Senior Full-Stack .NET Developer

Resolution Technologies is modernizing a mission-critical, online self-service portal and is building scalable platforms for licensing and eligibility workflows. This Senior Full-Stack .NET Developer role (hybrid in Atlanta, GA) takes ownership of design and delivery as a legacy ASP.NET application moves to .NET 8+, modern API-first services, Azure cloud capabilities, and a React-based UI.

What you’ll work on

You’ll champion the modernization of licensing and eligibility applications, transitioning legacy solutions to .NET and Azure-based architectures. The focus is on reducing technical debt while improving long-term supportability through secure, maintainable implementations.

• Design and implement scalable, secure, and maintainable solutions for mission-critical applications.
• Build and evolve API-first integrations and services to support future platform capabilities.
• Develop cloud-native functionality 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 modern development practices.
• Build and maintain React-based UI components as part of the modernization roadmap.
• Apply web application rendering knowledge, including CSR, SSR, component-based architectures, and modern frontend frameworks.
• Integrate third-party services and internal APIs, keeping integration documentation clean and complete.
• Implement and maintain reporting with SSRS and Power BI.
• Participate in AI integration initiatives, including Azure Agentic AI services, Copilot tooling, and chatbot integrations where applicable.
• Provide production support, including independent root-cause analysis when issues occur.
• Maintain application documentation, deployment runbooks, and user-facing guides.
• Join architecture reviews, code reviews, and sprint ceremonies.

What you bring

• 8+ years of professional .NET development experience with C#, ASP.NET MVC, and Web API.
• Hands-on experience migrating legacy ASP.NET applications to modern .NET (6, 7, 8, or 10).
• Production SQL Server experience, including stored procedures, T-SQL tuning, schema migrations, and data clean-up.
• Hands-on Azure experience including App Services, Function Apps, deployment pipelines, and configuration management.
• 5+ years delivering software in Agile (Scrum or Kanban) environments using ADO or GitHub.
• Evidence of modernizing a real application (not a proof of concept) from legacy ASP.NET to .NET 6/7/8/10.
• Designed and maintained RESTful APIs that external systems rely on.
• Ability to debug production issues independently, without needing a team lead to walk through it.
• Education: Bachelor’s degree in Computer Science, Information Technology, or a related field.

Technologies you’ll use

• .NET 8+ (including .NET 6, 7, 8, and 10), ASP.NET, C#, ASP.NET MVC, Web API
• Azure (Azure App Services, Azure Functions, Azure DevOps)
• SQL Server, T-SQL
• React, SSR, CSR
• SSRS, Power BI
• Azure Agentic AI services, Copilot tooling, chatbot integrations
• Agile (Scrum, Kanban), ADO, GitHub, RESTful APIs

Preferred strengths

• React experience building components inside an existing application (not greenfield).
• Exposure to .NET 10.
• Power BI or SSRS reporting development.
• Experience in government, healthcare, or public-sector systems with strong understanding of compliance, auditability, and data sensitivity.
• Familiarity with ADA/WCAG 2.1 AA accessibility standards.
• Exposure to Azure Agentic AI services or production integration of AI-driven features.
• Experience with middleware platforms such as Boombei or MuleSoft.
• Background working with PII data and security protocols that protect it.