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I'm a Senior .NET Engineer with over a decade of experience designing and scaling mission-critical healthcare and fintech platforms. I specialize in distributed systems, high-performance APIs, and cloud-native architectures on Azure and AWS, with a track record of modernizing legacy systems, reducing costs, and delivering resilient software. Throughout my career, I've led cross-functional teams, collaborated with clinical and compliance stakeholders to meet HIPAA and PCI requirements, and mentored engineers to deliver high-quality releases. I enjoy turning complex problems into clean, maintainable solutions and helping organizations move faster with reliable systems.…I'm a Senior .NET Engineer with over a decade of experience designing and scaling mission-critical healthcare and fintech platforms. I specialize in distributed systems, high-performance APIs, and cloud-native architectures on Azure and AWS, with a track record of modernizing legacy systems, reducing costs, and delivering resilient software. Throughout my career, I've led cross-functional teams, collaborated with clinical and compliance stakeholders to meet HIPAA and PCI requirements, and mentored engineers to deliver high-quality releases. I enjoy turning complex problems into clean, maintainable solutions and helping organizations move faster with reliable systems.

Aaron Zimmerman

Full Stack Developer, Back-End Developer, Web Developer, +3

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I'm a Senior .NET Engineer with over a decade of experience designing and scaling mission-critical healthcare and fintech platforms. I specialize in distributed systems, high-performance APIs, and cloud-native architectures on Azure and AWS, with a track record of modernizing legacy systems, reducing costs, and delivering resilient software. Throughout my career, I've led cross-functional teams, collaborated with clinical and compliance stakeholders to meet HIPAA and PCI requirements, and mentored engineers to deliver high-quality releases. I enjoy turning complex problems into clean, maintainable solutions and helping organizations move faster with reliable systems.…I'm a Senior .NET Engineer with over a decade of experience designing and scaling mission-critical healthcare and fintech platforms. I specialize in distributed systems, high-performance APIs, and cloud-native architectures on Azure and AWS, with a track record of modernizing legacy systems, reducing costs, and delivering resilient software. Throughout my career, I've led cross-functional teams, collaborated with clinical and compliance stakeholders to meet HIPAA and PCI requirements, and mentored engineers to deliver high-quality releases. I enjoy turning complex problems into clean, maintainable solutions and helping organizations move faster with reliable systems.

Available to hire

I’m a Senior .NET Engineer with over a decade of experience designing and scaling mission-critical healthcare and fintech platforms. I specialize in distributed systems, high-performance APIs, and cloud-native architectures on Azure and AWS, with a track record of modernizing legacy systems, reducing costs, and delivering resilient software.

Throughout my career, I’ve led cross-functional teams, collaborated with clinical and compliance stakeholders to meet HIPAA and PCI requirements, and mentored engineers to deliver high-quality releases. I enjoy turning complex problems into clean, maintainable solutions and helping organizations move faster with reliable systems.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Senior .Net Engineer at Acadia Healthcare

January 1, 2023 - April 1, 2026

Led design and development of an AI-enabled medical conference management platform using ASP.NET Core (.NET 8) on Azure, applying Domain-Driven Design and Event-Driven Microservices to improve scalability and maintainability. Modernized legacy SOAP services into RESTful APIs, applying SOLID principles and Repository/Factory patterns to reduce latency and improve reliability. Optimized high-throughput REST APIs with async/await, Redis caching, and EF Core query tuning, cutting average response times. Refactored T-SQL queries and indexing to boost data access performance by about 20%. Built a React/TypeScript SPA for healthcare platform, enabling reusable components and faster UI work. Improved observability and fault isolation via structured logging and Azure monitoring; integrated Python-based AI components for data classification. Implemented API security with Azure API Management, OAuth 2.0 and JWT; enforced IP whitelisting. Developed unit/integration tests with NUnit/xUnit and integ

Full Stack .Net Developer at Elevate

August 1, 2019 - January 1, 2023

Migrated a monolithic ASP.NET MVC application to a modular .NET Core and Angular architecture on AWS, achieving a 15% increase in application performance. Integrated third-party payment gateways and internal financial systems using RESTful and SOAP APIs, applying OAuth2 and TLS encryption and structured error handling to support secure and reliable financial transactions. Redesigned legacy pages in collaboration with UI/UX engineers using Figma, HTML, CSS, and Angular, reducing page load time and enhancing user experience. Developed data access layers using Dapper and Entity Framework with SQL Server and Oracle to reduce execution time for heavy workloads and support application monitoring through AWS to improve incident response times. Implemented API versioning, structured error handling, OAuth 2.0 authentication, and rate limiting middleware in ASP.NET Core, while integrating Swagger for API documentation and testing. Deployed and supported .NET services on AWS (EC2, RDS), utilizing

.Net Developer at Hewlett Packard Enterprise

July 1, 2015 - August 1, 2019

Developed and maintained internal desktop tools using C# and WPF, implementing MVVM patterns and data binding to support device configuration and monitoring workflows. Built responsive web applications using HTML, CSS, and JavaScript, increasing user engagement. Improved application performance by 30% through code optimization and refactoring. Debugged over 20,000 lines of C# code, resolving transaction issues affecting 5,700 users and restoring customer trust. Resolved over 100 customer-reported issues, improving user satisfaction ratings by 10%. Refactored application components and optimized SQL queries and indexing strategies to improve overall performance and support scalability.