I am a results-driven Senior .NET Engineer with over 15 years of experience designing and developing high-performance, cloud-based, microservices-driven applications. My expertise spans .NET Core, React, Angular, Azure, AWS, SQL Server, and PostgreSQL. I have a proven track record of modernizing legacy systems, optimizing database performance, and implementing scalable enterprise solutions. Passionate about Agile development, test-driven development (TDD), and DevOps automation, I strive to drive engineering excellence. Throughout my career, I've led significant modernization projects, integrated complex systems such as Microsoft Dynamics 365 and Salesforce, and developed efficient cloud-native microservices architectures. I enjoy mentoring junior engineers and collaborating with cross-functional teams to build innovative, secure, and high-quality software solutions that drive business success.

Zachary Chase Marsden

I am a results-driven Senior .NET Engineer with over 15 years of experience designing and developing high-performance, cloud-based, microservices-driven applications. My expertise spans .NET Core, React, Angular, Azure, AWS, SQL Server, and PostgreSQL. I have a proven track record of modernizing legacy systems, optimizing database performance, and implementing scalable enterprise solutions. Passionate about Agile development, test-driven development (TDD), and DevOps automation, I strive to drive engineering excellence. Throughout my career, I've led significant modernization projects, integrated complex systems such as Microsoft Dynamics 365 and Salesforce, and developed efficient cloud-native microservices architectures. I enjoy mentoring junior engineers and collaborating with cross-functional teams to build innovative, secure, and high-quality software solutions that drive business success.

Available to hire

I am a results-driven Senior .NET Engineer with over 15 years of experience designing and developing high-performance, cloud-based, microservices-driven applications. My expertise spans .NET Core, React, Angular, Azure, AWS, SQL Server, and PostgreSQL. I have a proven track record of modernizing legacy systems, optimizing database performance, and implementing scalable enterprise solutions. Passionate about Agile development, test-driven development (TDD), and DevOps automation, I strive to drive engineering excellence.

Throughout my career, I’ve led significant modernization projects, integrated complex systems such as Microsoft Dynamics 365 and Salesforce, and developed efficient cloud-native microservices architectures. I enjoy mentoring junior engineers and collaborating with cross-functional teams to build innovative, secure, and high-quality software solutions that drive business success.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
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Language

English
Fluent

Work Experience

Senior .NET Enterprise Developer at PCMS
May 1, 2025 - September 2, 2025
Led the modernization of legacy software transforming monolithic applications into scalable, microservices-based solutions on Azure Cloud. Designed and integrated custom CRM solutions using Microsoft Dynamics 365, Salesforce, and SAP, improving business decision-making by 23%. Developed and optimized microservices architecture with .NET 8, Azure Functions, and Kubernetes. Refactored legacy .NET Framework applications into .NET Core, improving performance by 31%. Migrated applications to Azure and AWS, reducing costs and enhancing availability. Implemented serverless computing, message brokering with Azure Service Bus, and optimized database and API integrations across various platforms. Established CI/CD pipelines and Infrastructure-as-Code automation. Mentored junior engineers and collaborated across Agile teams to deliver high-impact solutions.
.NET Developer at Willis Towers Watson
October 1, 2019 - September 2, 2025
Designed and implemented a cloud-based video platform enabling video-on-demand and live streaming across 700+ locations. Developed microservices using .NET Core, Docker, and Kubernetes ensuring scalability. Integrated Siemens Opcenter MES with ERP systems to automate workflows. Created RESTful APIs and WCF services improving interoperability with healthcare systems. Improved security via JWT and OAuth 2.0. Enhanced SQL Server performance by 20% through query optimization. Built CI/CD pipelines and UI components in React and Blazor. Ensured compliance with healthcare regulations and implemented real-time analytics dashboards.
Production Support Analyst/Junior Support Engineer at UST Global
October 1, 2015 - September 2, 2025
Troubleshot UI issues using AngularJS and rewrote legacy jQuery and CoffeeScript code to improve performance. Optimized data access layers resulting in a 13% performance gain. Built real-time APIs for inventory and warehouse synchronization, reducing stock errors. Consolidated business logic libraries improving code reuse. Developed SQL and ASP.NET messaging services for live user communication. Supported EDI mapping and trading partner onboarding. Participated in ERP integrations and automation. Developed serverless solutions using AWS Lambda and containerized applications with Docker. Applied cloud security best practices and maintained high-traffic e-commerce platform features.
Internet/CATI Programmer at DSS Research
October 1, 2013 - September 2, 2025
IT Field Services Technician at Angelo State University
May 1, 2012 - September 2, 2025
Senior .NET Enterprise Developer at PCMS
May 1, 2025 - September 2, 2025
Led modernization of legacy software transforming monolithic applications into scalable microservices on Azure Cloud. Delivered custom CRM solutions integrating Microsoft Dynamics 365, Salesforce, and SAP for various industries, improving business process efficiency. Built microservices architecture using .NET 8, Azure Functions, and Kubernetes, reducing technical debt and improving system resilience. Migrated applications to Azure and AWS cloud platforms, optimized database schemas, and implemented secure API layers with OAuth 2.0 and JWT. Developed integrations with healthcare systems, payment gateways, and enterprise ERPs ensuring compliance and real-time synchronization. Automated deployments with CI/CD and Infrastructure as Code using Terraform and Helm. Mentored teams and collaborated on AI-driven analytics features.
.NET Developer at Willis Towers Watson
October 1, 2019 - September 2, 2025
Designed and implemented a cloud-based video platform with video-on-demand and live streaming features across 700+ locations. Developed microservices architecture with .NET Core, Docker, and Kubernetes improving scalability. Integrated Siemens Opcenter MES with ERP systems automating production tracking. Created RESTful APIs and WCF services enhancing interoperability with healthcare systems. Managed AWS S3 and CloudFront for secure, low-latency content delivery. Implemented secure authentication mechanisms using JWT and OAuth 2.0. Improved SQL Server performance via query optimization, built dashboards with Azure Synapse, React, and Blazor. Led CI/CD pipelines and maintained compliance with healthcare regulations.
Production Support Analyst/Junior Support Engineer at UST Global
October 1, 2015 - September 2, 2025
Troubleshot and improved UI/UX using AngularJS and JavaScript, replacing legacy CoffeeScript and jQuery. Optimized data access layers increasing performance by 13%. Developed APIs for real-time synchronization between inventory and warehouse systems reducing stock errors. Consolidated business logic libraries improving maintainability. Enhanced user engagement by 22% through front-end improvements. Analyzed and supported EDI transactions and onboarding of new trading partners. Implemented serverless solutions with AWS Lambda and developed containerized applications with Docker and ECS. Applied cloud security best practices and contributed to high-traffic e-commerce features using .NET Core and SQL Server.
Internet/CATI Programmer at DSS Research
October 1, 2013 - September 2, 2025
IT Field Services Technician at Angelo State University
May 1, 2012 - September 2, 2025
Senior .NET Enterprise Developer at PCMS
May 1, 2025 - September 2, 2025
Led the modernization of legacy software by transforming monolithic applications into scalable, microservices-based systems deployed on Azure Cloud. Designed and integrated custom CRM solutions using Microsoft Dynamics 365, Salesforce, and SAP, streamlining business processes across multiple industries. Developed and optimized microservices architecture with .NET 8, Azure Functions, and Kubernetes, reducing technical debt and improving system resilience. Built high-performance REST APIs and GraphQL services improving response times by 23%. Implemented secure API gateways, authentication with OAuth 2.0 and JWT, and PCI-compliant payment microservices using Stripe and PayPal. Enhanced cloud resource allocation with Kubernetes, serverless computing solutions, and implemented comprehensive monitoring and security including HIPAA and SOC 2 compliance. Mentored junior engineers and led Agile teams while collaborating with product management and Data Science teams to integrate AI-driven analy
.NET Developer at Willis Towers Watson
October 1, 2019 - September 2, 2025
Designed and implemented a cloud-based video platform using microservices architecture with .NET Core, Docker, and Kubernetes. Integrated Siemens Opcenter MES with ERP systems via .NET APIs to automate production and improve efficiency. Developed RESTful APIs and WCF services to enhance interoperability with third-party healthcare systems. Integrated AWS services such as S3 and CloudFront for secure file storage and content delivery. Implemented JWT and OAuth 2.0 authentication to enhance security. Optimized SQL Server performance and built an interactive reporting dashboard providing real-time analytics using Azure Synapse. Fostered compliance with healthcare regulations including HIPAA and PCI-DSS. Led CI/CD pipeline development and mentored junior engineers in .NET, cloud, and DevOps practices.
Production Support Analyst/Junior Support Engineer at UST Global
October 1, 2015 - September 2, 2025
Troubleshot UI issues and developed new forms using AngularJS and JavaScript, improving user engagement by 22%. Optimized data access layer, improving data retrieval performance by 13%. Built APIs for real-time synchronization of inventory and warehouse systems to reduce stock errors and improve fulfillment. Consolidated business logic libraries to improve code reuse and maintenance. Analyzed and resolved issues related to EDI mapping and collaborated to onboard new EDI trading partners. Developed serverless solutions on AWS Lambda and containerized applications with Docker for resource optimization. Ensured cloud infrastructure security best practices, and developed business components using C#, WCF, BizTalk, and Entity Framework.
Internet/CATI Programmer at DSS Research
October 1, 2013 - September 2, 2025
IT Field Services Technician at Angelo State University
May 1, 2012 - September 2, 2025
Senior .NET Enterprise Developer at PCMS
May 1, 2025 - September 2, 2025
Led the modernization of a 15-year-old legacy software system by transforming monolithic applications into scalable, microservices-based solutions deployed on Azure Cloud. Designed and integrated custom CRM solutions using Microsoft Dynamics 365 and Salesforce, improving business processes across retail and finance sectors. Developed and optimized microservices architecture using .NET 8, Azure Functions, and Kubernetes, reducing technical debt and enhancing system resilience. Engineered REST APIs and GraphQL services for learning management systems, integrated multiple enterprise platforms ensuring real-time synchronization, and implemented secure, PCI-compliant payment microservices. Championed cloud migration to Azure and AWS, created CI/CD pipelines, automated infrastructure provisioning, and established monitoring using Azure Monitor and AWS CloudWatch. Mentored junior engineers and led Agile teams for efficient software delivery.
.NET Developer at Willis Towers Watson
October 1, 2019 - September 2, 2025
Designed and implemented a cloud-based video platform supporting video-on-demand, live streaming, and secure document sharing to increase user engagement at over 700 locations. Developed microservices architecture using .NET Core, Docker, and Kubernetes to ensure scalability. Integrated Siemens Opcenter MES with ERP systems, implemented secure JWT and OAuth 2.0 authentication, optimized SQL Server performance, and built interactive reports with Power BI and Azure Synapse. Maintained CI/CD pipelines and ensured compliance with healthcare regulations including HIPAA. Collaborated with business teams to deliver customer-focused solutions and mentored junior engineers on best practices.
Production Support Analyst/Junior Support Engineer at UST Global
October 1, 2015 - September 2, 2025
Troubleshot and improved UI issues using AngularJS and vanilla JavaScript, optimizing data access for a 13% data retrieval improvement. Developed APIs for real-time synchronization across inventory and warehouse systems, consolidated business logic libraries to improve code reuse, and enhanced user experience with AngularJS and HTML5 to increase engagement and retention. Managed EDI mapping and transaction set processes, onboarded new EDI trading partners, and implemented serverless solutions with AWS Lambda and DynamoDB. Developed business components using C#, WCF, BizTalk, and Entity Framework in a high-traffic e-commerce environment.
Internet/CATI Programmer at DSS Research
October 1, 2013 - September 2, 2025
IT Field Services Technician at Angelo State University
May 1, 2012 - September 2, 2025

Education

Bachelor of Science at Angelo State University
January 1, 2008 - January 1, 2012
Bachelor of Science at Angelo State University
January 1, 2008 - January 1, 2012
Bachelor of Science at Angelo State University
January 1, 2008 - January 1, 2012
Bachelor of Science at Angelo State University
January 1, 2008 - January 1, 2012

Qualifications

DEV204x: Programming with C#
January 11, 2030 - September 2, 2025
DEV204x : Programming with C#
January 11, 2030 - September 2, 2025
DEV204x : Programming with C#
January 11, 2030 - September 2, 2025
DEV204x: Programming with C#
January 11, 2030 - September 2, 2025

Industry Experience

Financial Services, Healthcare, Retail, Software & Internet, Manufacturing, Professional Services