Leading U.S. Energy Utility Modernizes Legacy Application with Concierto Modernize: Cloud-Native Transformation on AWS
Executive Summary
A leading U.S. energy utility engaged Concierto to modernize a mission-critical legacy application built on .NET Framework 4.8 with ASP.NET Web Forms and Microsoft SQL Server. The engagement encompassed framework migration to .NET 8, database re-platforming to Amazon Aurora PostgreSQL, containerization on AWS Fargate, and full CI/CD automation.
Concierto's Modernize platform delivered intelligent assessment through Compass and executed the transformation through Studio, achieving complete cloud-native modernization within an accelerated timeline and establishing a repeatable pathway for the organization's broader application portfolio.
Key Achievements:
- Cloud-Native Application Delivery: Legacy .NET Framework application fully transformed to .NET 8 running on AWS Fargate containers with cloud-native operational patterns
- Database Modernization: Complete migration from SQL Server 2008 to Aurora PostgreSQL with all stored procedures converted and validated, preserving full historical data integrity
- Infrastructure Automation: All AWS infrastructure provisioned through Terraform, enabling repeatable deployments with zero manual steps
- DevOps Maturity: End-to-end CI/CD pipelines automated the entire build, test, and deployment lifecycle via GitHub-integrated delivery
- Security and Compliance: Containerized environment secured with least-privilege IAM roles, secrets management, and hardening aligned to organizational and AWS Well-Architected best practices
Business Challenge
The utility's legacy application posed significant modernization challenges. Built on .NET Framework 4.8 with ASP.NET Web Forms and a Microsoft SQL Server 2008 backend, the application comprised a multi-layered codebase spanning business logic, presentation layers, client-side scripting, and configuration components, supported by an extensive library of stored procedures handling critical business operations across data management, reporting, and system utilities.
Key Challenges:
- Aging technology stack approaching end-of-life
- Monolithic Web Forms architecture constraining developer productivity
- Legacy database infrastructure limiting scalability and cloud readiness
- Absence of automated deployment pipelines
- Legacy source control in TFS restricting modern development workflows
Critical Requirement: The organization needed to transform to a cloud-native architecture while preserving all business logic and historical data dating back nearly two decades.
The Concierto Solution
Concierto Modernize delivered comprehensive modernization through its integrated assessment-to-transformation approach, with Compass providing intelligent discovery and Studio executing the transformation via framework upgrade and containerization pathways.
Intelligent Discovery and Assessment through Concierto Compass
Analyzed the application ecosystem using its dual-engine architecture — combining 5,000+ deterministic rules with autonomous AI agents and AST-based parsing.
The platform identified:
- Modernization readiness through 0-100% scoring
- Calculated technical debt
- Detected security vulnerabilities via integrated CVE scanning
- Evaluated cloud-readiness and scalability
- Identified blockers and boosters for prioritization
- Generated effort estimates with risk assessment
Framework and Architecture Transformation
Migrated from .NET Framework 4.8 to .NET 8 (Core), converting legacy ASP.NET Web Forms to a modern architecture while preserving the existing 3-tier logical structure with cloud-native operational patterns applied throughout.
Database Re-Platforming
Migrated from Microsoft SQL Server 2008 to Amazon Aurora PostgreSQL, converting the full schema, rewriting all stored procedures to PostgreSQL-compatible syntax, and executing a complete data migration preserving all historical records with comprehensive validation checks.
Implementation Excellence
Phase 1: Discovery and Assessment
Concierto Compass delivered automated discovery through dual-engine scanning, identifying dependencies, code composition, and modernization readiness. This established the transformation roadmap, target state architecture, and migration strategy across application, database, and infrastructure components.
Phase 2: Transformation Execution
Concierto Studio executed transformation across parallel workstreams:
- Application modernization to .NET 8 on AWS Fargate
- Database conversion to Aurora PostgreSQL with full stored procedure rewriting
- Infrastructure provisioning via Terraform Infrastructure as Code
- Source code migration from TFS to GitHub Enterprise with automated CI/CD pipelines on AWS CodePipeline and CodeBuild
Phase 3: Validation and Delivery
Comprehensive testing across unit, functional, and system dimensions confirmed:
- Zero data loss
- Security compliance with AWS Well-Architected Framework
- Holistic demonstration and documented findings for the broader modernization roadmap
Transformation Results
Cloud-Native Application Delivery
Legacy .NET Framework application fully transformed to .NET 8 running on AWS Fargate containers with cloud-native operational patterns.
Database Modernization
Complete migration from SQL Server 2008 to Aurora PostgreSQL with all stored procedures converted and validated, preserving full historical data integrity.
Infrastructure Automation
All AWS infrastructure provisioned through Terraform, enabling repeatable deployments with zero manual steps.
DevOps Maturity
End-to-end CI/CD pipelines automated the entire build, test, and deployment lifecycle via GitHub-integrated delivery.
Security and Compliance
Containerized environment secured with least-privilege IAM roles, secrets management, and hardening aligned to organizational and AWS Well-Architected best practices.
Platform Technology Excellence
Concierto Modernize Architecture
- Compass Assessment: Dual-engine scanning combining 5,000+ deterministic rules with autonomous AI agents, AST-based parsing, modernization readiness scoring, CVE detection, technical debt calculation, and effort estimation with risk assessment
- Framework Upgrade Pathway: Migration from .NET Framework 4.8 to .NET 8 (Core) with modern architecture patterns
- Containerization Pathway: Application refactoring for AWS Fargate deployment with cloud-native operational configuration
- Dual-Engine Intelligence: Deterministic rules ensure predictable, auditable outcomes while AI agents provide intelligent augmentation for complex scenarios
Technology Stack
.NET 8, ASP.NET Core, Amazon Aurora PostgreSQL, AWS Fargate, Amazon ECS, Terraform, AWS CodePipeline, AWS CodeBuild, GitHub Enterprise, AWS Secrets Manager, AWS WAF, VPC Security Groups, IAM
Key Differentiators
- Integrated Assessment + Transformation: Single platform from discovery through cloud-native delivery
- Accelerated Timeline: End-to-end modernization in weeks versus months with traditional approaches
- Complete Database Transformation: Full schema conversion, stored procedure rewriting, and data migration with zero data loss
- Repeatable Modernization Blueprint: Proven pathway scalable across the organization's broader application portfolio
- Security-First Approach: Integrated CVE scanning and vulnerability detection throughout assessment and transformation
Future Roadmap
Portfolio-Scale Modernization
Extending cloud-native modernization across additional legacy applications leveraging the proven methodology and transformation patterns.
Enhanced Authentication
Integration with enterprise single sign-on to replace forms-based authentication with centralized identity management.
Advanced Observability
Distributed tracing, custom dashboards, and enhanced operational intelligence for the modernized application landscape.
Why Leading Enterprises Choose Concierto
This modernization success demonstrates why organizations select Concierto for critical application transformation. The platform's dual-engine architecture — 5,000+ deterministic rules combined with autonomous AI agents — ensures predictable outcomes across six modernization pathways with enterprise-grade governance. Support for C#/.NET, Java, and seven additional enterprise languages enables consistent modernization across diverse technology portfolios.
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