Diego Cristóbal Herreros

Diego Cristóbal Herreros

Senior Manager Quality Assurance · IONOS

Passionate about DevOps culture, cloud-native technologies, and quality engineering. I thrive on automating everything possible, leading high-performing teams, and tackling complex problems in fast-paced, ever-changing environments.

Certifications

CNCF

Cloud

IaC

Courses

Experience

IONOS Jan 2026 — Present
Senior Manager Quality Assurance
🇪🇸 Spanish  ·  🇬🇧 English
Stack:
Kubernetes Docker FluxCD Jenkins Playwright TypeScript Ansible AI Agents Subagents
  • Leading technically and managerially a cross-functional QA team focused on billing products
  • Driving process improvement initiatives: test governance, quality gates and release readiness
  • Defining QA architecture, skills roadmap, tooling decisions and long-term testing strategy
  • Building end-to-end and API test automation frameworks with Playwright and TypeScript
  • Managing CI/CD pipelines with Jenkins and GitOps delivery with FluxCD on Kubernetes
  • Introducing AI agents and subagents to boost QA productivity, test generation and coverage analysis
  • Collaborating with engineering, product and platform teams to embed quality across the SDLC
Oracle Jun 2024 — Jan 2026
Senior Site Reliability Engineer
🇪🇸 Spanish  ·  🇬🇧 English
Stack:
Kubernetes Oracle Cloud Spinnaker Grafana Prometheus Alertmanager New Relic OpenTelemetry APM Traefik Jenkins Golang Bash Terraform CDKTF Ansible
  • Ensured availability, reliability and performance of critical services running on Oracle Cloud infrastructure
  • Designed and maintained full observability stack: Prometheus, Alertmanager, Grafana, New Relic and OpenTelemetry/APM
  • Built and managed CD pipelines with Spinnaker and Jenkins across multiple Kubernetes clusters
  • Led incident response, on-call rotations, post-mortem analysis and systemic reliability improvements
  • Managed infrastructure as code with Terraform and CDKTF; configuration management with Ansible
  • Developed internal tooling and automation with Golang and Bash to reduce toil and improve operational efficiency
VMware Jul 2023 — Apr 2024
DevOps Engineer
🇪🇸 Spanish  ·  🇬🇧 English
Stack:
AWS Terraform GitLab CI ArgoCD Kubernetes Logz Kops
  • Designed and maintained CI/CD pipelines with GitLab CI and progressive delivery with ArgoCD
  • Implemented centralized observability and log aggregation with Logz and EFK stack
  • Administered production Kubernetes clusters provisioned with Kops on AWS
  • Managed all cloud infrastructure as code with Terraform
Cloud Native Rioja — CNCF Community Apr 2023 — Present
Organizer
🇪🇸 Spanish  ·  🇬🇧 English
  • Co-organizing cloud-native meetups, talks and workshops in La Rioja as part of the CNCF community
  • Promoting open-source culture, Kubernetes ecosystem adoption and DevOps best practices
  • Connecting local engineers with the broader cloud-native community and industry speakers
Mad Collective Jan 2022 — Jul 2023
DevOps Engineer
🇪🇸 Spanish  ·  🇬🇧 English
Stack:
AWS Terraform FluxCD CircleCI Kubernetes DataDog Golang
  • Built and maintained CI/CD pipelines with CircleCI and implemented GitOps workflows with FluxCD
  • Set up full observability with EFK stack and DataDog for metrics, logs and alerting
  • Administered EKS clusters and managed the full AWS infrastructure with Terraform
  • Developed internal automation tools and scripts with Go and Python
  • Enforced Git as single source of truth across all environments
UST Jul 2021 — Jan 2022
DevOps & Cloud Engineer
🇪🇸 Spanish
Stack:
AWS Azure Terraform Enterprise GitHub Enterprise
  • Automated multi-cloud landing zone deployments using Terraform Enterprise across AWS and Azure
  • Supported and maintained cloud infrastructure for internal teams on AWS and Azure
  • Managed infrastructure repositories and workflows with GitHub Enterprise
Nemergent Solutions SL Apr 2021 — Jul 2021
Systems Engineer
🇪🇸 Spanish
Stack:
Terraform Ansible Prometheus Grafana OpenVPN
  • Provisioned and managed virtual machines for emergency-communications projects deployed worldwide
  • Administered OpenVPN and IPSec VPN servers and resolved complex network issues
  • Set up infrastructure monitoring and alerting with Prometheus and Grafana
  • Automated infrastructure provisioning with Terraform and Ansible
CompuGroup Medical SA Apr 2016 — Apr 2021
Healthcare Consultant Systems
🇪🇸 Spanish
Stack:
Oracle DB JBoss Tomcat VMware Bash
  • Managed VMware virtualisation environment of approximately 120 VMs across multiple hospital systems
  • Administered Oracle databases and resolved critical JBoss/Tomcat application server incidents
  • Monitored full infrastructure and led incident response for healthcare-critical applications
  • Deployed and maintained clinical software across hospitals and health centres in Spain

Education

2022 – 2023
Master's degree in Big Data & Advanced Analytics Universidad Alfonso X el Sabio
2019 – 2022
Degree in Computer Engineering Universidad Isabel I
2017 – 2019
Higher Vocational Training — Web Application Development ILERNA FP Online
2013 – 2015
Higher Vocational Training — Network Systems Administration IES Comercio
2009 – 2011
Intermediate Vocational Training — Microcomputer Systems and Networks IES Duques de Nájera