Senior .NET Application Architect

Senior  Application Architect

Location: [Location(s) ] – USA – East Coast , Preferably Herndon,VA

Employment Type:  6 months Contract to hire

Work Mode             : 3 days from Office / 2 days Remote

Key Responsibilities 

Application Portfolio Assessment

• Lead large-scale application portfolio discovery and assessment engagements across enterprise client environments — covering 100s to 1000s of applications spanning Java, .NET, legacy frameworks, packaged COTS applications, and custom-built systems
• Design and execute application assessment frameworks covering Technical health, cloud readiness, containerization / serverless readiness and potential modernization pathways
• Conduct and Lead application dependency mapping and integration topology analysis
• Lead technical interviews and workshops with client development, operations, and architecture teams to supplement automated discovery data with qualitative context
• Produce formal Application Assessment Reports with executive summary, portfolio heat maps, technical findings, R-Treatment recommendations, and migration / modernization readiness scores per application

Large-Scale Application Migration & Modernization Architecture

• Design target state cloud architectures for complex, multi-tier enterprise applications — spanning web, middleware, and database layers across Java, .NET, and polyglot environments
• Architect DevSecOps transformation pipelines including CI/CD design, automated testing integration, security scanning, and GitOps adoption for modernized application platforms

Migration Strategy & R-Treatment Decision Making

• Develop and apply structured R-Treatment decision frameworks based on business value, technical health, cloud fit, and strategic priority
• Define application placement strategies with precision — prescribing the right modernization treatment for each application across the 7-Rs
• Design migration sequencing and wave planning strategies — balancing business priority, technical dependency order, risk concentration, and delivery team capacity across multi-year migration programs
• Develop risk registers for migration programs, identifying application-level technical risks, integration risks, data migration dependencies, and organizational change management considerations

Modernization Roadmap Development

• Translate assessment findings and migration strategy decisions into detailed, milestone driven, multi-horizon modernization roadmaps
• Prepare business case for modernization roadmaps — quantifying expected outcomes while aligning them to Client organizational constraints
• Develop application-level effort estimation models tied to migration wave plans — providing granular, defensible estimates by treatment type, application complexity, and integration scope

Platform & Practice Development

• Own the assessment and roadmap solutioning narrative for proposals — from discovery scoping through roadmap presentation and commercial structuring
• Lead and support technical solution defense sessions with clients, AWS alliance teams, and partner organizations with confidence

• Collaborate with the Solutions team to build and continuously refine reusable assessment and strategy assets
• Support GenAI-assisted assessment tooling development including automated code analysis, dependency extraction, and cloud readiness scoring acceleration
• Support POC development and platform demo execution, on need basis

Ideal Candidate Profile 

• 15+ years of overall IT experience with with minimum  5 plus as an Enterprise Architect or Cloud Architect in large-scale environment
• 8–12 years of experience in application architecture with a clear, demonstrated specialization in application portfolio assessment, migration strategy, and modernization roadmap development at enterprise scale
• Proven experience leading application assessment engagements for large enterprise clients with portfolios of 50–1000+ applications across heterogeneous technology landscapes
• Deep expertise in R-Treatment decision frameworks — ability to independently assess, classify, and prescribe modernization treatment for diverse application types with clear, defensible rationale
• Strong understanding of application placement strategy across containerization, serverless, re-platform, and rearchitect patterns — with ability to articulate trade-offs at both technical and business levels
• Hands-on knowledge of application discovery and assessment tooling such as MGN, CAST, Dynatrace, App Dynamics, SonarQube, Veracode and AWS X-Ray
• Strong understanding of cloud-native architecture patterns: microservices, containers (Docker/Kubernetes/OpenShift), serverless (Lambda, API Gateway), event-driven design, and API-first principles — sufficient to assess application fitness for each pattern and design the target architecture
• Experience with DevSecOps toolchains (Jenkins, GitHub Actions, ADO, Terraform, CloudFormation) and ability to define DevSecOps enablement as part of migration roadmaps
• Strong business case development skills — ability to construct TCO models, ROI analyses, and modernization investment justifications for executive audiences
• Excellent written communication and presentation skills — able to produce and present board-quality assessment reports, portfolio heat maps, and roadmap decks
• Proven ability to operate in onsite-offshore engagement models with direct CxO and technical stakeholder engagement
• Prior consulting or pre-sales solutioning experience is strongly preferred
• Technical Skills
• 7+ years of hands-on development experience with .NET Framework / .NET Core and Java (Spring / J2EE).
• 5+ years of experience with enterprise databases, including Oracle, SQL Server, MySQL, and PostgreSQL.
• Strong understanding of application architecture patterns, microservices, APIs, and distributed systems.
• Familiarity with cloud-native architectures, containerization, and modern application frameworks is a plus.
• Cloud Expertise
• Strong experience with AWS cloud services and migration best practices.

Education:

• Bachelor''s degree in Computer Science, Electrical Engineering, or related field.
• AWS Certified Solutions Architect – Professional preferred.
• Additional certifications such as AWS Certified DevOps Engineer, AWS Certified Security – Specialty, or AWS Certified Advanced Networking – Specialty are a plus.