Lead .NET Developer – AWS

Hi, Hope You are doing well. This is Piyush from Tanisha Systems. I have a job opportunity for you, if you are interested, please share your Resume and details ASAP.

Job Title:

Lead .NET Developer – AWS

Location:

Austin, TX / Fort Mill, SC

Employment Type:

Full-Time

Experience:

10+ years Job Overview We are seeking an experienced Lead .NET Developer with strong hands-on expertise in legacy .NET application analysis, technical leadership, infrastructure migration, and AWS. This role requires active involvement in code development, application reverse engineering, architectural decision-making, troubleshooting, and delivery execution. The successful candidate will take ownership of the platform’s technical direction, system reliability, migration activities, code quality, and modernization roadmap.

This is a hands-on technical leadership position that requires the ability to solve complex engineering challenges while collaborating with infrastructure, security, Dev Ops, architecture, and business teams.

Key Responsibilities 1. Technical Ownership Own the technical direction, stability, and delivery of ATDB.Web and its seven supporting services, including five Client-scheduled batch jobs, the Import Service, and the Notification Response Service. Make and justify critical technical decisions, including build-versus-buy, remediation-versus-rebuild, and migration sequencing, while meeting timelines and governance requirements. Serve as the primary technical escalation point, resolving complex issues and identifying blockers, dependencies, and ownership.

Contribute directly to development, code reviews, troubleshooting, and architectural decisions.
2. Legacy Application Analysis (.NET Framework 3.5 / ASPX / Web Forms) Analyze and document legacy ASP.NET Web Forms applications by reviewing source code, decompiled assemblies, .NET Remoting implementations, session management, configuration settings, and legacy UI components. Validate system behavior and infrastructure configurations using deployment tools, monitoring platforms, and available technical documentation. Translate technical findings into clear specifications, acceptance criteria, and test scenarios for QA and business stakeholders.

Troubleshoot complex application issues in environments with limited documentation.
3. Infrastructure Migration Execution Lead operating system and infrastructure migration activities using a low-risk, minimal-change approach that meets compliance deadlines while minimizing regression risk. Evaluate on-premises and AWS hosting options based on connectivity, performance, deployment compatibility, cost, and operational risk. Manage the complete deployment and promotion lifecycle across environments, including infrastructure provisioning, network changes, DNS updates, and scheduler reconfiguration. Develop, test, and maintain cutover and rollback procedures to support reliable production transitions.

Collaborate with infrastructure and operations teams to resolve migration dependencies and maintain system availability.
4. Modernization Strategy Develop short-term stabilization plans and long-term modernization roadmaps, distinguishing essential deliverables from deferred enhancements. Identify opportunities for API enablement, cloud-native services, application rebuilds, and AWS-based integration solutions. Translate modernization initiatives into structured Jira backlogs with defined priorities, dependencies, acceptance criteria, and implementation plans. Incorporate technical debt, security concerns, and audit findings into modernization planning. Recommend practical approaches that balance modernization goals, business continuity, delivery timelines, and legacy system constraints.

5. Code Quality and…