Application Architect

Application Architect
Onsite

Description:
Diversified Systems is searching for an Application Architect with deep .NET and SQL Server expertise to design and modernize applications and provide enterprise solution architecture across Microsoft and Java-based platforms, ensuring secure, scalable, maintainable and reusable application solutions. This role leads the adoption of AI-augmented development, advanced GitHub Copilot usage across teams while accelerating delivery and upholding security, WCAG accessibility, and regulatory compliance.

Responsibilities:

• Architect secure, scalable .NET (C#/ASP.NET Core) applications and SQL Server solutions using clean architecture, DDD, and performance optimization patterns.
• Develop enterprise solution architectures that span multiple applications, services, APIs, databases and integration platforms while ensuring long-term maintainability and scalability.
• Design data models, advanced T-SQL (stored procedures, indexing, partitioning, Query Store tuning), and HA/DR strategies for high-volume transactional systems.
• Define integration strategies for enterprise systems including REST APIs, messaging authentication, and data exchange between Microsoft, IBM and third-party platforms.
• Drive adoption of GitHub Copilot for .NET development, including custom instructions, prompt engineering, and AI-assisted refactoring and automated code reviews, documentation and testing.
• Produce architecture diagrams and technical specifications; lead design reviews; mentor teams on .NET patterns and Copilot best practices.
• Establish architecture standards, coding standards, reusable design patterns, and technical best practices across development teams.
• Ensure solutions meet Commonwealth IT security policies, WCAG 2.2 accessibility, PII protection, and zero-trust principles in a regulated utility environment.
• Lead the application modernization technical design efforts to migrate legacy applications into cloud native applications.
• Develop modernization roadmaps, evaluate technical debt and recommend phased migration strategies.
• Design and implement modern software delivery practices including source control strategies, branching models, CI/CD pipelines, automated deployments, environment management and DevSecOps practices.
• Evaluate emerging technologies, frameworks and commercial software products to provide recommendations aligned with the long-term technology strategy.
• Provide technical leadership during project planning, estimation, POC's and architecture review sessions.

Requirements:

• 8 years of software engineering experience required.
• 4 years of Application/Solution Architect experience on enterprise .NET and SQL Server projects in complex environments required.
• Expert-level C#, ASP.NET Core, Entity Framework Core, Web API, and modern .NET practices (clean architecture, minimal APIs, DI, async/await patterns) required.
• Advanced SQL Server experience including complex T-SQL optimization, execution plans, indexing strategies, security (RLS, DDM), and Always On availability groups required.
• Daily professional experience with GitHub Copilot for .NET/C# development, including advanced configuration and team enablement required.
• Proven hands-on experience converting data from legacy systems to modernization application data models required.
• Strong secure SDLC, Entra ID/managed identities, API security, and enterprise governance experience; excellent communication and stakeholder skills required.
• Public sector, utilities, or regulated industry experience with strict compliance and accessibility mandates required.
• Familiarity with legacy modernization, IBM FileNet/BAW; Microsoft Azure Solutions Architect Expert or equivalent certifications required.
• Bachelor's degree in Computer Science, Information Systems, or equivalent required.

About Diversified Systems
Founded in 1990, Diversified Systems is an award-winning Technology Services corporation providing all levels of IT project consulting services nationwide. DSI is headquartered in Columbus, Ohio with regional offices in the American Midwest and East Coast. We offer our consultants a number of flexible and competitive compensation benefit packages.

Diversified Systems is committed to the principles of equal employment. We are committed to complying with all federal, state, and local laws providing equal employment opportunities, and all other employment laws and regulations.

Diversity, Equity and Inclusion
DSI values authenticity and is committed to making sure our employees and partners are valued and respected. At DSI, we believe building a diverse culture is important because we know when people work together, we can achieve better results as a team. DSI realizes that everyone comes from various backgrounds. We celebrate these differences because our employees are our greatest asset as we strive to best meet the needs of those we serve. As part of our ongoing efforts, DSI is focused on advancing equality, diversity, and inclusion by setting high standards to continually evolve our culture. This includes but is not limited to recruiting, community involvement, client delivery, and career development.