Mid-Level Application Developer - DHS

• Bachelor’s or master’s degree in IT, Computer Science, Geography or a related field.
• 5+ years of professional application-development experience, including at least three years developing or supporting geospatial, mapping, location-intelligence, data-visualization, or situational-awareness solutions.
• Demonstrated experience developing and maintaining applications using C# and the .NET framework.
• Experience using ESRI developer technologies such as ArcGIS Enterprise/Portal, ArcGIS Online, ESRI APIs and SDKs, ArcGIS API for JavaScript, Experience Builder, Dashboards, web maps, hosted layers, or comparable capabilities.
• Proficiency with Python scripting and automation; experience with ArcGIS Notebooks, Jupyter notebooks, or comparable notebook-based workflows.
• Experience developing and consuming REST APIs, integrating enterprise systems and data services, and working with JSON/GeoJSON, relational databases, geodatabases, and common geospatial formats.
• Experience creating automated tests and executing unit, integration, regression, security, and operational test activities within a controlled software-delivery lifecycle.
• Experience with Git-based source control and Agile delivery tools such as GitLab, Jira, and Confluence.
• Strong analytical, troubleshooting, documentation, communication, and cross-functional collaboration skills.
• Ability to satisfy DHS suitability, background-investigation, Entry on Duty, security, and system-access requirements for the assigned position.
• Experience developing applications for DHS, another federal agency, public safety, emergency management, critical infrastructure, intelligence, defense, or homeland-security missions.
• Experience deploying or supporting ESRI and custom web applications in AWS or another enterprise cloud environment.
• Knowledge of ArcGIS Enterprise administration concepts, identity integration, role- and attribute-based access control, geospatial data publishing, and enterprise geodatabase patterns.
• Experience with Section 508/WCAG accessibility, secure coding, DevSecOps pipelines, static or dynamic application-security testing, and vulnerability remediation.
• Working knowledge of IPv6/dual-stack application design, federal cloud and security requirements, DHS SELC artifacts, and formal change-control boards.
• Experience with AI-enabled geospatial workflows, automated data ingestion, real-time dashboards, performance monitoring, or high-availability mission applications.

• Design, develop, enhance, debug, and maintain custom geospatial and situational-awareness applications and tools for the GII, COP, and HIFLD mission environments.
• Develop and maintain application components using the .NET framework, C#, ESRI APIs and SDKs, and other Government-approved technologies in the existing GCIS technical architecture.
• Create custom web applications using ESRI Experience Builder and the ArcGIS API for JavaScript; configure interactive dashboards, web maps, layers, symbology, pop-ups, labeling, and mission-focused visualization experiences.
• Participate in application and data architecture decisions involving client/server processing, relational and geospatial databases, data storage and access, interfaces, interoperability, and enterprise integration.
• Build maintainable, reusable, and well-documented code that supports evolving operational requirements, system scalability, reliability, security, and efficient lifecycle maintenance.
• Maintain compatibility with current ESRI software releases and implement approved features, fixes, and enhancements without unnecessary disruption to ongoing operations.
• Develop Python and ArcGIS Notebook scripts that automate geospatial data processing, analysis, ingestion, publishing, monitoring, and reporting tasks.
• Implement automated workflows that reduce manual intervention and reliably process structured and unstructured geospatial information in supported formats.
• Support integrations and ingestion involving CSV, TXT, GPX, JSON, GeoJSON, geodatabases, shapefiles, KML, BIM, LAS, APIs, and REST services.
• Implement geocoding and locational metadata capabilities using addresses, latitude/longitude, Military Grid Reference System (MGRS), and United States National Grid (USNG) coordinates as required.
• Evaluate and implement approved AI-assisted or AI-driven workflow enhancements that improve efficiency, adapt to real-time data, and optimize geospatial handling while complying with DHS policy and governance
• Integrate geospatial applications, web services, data feeds, identity services, databases, and other enterprise systems to improve mission functionality and secure information sharing.
• Develop testing criteria from operational requirements and key performance parameters; create comprehensive test plans, test scripts, test cases, and traceable expected results.
• Develop and maintain manual and automated tests; conduct developmental, integration, regression, security, accessibility, and operational testing and capture evidence and results.
• Analyze test outcomes, document defects, troubleshoot root causes, implement corrective actions, and report conclusions and recommendations.
• Participate in code reviews, configuration management, change-impact analysis, release readiness reviews, and validation that only approved and tested changes are incorporated.
• Produce per-release custom application code, test artifacts, integration documentation, technical specifications, data-flow diagrams, and integration-test results.
• Support deployments, upgrades, releases, emergency fixes, and application enhancements across development, staging, preproduction, and production environments.
• Prepare deployment documentation and obtain required approvals before releases: SDD Change Control Board approval for preproduction and both SDD CCB and Infrastructure Change Control Board approval for production.
• Coordinate application activities with the DHS Enterprise Cloud Team, OneNet, DHS data centers, AWS providers, system administrators, security teams, and other technical stakeholders.
• Diagnose and resolve application defects, integration issues, performance problems, and user-reported incidents; document solutions and escalate complex infrastructure or specialized issues appropriately.
• Monitor application health, utilization, reliability, availability, maintainability, performance, and user feedback; recommend and implement approved improvements.
• Create and update technical documentation, installation and deployment instructions, user guides, FAQs, troubleshooting materials, SOPs, and knowledge-base content

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