Systems & Cloud Engineer
Daniel Sierra Caramés
Linux, Kubernetes and multi-cloud infrastructure for production payment systems.
About
IT professional with 3+ years of experience administering Linux systems and infrastructure, managing cloud environments (GCP and OCI), and operating production Kubernetes clusters. Solid track record in financial and payments-sector projects, with responsibilities spanning proactive monitoring, deployments, incident resolution, and 24/7 on-call support. A year of international experience in Vancouver, Canada gave me strong technical English and a customer-oriented mindset. Resourceful, autonomous, a fast learner, and focused on continuous improvement and operational efficiency.
Experience
Work Experience
Mar 2025 – Present
System Engineer
Nuek – Minsait Payments UST · Madrid
- Administer and operate Linux systems in critical production environments across 15+ cloud projects.
- Manage 9 Kubernetes clusters — 6 on GKE and 3 on OKE — covering development, pre-production and production environments, plus internal clusters running CI/CD pipelines, deployments and image builds.
- Operate GCP and OCI cloud infrastructure: deployments, resource and architecture configuration, incident resolution.
- Administer 10 Oracle Data Integrator VMs: 7 used for migration work and 3 running the development, pre-production and production ETL platform for a major banking client, which processes hundreds of files and gigabytes per day.
- Apply data model and data changes in Oracle and PostgreSQL databases during deployments and maintenance windows.
- Proactive monitoring across Datadog, OCI Monitoring and GCP Logging: build and tune dashboards and 500+ alerts covering the platform, catching and mitigating issues before they reach production.
- Provide advanced technical support to development teams, ensuring operational continuity and collaborating on application- and infrastructure-level issues.
- 24/7 on-call for Getnet's cloud infrastructure on a two-person rotation of alternating weeks: around 10 alert notifications a week and an out-of-hours callout roughly every two weeks.
Mar 2024 – Mar 2025
Junior System Engineer
Minsait Payments UST · Madrid
- Level 2 technical support within Minsait Payments' Technology Support Unit for the Getnet project.
- Administered and maintained GCP and OCI cloud environments: instances, networking, storage, and permissions.
- Resolved incidents across development, pre-production, and production environments, documenting root cause and corrective actions.
- 24/7 on-call support for production environments, handling incidents outside business hours.
- Collaborated with development and operations teams on continuous process improvement.
Jan 2023 – Jul 2023
Helpdesk / IT Support
Real Canadian Superstore · Vancouver, BC, Canada
- Level 1 support for the public and internal staff at a high-volume hypermarket in Canada.
- Resolved basic hardware and software issues.
- Developed customer service and technical communication skills in English in an international environment.
Mar 2022 – Sep 2022
Systems Administrator
Hopla! Software · Madrid
- Administered Kubernetes and OpenShift clusters at a cloud-sector startup.
- Supported and operated Telefónica Tech's Cloud Garden project (now TROS), a multicloud management platform.
- Handled deployment, monitoring, and incident resolution on the OpenShift platform.
Oct 2019 – May 2020
Workstation Imaging Technician
INFOREIN S.A. · Madrid
- Created and installed images on hundreds of workstations daily for Spain's Social Security IT Management (GISS), later for the Ministry of Health.
- Configured, deployed, and verified equipment per client-defined procedures and deadlines.
- First professional experience in large-scale corporate IT environments.
Education
2020 – 2022
Higher Vocational Diploma in Network Systems Administration (ASIR)
IFP Julián Camarillo · Madrid
Skills
Operating Systems
- Linux (RHEL, CentOS, Oracle Linux)
- Advanced Unix administration
Cloud
- Google Cloud Platform (GCP)
- Oracle Cloud Infrastructure (OCI)
Containers & Orchestration
- Kubernetes
- GKE
- OKE
- OpenShift
Monitoring & Observability
- Datadog
- OCI Monitoring
- GCP Logging
- ELK
- OpenTelemetry
Databases
- Oracle DB
- PostgreSQL
- Oracle Data Integrator (ODI)
Scripting & Automation
- Bash
- Python
Networking
- TCP/IP
- DNS
- Firewalls
- Connectivity troubleshooting
Operations
- 24/7 on-call
- Critical incident response
- Service recovery
Projects
This Site
LiveBuilt to be its own evidence. Terraform provisions every Oracle Cloud resource; cloud-init turns two bare Arm nodes into a Kubernetes cluster that forms itself; the Next.js application ships onto it as a container image. The guestbook writes to Oracle Autonomous Database and the contact form to PostgreSQL, two databases chosen for the different shapes of question they answer. OpenTelemetry reports what all of it is doing, and the Monitoring page reads those numbers live.
- Next.js
- TypeScript
- Terraform
- Kubernetes
- OCI
- PostgreSQL
- OpenTelemetry