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.Net Architect

IntraedgePhoenix, AZ🇺🇸United States

Quick overview

SeniorityMid Senior
Work modeHybrid
LocationPhoenix, AZ, United States
DockerMicroservicesSQLGitAWSC#CDKCOBOLCloudFormation.NETASP.NETGitHub ActionsReconciliationSchedulingTerraformRESTAzureSQL ServerCI/CDAzure DevOpsIAM

Job description

Role Overview
We are seeking a hands-on .NET Architect / Technical Lead to lead the modernization of legacy mainframe applications into secure, scalable, and maintainable .NET applications on AWS.
The role requires strong expertise in C#, modern .NET, Blazor, SQL Server, and AWS. The candidate will own application architecture, hands-on development, technical delivery, and modernization quality while collaborating with mainframe specialists, UX designers, and business stakeholders.
Prior mainframe modernization experience is preferred but not mandatory.
Key Responsibilities
  • Lead architecture, design, and hands-on development using C#, .NET 10, ASP.NET Core, and Blazor.
  • Apply domain-driven design (DDD) to define business domains and appropriate modular or microservices architectures.
  • Design REST APIs, asynchronous workflows, messaging integrations, and resilient distributed applications.
  • Modernize legacy mainframe screens into intuitive, responsive Blazor-based applications, improving user experience rather than simply replicating existing screens.
  • Collaborate with mainframe SMEs to understand COBOL programs, CICS transactions, JCL jobs, business rules, data structures, and application dependencies.
  • Ensure functional equivalence between legacy and modernized applications through automated regression testing, output comparison, and data reconciliation.
  • Design and deploy applications on AWS using appropriate services such as ECS/Fargate, Lambda, RDS SQL Server, S3, SQS, EventBridge, and Step Functions.
  • Lead SQL Server database design, data migration, query optimization, and transaction management.
  • Modernize batch processing and file-based integrations with scheduling, restartability, and exception handling.
  • Implement application security, authentication, role-based authorization, audit logging, and AWS IAM controls.
  • Establish CI/CD pipelines, infrastructure as code, automated testing, monitoring, and observability.
  • Lead technical reviews, mentor developers, resolve complex issues, and ensure engineering quality.
  • Support migration planning, parallel validation, production cutover, rollback, and operational handover.
  • Evaluate and use AI-assisted development and modernization tools with appropriate validation and quality controls.
Job Requirements
Required Qualifications
  • 10+ years of software development experience, including 3+ years in technical leadership or architecture roles.
  • Strong hands-on expertise in C#, ASP.NET Core, modern .NET, and enterprise application architecture.
  • Production experience with Blazor, including reusable components, forms, validation, state management, and API integration.
  • Strong understanding of domain-driven design, REST APIs, modular architecture, and microservices.
  • Experience designing, deploying, and supporting production applications on AWS.
  • Strong SQL Server skills, including schema design, query optimization, indexing, and transaction management.
  • Experience with Entity Framework Core, Dapper, or equivalent data access technologies.
  • Experience with distributed systems, asynchronous messaging, resiliency, and transaction consistency.
  • Experience with Docker, CI/CD pipelines, Git, and infrastructure as code.
  • Strong understanding of application security, authentication, authorization, and automated testing.
  • Ability to lead architecture decisions, mentor engineers, and remain hands-on with development and troubleshooting.
Preferred Qualifications
  • Experience modernizing mainframe or other legacy enterprise applications.
  • Familiarity with COBOL, JCL, CICS, VSAM, copybooks, and legacy data formats such as EBCDIC and packed decimal.
  • Experience with AWS Transform for mainframe or equivalent modernization tools.
  • Experience with Amazon RDS for SQL Server, ECS/Fargate, Lambda, SQS, EventBridge, and Step Functions.
  • Experience with functional-equivalence testing, batch reconciliation, parallel runs, and migration cutover.
  • Experience with Terraform, AWS CDK, CloudFormation, Azure DevOps, or GitHub Actions.
  • Experience using AI-assisted development or code-conversion tools.

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