✓ Berkay Güçlü

[Pipeline] stage (Ege University)
+ Diagnosed and repaired computer hardware and software issues and provided end-user technical support.
+ Installed and configured network devices (routers, switches, access points, firewalls) and built and maintained LAN infrastructure.
+ Installed and managed Windows Server 2012 R2 and 2016 environments, thin client and terminal systems.
Finished: SUCCESS

[Pipeline] stage (Özgür Yazılım A.Ş.)
+ Designed, deployed and managed highly available and scalable Kubernetes (RKE2, OpenShift, Talos Linux) cluster architectures; deployed and operated services such as GitLab, Jenkins, SonarQube, Nexus, Keycloak, Rocket.Chat, Jitsi, Nextcloud and OpenSearch on Rancher, and configured Longhorn backups.
+ Installed, maintained and optimized Red Hat and Debian based Linux servers for clients across various industries and scales.
+ Implemented server security, user authorization and system update policies; set up intrusion detection with Wazuh and OSSEC and vulnerability scanning with Nessus, and defined server hardening and firewall standards.
+ Deployed Keycloak in high availability and integrated SSO with GitLab, Zabbix, Nextcloud and Rocket.Chat; provided centralized identity management with OpenLDAP.
+ Built a HashiCorp Vault cluster backed by Consul; implemented secret injection into Kubernetes pods with Vault Agent and the Zabbix–Vault integration.
+ Designed and managed virtualization platforms based on KVM/QEMU, VMware and Proxmox, including resource planning and high-availability configurations.
+ Provided load balancing and high availability with Keepalived + HAProxy clusters and Envoy proxy.
+ Automated maintenance, monitoring and deployment processes with Bash and Python, and built custom tools to reduce manual operations.
+ Built fully automated CI/CD pipelines integrating Jenkins, SonarQube and Nexus, using Jenkins Configuration as Code and containerized jobs, and added code quality and security analysis with Fortify SCA and Dependency-Track.
+ Set up PostgreSQL automatic failover with Patroni and Consul and disaster recovery with repmgr and Barman; managed Valkey Sentinel, Redis Cluster and MongoDB replica sets, and ran backup and migration work for databases including MySQL.
+ Migrated from Elasticsearch to OpenSearch with cross-cluster replication (CCR) for disaster recovery; upgraded Graylog clusters from 2.x to 7.x and built log collection with Logstash, Nxlog and Graylog Sidecar.
+ Deployed and managed Kafka and RabbitMQ clusters, and built a disaster recovery setup for Kafka based on cross-cluster replication with MirrorMaker.
+ Installed and maintained management and monitoring tools such as Zabbix, Graylog/Rsyslog, Bacula and GitLab.
Finished: IN PROGRESS

# Infrastructure I built from scratch and keep evolving on a single Proxmox VE host to run my own services. This site runs on it too.
+ 3-node RKE2 Kubernetes cluster on Proxmox VE 9, with kube-vip API VIP, Longhorn distributed storage and Traefik ingress.
+ SNI-based routing with HAProxy; automatic certificates with cert-manager and Let's Encrypt DNS-01.
+ Self-hosted mail server with Stalwart (SPF, DKIM, DMARC, reverse DNS) and webmail.
+ Metrics with VictoriaMetrics, node-exporter and Grafana; monitoring and alerts with Uptime Kuma and ntfy; image update tracking with Diun.
+ Local LLM server with llama.cpp and Open WebUI; Python automation that summarizes daily system reports.
+ DNS-over-TLS with AdGuard Home and encrypted backups with restic.
Finished: SUCCESS

+ Linux System Administration 101-102-103-104
+ Kubernetes 101
+ Jenkins Workshop
+ Ansible Workshop
Finished: SUCCESS

+ Log Management and Analysis with Graylog
+ GNU/Linux System Administration (Level 1)
+ Server and Service Monitoring with Zabbix
+ Kubernetes and Container Technologies
Finished: SUCCESS