Dotnet Developer

SunPlus Data Group, Inc. is seeking experienced technology professionals to support a federal application modernization, enhancement, testing, deployment, and operations program. The work supports a Microsoft Azure-based ecosystem that includes a custom web application, iOS and Android mobile applications, APIs and microservices, Azure SQL, and integrations with external data sources. The delivery model uses Agile development, DevOps, quarterly releases, testing, documentation, training, security support, and ongoing operations and maintenance. SunPlus is seeking a Senior .NET Developer to provide hands-on architecture, development, integration, testing, deployment, and production support for the OARS platform.

• Design, develop, enhance, test, and support .NET-based web applications, APIs, and service-layer components.
• Develop and maintain microservices and integrations with existing applications, third-party services, and external data sources.
• Support Microsoft Azure-hosted environments, including Azure-based application services, Azure SQL, and AKS-related application components.
• Translate functional and non-functional requirements into secure, scalable application designs and technical implementation plans.
• Maintain and update system architecture, design documentation, interface documentation, and related technical artifacts throughout sprint cycles.
• Participate in Agile sprint planning, backlog refinement, estimation, code reviews, demonstrations, retrospectives, and quarterly release planning.
• Support CI/CD, DevOps, deployment configuration, release management, and promotion across development, test, pre-production, and production environments.
• Create and maintain unit, integration, regression, automated functional, load, performance, and smoke tests as required for releases.
• Support production operations and Tier 3 troubleshooting, including application issues, platform configurations, deployments, patching, monitoring, redundancy, and failover.
• Support security documentation, vulnerability remediation, FedRAMP Moderate control requirements, and Section 508 accessibility implementation and testing.
• Contribute to user guides, training materials, release packages, status reporting, and knowledge transfer.

• Senior-level experience developing and supporting enterprise applications using C# and the Microsoft .NET ecosystem.
• Hands-on experience with ASP.NET / ASP.NET Core, REST APIs, service integration, and microservice-based application architecture.
• Demonstrated experience supporting applications in Microsoft Azure environments.
• Experience with containerized or Kubernetes-based application environments; AKS experience is strongly aligned to this role.
• Experience with relational databases and data-driven applications, preferably Microsoft SQL Server or Azure SQL.
• Experience with Agile software delivery, sprint-based development, source control, DevOps, CI/CD, and release management.
• Experience creating or supporting unit, integration, regression, performance, and production-validation testing.
• Strong troubleshooting, documentation, communication, and cross-functional collaboration skills.

• Federal, state, or other public-sector application development experience.
• Experience with Section 508 accessibility, secure software development, ATO/security documentation, vulnerability testing, or FedRAMP-aligned environments.
• Experience supporting high-volume applications, API gateways, data integrations, and production systems with defined availability and response targets.
• Experience mentoring developers or providing technical leadership across Agile delivery teams.