ArcGIS Pro Add-In Developer — C# / .NET / ArcGIS Pro SDK

We are building a production-grade ArcGIS Pro add-in that integrates a proprietary REST API into the ArcGIS Pro desktop environment. This is a long-term engagement for the right developer. The add-in allows professional GIS users to create, edit, and remove geospatial assets inside ArcGIS Pro while enforcing backend business logic and compliance rules through API-driven workflows. Validated changes sync automatically to an ArcGIS Enterprise schema used across the organization. This is a desktop-first role. Not web GIS. Not ArcMap. ArcGIS Pro SDK on Windows. What You'll Work On: - ArcGIS Pro SDK add-in development (C# / .NET) — ribbon tools, dockable panels, custom map tools - REST API integration — authenticated retrieval, validated write-back, sync patterns - Client-side enforcement of business rules governing asset edits before API submission - Sync of validated changes to ArcGIS Enterprise (Server + Portal) — feature services and enterprise geodatabase - Concurrent editing and change management across multiple GIS users - Performance with large real-world feature datasets Must-Have: - Production ArcGIS Pro SDK experience — you have shipped at least one add-in - Strong C# / .NET (3+ years) - WPF + MVVM - ArcGIS Enterprise architecture — Pro, Server, Portal integration - REST API integration — auth, error handling, sync - Geospatial fundamentals — geometry types, coordinate systems, feature layers, projections Strong Plus: - Enterprise geodatabase versioning and conflict resolution - NetTopologySuite or similar .NET spatial libraries - Performance optimization with large vector datasets - UX experience for technical GIS users