Senior .NET Modernization Engineer

Position Summary

Aligned Technology Group (ATG) is seeking a Senior .NET Modernization Engineer to lead enterprise application modernization initiatives for public sector and commercial customers. This role will focus on transforming legacy .NET Framework applications into modern, cloud-native solutions running on AWS. The ideal candidate combines deep .NET development expertise with experience modernizing large-scale applications, implementing cloud best practices, and collaborating with cross-functional engineering teams.

As a Senior .NET Modernization Engineer, you will play a key role in helping organizations accelerate digital transformation by refactoring legacy applications, improving scalability and maintainability, and preparing workloads for containerization and cloud-native deployment models.

Responsibilities

Modernize enterprise applications from .NET Framework to .NET 8 and .NET Core

Analyze existing application architectures and develop modernization strategies

Refactor legacy codebases to support cloud-native architectures and AWS best practices

Identify and remediate application dependencies, third-party libraries, and NuGet package compatibility issues

Migrate legacy ASP.NET applications to modern frameworks and development patterns

Develop and enhance RESTful APIs and microservices architectures

Implement application logging, monitoring, observability, and security controls

Collaborate with DevOps engineers to integrate applications into CI/CD pipelines

Support containerization initiatives using Docker and Kubernetes platforms such as Amazon EKS

Perform code reviews and mentor junior developers on modernization best practices

Troubleshoot complex application issues and provide technical leadership throughout modernization efforts

Develop technical documentation, migration runbooks, and knowledge transfer materials

Required Qualifications

5+ years of software engineering experience with C# and .NET technologies

Strong experience with both .NET Framework and .NET Core/.NET 8

Experience modernizing or migrating legacy enterprise applications

Strong understanding of object-oriented design principles and software architecture patterns

Experience developing REST APIs and service-oriented architectures

Experience working with SQL Server and relational databases

Familiarity with source control systems such as Git

Experience participating in Agile development environments

Strong communication and problem-solving skills

Preferred Qualifications

Experience working with AWS cloud services

Experience with containerization technologies such as Docker and Kubernetes

Familiarity with Infrastructure as Code (Terraform, CloudFormation, AWS CDK)

Experience with CI/CD platforms and automated testing frameworks

Experience modernizing applications within government, healthcare, or highly regulated environments

Knowledge of microservices and event-driven architectures

Certifications

Preferred but not required:

AWS Certified Developer - Associate

AWS Certified Solutions Architect - Associate

AWS Certified DevOps Engineer - Professional