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Refactoring and improving core APIs; implementing client change requests. Setting up metrics, traces, and logs monitoring infrastructure to support operations. Designing GitOps deployment and infrastructure as code. Applications and Systems Configuration in ArgoCD and Openshift. Confluence documentation of design, approach, and solution. Tech Stack: Java 8 & 21, Spring framework, JSP, Javascript, Bash Scripts, SQL, Grafana Stack, Opentelemetry, Docker, DB2, Maven, Kubernetes Kompose.

• Further development and ongoing maintenance of the existing WordPress site for EHF.at to revamp the responsive design and improve usability on mobile devices.
• Integration of WooCommerce into the existing site for full e-commerce functionality and digitization of the team sports apparel sales process.
• Implementation and configuration of an automated newsletter system to strengthen customer loyalty through regular updates and personalized offers.
• Ongoing maintenance including regular updates, performance optimizations, and security checks to keep the site up-to-date and functional.
• Project-related technical activities: PHP, CSS, and JavaScript.

• Owned day-to-day IT operations for Service Desk, Field Service, and on-call support, ensuring business continuity for a multi-site environment
• Led the transition from Lotus Notes incident tracking to ServiceNow, defining process design, workflows, roles, and reporting
• Implemented a modern telephony system with integrated reporting, enabling real-time visibility of volumes, wait times, and SLA adherence
• Launched a customer self-service portal and on-site walk-in support model to improve first-contact resolution and user experience
• Designed, documented, and rolled out SLAs, delivering targeted training for engineers and stakeholders to drive adoption and compliance
• Acted as process owner for service operations, establishing operating procedures, request/change/incident interfaces, and quality controls
• Partnered with business and IS/OT stakeholders to prioritize demand, reduce operational risk, and improve service reliability

• Development of a Custom Jenkins Shared Library (Groovy)

• Integration of security checks in CI/CD pipeline (Shift-Left Approach)

• Automated vulnerability scanning and remediation workflows

• GitOps-based deployments with ArgoCD

• Semantic versioning automation with Git integration

• Container lifecycle management (Build/Scan/Tag/Push)

• ArgoCD webhook integration for event-driven deployments

• Complete cluster automation with Ansible

• Bare-metal Kubernetes installation from scratch

• High-availability control plane setup

• Unified deployment system for multi-application orchestration

• Configuration management according to NIST SP 800-128

• Host security: Linux hardening, SELinux/AppArmor

• Network security: NetworkPolicies, micro-segmentation

• Application security: RBAC, Pod Security Standards

• Data security: Encryption at rest and in transit

• Defense-in-depth principles

• Certificate management with cert-manager

• Secrets management with External Secrets Operator connected to Vault

• Infrastructure monitoring with Checkmk

• Prometheus/Grafana monitoring stack

• Security event detection and logging

• Automated health checks and incident response procedures

• MetalLB load balancing for bare-metal

• Nginx ingress controller with SSL passthrough

• NetworkPolicies for security zones

• Rook-Ceph distributed storage, CNI configuration (Weave Net)

• Container & orchestration: Kubernetes (bare-metal), Docker, Helm

• CI/CD & GitOps: Jenkins (Custom Shared Library), ArgoCD, Groovy

• Automation: Ansible, Bash, Python

• Security: nftables, RBAC, NetworkPolicies, cert-manager, Vault, Sealed Secrets

• Monitoring: Checkmk, Prometheus, Grafana

• Storage & networking: Rook-Ceph, MetalLB, Nginx Ingress, Calico

• Collaboration: Jira, Confluence

• OS: Debian, Ubuntu

• Infrastructure automation with Ansible, AWX, Docker/DockerCompose/Kubernetes, GitLab, Bash, Python (Ubuntu)
• Infrastructure monitoring with Icinga2
• Software development in Python
• Qemu, KVM, libvirt

• Backend / Microservice Developer, DevOps, Test Automation
• ~100 Devs, ~10 Teams, per team: 1 PO, 1 Scrum Master, 1 UX, 1 Developer, 1 Tester
• .net core 8, 9, C#
• Microservices, Clean-Architecture, MediatR, CQRS
• GraphQL, REST, SDL
• Azure DevOps, CI / CD-pipelines, Azure-Service Bus, Rabbit-MQ, Kafka, Azure App Configuration, Azure KeyVault, Azure Kubernetes AKS
• Splunk, dashboards, custom metrics, Elastic-Search, Kibana (ELK)
• Azure SQL-Databases, Azure Cosmos DB
• Architecture decisions, event governance, COP (Backend, DevOps, FrontEnt, Test Automations)
• AI, Copilot, creating test templates
• Scheduler, Hangfire, Quartz
• Automated unit and integration tests
• Automated E2E tests, Playwright test automation, BDD, Gherkin, Cucumber
• Tracking of shipments
• GIS, GPS data, geofence, geo search, position tracking, asset positions
• Jira, Confluence
• Focus on high-performance message-oriented architecture (~xx million messages per month per service)
• Structured logging, Serilog, OTel, Splunk, Application Monitoring
• Integration of different position data sources (GPS-based data) into Azure Data Lake

• Setup and maintain Prometheus and Grafana via Docker for more than 2.000 services.
• Setup CI/CD with Ansible to provision and maintain Prometheus and Grafana.
• Metrics visualization and segregation in multiple dynamic dashboards.
• Setup of real time alerting for critical services.

• Further developing microservices (Go, .NET)
• Expanding gRPC APIs
• Maintaining Kubernetes clusters (AKS)
• Managing the system landscape
• Migrating Azure App Services to Kubernetes
• Creating and extending Azure Pipelines
• Developing a Go microservice to receive and send events from Azure Service Bus
• Integrating KEDA for autoscaling
• Technologies used: Go, .NET, Azure Portal, Terraform, Kubernetes, Helm, MongoDB, Jaeger, Grafana