Computer Science System Administrator

BANDULA KARUNARATNA

Ashburn, VA. 703-***-**** / ******@*****.***

Extensive experience, knowledge, state-of-the-art skills, versatility, team spirit, & hardworking attitude to administer operating systems, hardware & maintain systems.

EDUCATION

Master of Science in Computer Science - The George Washington University, DC

Bachelor of Science in Computer Science - University of Houston, Clear Lake, Texas

Associated Degree in Computer Science - Institute of Technological Studies, Sri Lanka

Diploma in Computer System Design - National Institute of Business Management, Sri Lanka

SKILLS

Over 15 years of strong experience as an Infrastructure Support/ System Administrator & Production Support of various applications on SUN Solaris, RedHat Linux, AIX environment.

Experience on Solaris 11/10/ 9/8/7 & RHEL 4/5/6/7/9 implementation, administration, installation & maintenance.

Experience in administering and managing Windows Server 2008/2012/2016/2019.

Full Life-cycle development, including functional analysis, design, development & testing.

Gitlab JIRA Jenkins CI/CD, Tomcat.

Data modeling using E-R diagrams

Data warehousing

Designing graphical user interfaces

Network administration

Database performance tuning

Disaster recovery planning

Database monitoring & troubleshooting

Exceptional teamwork skills.

Good client interface skills.

EXPERIENCE

Systems Engineer and Advisor

DHS, DC May 2020 - Present

The Office of Biometric Identity Management (OBIM) spearheads the U.S. Department of Homeland Security’s (DHS) efforts to enhance identity management for a safer world and improved quality of life. Through cutting-edge solutions, OBIM optimizes the verification and authentication of identities. In this role, *Biometric Identity Verification* involves expertly managing and operating advanced biometric systems to securely and efficiently verify individuals, ensuring seamless processing for both domestic and international travelers.

System Optimization and Troubleshooting: Proactively monitor and resolve technical issues within OBIM systems, ensuring minimal downtime and maintaining operational continuity. supporting 24x7, mission essential systems.

Participate in the systems engineering, script development, integration, testing and validation, and all aspects of the cycle, involving extensive messaging and transaction processing. Use internal tools to monitor queue depts, alerts and information messages, and logs.

Compliance with Federal Regulations: Ensure strict adherence to DHS and federal security standards while handling sensitive biometric data, maintaining the integrity and confidentiality of identity verification processes.

Interagency Collaboration: Worked closely with federal agencies, including CBP, FBI, TSA, DEPT of STATE, and ICE, to facilitate seamless data sharing and improve cross-agency coordination for enhanced security and operational efficiency.

Crisis Management and Response: Played a key role in addressing and resolving high-priority incidents related to biometric identity verification, ensuring timely and accurate resolution, diagnose and fix issues in existing application components.

Assist the production support team with the day-to-day standard ticketing requests and reports, Ensure system operation continues within SLAs, Perform tuning of the system and troubleshooting issues.

Experience with Unix, Linux RHEL, AIX Environment. Working with Unix commands. Scripting knowledge (batch, shell or Perl ). Knowledge of Oracle, SQL, PL/SQL as this is the back-end database for the system.

Experience with infrastructure team installation, configuration and administration on Linux/Unix servers, and package management using RedHat RPM/YUM.

Experience in Troubleshooting, Security, Backup, Disaster Recovery, Performance Monitoring and Fine-tunning on UNIX Red Hat Linux Systems, and maintain Kubernetes infrastructure.

Experience with deployments, integration, automation, testing and AGILE practices.

Experience with TIBCO application such as Business Works and EMS. Experience with Oracle WebLogic. Experience with f5 LTM and GTM. Configured and managed TCP/IP, DHCP, DNS, ITIL, O365 and Active Directory.

Perform other duties as assigned Roles and Responsibilities & Expectations include: Ability to work independently and/or as part of a team.

Self-starter, motivated individual with attention to detail, able to work under pressure.

Excellent written and verbal communication skills and working with government support personnel, service delivery agents, development team, and technical support engineers to identify root causes and ensure SLAs and SLOs are met.

I do have active secret clearance form DHS(Department of Homeland Security)/CBP.

Infrastructure Support/ Systems Administrator

BT, USA Jun 2015 – Jan 2020

Worked as a team member & supporting global banking financial market & S&P portfolios.

Administered operating systems, hardware, & peripheral components effect on the environment.

Responsible for installation, configuration, & administration of RedHat Linux and Solaris systems.

Configured various services, devices as well as applications of UNIX(Solaris)/ Linux (RHEL) servers & worked with application team to customize the environment. Worked with Apache & developed several UNIX scripts to automate tasks, Tomcat system administration.

Developed, customized & build packages on Solaris & rpms on Linux for deployment on various servers through software development life cycle.

Installed & configured HP SPP on HP proline running on Linux servers. Upgraded firmware & patches on Solaris & HP servers.

Secured & hardened the environments using GAUSS/NIST software.

Responsible for daily operations of the enterprise Data Center(EDC) and Secondary Data Center(SDC), virtual infrastructure environment that includes VMware and Hyper-V products.

Responsible Windows Server installs, configure and support Active Directory, DNS, DHCP, WINS. Experiences with services such as DNS, SMTP, SNMP, SSL, VOIP, ITIL, ACTIVE DIRECTORY, O365 and SSH.

Troubleshot & resolved problems & responding to user’s requests using ServiceNow.

Configured InfiniBand & Mellanox network adapters.

Worked on Ansible and Ansible tower as configuration management tools, to automate repetitive tasks, quickly deploys critical applications, spin up nodes in AWS and managing changes using Ansible Playbooks.

Implemented & managed Veritas Cluster Service (VCS) to ensure high availability of critical applications & databases.

Configured VCS clusters for failover & load balancing across multiple nodes, reducing downtime by 30%.

Troubleshot & resolved issues related to VCS configuration, resource dependencies, & cluster communication.

Monitored & troubleshot complex issues in the environment using many tools such as TIBCO, WebLogic etc., on UNIX/ Linux servers.

Supported Oracle Linux system which runs Oracle 11g/ 12c. Wrote MSSQL, PL/SQL scripts, C/C++ & installed packages as needed.

Provided administrative support & maintenance on Oracle 10g, 11g, 12c installations, database creation, database security, database optimization & tuning.

Applied extensive technical expertise & has full knowledge of other related disciplines, Gitlab, JIRA, Jenkins for CI/CD.

Wrote basic Shell scripts using ksh, bash, perl, for process automation of databases, applications, backup & scheduling. maintain the cronjobs, legacy scripts.

Compared the strength, weakness, storage services, backup services & SLAs on AWS vs Azure vs GCP cloud services.

Working closely with the senior developers, script development, integration, testing and validation, testing. AGILE practices established within the team.

Infrastructure Support/ Systems Administrator

DOT, DC May 2011 – Jun 2015

Administered all Solaris/ Oracle Unix Linux-RedHat servers in Research & Innovative Technology Administration (RITA) in DOT. (SUN T52xx, V series, M4000/ M5000/ M9000, T3s T4s, T5s)

Tuned systems to make sure of the optimum level of performance. Keep track of the appropriate software upgrade software packages. Critical production support for existing JAVA/ J2EE applications. Oracle Solaris (7, 8, 9, 10, 11). Experienced in ILOM, ALOM, XSCF.

Installed, configured the modern LDOM, Zones Virtualization on servers. Assisted LAMP servers for Terremark cloud environment. Tomcat system administration.

Implemented, managed & provided technical leadership for security & privacy of sensitive unclassified information in Federal computer systems. Work with ISSOs to mitigate security vulnerabilities.

Hardened servers according to government regulations, using NIST, STIG, FISMA, DOD/ DHS technical measurement & Benchmark guidelines for the cost-effective security & privacy of sensitive unclassified information in federal computer systems. Vulnerability assessment/Mitigation.

Interacted with the clients to discuss problems & requests regarding the complex system issues.

Created Inventories & document on all Unix/Linux(RHEL) servers, & storages, networks & necessary data center information.

Built new servers introducing new technologies, vitalizations, ZFS file systems, etc. Application server administration for maximum throughput, operations and data flow.

Upgraded firmware & hardware on many Solaris servers & windows servers.

Resolved problems across multiple platforms (Windows/Linux/Red Hat) and technologies, Active Directory, Group Policy, Azure AD, DNS, DHCP, Exchange. DNS, SMTP, SNMP, SSL and SSH. Configured and managed TCP/IP, DHCP, DNS, ITIL, ACTIVE DIRECTORY, O365 and Active Directory.

Experienced with VMware tools -VMware ESXi4.0/5.1/5.5, VCenter, Horizon View, Unix Shell, C, C++ and SQL, Application, web server experience, configure and manage Windows services.

Conducted & analyzed cost of hardware & purchase hardware for RITA requirements. patching / upgrades.

Provided support with migrations on servers as well as application side.

Installed applications for vendors to fulfill DOT requirements. Install & configure Apache, Tomcat, Java, SAS, Perl, DBI, DBD, Rsync, Oracle clients, Oracle OID, OIM, OEM & WebLogic, etc.

Aided Developers, Programmers & DBAs to resolve their issues.

Configured StorageTek which is for the RITA storage requirements. Assisted in troubleshooting SAN issues such as initial storage configuration, drivers, path, storage failures, storage performance & resolved file system inconsistencies.

Implemented & managed VCS clusters for high availability of critical applications. Configured resource groups, service groups, & dependencies. Performed cluster failover & switchover drills. Troubleshot cluster-related issues, ensuring minimal downtime.

Copied data, mounting file systems, managing accounts & passwords, maintaining user requirements, modifying scripts, etc.

Troubleshot & resolved all issues for RITA. Provided technical advice to management for upgrades, purchases on hardware & software.

Involved with server move in Datacenter. Prepared options for all servers.

Supervised database security by assigning suitable responsibilities to diverse project employees, monitoring user accounts, creating groups, & granting access to users.

Monitored & executed RMAN backup & recovery, flashback technology, hot/ cold backups, redo log files & fast & recovering area.

Administrated general database including management of instances, redo logs, tablespaces, temp space, rollback/ undo segments & schema management.

Provided storage backup requirements & solutions for z13/ z14/ z15 IBM mainframes. Researched on landscape for z13/ z14/ z15 IBM mainframes. Provided backup solutions for zOS & with IBM Virtual Engines VE.

Compared new features on Hitachi VSP G1500/ F1500 vs Dell EMC PowerMax & VMAX vs IBM DS*xxx series storages, IBM MQ, Bitbucket.

Provided all pros & cons of IBM TS7700 family virtual tape storage for IBM Z data.

Collaborated with DevOps engineering teams to automate CI/CD pipelines, decreasing software release time, improving cross-team collaboration and streamlining process across different departments. Gitlab, JIRA, Jenkins for CI/CD.

Infrastructure Support/ Systems Administrator

FTC, DC Jan. 2011 – May 2011

Maintained systems by installing & upgrading the application packages.

Maintained existing programs/ scripts & extended Linux system functionality as needed.

Responsible for backups using Veritas NetBackup 7.0.

Installed & maintained Solaris zones & LDOMs for Data center virtualization.

Mastered on server virtualization, & assist others in performing on server virtualization

Platforms: Sun Solaris (7, 8, 9, 10), HP-UX (11.00, 11.11), AIX & Linux (RedHat)., ILO/ DRAC/ CMIC

Responsible for installing Solaris 10 utilizing Sun's Jumpstart utility.

Solaris Cluster 3.2 advanced administrations.

Troubleshot & resolved problems, & response to user’s requests.

Record admin activities & maintain admin logs.

Implemented secure remote access to applications. Configured network connectivity.

Infrastructure Support/ Systems Administrator

Census, MD Jun 2010 – Dec 2010

Administered operating systems, hardware, & peripheral components, evaluate new systems engineering technologies & effect on the operating environment.

Performed software installation, upgrades/ patches, troubleshooting, & maintenance on Unix/ Linux-RedHat/ HP UNIX/ AIX servers.

Administered Solaris zones & containers technology.

Cloud resources focus on maximizing the effectiveness of the shared resources.

Evaluated, configured & trouble shot issues related to software intended to ensure confidentiality, integrity & availability of automated information systems.

Wrote Shell & PERL scripts to provide automation.

Analyzed & resolved diagnostic problems on Systems.

Oversaw tuning & performance monitoring for UNIX/ Linux servers, & peripherals.

Troubleshot & resolved problems & responded to user’s requests using Remedy.

Resolved problems across multiple platforms (Windows/Linux) and technologies, Active Directory, Group Policy, Azure AD, DNS, DHCP, Exchange.

Knowledge of network protocols and technologies TCP/IP, DNS, DHCP, VPN, and Wi-Fi.

Experience on SUN T52xx, V Series, M3000/ M4000/ M5000, HP, DELL, IBM, Cisco.

Infrastructure Support/ Systems Administrator

Bureau of Labor Statistics, DC Oct 2008 – May 2010

Responsible for installing Solaris10 & configuring Sun Microsystems, Linux/ AIX/ HP UNIX.

Responsible for upgrading patches, performing daily system monitoring, verifying the integrity & availability of all hardware, resources, & key processes, reviewing system & application logs.

Applied BLS security check list & resolve issues, using Government guidelines.

Applied security management practices on Unix servers: & system hardening & supporting security policies, procedures & guidelines according to government standard guidelines (FISMA/ NITS/ DOD/ DHS/ etc.).

Created shell scripts & updated the scripts as per the requirement.

Administered Sun Cluster 3.1 Server, SunOne Web server, Apache, LDAP & Volume Manager Systems.

Troubleshot, monitored & reported on SAN/ LUN environment. Troubleshot SAN issues such as initial storage configuration, drivers, path, storage failures, storage performance & resolved file system inconsistencies.

Responsible for backups using Veritas NetBackup 6.5, installing software, NetBackup, & SAS.

Identified & analyzed systems requirements in response to client needs, risks & costs.

Provided expert advice on highly complex, unprecedented network issues.

Infrastructure Support/ Systems Administrator

Amtrak, VA Apr 2007 – Oct 2008

Monitored high level application software & hardware utilizing SiteScope, Fog-light & NetIQ monitoring tools.

Performed software installation, upgrades/ patches, troubleshooting, & maintenance on UNIX/ AIX/ Linux/ HP UNIX servers.

Installed & configured Veritas 3.2 for storage management for Oracle Database, Running systems on SAN.

Responsible for installing Solaris 9/ 10 utilizing Sun's Jumpstart utility, Legato client, (using a Shareware server), monitoring Legato Backups & restarting failed jobs.

Used bash, awk, sed & PERL to automate most of the daily activities ie. log monitoring, log rotation, purging & proactive systems monitoring including disk error detection.

Supervised, conducted & trained others in performing technical studies related to network performance.

Assisted in providing rack mounting, power & layout requirements.

Infrastructure Support/ Systems Administrator

Lockheed, (client: CMS MD) Sep 2005 – Feb 2008

As part of Lockheed Martin Information Technology’s Unix production team, I was responsible for ensuring the reliability, availability & serviceability of all Unix servers (Sun Microsystems, IBM AIX systems & HP UNIX) located in the data center of the Centers for Medicare & Medicaid services headquarters, MD.

Responsible for installing Solaris 9/ 10 utilizing Sun's Jumpstart utility.

Unix shell programming in Bourne & Kron shells, with Awk & PERL scripting languages.

Responsible for stopping/ restarting applications, with stopping/ cleaning/ restarting JVMs, MQs.

Monitored & resolved Tivoli Events & OPNET.

Generated help desk tickets, change tickets, troubleshot & resolved problem tickets as required.

Monitored Veritas, NetBackup events & resubmitted backups on failures

Responsible for patch management utilizing Sun Micro Systems updates, managed software, & rebooting process of all Sun Micro Systems.

Infrastructure Support/ Systems Administrator

Fannie Mae, DC Feb 2002 – Feb 2005

As part of the Unix production team, responsible for installation & production support of an environment consisting of Sun servers & desktops, used to support Fannie Mae’s portfolio.

Performed hardware installations & upgrades on Sun Enterprise hardware.

Built servers, installed Solaris OS on various Sun servers using jump-start technology.

Provided production support on Sun Solaris/ IBM AIX/ HP UNIX.

Supported Storage Area Network (SAN).

Resolved problem tickets generated by customers.

Wrote UNIX shell scripts to maintain system performance.

Worked with application developers to troubleshoot problems, supported Multi-tiered web-based systems & tune hardware to improve performance.

Reviewed & resolved conflicts associated with development & testing of network architecture & infrastructure, developed long-term & short-term technology implementation strategies to network management.

Performed UNIX system kernel changes to support the application environment.

Coordinated with Sun Microsystems in the event of hardware failures.

Hardware: Sun Solaris (Enterprise 250, 450, 420R, 5000, 6500, SunFire 6800/ 4800), AIX (M80, H70), Hitachi 9200

Programmer Analyst

U.S. Dept of Housing & Urban Development, DC Jul 1999 – Feb 2002

Worked with a group of Developers to implement & maintain recent releases of the Real Estate Management System (REMS). REMS serves as HUD’s centralized database for maintaining & tracking Multifamily property information. This Internet-based application allows Multifamily Housing (HUD), the ability to view & correct critical data elements quickly & easily.

Performed coding & testing for data conversion using triggers & stored procedures on Oracle & Sybase. Developed PL/ SQL, SQL scripts to analyze data.

Responsibilities included coding & analyzing ColdFusion pages related to the current releases & resolving Problem Reports (PRs) reported by REMS systems testers & various multifamily users. The work involved in resolving various PRs has included fixing the functionality of the ColdFusion pages associated with the Renewal Subsystem, debugging the results of the page output, & performing unit testing of the subsequent changes. Additionally, using structured query language (SQL/ PLSQL) for database queries, stored procedures & ColdFusion, JavaScript, Java, J2EE & HTML to develop a web-based graphical user interface (GUI),

Programmed both front & back-end functionality for the REMS system. Worked closely with REMS systems analysts & HUD personnel to provide the appropriate Departmental Enforcement Center (DEC) & referral tracking functionality.

Worked primarily as a Programmer on the Financial Assessment Sub System (FASS) & the Management Assessment Sub System (MASS) for the US Department of Housing & Urban Development. FASS & MASS are subsystems of HUD’s Public Housing Assessment System, a System to measure a Public Housing Authority’s performance in an objective & verifiable way.

Managed aspects of COBOL/JCL/DB2 mainframe code writing, testing, troubleshooting, integrating, implementing to AS/400i series, Assured COBOL, DB2 code,reports.

Involved in all phases of system development, including requirements analysis, design, development & testing.

Develop & unit-test software programs for the internet & the intranet using HTML, DHTML, JavaScript, Java, J2EE & Cold Fusion. Test & modify programs during system test.

Relevant experience: Oracle Developer & Database Administrator, DB2, Network & Telecommunications (Novell); Integrated Services Digital Network (ISDN); Java programming, Database management systems; JavaScript scripting; ColdFusion, Java, VB, C, C++, PowerBuilder, COBOL, RPGII, Assembly.

Software & hardware: IBM / Compatibles (Windows, DOS), Tandy 6000 (Unix), VAX 6310 (VMS), WANG, AS/ 400, Sun Solaris, AIX, HP-UNIX, HP, Dell, Sparc, M9000

OTHER STATUS: US citizen, Security Clearance from several Govt agencies, and Active DHS clearance, and Active IRS public trust clearance.

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