Mark Holcomb Email & Phone Number

Concord, CA, US

Houston, Texas, US

• Led the orchestration and upkeep of end-to-end infrastructure at Engi. Spearheaded the implementation and management of Infrastructure as Code (IaC) using Terraform, seamlessly integrating with our technology stack to.
• Maintain cryptocurrency nodes and exchange using substrate.
• Championed the automation of testing and deployments through robust CI/CD pipelines, leveraging CircleCI and AWS CodePipeline.
• Architected robust multi-region infrastructure for all services, predominantly on AWS, encompassing technologies like ECS, ECR, ELB, and SSO.
• Engineered and sustained monitoring solutions, harnessing the power of CloudWatch, Prometheus, and Better Uptime to ensure optimal system performance.
• Leveraged Redis and NoSQL databases, with a focus on RavenDB.

Chicago, Illinois, US

• Develop and maintain AWS EKS K8 deployments.
• Contributed code (Python / Golang) for various microservices that run the Grubhub delivery service. These services run in the Amazon Web Services (AWS) ecosystem.
• IaC (Infrastructure as code) using Pulumi.
• Maintain metrics infrastructure leveraging Datalog with internal microservices.
• Code reviews and collaborative development using Github.

San Francisco, California, US

• Contributed code (Terraform / Golang) to microservices for the Salesforce Public Cloud Service (Falcon). This heavily leverages Amazon Web Services (AWS) ecosystems.
• Improved automation of our CI/CD pipeline using tools such as Chef and Salt (Python and Ruby).
• Key role in driving quality software by developing coding standards, unit and integration testing, and continuous-integration.
• Participated in code reviews and guiding junior members of our team.
• Contributed to monitoring and analytics leveraging Splunk, Grafana, and internal tools.

New York, NY, US

• Developed many home grown scripts in Python and Ruby for integration with automation of various infrastructure technologies. Examples include: script for maintaining iDRAC firmware and configuring BIOS and LC.
• Wrote many dozens of Chef recipes to automate provisioning of Infrastructure and service applications. Examples include: Gap’s Ecom server stack, Openstack node configuration, and base infrastructure roles for 95% of.
• Worked heavily with our source control driven automation systems using Git, Chef, Electric Commander, and Jenkins/Hudson. “OTIS” style deployment strategy was used.
• Implemented mid-sized Petabyte Hadoop Big Data cluster for our analytics team. Cluster was provisioned and managed with internally written Chef recipes.
• Implemented Splunk logging cluster from scratch. Configurated thousands of input sources and sorted log types and field extractions. (also Chef maintained)
• Experience in an agile work environment. Projects and documentation were managed with Jira and Confluence.

Atlanta, Georgia, US

• Worked in a development operations environment as a systems engineer.
• Worked primarily on developing and managing a new content management system written in
• Python/Django that serviced integrated content between Cox properties. (newspapers, TV and radio stations)
• Our group was the top tier of technical expertise in the company. Our data center was primarily a large enterprise Linux based environment running CentOS.

Basking Ridge, NJ, US

• Worked with Verizon to port their Ponshop web application for troubleshooting and tracking CLEC issues; from Solaris 5.8 to a SLES 10 Linux platform.
• Porting included code written in Pro C, Perl, Ksh, and Java.
• Project entailed a complete migration from scratch with minor rewrites to software, scripts, batch jobs, and configurations.
• Consulting Verizon on several Linux specific architectural issues including kernel configuration, SSO porting, and hardening recommendations for configurations.

Miami, FL, US

• Work in IT Operations writing Perl and shell scripts as well as come C programs to automate functionality and new installations or roll outs.
• Play a large role in securing Tracfone’s network and implementing PCI security standards, including writing security hardening scripts written as a single script to run on AIX, HP-UX, Solaris, SLES (SUSE Linux.
• Automation including PXE/Kickstart RedHat installations and post install scripts to automate installation of Avaya PBX and weblogic software and configuration.
• Generating monitoring graphs using Perl, RRDTOOL, and PHP for graphing various reports.
• Writing custom Nagios modules, and C programs to quickly search and parse out large log files for debug or customer information.

Bentonville, Arkansas, US

• Key senior member of a team of developers who work one on one with a group from Wal-Mart's pharmacy data division to port Wal-Mart’s global pharmacy network from IBM hardware using AIX to Dell hardware using SLES (SUSE.
• Porting hundreds of various software packages written in C, C++, Perl, and KSH scripts, historically designed to work exclusively for the IBM AIX operating system to run on SLES (while maintaining their compatibility.
• Contributed code/scripts will be used to control every pharmacy transaction and query at over eighteen thousand stores across the United States and Canada.
• Significant contributor to Wal-Mart's pilot Linux porting project, a precursor to a much larger porting project to convert their entire global network to run on SLES/SLED.
• Provide technical support for Wal-Mart’s network/systems administration team at their primary datacenter comprising around 1,200 servers to resolve problems beyond their skill-set or technical resources.

• Managed network infrastructure for a financial services firm.
• Responsible for maintaining a network of CentOS, Fedora Core, and Windows Server 2003 systems running web, mail, database, and central file servers for interoffice and client communications.
• Developed Asterisk IP telephony and call-center solutions for office and client use.
• Virtualized a number of individual IVR trees on a single Asterisk PBX server to establish dedicated call handling for the company’s subsidiaries and clients.

• Designed a custom mailing list manager for the dissemination of press releases via the company’s membership database as well as their clients’ stockholder lists.
• Using the C programming language I designed, created, and implemented a multi-threaded web crawler application over a large multi-node international network. The purpose of the application was to collect data and form.
• The application also comprised a custom web-based configuration and network monitoring tool and a content management system that allows custom database queries and constructs a website from data stored within a MySQL.
• Maintained and administered an international multi-site network of 80 Redhat Linux and BSD servers running web services, mail services, FTP services, and the web crawler under high network load.

• Network architect and administrator for a tier 2 B2B Internet service provider under a three year consulting contract from March 2003 to April 2006 on a round the clock basis.
• Designed and maintained a highly automated high security datacenter network with multiple, redundant tier 1 peers and numerous client private fiber loops.
• Interfaced with a large number of clients on a daily basis to assist them in the deployment, management, and troubleshooting of their fiber loops, servers, applications, and data.
• Created a range of scripts both internal and external to the network to alert network administrators via email and SMS (text) messages as to system or network status changes.
• Responsible for traffic/BGP routing, network monitoring, network security, troubleshooting network issues, administration of client servers/clusters, automated data backup and retrieval, and application deployment and.

• E-commerce web development with an integrated billing/shipping management interface and an interactive user front-end.
• Created a C application that created a 3 dimensional image of custom designed products that was then used to display the product’s likeness to the customer based on information fed into the application by them on the.
• The primary function of the application was to act as a custom order product designer and cost calculator that provided an actual price to the customer based on real-time raw materials and labor cost.
• The application also extrapolated and graphically depicted the most efficient usage of the raw materials at hand for the customer’s design parameters and made material choices by taking into account the actual raw.

• Architected and built an end-user DSL Internet service provider network for a small Competitive Local Exchange Carrier (CLEC).
• Primary contributor to the design and deployment of the network from scratch.
• Developed many custom tools to automate the processes of user account creation, user database management, billing (including tools for the determination and improvement of the Average-Revenue-Per-Subscriber (ARPU)).
• Responsible for general network administration such as traffic routing and network security.

Huntsville, Alabama, US

• Worked directly under the creator of the Linux based PBX system known as Asterisk [Mark Spencer].
• Tasks included software development related projects (mostly in the C programming language) including; development contributions and maintenance of the Asterisk PBX opensource project.
• Provided onsite and telephone support to customers/clients for Linux and Asterisk administration related issues.
• Other notable projects include an independent autonomous client for voice communications being tunneled over UDP based protocols and using Glade to develop a GUI for same, Linux drivers and driver control interfaces.