DECAL Senior Full-Stack .NET Modernization Developer

Location: Atlanta, GA (Hybrid)Local candidate only. What This Role Actually IsWe are in the middle of a major modernization effort, moving from a legacy ASP.NET architecture to .NET 8+, modern APIs, Azure cloud services, and a React-based user experience. This is not a maintenance or production support role.This position is for a senior engineer who wants to lead modernization efforts, solve complex technical problems, and help shape the future architecture of a Client platform. You will play a key role in technical design decisions, application architecture, cloud integration, and delivery.Our team is intentionally lean. That means ownership matters. You will be expected to take a solution from concept to production, including design, development, testing, deployment, documentation, and operational support. Success in this role requires initiative, accountability, and the ability to work independently.If you're looking for a highly structured environment where work is narrowly defined and tasks are handed to you step-by-step, this is probably not the right fit. If you enjoy building, leading, and owning outcomes, you'll thrive here.What You Will DoApplication Modernization (Core of this Role)Champion the modernization of Client's mission-critical licensing and eligibility applications, transitioning legacy solutions to modern .NET and Azure-based architectures. Design and implement scalable, secure, and maintainable application solutions that reduce technical debt and improve long-term supportability. Build and evolve API-first integrations and services that enable future platform capabilities. Develop cloud-native solutions using Azure App Services, Azure Functions, and related Azure technologies. Own the SQL Server platform, including data architecture, performance tuning, data migration, and platform modernization. Implement and maintain CI/CD pipelines using Azure DevOps to automate testing, deployment, and release management. Drive engineering excellence through code reviews, automation, documentation, and adherence to modern development practices. Frontend & IntegrationBuild and maintain React-based UI components as part of the modernization roadmapDemonstrate a strong understanding of web application rendering patterns, including client-side rendering (CSR), server-side rendering (SSR), component-based architectures, and modern frontend frameworks. Integrate third-party services and internal APIs; document every integration cleanlyImplement and maintain reporting using SSRS and Power BIParticipate in AI integration initiatives — Azure Agentic AI services, Copilot tooling, and chatbot integrations where applicableQuality, Documentation & SupportWrite code that your teammates can read and maintain six months from nowProvide production support and own root-cause analysis when things breakMaintain application documentation, deployment runbooks, and user-facing guidesParticipate in architecture reviews, code reviews, and sprint ceremoniesRequired QualificationsEXPERIENCE8+ years of professional .NET development experience — C#, ASP.NET MVC, Web APIDemonstrated, hands-on experience migrating legacy ASP.NET applications to modern .NET (6, 7, 8 or 10) — not just exposureProduction SQL Server experience: stored procedures, T-SQL tuning, schema migrations, data cleanupAzure hands-on: App Services, Function Apps, deployment pipelines, configuration management5+ years delivering software in Agile (Scrum or Kanban) environments using ADO or GitHubWHAT HANDS-ON MEANS HEREYou have modernized a real application — not a proof of concept — from legacy ASP.NET to .NET 6/7/8/10You have designed and maintained RESTful APIs that external systems depend onYou have debugged production issues independently, without a team lead walking you through itPreferred QualificationsThese will make you effective faster. They are not dealbreakers, but they distinguish competitive candidates.React experience — specifically building components within an existing application, not greenfieldExposure to .NET 10Power BI or SSRS reporting developmentExperience with government, healthcare, or public-sector systems — you understand compliance, auditability, and data sensitivityFamiliarity with ADA/WCAG 2.1 AA accessibility standardsExposure to Azure Agentic AI services or integration of AI-driven features in production applicationsExperience with middleware platforms such as Boomi or MuleSoftBackground working with PII data and the security protocols that protect itEducationBachelor's degree in Computer Science, Information Technology, or a related field — or equivalent work experience that demonstrates the same depth