Alexander Dewolf Email & Phone Number

Linux specialist for Linux Server Administration tasks. Senior

Chicago, Illinois, United States

Chicago, Illinois, United States

✅ Architecting, installing, updating and maintaining multiple Linux servers leveraging Red Hat Enterprise Linux, ensuring seamless integration across development, staging, production, and DR landscapes, while relentlessly pursuing excellence in troubleshooting and Quality Assurance. ✅Managed and optimized RHEL 7, 8, and 9 servers, ensuring stability, security, and performance, reducing development to production by 25%. ✅Spearheaded the documentation management system updates to comply with the annual audit process, preventing potential lawsuits and fines. ✅Led automation strategies with Jenkins to enhance production stability, streamlining embedded system deployments of flawless code with minimal disruptions.✅Collaborated with 10+ SysOps and IT teams to assist in resolving production issues, ensuring a cohesive approach to infrastructure management. ✅Assisted the Quality Assurance team with technical issues for testing. Creating and maintaining systems and procedures documentation for internal use only resulting in reducing the on-call incidents by 30%. ✅Maintaining, updating and configuring performance monitoring systems using NAGIOS and Zabbix tools reducing downtime by 15% and improving system performance by 20%.

Chicago, Illinois, United States

✅Proactively monitored and addressed system alerts across in-house and client cloud infrastructures, ensuring uninterrupted performance spanning OpenStack and Kubernetes implementations on Ubuntu 18 and 20.✅Led comprehensive Linux-based projects, specializing in OS configurations, UEFI storage management, and establishing a resilient software RAID 1 framework.✅Leveraged advanced Bash and Python scripting capabilities to devise practical solutions, enhancing the efficiency of daily operations.✅Developed and supervised a suite of automation scripts, dramatically minimizing manual interventions and boosting overall operational speed.✅Achieved swift incident mitigation by pinpointing and rectifying potential system anomalies, guaranteeing consistent system functionality and service continuity.✅Orchestrated the smooth transition of KVM virtual machines from interim to long-term storage setups, fortifying data consistency and system resilience.✅Exemplified proficiency in Bash and Python scripting to refine operational procedures and elevate system throughput.

United States

Worked on building an hardened Ubuntu 18 and 20 images for embedded systems.

San Diego, California

Systems engineer for Linux based systems and applications.

Greater San Diego Area

Daily Linux maintenance of 3000 servers. 2500 virtual servers (VMware) and 500 bare metals (IBM and HP X86). RHEL 3,4,5,6,7 and SuSE 10,11. EMC SAN and NAS storage. Tivoli ITM, and TSM . BigFix, Puppet and Chef system management tools. Oracle RAC and ASM. Assist development and tier 4 (Engineering) efforts. Bash and Perl scripting. Work done on Kaiser-Permanent account for IBM.

San Diego, California

Daily Linux Administration of dev/UAT/prod environments. CentOS 5 and 6, Ubuntu Linux. Cacti monitoring and AD integration. ESXI VM hosting of Linux dev/testing environments. Amazon Cloud servers and Rackspace hosted services management for production servers.

Home Office (San Diego, Ca)

Linux Administrator sub-contractor for IBM supporting Kaiser-Permanente.Daily maintenance of RHEL (5.4,5.5 and 6.0) and SLES VMs (Vcenter) and (IBM Blade X-server and HP blade servers) baremetal servers. Environment:RHELSLESEMC Symmetrix SANOracle RAC ASM storageJDKWSMQ seriestivoli endpoint and backupECC Symmetrix monitoring

Linux and Mac OSX administration duties. RedHat 4 running on cloud based services.

Move of C6 colocation facility; Validation of Network connections and SAN WWNsValidation of shutdown and startup proceduresUpdated Quick Base information for servers moved to QunicyUpdated Avocent KVM with hostnames and hardware typeGathering of Windows Event logs and Linux dmesg logs for HP's re-validation of hardware after moveEnvironment:Sun: OS: Solaris 10,9,8 H/W: Sun V210, V240, V480, V880, T2000, Blade 60000, Fire 4800, Fire 280, Enterprise 250HP: OS: HP-UX 11.31 Redhat Linux 3,4,5 Windows 2000,2003,2008 H/W: HP DL360, DL380, DL585, DL385, DL560, 9000 RP8420Dell: OS: Redhat 3,4,5 Windows 2000,2003 H/W: Poweredge 1950, Poweredge 2950, Poweredge 2850, Poweredge M1000eStorage: Avocent DSR 8035, EMC DMX 3000, EMC DMX 4500

Linux/Unix administration as a contractorResponsibilities: Solaris 10 (SunOS 5.10) installation, maintenance on Sun Ultra 45 hardware Cleaned up missing and incorrect Inventory data in Sharepoint database Hardware moves (Lenovo/Sun/Apple) Decommissioning hardware Linux installation on Lenovo/IBM and Apple hardware, including high availability/performance LSF clustering. Apple OSX installation (MacPro and Xserve blade servers) Resolution of unresponsive Linux/Unix servers Updated Bash and Perl scripts for inventory maintenance Installation of 10 node Linux cluster on Apple MacPro and Xserve hardware Maintenance of 2 40 node IBM blade servers Installation of blade servers (IBM and Sun) Maintenance of in-house developed Linux monitoring system Pfizer Inventory ICM technician for the group Maintenance, installation of Linux and Windows (Xp, 2000 and server 2003) vmware clients on Linux servers Installation/configuration of RedHat and CentOS clients on VMwareESX hosts. Host environments include Linux and stand-aloneInstallation/configuration/maintenance of Apache and Tomcat services on Linux.Environment: RedHat Linux (4, 5.2 and 5.3), CentOS Linux (4.7, 5.2 , 5.3 and 5.4), Solaris 10 (SunOS 5.10), Lenovo D10/D20 servers, Apple MacPro and Xserve, Apple Leopard (10.5) and Snow Leopard (10.6), Bash scripting, Perl scripting, in-house developed Linux monitoring system, Palm Pilot barcode scanner, ICM inventory system, Sharepoint, Windows 2000, Vmware ESX, LSF Linux clustering (load sharing and availability), Sun Ultra 45 (Ultra Sparc-IIIi cpu

RedHat Linux administration/Perl programmer/MySQL administration; Cleaned up bad data in MySql databaseCorrected non-working SQL generated from Perl scriptsDesigned and implemented project to move Perl scripts to PHPEnvironment: RedHat Linux, MySql, Perl, Bash, PHP

Day to day administration of 2 HP RP3440 UNIX servers running IFAS financial application with EMC CX-300 RAID. HP-UX 11.11, Informix 9.40 HC3, KSH scripting, SQL scripting, EMC PowerPath 5.1.0 and Navisphere .Also administrated Sun 5.0 on a Sun-blade 1500, running Hummingbird hclnfsd, and GIS LMF.

Monitored EDI application and OS logs for proper application execution Shell (KSH and SH) scripting for re-processing EDI data File restores for reprocessing and EST re-submitting QA testing.Assisted with development efforts ("C", KSH or SH scripting) 24/7 support.. Monitored file system usage and assisted with QA/UAT system management.Environment: Compaq Alpha 8400, 2 node cluster, EMC storage, Tru64 4.0e and 5.1, In-house EDI application, KSH scripting

Maintain and update ICM (Merchandising) system used to manage a large warehouse for order fulfillment/replenishment of warehouse items and printing of product bar codes and retail prices. Ran weekly update script (Sunday nights 1:00PM- 5:00AM) Environment: HP K and N servers, HP-UX 10.20 and 11.00, ICM merchandising system, KSH scripting

The main data center for the company at the time with 100 UNIX servers in our data center.Responsibilities:Maintenance, installation, procurement, specification and configuration of UNIX servers for Provisioning of GSM phones, billing data (CDR, Call Detail Records) collection and printing of monthly cell phone bills.Maintenance of an X.25 network for connectivity to cellular switches for phone provisioning and CDR collection Nightly backups of all UNIX servers using Veritas Netbackup Assisted Oracle DBAs with performance tuning in production environment and installation Assisted development and data-warehousing groups with procurement, specification and maintenance of HP and DEC hardware/OS/RAID. Responsible for troubleshooting of OS/hardware/Network issues Environment: DEC Alpha 4100, 4000, DS-20, 100A, DEC True Cluster, HP K,N, Superdome, EMC 8000 RAID, DEC Storage Works RAID 230, 250, 10000, with HS-Z40, HS-Z50, HSZ-80 RAID controllers, DEC X.25 network adapters, DEC UNIX 3.2G, 4.0E and 5.1 with Tru Cluster, HP-UX 9.0, 10.0, 11.0, Veritas Netbackup, KSH scripting, SQL scripting, Pearl

Sys admin for a development team writing middleware software for GTE's land-line based phone usage billing After a security breaking I built a private network of 6 HP workstations and one HP server for the developers to check their code, I also built an NIS environment so that the developers could log into different servers and have a common development environment. I also worked for a group distributing production code using Tivoli.Environment: HP G, H,I, T500, K UNIX servers, HP-UX, C Compilers, Middleware for land based billing system, Tivoli