Senior .NET Application Developer (ArcGIS/ESRI), Rate $70/hr on C2C, LA City Hybrid Role.

Key Responsibilities

• Design and develop scalable enterprise web applications using .NET Core, C#, and modern JavaScript frameworks
• Build and integrate applications with ArcGIS / ESRI GIS technologies, including ArcGIS Enterprise, ArcGIS Online, and ArcGIS Maps SDK for JavaScript
• Publish, configure, and maintain ArcGIS Server services (Map Services, Feature Services, Geoprocessing Services)
• Integrate ArcGIS REST APIs and GIS layers with City and third-party enterprise data systems
• Lead system architecture decisions and contribute to Azure-based cloud application modernization
• Develop and consume RESTful APIs (JSON/XML) for data integration across distributed systems
• Convert legacy applications into modern, secure .NET Core microservices-based architectures
• Implement authentication and authorization using OAuth2, JWT, and Active Directory / SSO integration
• Manage Web Adaptor (IIS) configuration for ArcGIS Server to support secure external access
• Write unit tests, conduct system testing, and support user acceptance testing (UAT)
• Implement logging, monitoring, and debugging solutions for high-volume production systems
• Participate in Agile/Scrum processes including sprint planning, backlog grooming, and code reviews
• Create technical documentation, system specifications, and user guides
• Ensure compliance with Los Angeles ITA web standards and security policies

Required Qualifications

• Bachelor's degree in Computer Science, Engineering, or equivalent professional experience
• 7+ years of full-stack web application development experience
• Strong, current proficiency in .NET Core / C# and SQL Server (schema design, stored procedures, performance tuning)
• Hands-on, substantive experience with ArcGIS Enterprise (ArcGIS Server, Portal for ArcGIS, Web Adaptor), ArcGIS Online, and ArcGIS REST APIs
• Experience deploying and managing ArcGIS Server services (Map Services, Feature Services, Geoprocessing Services) in enterprise environments
• Proficiency in HTML5, CSS3, and JavaScript; front-end framework experience (Angular, React, or equivalent)
• Experience with Azure cloud services including App Services, Azure SQL, and Azure DevOps CI/CD pipelines
• Demonstrated experience with legacy application modernization (.NET Framework .NET Core or equivalent)
• Experience implementing OAuth2, JWT, and AD/SSO authentication in enterprise applications
• Proficiency with Git version control and Agile methodologies

Preferred Qualifications

• Experience with ArcGIS Maps SDK for JavaScript for building interactive, location-aware web applications
• Familiarity with Web Adaptor (IIS) configuration and ArcGIS Enterprise security integration (SSO/Active Directory)
• Experience with React, Node.js, TypeScript, Bootstrap, and/or Redux
• Background in large-scale system integration projects in government, utilities, or regulated enterprise environments
• Prior experience with City of Los Angeles or California public agency engagements
• Experience with Docker, Kubernetes, and containerized microservices architectures
• ESRI/ArcGIS certification(s) a plus

Core Technology Stack

• .NET Core / C# / backend services and RESTful APIs
• ArcGIS Enterprise / ArcGIS Online / ArcGIS Maps SDK for JavaScript GIS integration
• Angular / React / TypeScript front-end development
• SQL Server database design and optimization
• Azure App Services, Azure SQL, Azure DevOps, Service Bus
• OAuth2 / JWT / Active Directory authentication and security
• Docker / Kubernetes / CI/CD modern deployment practices