Summary
Overview
Work History
Education
Skills
Additional Information
Certification
Timeline
Generic

David Gresham

Plymouth,Minnesota

Summary

Self-motivated Information Technology Professional providing Architectural, Engineering, and Operational support to Enterprise solutions. These environments have been comprised of a wide variety of platforms, hardware and architectural designs. Continuously learning new technologies and developing innovative solutions for multiple environments. My ongoing interest is with emerging technologies, architectural design, and furthering automation capabilities within scalable environments.

Overview

19
19
years of professional experience
1
1
Certification

Work History

Principal Systems Management Analyst

Optum
Eden Prairie, Minnesota
08.2024 - Current
  • Automated manual processes using GitHub Actions and Python for Azure Service Principal Secret rotation and network packet captures from Azure Kubernetes.
  • Deployed Dynatrace Operator via GitHub Action into Kubernetes environments.
  • Implemented Dynatrace injection from Kong API Gateway utilizing NGINX/OpenResty.
  • Upgraded RHEL8 Postgres environments to RHEL9 for enhanced performance.
  • Built and deployed three-node Postgres clusters using RepMgr.
  • Provided on-call support for Kong API Gateway to resolve critical issues.
  • Managed incident and change controls through ServiceNow for operational efficacy.
  • Conducted Office Hours call for Kong API Gateway to facilitate knowledge sharing.

Lead Software Engineer

Optum
Eden Prairie, MN
08.2018 - Current
  • Deployed and upgraded Kong API Gateway using Terraform and automated GitHub Actions for Azure AKS and AWS EKS.
  • Conducted performance testing on AWS Kubernetes Service to assess gateway latencies across regions.
  • Implemented Telegraf, InfluxDB, and Grafana for real-time API performance monitoring.
  • Developed and deployed Python and Java applications to maintain operational integrity during releases.
  • Introduced automation tools to enhance workflow efficiency and eliminate redundancy.
  • Supported Cassandra databases and migrated data to Postgres for improved performance.
  • Provided technical guidance and mentorship to junior developers, fostering skill development.
  • Troubleshot complex production issues, ensuring high system reliability.

Program Manager

Optum
Eden Prairie, MN
02.2017 - 08.2018
  • Managed cross-functional team effort to establish Kubernetes on Baremetal hardware as part of Optum's Open Source Flexible Infrastructure effort. Worked with Compute, Network, Security and Storage teams to deploy capacity within 3 Major Datacenters
  • Managed Proof of Concept effort for a Low Cost Clustered Filesystem solution with Foundational Engineering and Enterprise Storage teams to evaluate GlusterFS as a solution. Helped draft requirements that products had to meet in order to be leveraged as a enterprise solution as part of the Open Source Flexible Infrastructure initiative
  • Managed initiative to leverage OpenCompute certified commodity hardware from Quanta to lower cost of current HP DL380 hardware platform. Effort included leveraging tools such as Foreman and RedFish API to automate build processes, which then were finished by Chef Recipes. Solution was used for Mesosphere and Big Data (Hadoop/MapR) Clusters

IT Manager, Architecture

Optum
Eden Prairie, MN
02.2010 - 02.2017
Optum's
  • Helped Architect and design the implementation of Chef for Configuration Management for early adopters
  • Lead Team with up to 12 Infrastructure Architects that provide solutions for UHG/Optum Business units mission critical applications
  • Worked in a cross functional team effort to estOpium'sOptum's Enterprise Service Catalog that allowed self-service provisioning of IaaS and PaaS based solutions such as Windows Server, RedHat Linux, middleware such as Websphere, JBOSS; database services such as SQL Server, MySQL, and Oracle. Team was tasked with working with service provider teams to ensure non-functional items were included in the offering, such as High Availability and Disaster Recovery
  • Piloted a continuous development program that had my team investigate and learn the basics of a technology area and then present a one hour presentation to the team of their learning journey

Senior Infrastructure Architect

Optum
Eden Prairie, MN
01.2007 - 02.2010
  • As Part of several M&A efforts, worked with cross-functional teams to migrate applications from acquisition entities data centers to Optum Based Facilities
  • Analyzed Application requirements with key stakeholders, reviewed Conceptual Context Diagrams to show key functionality within application to determine needed Infrastructure to successfully deploy the application throughout SDLC
  • Services ranged from provisioning web servers, middleware servers, database servers, creating appropriate f5 load balancer configurations (both LTM and GTM). Reviewed Firewall rules that needed to be setup. Worked with Security Team for review to ensure proper security configurations were in place
  • Right sizing of infrastructure, such as in PLM efforts the application was running on physical hardware. Reviewed Performance Data to recommend virtualization of services
  • Lead Team effort of Infrastructure Architects to migrate several hundred servers from a West Coast Datacenter to Minnesota without moving any physical hardware. Servers were migrated via network based connections to either new virtual machines or physical servers as required to meet business application performance requirements

Senior Infrastructure Architect Consultant

Tech-Pro Inc.
Roseville, MN
07.2006 - 01.2007
OpenComputeGlusterFSBaremetal
  • Contracted to Optum Technology to help migrate approximately 800 Servers from a recent M&A's infrastructure in IBM's Global Services facility in ST. Louis to Minnesota based Data-center for six months
  • Groups of Servers were placed into Migration Groups with specific dates set for cut-over. Part of On-Call support team for the migration cut-over and helped on-call support teams (Hosting, Storage, Network) in case of any questions pertaining to the build documentation
  • Worked with application support teams, where available, to help provision necessary rack-space within Optum's Corporate Data-center. Built System Logical Diagrams showing end-to-end connectivity
  • Reverse Engineered application infrastructure when application support team had left the company. Reviewed system configurations to identify what services were running, what they connected to, and on what ports so that any needed firewall rules could be established

Education

Bachelor of Science - Information Technology

Capella University
Minneapolis, MN
2018

Skills

  • Cloud Architectures: AWS, Azure, and Google Cloud
  • Docker, Kubernetes, and Openshift
  • Kong Enterprise/Open Source API Gateway
  • API Gateways, OAuth2, JWT and OIDC authorization patterns
  • CoPilot
  • Python, Java, Bash
  • Ansible, Terraform
  • Service Now
  • Operating systems - Windows Server, RHEL, and Ubuntu
  • Database Management: MySQL, Postgres, SQL Server
  • Network: TCP/IP, OSI, DNS, DHCP, IPV4, F5 LTM/GTM Load Balancers Creating appropriate firewall rules
  • Storage: NAS, SAN, and Object Storage
  • Virtualization: VMWare ESXi
  • Microsoft Office tools, including Visio
  • Soft skills: assuming positive intent, active listening, conflict management, and continuous improvement (learning new skills)
  • DevOps Tools: Git/Github, understanding of CI/CD Pipelines(Jenkins) and Github Actions

Additional Information

Recent Udemy classes completed:

  • The Ultimate AWS Certified Solutions Architect - Associate
  • Ultimate AWS Certified Developer Associate 2019
  • Docker and Kubernetes: The Complete Guide
  • Part 1 Foundation Enterprise Architect Training Certification
  • Part 2 Certified Enterprise Architect Training
  • Jenkins, From Zero to Hero: Become a DevOps Jenkins Master
  • Microsoft Azure: From Zero to Hero - The complete guide.
  • Apache Maven: Beginner to Guru
  • Master Microservices with Spring Boot and Spring Cloud

Certification

AWS Certified Solutions Architect.

AWS Certified Developer Associate.

Azure AZ-104 Administrator Associate

TOGAF 9

Comptia A+/Network+

Checkpoint Certified System Expert

CCNA (2002)

CISSP

Timeline

Principal Systems Management Analyst

Optum
08.2024 - Current

Lead Software Engineer

Optum
08.2018 - Current

Program Manager

Optum
02.2017 - 08.2018

IT Manager, Architecture

Optum
02.2010 - 02.2017

Senior Infrastructure Architect

Optum
01.2007 - 02.2010

Senior Infrastructure Architect Consultant

Tech-Pro Inc.
07.2006 - 01.2007

Bachelor of Science - Information Technology

Capella University

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