AWS Senior .NET Modernization Engineer

About Nimbus Data Systems (Aligned TG) Aligned TG empowers organizations to harness the full potential of AWS cloud technologies, driving secure, scalable, and sustainable business outcomes. We approach every challenge with grit, embracing a results-driven mindset to ensure our clients achieve their goals. Our mission is to deliver unparalleled cloud advisory, engineering, financial management, and security services while continuously learning and innovating to stay ahead of industry advancements. Guided by a culture of collaboration and humility—where being "Team AWSome" means leaving egos at the door—we tailor our services to meet the unique needs of technology-enabled startups, mid-market, and enterprise clients. With a focus on execution, agility, and excellence, we are the trusted partner businesses rely on to navigate the complexities of cloud modernization and achieve their strategic objectives. Senior .NET Modernization Engineer Position Summary Nimbus Data Systems (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 Why Join ATG? At Nimbus Data Systems , you'll work alongside cloud, data, AI, and modernization experts helping customers solve complex technical challenges. We partner closely with AWS to deliver transformational outcomes while providing opportunities to work with cutting-edge cloud technologies, modernization programs, and enterprise-scale initiatives. Originally posted on Himalayas