Senior .NET Architect

Location: Richmond, VA (Hybrid – 2 Days Onsite per Week)

Duration: 12 months contract

Experience: 10+ years in development; 4+ years in modern .NET solution architecture

Key Responsibilities: Translate the DEQAct framework and technical attachments into an application-specific architecture for BMP Warehouse, identifying reusable DEQ patterns and project-specific extensions. Define the SPA/BFF/API separation, service boundaries, request/response patterns, error-handling conventions, validation architecture, background/asynchronous processing, configuration management, and observability approach. Lead technical design for large/chunked uploads, staged review/approval, record editing, transformations, search/reporting, exports, scheduled processes, and role/organization-scoped access. Design authentication/authorization integration with DEQ enterprise identity/Duende IdentityServer and ensure role-based security is consistently enforced across UI, BFF, APIs, and data access. Define secure API patterns for CGP, CEDS/TMDL IP, OLAP, DCR/VACS, local-government access, and future extensibility; coordinate ownership and versioning with DEQ technical teams. Guide Oracle-to-SQL Server modernization decisions jointly with the Data Lead, including transaction boundaries, data-access patterns, migration compatibility, performance, audit logging, and rollback considerations. Define GitLab repository structure, branching/merge strategy, coding standards, review gates, build/release conventions, secrets/configuration handling, and environment promotion with the team. Produce and maintain system design documentation and architecture diagrams; review technical deliverables from developers/data/GIS resources. Perform hands-on coding, spikes/prototypes, code reviews, troubleshooting, and remediation for high-risk or cross-cutting components. Ensure non-functional requirements are engineered in: scalability, file cleanup, audit/ETL logging, security, backup/recovery dependencies, performance, and four-environment deployability. Support technical demonstrations, performance/load tuning, production-readiness reviews, deployment, knowledge transfer, and as-built documentation. Minimum / Required Profile for Sourcing:10+ years of software engineering experience with deep recent experience in ASP.NET Core and modern .NET.Strong experience designing and building REST APIs and BFF/service-layer patterns; hands-on ability to code and review production-quality .NET.Experience with Vue.js or comparable modern TypeScript SPA frameworks; Vue 3 experience strongly preferred. Strong SQL Server design/performance experience and understanding of legacy Oracle modernization/migration concerns. Experience with OAuth2/OpenID Connect, identity providers, RBAC/claims, secure API design, and enterprise authentication integration. Experience designing asynchronous/background processing, file ingestion, high-volume data workflows, audit logging, and resilient integration patterns. Experience with GitLab or comparable enterprise Git/CI/CD tooling and multi-environment release management. Ability to communicate architecture decisions clearly to developers and government technical stakeholders.

Preferred Skills: Direct experience with Vue 3 + TypeScript, .NET 8/9/10 Minimal APIs, ASP.NET Core BFF patterns, Duende IdentityServer, SQL Server 2022, and GitLab CI/CD.Experience modernizing ASP.NET MVC/.NET Framework + Oracle applications. Public-sector application modernization and security/compliance experience. Microsoft/Azure/.NET architecture certifications are helpful but not mandatory.