~10,000 registrations / year
Rebuilt a manual registration site as a self-service platform.
Database, admin UI, automated reports, RabbitMQ workers, CI/CD and deployment. Scale is my estimate.
Denis Urek · Radovljica, Slovenia
Platform / DevOps Engineer
I build and operate applications, delivery pipelines and infrastructure automation end to end. I also write the hands-on training labs that teach the same systems.
- Current
- DevOps / Software Engineer
Flint SI · since Jan 2023 - Credential
- Achieved Kubestronaut
Linux Foundation · Sep 2024 - Availability
- Open to roles
Platform · DevOps · AI-adjacent - Contact
- [email protected]
Email is the fastest route
Evidence at a glance
~10,000 spreadsheet lines
Removed hand translation from network configuration work.
A web-accessible automation maps server and switch data from Excel to JSON and sends it to a master-configuration app.
~25–30 labs authored
Built the systems and wrote the training that teaches them.
Hands-on material across OpenShift AI, Kubernetes networking, Linux hardening and agentic AI. Count is my estimate.
~5 daysto~1 for one task
Made a recurring delivery workflow faster and more consistent.
AI-assisted workflow built against a golden example. This is my estimate for that task, not a company-wide metric.
Career history
Experience
Outcomes lead; role, employer, place and dates remain directly underneath for verification.
Jan 2024
– Present
Turned a hand-edited registration site into a self-service, queue-backed platform.
I own internal and customer-facing systems from application code through delivery and ongoing operations, and contribute hands-on certification-training content as a subject-matter expert.
- ~10,000 registrations a year now run through the platform I rebuilt. Static JSON became a database-backed application with staff self-service, four automated report types per event, and an estimated several hours of admin work removed each week. Both figures are my estimates.
- Made failed sign-ups, emails and calendar invites recoverable. RabbitMQ workers return failed jobs to the queue for logging and retry instead of losing them.
- Removed manual translation from ~10,000-line configuration workbooks. Built a web-accessible Excel-to-JSON automation for server and switch data, using Claude Code heavily because of the data volume.
- Made repeatable delivery the default path. GitLab CI/CD builds and deploys containers to security-hardened Linux VMs; Ansible or Terraform is chosen per stack, and Grafana covers the production VMs I own.
- Authored ~25–30 hands-on labs and cut one recurring task from roughly five days to one. The lab count and time saving are my estimates. I also administer Claude Code for the organisation, advise colleagues on adoption, and proctored the CTF at Cisco Live Amsterdam 2025.
Jan 2023
– Dec 2023
Established repeatable CI/CD and infrastructure-as-code practices for internal services.
The first year at Flint moved quickly from onboarding into ownership of development, deployment and maintenance work.
- Designed and implemented CI/CD pipelines for internal services.Build and deployment work moved into a repeatable delivery path.
- Led internal tools through development, deployment and maintenance.Responsibility extended beyond writing code to keeping the services running.
- Built infrastructure with infrastructure-as-code practices.Also onboarded with Cisco NSO for telecom development.
Jan 2022
– Dec 2022
Built an open-source update monitor that reached roughly 100 community servers.
Automation projects grew out of operating a modded community server and solving the failures that affected its users.
- Warned server operators before Workshop updates broke sessions.The Steam Workshop Monitor reached roughly 100 servers, the pre-verification ceiling. It is early code, kept as an origin story rather than current best work.
- Built practical Python automation and Discord integrations.Public work includes the Workshop monitor and a Telegram-to-Discord update bridge.
- Kept a personal infrastructure practice running alongside client work.Used VMware, Docker, CI/CD and Linux administration; the homelab started in 2021 and still hosts this site.
May 2021
– Oct 2021
Turned first hands-on server work into a homelab practice that still runs today.
This was my first paid professional IT environment and the point where classroom foundations became daily support work.
- Diagnosed, serviced and repaired computers for real users.Provided day-to-day IT support alongside the hardware work.
- Built practical foundations in virtualization and networking.Worked with VMware, basic networking and WordPress maintenance; access to a physical server started the homelab habit.
2017
– 2022
Kept a modded server in sync for 30–40 concurrent players, twice a week, for roughly five years.
Unpaid operations work began four years before my first professional IT role. Player counts and cadence are my own figures.
- Owned a recurring service from provisioning through maintenance.Ran the dedicated Windows Server box, mod set, update rollouts and client synchronization solo.
- Built the supporting communication systems around it.Also operated a self-hosted TeamSpeak 3 server and Discord bots for the group.
- Turned an operational pain point into a public tool.The update burden directly produced the Steam Workshop Monitor above.
Working set
Skills
Evidence-backed areas I use in delivery, operations and technical enablement.
Platform & delivery
- GitLab CI/CD
- Docker & containerization
- Kubernetes administration
- Ansible & Terraform
- Helm, ArgoCD & GitOps
Systems & security
- Linux administration & hardening
- Kubernetes security
- Cilium & Tetragon
- Grafana observability
- VMware ESXi & vCenter
Software & automation
- Python & Bash
- Flask applications
- MySQL & schema design
- RabbitMQ queue architecture
- Cisco networking
Applied AI & enablement
- Claude Code administration
- Anthropic Claude API
- Agentic workflows & assistants
- LangChain & LangGraph
- MCP & agent skills
- Prompt engineering
- Hands-on lab authoring
Credential record
Certifications
Kubestronaut, achieved September 2024. The Linux Foundation umbrella award for holding all five Kubernetes credentials below at the same time; it is not a sixth exam. I am not renewing the components as they expire, so this is an achievement earned in 2024 rather than an actively maintained status.
- CKA Certified Kubernetes Administrator Apr 2024 – Apr 2027 Valid through Apr 2027
- CKAD Certified Kubernetes Application Developer May 2024 – May 2026 Expired May 2026
- CKS Certified Kubernetes Security Specialist Aug 2024 – Aug 2026 Valid through Aug 2026
- KCNA Kubernetes and Cloud Native Associate Sep 2024 – Sep 2026 Valid through Sep 2026
- KCSA Kubernetes and Cloud Native Security Associate Sep 2024 – Sep 2026 Valid through Sep 2026
- CCNA CCNA Automation · Cisco Feb 2023 – Aug 2028 Valid through Aug 2028
Background
Education
- 2019 – 2022 IT Engineer, Information Technology VSŠ ŠČ Kranj
- 2015 – 2019 Computer Technician STŠ ŠČ Kranj
Communication
Languages
- Slovenian
- Native
- English
- Full professional
Contact