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**Need to connect an LLM to your real tools - email, databases, APIs, internal systems - and have it work reliably in production? That's what I build.** I've shipped my own MCP (Model Context Protocol) server that gives Claude live access to 9 functional domains - email, git, filesystem, calendars, contacts, scheduling - and I run it in production every day. I've also built a full AI content pipeline of Claude Code agents that publish directly to a live CMS. Behind that is nearly 30 years as a software architect and full-stack engineer - and I still write code every day. So your AI integration sits on a backend that won't fall over. My professional background: 18 years as Technology Architect at Old Republic Home Protection, where I designed and built two enterprise platforms from greenfield. One was a microservices SOA system (Java/Spring Boot, Angular, RabbitMQ, SQL Server). The other was a cloud-first Azure platform (Docker, Azure Service Bus, Cosmos DB). I led a development team, ran CI/CD, introduced Security-by-Design and TDD, and was the person they called when projects went sideways. Before that: Senior Application Architect at MultiPlan in New York, building healthcare claims systems at scale (700+ users, 1.2M+ provider records). Since 2024, I've been building and running my own software products - several are live and in production: - Itty - A branded link-shortening SaaS with custom domains, click analytics, multi-user management, and Stripe billing. Built on Java 21 / Spring Boot 4 / Angular 21. - Klass Paperless - A digital template store for reMarkable tablets. Includes a headless-browser PDF generation pipeline, Stripe checkout, AWS S3 storage, and an Angular storefront. - Klass Video - A 4K AI video restoration and upscaling service. - Klass Wiki - A technical reference and blog I publish covering Spring Boot, SQL Server, Angular, Linux, and AI development. - Klass CMS - A multi-tenant CMS platform serving 8+ distinct websites from a single Spring Boot deployment. Configuration-driven interceptor pipeline chains honeypots, AI spam-detection, landing-page tracking, S3 presigned redirects, Stripe checkout, and mailing-list signups. Built on Java 21 / Spring Boot 3.5 / Spring AI / Angular 21. - Klass CRM - A native CRM and personal productivity app built with SwiftUI and SwiftData for macOS 15+ and iOS 18+. Full end-to-end encryption (Argon2id + AES-256-GCM), CloudKit sync, Markdown I/O, and a modular architecture across CRM, Finance, Planner, Notes, and Templates modules. I also built my own AI agent infrastructure: a Spring AI MCP server that integrates email (IMAP/SMTP), git, CardDAV contacts, CalDAV scheduling, and filesystem operations for Claude-based automation. On top of that I built an AI content marketing pipeline - custom Claude Code agents that generate weekly LinkedIn posts, blog articles, and social content from a single subject prompt, enforcing brand voice and publishing directly to the CMS. **What I work in:** - Backend: Java, Spring Boot (through v4), Grails/Groovy, REST APIs, microservices, Spring Security, JWT, OAuth 2.0 - Frontend: Angular (v17-21), TypeScript, React, Next.js - Native desktop/mobile: Swift, SwiftUI, SwiftData (macOS/iOS); JavaFX; Tauri 2 (Angular + Rust cross-platform desktop) - Databases: SQL Server, SQLite, MySQL, Oracle (PL/SQL), Azure Cosmos DB, MongoDB - Cloud: Azure (VMs, Spring Cloud, Service Bus, Containers, Cosmos DB, Blob Storage), AWS S3, CloudKit, Backblaze B2, Cloudflare R2 - AI/LLM: Spring AI, Anthropic Claude API, Azure OpenAI (including Assistants API), MCP server implementation, Claude Code agent pipelines - Integrations: Stripe, SendGrid, Okta/SAML, Telegram Bot API, Etsy, IVR/phone APIs, EDI - Tools: Docker, Azure Pipelines, Gradle, Quartz Scheduler, Selenium/WebDriverManager, JUnit 5, XCTest I work across the full stack and adapt to what the project needs. I work independently without hand-holding, communicate clearly with non-technical stakeholders, and deliver. If you need an MCP server built, an LLM wired into your existing systems, or a senior engineer to take a stalled project and just ship it, I'd be glad to talk.

As a dedicated Full Stack Software Engineer, I specialize in Ruby on Rails and React, with a proven track record of delivering high-quality solutions. My experience spans across various projects, including updating and maintaining Ruby on Rails applications hosted on Heroku, and collaborating with teams to manage backlogs using tools like Linear. I am proficient in Java, JSON, and have a strong foundation in web development technologies such as JavaScript, HTML, CSS, and Bootstrap. I have successfully tackled challenges such as cleaning up and packaging Java code, updating neglected applications, and setting up local development environments on M1-based Macs. My approach is rooted in responsibility, good judgment, and effective time management, ensuring that I consistently meet project deadlines and exceed client expectations. I am passionate about leveraging my skills to help companies achieve their goals and am always eager to take on new challenges that allow me to grow and contribute to innovative projects.

I am a results-driven Full Stack Software Developer with a strong focus on building scalable, high-performance web applications using C#, ASP.NET, RESTful APIs, and the React framework. I bring a balanced blend of backend engineering, modern frontend development, and thoughtful design, enabling me to deliver complete, production-ready solutions from concept to deployment. On the backend, I specialize in ASP.NET and C#, designing clean, maintainable architectures that emphasize performance, security, and scalability. I have extensive experience building and consuming RESTful APIs, implementing authentication and authorization flows, managing data persistence, and integrating third-party services. I value well-structured code, clear separation of concerns, and adherence to best practices such as SOLID principles, enabling systems to evolve without unnecessary complexity. On the frontend, I work extensively with React, building responsive, dynamic user interfaces that prioritize usability and performance. I am comfortable working with modern component-based architectures, state management patterns, and API-driven UI workflows. I focus on writing reusable components, maintaining consistent design systems, and ensuring that applications remain intuitive and accessible across devices and screen sizes. In addition to development, I bring extensive UX/UI experience to every project. I strongly believe that great software is not only functional but also intuitive and visually coherent. I approach interface design with a user-centered mindset, considering usability, clarity, and interaction flow from the earliest stages of development. This allows me to bridge the gap between design and engineering, ensuring that what is designed can be implemented efficiently and accurately. I am also highly skilled in vector art design using SVG, enabling me to create lightweight, scalable, and visually precise graphics for modern web applications. Whether designing custom icons, illustrations, UI elements, or interactive graphics, I leverage SVG to enhance performance while maintaining visual clarity at any resolution. This skill allows me to reduce reliance on external assets and deliver more cohesive, optimized user experiences. I thrive in environments where problem-solving, creativity, and technical precision intersect. I enjoy translating complex requirements into elegant solutions, collaborating across disciplines, and continuously refining both code quality and user experience. I am comfortable working independently or as part of a team, and I value clear communication, thoughtful documentation, and continuous learning. Overall, I am a developer who combines strong engineering fundamentals, modern frontend expertise, and a deep appreciation for design. My goal is to build software that is robust under the hood, intuitive on the surface, and impactful for the people who use it.

I’m a hardworking and detail oriented full-stack web and mobile architect who’s helped companies both small and large maintain their online presence for over a decade. I understand that every customer is different and I can easily adapt to any environment to tailor solutions that fit your needs, whether it’s a small bootstrap startup or a large enterprise. I will work with you one-on-one to create a strategy focused on product delivery, growth, and technical excellence. My specialties include cloud services (e.g. AWS, Azure, Google Cloud), real-time systems, business intelligence, big data, enterprise web apps, scalability, education, and open source software. My full stack experience includes Node, and Express/Nest/Hapi/Loopback, and MongoDB as well as more traditional technologies like PHP, ASP.NET, and Python. Additionally, I have extensive knowledge of front-end JavaScript and browser APIs as well as significant experience with popular frameworks and libraries like React, Vue and Redux. I’m a self starter and I love working on new and challenging projects that push me to my limits and allow me to learn and grow.

Upwork Expert-Vetted Talent (Top 1%) Microsoft Certified AI Engineer (Certification number: DEB32A-P5EE8C) Fullstack Developer | Software Engineer | Solutions Architect | AI Engineer | UI/UX Designer Tech Stacks Languages & Frameworks: C / C++ / C# / .NET / Unity / Java / JavaScript / TypeScript / Python / Rust / PHP / VB Razor Pages / CSS3 / Maven / Spring / Angular 2+ / React.js / Redux / jQuery / HTML5 / JSX / XAML / XML/XSLT / ASP.NET MVC / ASP.NET Core / .NET Framework / DevExpress UI / Spring Framework / Spring Boot / Spring Cloud / JavaFX / QT / QML Databases: MySQL / PostgreSQL / MSSQL / NoSQL / MongoDB / Azure Cosmos DB / Redis / Firebase Realtime Database DevOps & Containerization: Docker / Kubernetes / Azure DevOps AI & Machine Learning: Machine Learning / Deep Learning / TensorFlow / PyTorch / MATLAB / Azure Cognitive Services / Azure OpenAI Services / Azure AI Video Indexer / Azure AI Prompt Flow / Google Assistant SDK Blockchain Development: Ethereum / Binance Smart Chain / Solana / Stellar / Smart Contract Development / IoT Blockchain Technologies Additional Tools & Platforms: QuickBooks Online (Intuit) App Development / Shopify App Development Full Stack Development Services App Development: Mobile, Web, and Desktop Applications, Macros & Scripts Blockchain Development: Smart Contract Development and Blockchain Integration for Ethereum, Binance Smart Chain, Solana, and Stellar Algorithmic Trading: Algo Trading Platforms for Stocks and Cryptocurrency Dashboards & Analytics: Custom Dashboards, Metrics, and Business Intelligence Solutions Custom CRM & ERP Systems: Design, Development, and Integration of Customized CRM and ERP Solutions Database Management: Database Design, Optimization, Maintenance, and Integration for MySQL, PostgreSQL, MSSQL, NoSQL, MongoDB, and other leading database systems Software Integrations: Third-Party Software Integration and IT Security Implementations AI & Cognitive Services: Development of Machine Learning, Deep Learning, and Cognitive AI Solutions using Azure AI Stacks (Cognitive Services, OpenAI, Prompt Flow, Video Indexer) and Google AI SDK

Greetings, I'm Aaron, a software engineer with 11 years experience. I am an expert at Java and Spring Boot, while also being well versed in many other languages, JavaScript, NodeJS, PHP, C++. I know web very well, so HTML, CSS, React, and various other frontend tech. The databases I use include MySql, Postgresql, Mariadb, Mongo, Redis, Kafka and others. I work on the following sorts of projects: - Creating REST APIs and developing backends - Database design and implementation, optimizations - Building web apps, both internal and external - Integrations between systems, writing custom integration code - Custom automations, usually in code. - IT work, setting up servers and cloud infrastructure, scalable systems - Anything at all related to Java, Spring Boot, and this ecosystem I can do the entire lifecycle for your software, you just tell me the requirements, I'll get it done.