Jimmy Mayfield

Staff Software Development Engineer - RubiconMD (Remote)

2024 - Present

• Lead architecture decisions across platform and product engineering to improve reliability, scalability, and long-term maintainability.
• Partner with security and compliance stakeholders to align engineering delivery practices with healthcare and regulatory requirements.
• Own multi-cloud infrastructure operations across AWS and Azure, including provisioning, scaling, monitoring, backups, and lifecycle upgrades for production services.
• Modernize CI/CD workflows and quality gates to improve release safety, engineering velocity, and security posture.
• Improve infrastructure-as-code standards by upgrading Terraform and refining reusable modules for faster, safer environment delivery.
• Led a platform modernization initiative by migrating from end-of-life Ansible Tower to AWX and redesigning cloud tenancy boundaries across AWS and Azure by splitting environments into separate accounts and subscriptions (for example, PHI vs non-PHI) to strengthen isolation and governance.
• Create and maintain architecture diagrams, runbooks, and operational documentation to improve onboarding and cross-team execution.

Systems Architect - Idea Evolver (Remote)

Aug 2023 - 2024

• Partnered with compliance and development teams to ensure architecture decisions aligned with FDA digital health regulations.
• Owned security, provisioning, scaling, monitoring, backups, and patching for Google Cloud projects, GKE clusters, and Cloud SQL.
• Maintained system architecture diagrams, software design documentation, runbooks, and internal technical how-to guides.
• Upgraded and hardened CI/CD pipelines to improve delivery efficiency, cost control, and application security.
• Designed the next-generation Idea Evolver platform-as-a-service using Google Cloud technologies.
• Upgraded microservices from unsupported Node.js and Go versions to current LTS releases, reducing vulnerabilities and technical risk.
• Upgraded Terraform and rewrote modules to streamline creation of new Google Cloud resources.
• Migrated container images from deprecated Container Registry to Artifact Registry.
• Integrated QA smoke/integration testing, Veracode scans, and SBOM generation into GitHub Workflows and Google Cloud Build pipelines.

Site Reliability Engineer - Mailgun, San Antonio, TX

Feb 2020 - Aug 2023

• Worked fully remote with an international engineering team and participated in production on-call rotation.
• Built automation to migrate Mailgun resources from AWS to GCP using Ansible and Terraform.
• Provisioned, scaled, and administered large distributed data platforms including Cassandra, Kafka, Redis, Postgres, and MongoDB.
• Developed and maintained cloud build automation tooling for AWS and GCP with Python, Go, Ansible, and Terraform.
• Provisioned and supported CI/CD pipelines across application development, staging, and production environments.
• Organized and led migration of marketing domains into a unified codebase using Gatsby and Netlify.
• Developed the MVP with a small team for Mailgun's Pathwire brand launch, including CI/CD pipeline work and delivery of signup.pathwire.com and the www.pathwire.com marketing site.
• Integrated services and networking between Mailjet and Mailgun Google Cloud environments.
• Worked directly with compliance stakeholders to ensure architecture and implementation decisions met requirements.

Site Reliability Engineer - Rackspace, San Antonio, TX

Jul 2019 - Feb 2020

• Architected, deployed, and operated a large-scale, multi-region Cloud Databases platform on OpenStack across six global regions (DFW, ORD, IAD, LON, SYD, and HKG).
• Received the OpenStack Public Cloud 1.21 Gig-Award (Q2 2019) for upgrading Sydney and Hong Kong control planes from end-of-life v1 to supported LTS v3.
• Aligned Cloud Databases software across regions, resolving compatibility issues with Identity, Cloud DNS, and LDAP services.
• Built and operated end-to-end, multi-stage CI/CD pipelines for regional Cloud Databases releases on a multi-region OpenStack platform, covering provisioning, configuration management, artifact build and publish, database-backed automation, and production rollout coordination using open source tools.
• Wrote and maintained internal and external documentation for Rackspace Cloud Databases and Cloud Servers.
• Partnered with product and development teams to ship control panel enhancements, database integrations, and new features on aggressive timelines.

Linux Systems Engineer - Rackspace, San Antonio, TX

Jan 2014 - Jul 2019

• Contributed to Rackspace achieving AWS Platinum partner tier by earning key certifications, including AWS Certified Developer and AWS Certified Solutions Architect.
• Participated in engineering on-call rotation and incident response.
• Planned and developed custom cloud architectures for small and large-scale customers across Amazon and Rackspace services.
• Troubleshot hardware, network, and application issues across development, staging, and production environments.
• Developed and maintained automation for provisioning and operating customer environments at scale.

Cloud Operations Engineer (3) - Rackspace, San Antonio, TX

Jan 2012 - Jan 2014

• Participated in on-call operations rotation supporting production cloud systems.
• Collaborated with software development teams to improve feature stability and align technical delivery with business requirements.
• Mentored teammates through break-fix incident handling, brown-bag sessions, and one-on-one coaching.

Sr. DevOps Engineer - Mixbook, San Antonio, TX

Jul 2011 - Dec 2012

• Led migration from Engine Yard to dedicated infrastructure hosted at 8x8.
• Partnered with product and development teams to build CI/CD pipelines for releases into new data centers.
• Developed automation to bootstrap new production and staging environments on dedicated hardware.
• Planned and executed a large-scale customer data migration with minimal service disruption.
• Developed Chef-based automation to provision and manage RabbitMQ, OpenStack Swift, GlusterFS, MySQL, ELK, NGINX, and Cisco ASA environments.
• Trained and mentored developers on Git workflow best practices and practical Docker adoption across local and CI development environments.

Cloud Operations Engineer (2) - Rackspace, San Antonio, TX

May 2009 - Jul 2011

• Provided front-line support for managed customers focused on LAMP stack environments.
• Deployed and managed hypervisor hosts and cloud control plane infrastructure to scale Rackspace Cloud and Slicehost during periods of rapid customer growth.
• Handled escalations from Rackspace Cloud and Slicehost support teams.
• Diagnosed and resolved hardware, network, and application issues in production and staging environments.
• Ran proactive monitoring and alerting across managed customer environments and core Rackspace cloud infrastructure to identify issues before customer impact.
• Partnered with solution engineers to recommend operational best practices and performance improvements for managed customer environments.
• Served as the primary technical liaison for high-profile managed customers, owning complex escalations and cross-team coordination for demanding workloads.

Sam Houston State University, Huntsville, TX

Associate of Applied Science in Computer Science | 2004 - 2006

University of Arkansas, Fayetteville, AR

Computer Science | 2001 - 2003