Christian D. - DevOps-Engineer

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Plagiari, Greece

Experience

Aug 2021 - Sep 2025

4 years 2 months

Plagiari, Greece

DevOps-Engineer

KfW Förderbank

Optimizing, maintaining, and managing the cloud infrastructure in Microsoft Azure for KfW customer projects
Migrating cloud-native services to Container Apps and scripting containerized infrastructure with Kubernetes
Implementing and maintaining the Landing Zone hub-and-spoke cloud automation architecture
Implementing and maintaining pipelines (Medallion, AI) for code/data analysis, consolidation, and visualization of all ecologically and economically relevant company data (Databricks, Data Lake, Azure Fabric, Power BI)
Automating application infrastructure, IaC, CI/CD across all stages (Dev, Test, Production) via Git/Terraform/Ansible and Azure Pipelines
Developing and implementing required cloud permission structures (RBAC, Entra ID, security policies)
Performing error analysis, stabilization, and security measures using Splunk and DevSecOps Elastic Search
Administering Linux (RHEL 8, 9; SLES) and Windows Server
Incident, change, and release management (ServiceNow, ITSM, Jira, HPESM)
Scripting (Bash, PowerShell, HCL, YAML)
Process automation and optimization in the agile KfW CI/CD pipelines DevSecOps environment
Documentation and knowledge management

Aug 2020 - Apr 2021

9 months

Frankfurt, Germany

DevOps-Engineer/Coordinator

DB Systel

Optimizing, maintaining, and managing AWS cloud infrastructure for DB Energie customers
Automating CI/CD across all stages (Dev, Test, Integration, Production) via Git/Jenkins pipelines and CloudFormation
Provisioning and decommissioning EC2/RDS instances (manually, via Ansible AWX, CloudFormation)
Infrastructure as Code with Terraform and Ansible
Automated patch management (OS level, VMs), error analysis, stabilization
Administering Linux and Windows
Incident and change management (ITSM, Jira)
Scripting and process automation, as well as process optimization
Documentation and knowledge management

Sep 2019 - May 2020

9 months

Munich, Germany

DevOps-Engineer

FITS

Optimizing, maintaining, and managing the FreeBSD-based secure cloud infrastructure for affiliated state banks and savings banks
Implementing and configuring application containers for Dev, Test, Int, and Prod (automation, scripting, shell, Ruby)
Log management, normalization, consolidation, data stream SIEM, Elastic Search
Resource monitoring
Providing multi-level support for configuration, deployment, and release management, as well as incident and escalation management
Network, firewall, and DNS administration
Software implementation
Process automation and process optimization
Documentation and knowledge management

Oct 2017 - Aug 2019

1 year 11 months

Bonn, Germany

DevOps-Engineer

Postbank Systems AG

Evaluating potential migrations of banking software systems to the cloud (lift ’n’ shift)
Evaluating and implementing cloud computing, private cloud, and hybrid cloud
Testing and comparing AWS, Microsoft Azure, and GCP
Setting up example PoCs for IaaS, PaaS, SaaS, and FaaS
Unified data streaming/analytics PoC for heterogeneous data pools
Building the private cloud with OpenShift in data centers
Implementing BaFin compliance requirements
Operations access management and controlled assignment of access rights
Log management and analysis
Resource monitoring
Documentation and knowledge management

Oct 2014 - Oct 2017

3 years 1 month

Bonn, Germany

Application Manager

Postbank Systems AG

Supporting the operation of banking applications in payment transactions and core banking systems
Optimizing, maintaining, and managing multichannel and multitier components
Automated deployments through the change management process (Dev, Test, Int, Prod)
Operations access management and controlled assignment of access rights
Establishing interfaces and workflows
Assisting with BaFin code compare security audits
Batch processing, creation, and maintenance
Log management and analysis
Resource monitoring
Fraud detection and prevention
Incident, escalation, and change management
Documentation and knowledge management

Oct 2013 - Sep 2014

1 year

Gütersloh, Germany

DevOps Engineer

Claas Agrosystems

Setup and operation of IT infrastructure for the 365FarmNet start-up in the agricultural sector
Implementation of modern cloud and big data technologies (AWS, Azure, Cloudbricks, Kubernetes, Docker)
Development of OSGi models, microservices and datastream Kafka/Felix/Karaf
Building multi-tier components and databases
Automated deployment in Dev, Test and Int environments via Chef-Server-Client and Kubernetes PoC
Production as on-premise infrastructure at Hosteurope
System access management and certificate management
Log management and analysis as well as monitoring and incident management
Configuration, testing, deployment and release management
Network planning and DNS management
KPI analysis and unified data analysis with Spark, Kafka and Databricks
Documentation and knowledge management

Aug 2012 - Sep 2013

1 year 2 months

Hamelin, Germany

Application Manager

Postbank Systems AG

Implementation of the multi-tier TXSuite application for managing and handling covered refinancing at BHW
Setup of multichannel architecture and databases
Integration via technical interfaces into the company's application landscape
Incident and escalation management
Batch processing and monitoring (24/7 hotline)
Log management, analysis and monitoring
System status dashboards and reporting
Optimization of application structures
Documentation and knowledge management

Dec 2011 - Jun 2012

7 months

Frankfurt, Germany

Operational Analyst

ING-Diba AG

24/7 support for operating the on-premise IT infrastructure from the command center
Monitoring of all IT-supported business processes
Escalation and incident management
Process management and continuous improvement
Monitoring of release and configuration management
Second-level support for in-house call centers
Organizational data center administration
Documentation and knowledge management

May 2007 - Nov 2011

4 years 7 months

Thessaloniki, Greece

DevOps Engineer/CTO

Multihosting OE

Founded and started a Greek hosting provider (multihosting.gr)
Developed modern pricing structures for the EU market
Planning, implementation and operation of the IT infrastructure with virtualization (OpenVZ, KVM, VMware, OpenStack)
Provisioning of dedicated and virtualized server systems
Network, firewall and security concepts
Accounting and business logic
Configuration and lifecycle management
Log management, monitoring and backup strategies (Bacula, Amanda)
Problem and escalation management
Helpdesk/multi-level support
Documentation and knowledge management

Apr 2006 - Oct 2011

5 years 7 months

Thessaloniki, Greece

System Administrator/Developer

Ratio Software Factory

Design, development, implementation and operation of the Mistral ERP system (in-house development)
Creation of new forms and functions in the internal development framework
Maintenance and upkeep of databases (MSSQL, DB2, Interbase, Firebird)
Development of migration and integration components
Deployment and release management
Customer helpdesk (multi-level support)
Documentation and knowledge management

Feb 2004 - Apr 2006

2 years 3 months

Thessaloniki, Greece

Application Manager/System Administrator

Metropolis SA/Emmetron SA

Operation, service and support of the software portfolio (in-house development) in the Balkan region
Installation, maintenance and support of document management (Adacta DMS) and mobile telecommunication solutions
Quality assurance and test automation
Development of a package distribution system with fuzzy logic and AI components
Multi-level customer support (Greek, English)
Release and deployment management
Implementation of interfaces to various ERP systems
Documentation and knowledge management

Feb 2002 - Feb 2004

2 years 1 month

Thessaloniki, Greece

System Administrator

Typos Thessaloniki Newspaper

Ensuring 24/7 operation of the IT infrastructure
Administration and maintenance of server infrastructure, networks and Windows terminals
Implementation and maintenance of Linux file servers and print servers
Design, implementation and operation of the newspaper's first online edition
Image editing (QuarkExpress, Photoshop)
Documentation and knowledge management

Mar 1999 - Jan 2002

2 years 11 months

Bochum, Germany

CEO/CTO/Development

Sagytar Web Arrangements

Founded and launched a publicly funded wedding-focused internet portal
Designed, developed and maintained websites and e-commerce applications for SMEs
Developed and implemented an online portal as an advertising platform including planning tools
Created pricing structures, marketing and sales strategies
Documentation and knowledge management

Jun 1996 - Sep 1999

3 years 4 months

Dortmund, Germany