# Matthew Maas **Full-Stack C# / .NET Engineer | Healthcare · Fintech · AI Systems** Omaha, NE | (402) 957-8844 | mattmaas7@gmail.com | linkedin.com/in/mattmaas --- ## Professional Summary Full-stack software engineer with 8+ years of hands-on C#/.NET development experience building high-performance web applications, RESTful APIs, and enterprise systems across healthcare, financial services, and AI. Proven track record delivering HIPAA- and PCI-DSS-compliant production systems in fast-paced Agile environments. Experienced with modern cloud platforms (Azure, AWS), AI/LLM integration, and telephony communication systems. Passionate about solving complex integration challenges and building impactful technology. --- ## Technical Skills **Languages:** C#, JavaScript, TypeScript, SQL, Python, Java, XAML, HTML/CSS **Frameworks & Libraries:** .NET (Core, Framework, 6/8), ASP.NET Web API, Entity Framework / EF Core, WPF (MVVM), React, Angular, Node.js, Spring Boot **Communications & Telephony:** Twilio Programmable Voice, Azure Communication Services, PSTN connectivity, speech-to-speech pipelines, SIP, telephony integration **Databases & Data:** MS SQL Server, Azure Cosmos DB, Elasticsearch, query tuning, indexing, stored procedures **API & Integration:** RESTful Web Services, Web API, 3rd party API integration, Postman, SoapUI, Fiddler, OpenAI API, webhook orchestration **Testing:** NUnit, xUnit, Jest, Selenium WebDriver, React Testing Library, BDD (Gherkin), unit testing, integration testing **DevOps & Tools:** Azure DevOps (CI/CD pipelines, boards, repos), Git, Docker, Jenkins, Visual Studio, VS Code, Jira **Architecture & Practices:** SOLID design principles, secure coding, OWASP, distributed systems, microservices, event-driven architecture, Agile/Scrum **Compliance:** HIPAA, PCI-DSS (Fortify remediation), HL7, DICOM --- ## Education **University of Nebraska-Lincoln** | Lincoln, NE | Aug 2015 -- Dec 2018 Bachelor of Science in Computer Science | Minor in Mathematics | GPA: 3.6 - Honors: Regents Scholar, Dean's List, CSE Honors Program - Activities: Vice President -- Association for Computing Machinery (ACM), CS Tutor (Data Structures, Algorithms) --- ## Professional Experience ### Independent AI Engineer / Consultant | Remote | Jun 2023 -- Present - Built 80+ production automation workflows (n8n) and 30+ Model Context Protocol (MCP) servers integrating LLMs with business systems, telephony, and data pipelines. - Engineered a real-time voice AI platform (**OpenAI Realtime API + Twilio**) and an autonomous multi-agent orchestration system (TypeScript) with tool use and long-term vector-database memory. - Delivered AI and automation consulting; secured **$14k+ in cloud infrastructure credits** (AWS, Microsoft, Google Cloud, Oracle) to fund product development (EbSnap). --- ### West Coast Wound & Skin Care | Software Engineer | Remote | Apr 2025 -- Aug 2025 - Engineered a full-stack financial reporting and payroll suite in C#/.NET featuring configurable provider rate management, complex backend calculations, and Excel export with pivot tables for detailed auditing. - Built a C# data migration utility to import and synchronize data from a legacy EHR system, ensuring data integrity via validation and transactional support. - Resolved critical backend defects (e.g., patient search) and improved UI/UX by fixing report rendering issues and enhancing cross-module consistency. - Contributed to feature planning and technical design, performing ongoing code maintenance, debugging, and performance optimization across the application. - Enforced HIPAA-compliant data handling: TLS 1.3 encryption, field-level data protection, and automatic audit logging of PHI access. --- ### CAI3p0 | AI Engineer Consultant | Remote | Jan 2025 -- Mar 2025 - Architected and built a voice application platform with Python, Flask, and **Azure Communication Services**, orchestrating AI-driven call transcription, analysis, and routing. - Integrated **Twilio Programmable Voice** for PSTN connectivity with real-time speech-to-speech workflows. - Deployed serverless call processing infrastructure on AWS Lambda and API Gateway. --- ### Fiserv | Software Engineer III (Contract) | Omaha, NE | 2022 - Modernized legacy C# and VB.NET applications targeting .NET Framework 4.8, improving maintainability and resolving security vulnerabilities through Fortify static analysis scans (PCI-DSS compliance). - Configured enterprise telephony and communication systems integrated with Fiserv Core banking platforms for B2B financial services clients. - Facilitated seamless Windows Server upgrade from 2008 to 2016 using PowerShell automation, safeguarding uptime of critical financial applications. --- ### HelpSystems (Fortra) | Software Engineer (Contract) | Remote | Mar 2022 -- Sep 2022 - Enhanced performance and workflows for **Automate** desktop automation software (C#, .NET Core, Entity Framework), a product used by enterprises for business process automation. - Participated in Agile/Scrum ceremonies including daily stand-ups, sprint planning, retrospectives, and peer code reviews. - Authored internal design-to-code starter kit: ESLint, Prettier, Jest, React Testing Library, and Vite CI pipeline integrated into Azure DevOps. --- ### Sound Technologies | Software Engineer | Carlsbad, CA | Jan 2019 -- Nov 2021 - Architected and developed **Smart DR Fusion** medical imaging application (C#, WPF, MVVM, MS SQL Server, Entity Framework), following DICOM standards and streamlining radiologist review workflow. - Led full development lifecycle of **Smart RLT Sport** laser therapy application, now deployed in 5,000+ veterinary clinics worldwide; interfaced with C++ native libraries to control diagnostic hardware. - Redesigned unified UI across 4 diagnostic imaging products, delivering modern touch-friendly interfaces with light/dark themes and multi-language localization support. - Built product documentation portals using React, Docusaurus, and Markdown with Algolia-powered search integration. - Implemented Azure DevOps CI/CD pipelines for automated build, test, and release management across multiple product lines. --- ### Epic Systems | Software Development Intern | Verona, WI | May 2018 -- Aug 2018 - Developed a surgical planning applet for Epic's **OpTime** operating room management system using C# and WPF, integrating with HL7-compliant patient workflows. - Implemented visual hierarchy logic to highlight critical implants based on surgery location and MRI safety classifications. --- ### Garmin International | Software Engineering Intern | Olathe, KS | May 2017 -- Aug 2017 - Developed a Java-based REST API to synchronize user health data from Garmin wearables post-outages, reducing algorithm complexity from O(n³) to O(n). - Created a sandbox testing environment using Spring Boot to validate 3rd party REST API integrations for the Garmin Health enterprise platform. --- ### NRC Health | Raikes School Senior Design Capstone | Lincoln, NE | Aug 2017 -- May 2018 - Built an interactive geospatial health market analysis web tool (JavaScript, C#, ASP.NET) for NRC Health as a University of Nebraska Raikes School Senior Design capstone engagement. - Applied Agile project management methodologies with Azure DevOps CI/CD throughout the full project lifecycle. --- ### CSG International | Software Development Intern | Omaha, NE | May 2016 -- Dec 2016 - Enhanced an infrastructure event logging and alerting web application using C#, .NET, Elasticsearch, TypeScript, and AngularJS 1.5/1.6. - Developed automated UI and regression tests with C#, Selenium WebDriver, and Gherkin (BDD); integrated into Azure DevOps CI/CD pipelines. --- ## Personal Projects **EbSnap** *(commercial SaaS — ebsnap.com)* | Next.js 16, React 19, Google Gemini (Vertex AI), Prisma, Stripe, eBay Sell API | 2025 -- Present AI-powered eBay listing generator: users snap a product photo and receive a complete, optimized listing — title, item specifics, description, and market-based pricing — in seconds, with one-click publishing to eBay. Features Gemini vision-based item identification, multi-account eBay OAuth, Stripe subscription tiers, and client-side image optimization. Deployed live in production at ebsnap.com. **AI Phone Agent** | Twilio Media Streams, AWS Bedrock Nova Sonic, OpenAI Realtime API, Pipecat/FastAPI, AWS ECS Fargate | 2025 -- Present Real-time voice agent platform for automated inbound/outbound phone handling. Streams telephony audio into a low-latency speech-to-speech LLM pipeline with tool use — lead qualification, SMS booking links, and CRM/email handoff. Containerized for AWS ECS Fargate with Twilio signature validation and rate limiting. **MCP Server Suite** | Model Context Protocol, TypeScript, Python, REST integration | 2024 -- Present Suite of 30+ Model Context Protocol servers that expose external APIs and services (media management, automation platforms, n8n) as typed tools for LLM agents, enabling tool-augmented AI workflows across heterogeneous systems. **AI Document Summarizer** *(cross-platform mobile app)* | .NET MAUI, C#, MVVM, Azure Cosmos DB, Azure Functions, Blob Storage, OpenAI API, Python | 2024 Native cross-platform mobile app (Android, iOS, Windows, macOS) that ingests large public open-data document sets and delivers searchable, AI-generated plain-language summaries and key-change highlights. Python pipeline enriches and stores documents in Cosmos DB; Azure Functions orchestrate automated collection; secrets secured via Azure Key Vault with HTTPS and role-based access. Async operations, lazy loading, and local caching for a responsive UI.