ Workflow Automation: Streamline operations using MS Access, Excel VBA, and SQL Server ✔ Legacy System Modernization: Upgrade VB6, VB.NET, and ASP applications to modern platforms ✔ Database & System Integration: Build and integrate ERP, CRM, and APIs for seamless workflows ✔ Web & Mobile Development: Develop responsive applications using React, Next.js, and Firebase ✔ Business Intelligence: Create dashboards and reports using Power BI for actionable insights ✔ Enterprise Tools Support: Enhance productivity using Azure, SharePoint, PowerApps, and Dataverse 💼 What I Do Best ✔ Microsoft Access Database Development (Forms, Queries, Reports) ✔ VBA Automation (eliminating repetitive manual work) ✔ Order Management & Inventory Systems ✔ Data Cleanup, Normalization, and Optimization ✔ SQL Server Integration & Backend Scaling ✔ Fixing slow or broken Access databases ✔ Workflow Automation for real-world business processes 🔥 Real Business Impact I don’t just build databases—I solve business problems. I’ve worked with clients for 4+ years on long-term engagements, helping them: Reduce manual data entry by up to 70% Improve order processing speed Eliminate duplicate and inconsistent data Maintain reliable and scalable systems ⭐ Client Feedback (5.0 Rating) “Roy has been great to work with in providing a monthly service for our company. He has worked with us on several projects over the last four years. He is very knowledgeable and responsive despite the time difference.” “Our company has worked with Roy for 4 years on various projects. He consistently understands requirements and delivers results as expected.” “Roy is easy to work with and highly skilled at solving application-related issues. He quickly understood my challenges and provided effective solutions.” “Roy is very responsive and easy to work with. He completes projects quickly and efficiently.” “I had the pleasure of working with Roy on an existing Access application. His expertise, patience, and clear communication exceeded my expectations. He explained complex concepts clearly and ensured the system worked exactly as needed.” 🚀 Proven Results ✅ Designed an accounting system used by 158+ active clients since 2006 ✅ Delivered mission-critical systems including POS, HRIS, payroll, hotel, and restaurant systems ✅ Developed AQUABIZ, a water refilling business app with real-time inventory and sales tracking 🧠 Why Clients Choose Me ✔ Specialized in Microsoft Access (not a generalist) ✔ Strong understanding of real business workflows ✔ Clear communication and dependable delivery ✔ Focus on long-term, scalable solutions ⚙️ Typical Projects I Handle Food / Retail Order Management Systems Inventory Tracking Systems CRM & Data Management Tools Reporting Dashboards Legacy Access System Optimization Access + Website / API Integration 💬 Let’s Work Together If your current system is: ❌ Slow ❌ Manual ❌ Error-prone ❌ Difficult to manage I can help you transform it into a fast, automated, and reliable system. Let’s discuss your project 👍

Over +6 years of hands-on experience in Web Development, specializing in crafting high-performance, user-centric web applications using the MERN stack and modern frontend technologies. Skilled in building scalable, secure, and lightning-fast digital solutions that solve real-world problems and deliver real business value. Whether launching a new product or scaling an existing platform, expect clean, maintainable, and elegant code delivered on time and with precision. 🚀 What You Can Expect: ✨ Pixel-perfect, beautifully responsive UIs ⚡ Lightning-fast performance to boost conversions 🔐 Secure, scalable backends for long-term growth 📱 Seamlessly mobile-optimized solutions 💯 100% commitment to satisfaction and quality 🏆 Tech Stack & Expertise 🌐 Front-End React.js, Next.js – Dynamic, performant SPAs and SSR applications TypeScript, JavaScript (ES6+) – Strongly typed, scalable codebases Redux Toolkit, React Query – Advanced state and server-state management Tailwind CSS, Material UI, ShadCn-UI, Chakra UI, Ant Design – Modern, responsive UIs HTML5, CSS3, SASS/SCSS – Clean, accessible markup and styling Formik, React Hook Form, Yup – Modern form handling and validation ⚙️ Back-End Node.js, Express.js – Scalable backend and REST API development MongoDB, PostgreSQL – Flexible and efficient data storage Prisma ORM – Type-safe queries and smooth DB management JWT, OAuth – Secure authentication systems Axios – Reliable API communication 🧩 Architecture & Dev Tools Atomic Design, Storybook – Component-based development Git, GitHub, GitLab, Bitbucket – Version control and team collaboration Postman – API testing and integration Lodash, Day.js/Moment.js, Framer Motion, GSAP – Utility and animation libraries 🎨 Services Offered ✅ Full Website & Web App Development ✅ Figma to React/Next.js Conversion ✅ Landing Pages & SaaS Dashboards ✅ Custom API Integration & Backend Architecture ✅ Code Refactoring & Performance Optimization ✅ Ongoing Maintenance & Feature Enhancements 🧠 Why Choose This Service? ✅ 6+ years of professional web development experience ✅ Proficient in both frontend and backend technologies ✅ Strong communication and project ownership ✅ Clean, modular, and scalable codebase delivery ✅ Experience with startups, SMBs, and enterprise-level systems 💼 Industries Served: 🧘 Health & Wellness | 👕 Fashion | 🛍️ Retail | 🍔 Food & Beverage | 📱 SaaS | 🎮 Tech Startups | 📚 Education | 🛒 E-commerce (custom-built) 📩 Let’s build something exceptional. From idea to execution, the goal is to deliver fast, secure, and beautiful web experiences that scale with your business. Warm regards, Von Ojastro Full Stack React.js / Next.js Developer | MERN Stack Specialist 5+ Years of Experience | Remote-Friendly | Freelancer

Senior C#/.NET Core developer with 7+ years of experience building enterprise web applications, automation systems, REST APIs, and business platforms. Experienced in healthcare, insurance, finance, and business process automation with a strong focus on scalable backend systems and production reliability. What I can help you with: • Full Stack Web Development • C# / .NET / .NET Core Development • REST API Development & Integration • MSSQL Database Design & Optimization • Business Process Automation • Reporting & Admin Systems • Bug Fixing & Legacy System Support • Production Deployment & Maintenance Tech Stack: C#, .NET, .NET Core, JavaScript, TypeScript, MSSQL, Entity Framework, Dapper, REST API, Git, Jenkins, SSRS, SSIS Why clients work with me: • Strong communication • Clean and maintainable code • Enterprise development experience • Reliable delivery • Fast learner and problem solver • Experience leading deployments in DEV, UAT, and Production I focus on building stable, scalable, and business-driven solutions that help clients save time and improve operations. Let’s discuss your project.

Hey, I'm an AI full-stack developer who actually gets stuff into production without the usual headaches. Look, I've seen it too many times: teams build a shiny LLM demo that wows everyone in the first meeting, then reality hits — hallucinations creep in, responses take forever, the frontend feels tacked on, or costs skyrocket. Suddenly that "game-changer" sits unused. I help fix that mess and build AI tools people actually use every day. What I focus on: Solid RAG systems that don't hallucinate (or at least do it way less) — using LangChain, Pinecone/Weaviate, rerankers, eval loops, the works. Multi-agent setups and autonomous workflows that handle real complexity — think agents talking to each other, calling tools, remembering context, and looping in humans only when needed. In one project I cut manual grunt work by 80–90%. Full builds: clean Next.js + Tailwind/TypeScript frontends paired with FastAPI/Python backends, Postgres, AWS/GCP deployment — from quick MVP to something that scales without breaking. Smart LLM integration: OpenAI, Claude, Grok, Llama 3/3.1 — whichever fits best. I optimize prompts, cut latency and costs, and wrap everything securely. My recent big one was HyeAero.AI (check the portfolio): end-to-end RAG + agents on FastAPI, automated 80–90% of tedious data tasks so the team could stop copy-pasting and start thinking strategically. It shipped reliably and still runs smoothly. I'm picky about projects — I only take ones where I can make a real, measurable difference (time saved, better accuracy, lower bills). If that's you, shoot me a message or invite. Tell me what's broken or what you're trying to build — happy to hop on a quick call and sketch out the fastest realistic path forward. Let's make your AI thing actually work. Refer: Philippines-based freelancer (UTC+8 / Manila) – Fully available in US Eastern Time. I adjust my schedule daily to match Eastern business hours.