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, DevOps, 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 / WebForms) Analyze and document legacy ASP.NET WebForms 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 Engineering Standards Conduct comprehensive code reviews focused on maintainability, security, architectural alignment, and operational risk. Define and maintain engineering standards across legacy and modern technology environments. Lead Static Application Security Testing (SAST) and Software Composition Analysis (SCA) remediation activities. Identify and resolve security vulnerabilities, dependency risks, and code quality issues during migration and modernization. Promote maintainable, secure, and reliable engineering practices. 6. Cross-Functional Collaboration Partner with Infrastructure and Operations teams on critical activities, including provisioning, networking, DataPower, DNS, and certificate management. Collaborate with DevSecOps teams to maintain deployment pipelines, secrets management, certificate rotation, and security scanning. Engage Architecture, Security, and Site Reliability Engineering (SRE) teams early to identify risks and resolve implementation challenges. Work with shared-platform teams to establish clear ownership and execution responsibilities across dependent systems. Communicate technical plans, risks, dependencies, decisions, and timelines effectively to engineering leadership, project management, and PMO stakeholders. 7. Continuous Improvement Identify opportunities for automation, consolidation, operational efficiency, and cost optimization across applications, integrations, and batch processes. Identify overlapping initiatives and align responsibilities across teams to reduce duplication of effort. Recommend improvements to deployment processes, operational reliability, and application support practices. Required Qualifications Technical Expertise 10+ years of hands-on .NET development experience. Strong expertise in .NET Framework 3.5/4.x, ASP.NET WebForms, ASPX, IIS, configuration management, session-state internals, and legacy UI frameworks. Experience with .NET Remoting or similar legacy integration technologies. Strong SQL Server skills, including database analysis, performance optimization, and deployment automation. Proven experience delivering infrastructure migrations, platform upgrades, or cloud transition initiatives. Working knowledge of AWS services, networking fundamentals, connectivity models, and cloud cost considerations. Experience with CI/CD and deployment platforms such as Octopus Deploy, GitHub Actions, or equivalent tools. Ability to analyze decompiled code and troubleshoot complex systems with limited documentation. Experience with application deployment, environment promotion, production cutovers, and rollback planning. Technical Leadership and Delivery Demonstrated ownership of legacy applications and enterprise platforms through compliance-driven initiatives, operating system upgrades, security remediation, or audit-related programs. Strong code review practices and the ability to make sound technical decisions under delivery and operational constraints. Excellent written communication skills, including technical decision documents, acceptance criteria, technical specifications, and Jira-ready backlogs. Proven ability to drive infrastructure and operational dependencies to completion through collaboration, issue resolution, and escalation. Experience developing and presenting phased modernization strategies to technical and non-technical stakeholders. Ability to balance hands-on development with architectural ownership, technical problem-solving, and delivery accountability. Nice-to-Have Qualifications Experience with internal enterprise frameworks, WebForms-based platforms, and Client scheduling environments. Background in security remediation, including SQL injection, Cross-Site Request Forgery (CSRF), Cross-Site Scripting (XSS), dependency management, and SAST/SCA findings. Experience evaluating Angular and .NET API solutions or Python-based integration and batch-processing architectures as modernization targets. Experience modernizing legacy applications and integrating enterprise workloads with AWS services. Piyush Chowdhary Sr. Delivery Manager/Account Manager Tanisha Systems Inc Desk no. View phone number on us.fitly.work Email: View email address on us.fitly.work Web: Linkedin URL: Piyush Chowdhary - Irvine, California, United States | Professional Profile | LinkedIn Address:99 Wood Ave South Suite # 308,Iselin, NJ 08830 E-Verify, Certified Minority Business Enterprise MBE, Dun & Bradstreet CREDIBILITY "Tanisha Systems, Inc. is an Equal Employment Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, (including pregnancy, childbirth, or related medical conditions), sexual orientation, national origin, *, physical or mental disability, or any other status protected by applicable federal, state, or local law. We are committed to providing an accessible work environment for all candidates. Reasonable accommodation will be provided during the application and hiring process upon request."