Won Choi Email & Phone Number

Fairfax, Virginia, Us

Provide technical subject matter expertise to development and operations teams.Communicate architectural decisions and mentoring other technical staff.Provide guidance on securely migrating, re-platforming applications and services in on-premise and cloud infrastructures.Designed, deployed, and managed highly available microservices and traditional virtual machine workloads on cloud environments in AWS GovCloud using infrastructure as code (primarily Terraform, Ansible and Puppet) and Kubernetes. Developed the cloud network architecture for the platform (Fortigate, NGINX/F5, AWS VPCs, peering connections, etc.) and integration with customer networks.Developed continuous integration and deployment pipelines using tools such as Jenkins, SonarQube, Nexus Lifecycle and Fortify. Provide guidance on computer engineering and computer systems analysis support for the development of an enterprise security architecture.Develop a system security model and perform analysis of security services for existing and planned cloud infrastructures.Integrate security tools into CI/CD pipelines and leverage automation as well as further build and adapt tools to automate other aspects of security operations.Develop, harden and integrate infrastructure as code (IaC) assets using Terraform, Packer and Ansible for DoD and Federal customers.

Fairfax, Virginia, Us

Managed and mentored devops engineers, developers and database administrators for corporate and contract project activities. Provided guidance to contract and corporate departments.Developed cloud architecture and performed migration of .NET application workloads to AWS GovCloud.Engineered and deployed multiple customer systems to Amazon Web Services EC2 and associated platform tools.Cloud architect for AWS GovCloud migration and modernization effort designing VDMS and VDSS enclaves to secure DOD IL4 workloads.Lead DevOps engineer responsible for WebLogic CI/CD pipeline utilizing Jenkins to support cloud and local development environment automation utilizing a mix of shell, Homebrew, Vagrant, Docker and Puppet components.Senior architect and engineer for the Army program working to migrate and modernize the suite of C# ASP.net applications for operations at a new hosting facility. Working closely with development teams, cyber security and datacenter teams to assess, rearchitect and refactor applications for the new datacenter.Developed custom PowerShell based deployment tools to perform fully scripted web server deployments and configure databases, as well as perform automated code deployments.Developed various automated processes to aggregate disparate system information and provide a unified view for reporting utilizing SQL Reporting Services and custom applications and scripts.Developed and executed BMC Footprints service desk data migration of over 1M tickets and associated metadata from legacy ticket system using custom developed application to migrate content using Footprints API and direct SQL queries.

Fairfax, Virginia, Us

Managed and mentored diverse teams within the corporate and contract IT groups. Direct reports from all corporate and contract IT departments. Reported directly to CIO.Led and provided principal engineering support for the transition of ~2500 employees/contractors to Office 365. Active Directory synchronization, Exchange and Lync migration and PSTN service cutover.Developed workflow automation solution utilizing COTS product ProcessMaker, coupled with custom backend applications to handle common activities such as user provisioning/deprovisioning, group management, multifactor reset, etc. Significantly reduced workload for corporate IT team and provided rapid fulfillment for end users of the system such as HR.Designed and led engineering team to transition existing contact center with approximately 120 employees as part of company acquisition. Migration of VOIP telephony services, on premise services, upgrade of network infrastructure, endpoints, etc. Project start to completion within two months. All contact center functions were transitioned without any loss or degradation of service.Designed and led the buildout and enablement of a new secure multitenant contact center supporting up to 160 employees for federal customers.Implemented IT governance controls to meet accounting compliance requirements. (SOX and ITGC)Served as the lead engineer for new disaster recovery site deployment, configuration of networking, server infrastructure and storage.Served as the lead engineer for security accreditation activities related to various federal customers for facility and infrastructure.

Fairfax, Virginia, Us

Managed team of IT administrators and DBAs for contract environments. Directly involved in Server 2008/IIS 7/SQL 2008 deployment and supporting infrastructure development for Army infrastructure migration.Designed and implemented COOP disaster recovery infrastructure for large Army program.Established requirements and specifications for DHA system network redesign and migration.Coordinated and successfully completed DHA program infrastructure and application migration ahead of schedule with minimal downtime.Developed large VMware cluster design and responsible for administration in a managed IBM blade environment.Served as a primary escalation point for high level infrastructure issues.

Fairfax, Virginia, Us

Developed group policies to ensure DoD STIG compliance and worked closely with IA team to perform vulnerability assessments on accredited systems (Gold Disk, Retina, manual checks) and prepare POA&M documentation.Developed custom applications and logic to monitor systems and apply automated remediation procedures using PowerShell and cmd shell scripting.Setup SCCM and SCOM for monitoring and administration of SQL failover clusters, file shares, and web servers.

Fairfax, Virginia , Us

Technical training instructor for the Volgenau School of Engineering's TechAdvance IT professional development programs, teaching CISSP and other IT/security certifications.

New Braunfels, Texas, Us

Instructor for various Microsoft and CompTIA certifications.Developed custom courseware for corporate VMware Configuration and Administration training events.General classroom management and instruction.

Washington, Dc, Us

Lead design engineer and project manager for Hyper-V virtualization migration project for large area catering company. Migrated from SBS 2003 and BES 4.0 to Server 2008/Exchange 2007 with BES 5.0. Implemented Hyper V failover cluster, clustered file, print, DHCP services, and Exchange 2007 CCR for high availability.Mentored junior engineers and played a role as a technical resource, as well as provided guidance to them on best practices and established SOPs.Lead project manager for five clients ranging from about twenty to over fifty users and a secondary lead for another five clients of similar size with high client satisfaction ratings.Coordinated with clients to ascertain client needs and pinpoint specific areas of interest; determined best processes to resolve each issue in a timely and appropriate manner.Produced various project and sales proposals, systems documentation, project implementation guidelines, and purchasing recommendations reports for clients.

M.S., Information Systems

B.S., Biology