Profilbild von Christian Kappen AWS | Cloud | DevOps | Infrastructure Architecture | Strategic Management aus Bonn

Christian Kappen

teilweise verfügbar

Letztes Update: 31.05.2022

AWS | Cloud | DevOps | Infrastructure Architecture | Strategic Management

Firma: Geek Cell GmbH
Abschluss: nicht angegeben
Stunden-/Tagessatz: anzeigen
Hourly/daily rates will be communicated upon request and depend individually on project scope, activity and conditions.
Sprachkenntnisse: deutsch (Muttersprache) | englisch (verhandlungssicher)




Christian Kappen is the Co-founder of Geek Cell GmbH, a software, service and consultancy company. He's been in the tech industry for more than 22 years. Christian has led international engineering organizations across multiple locations, working on big data and distributed architectures on AWS. He's passionate about software and service architecture and loves mentoring and coaching individuals and teams.


11/2021 - 07/2022
Interim Chief of Staff
PlanA.Earth GmbH (50-250 Mitarbeiter)
Energie, Wasser und Umwelt

We worked directly with CTO of PlanA. Together we defined the new strategy for the whole department in workshops. This included organizational development and system architecture development for the next 2 years. The new system architecture was implemented in the spring. We also supported Plan A in the complete recruiting process from CV screening to salary negotiation with new candidates and onboarding. We were also instrumental in carrying out the requirements for the technical part of the ISO27001 and SoC2 certification. In addition, we took over interim team leader positions until further employees were found and hired.

Environment: AWS, Ansible, Bitbucket, Lambda, Terraform, Terragrunt, Python, MySQL

12/2020 - 11/2021
Interim Site Reliability Engineer
 & Interim Engineering Manager
Schüttflix GmbH (50-250 Mitarbeiter)
Industrie und Maschinenbau

Introduction of Infrastructure as Code and complete migration from on-premise to AWS. All systems are designed to scale. Porting and provisioning of all servers using Ansible. Network and data flow planning. Introduction of Continuous Integration with autoscaling groups, load balancers and blue-green deployments. Introduction of central log management. Creation of the backup, maintenance, monitoring and operations concept. Training the developers on AWS with over 20 hours of video material in English. Guidance of the other Site Reliability Engineers until handover to the Engineering Manager. Development of the rights and roles concept in AWS. Implementation of measures for the upcoming tech due diligence.

Environment: AWS, Ansible, Gitlab, New Relic, Redis, Terraform, Terragrunt, Ubuntu, MySQL, PHP7

10/2020 - 11/2020
Interim Technical Agile Coach & Interim Quality Assurance Engineer
Schüttflix GmbH (50-250 Mitarbeiter)
Industrie und Maschinenbau

Conducting training and workshops on agile quality assurance. Introduction of Mob programming and agile working, establishment of DevOps mindset. Leadership of employees.

09/2020 - 09/2020
Interim AWS Cloud Engineer
SilverTours GmbH (50-250 Mitarbeiter)
Internet und Informationstechnologie

Lead the project team for the implementation of the new transactional emails. Describe the responsive emails using MJML, translate with Phrase and test with Litmus. Creation of the CI/CD pipeline. Blue-Green deployment in AWS ECS.

Environment: AWS, ECS, Litmus, MySQL, Phrase, PHP7

07/2020 - 08/2020
Interim AWS Cloud Engineer
Goldmedia Custom Research GmbH (50-250 Mitarbeiter)
Internet und Informationstechnologie

Transfer of on-premise hardware from 1&1 IONOS to AWS with Terraform. Introduction of CI/CD pipelines for staging and production. Provisioning of servers with Ansible.

Environment: AWS, Ansible, Apache, Docker + Docker Compose, Envoyer, GitHub, MySQL, PHP7

05/2020 - 06/2020
Interim Quality Assurance Engineer
SilverTours GmbH (50-250 Mitarbeiter)
Internet und Informationstechnologie

Leading the project team to implement the company-wide testing strategy. Creation of Docker containers for local testing and in the Gitlab CI/CD pipeline. Upgrades of packages used, advising developers on migration of new testing environment. Refactoring of existing unit tests. Training the entire IT department on agile testing.

Stop of the project because of the Corona pandemic.

Environment: AWS, Apache, Docker + Docker Compose, Gitlab, Nginx, MySQL, PHP7, PHPUnit

04/2019 - 05/2020
Interim AWS Cloud Engineer
SilverTours GmbH (50-250 Mitarbeiter)
Internet und Informationstechnologie

Complete porting of the back office system from on-premise to AWS with Terraform. Creation of the security and network concept. Porting of the 2TB MySQL. Porting of the NFS with several TB of data to AWS EFS. Porting and provisioning of all servers using Ansible. Introduction of Continuous Integration with Autoscaling groups, Load Balancer and Blue-Green Deployments. Introduction of centralized log management. Creation of the backup, maintenance, monitoring and operation concept. Training of developers on DevOps, AWS and Terraform.

Environment: AWS, Apache, Gitlab, New Relic, Lambda, Memcache, Molecule, MySQL, PHP7, Perl, Python, Packer, ProxySQL, Redis, Symfony, Terraform, Ubuntu, Zend Framework

06/2019 - 12/2019
Interim AWS Cloud Engineer
Medien und Verlage

Creation and implementation of the backup concept for the local NAS of the video editing department. Initial backup of 250TB using AWS Snowball to AWS S3 Glacier Deep Archive with subsequent incremental backup in Docker.

Assisted IT administration with heavy growth due to new employees. Troubleshooting local network, upgrading video editing machines and network to 10 GBit, assisting CTO with overall application process. Training staff on how to use AWS and Infrastructure as Code.

Environment: AWS, macOS, Windows, QNAP, Netzwerk

08/2017 - 03/2019
Senior DevOps Engineer
Trusted Shops GmbH (250-500 Mitarbeiter)

Porting of Monoliths to AWS using Terraform, Packer, Ansible, Consul and Vault. Migration from Jenkins to CircleCI, migration from Gitlab to Github, migration of all databases to AWS, introduction of ProxySQL for load balancing, provisioning, rolling deployments and upgrades of all servers with Ansible.

Introduction of standards in software development, introduction of modern development tools, conducting sessions and workshops on agile testing, clean code and dealing with technical debt, creating the company-wide testing strategy.

Environment: AWS, Apache, CircleCI, Docker + Docker Compose, Github, Instana, Java, JBoss, Keycloak, Lambda, MariaDB, Memcache, Molecule, MySQL Percona Cluster, Nginx, PHP, Packer, ProxySQL, Redis, Symfony, Terraform, TypeScript, Ubuntu, Vagrant, Vault

03/2012 - 07/2017
Teamlead Backend Development
Chefkoch GmbH (50-250 Mitarbeiter)
Internet und Informationstechnologie

Introduction of Scrum and Kanban for 6 teams, setup and management of 15 developers for agile working. Introduction of CI/CD pipelines and test automation.

Migration from PHP 5.0 to PHP 7, conversion from Memcache to Redis, conversion from Latin1 to UTF-8 (codebase + database), introduction of Atlassian Jira, Confluence and Bamboo. Introduction of Continuous Integration, introduction of unit testing, conversion from monolith to microservice architecture.

Environment: Bamboo, CoreOS, Confluence, Debian, Docker + Docker Compose, Drupal, Elastic Search, Git, Jenkins, Jira, MariaDB, Memcache, PHP, PHP Unit, Packer, Redis, Selenium, Silex, Squid, Subversion, Symfony, Ubuntu, Vagrant, Zend Framework

03/2011 - 02/2012
Senior Developer
werkenntwen GmbH (50-250 Mitarbeiter)
Internet und Informationstechnologie

Supervised 10+ developers in scaling the systems for 9.3 million users, further development of features for users and employees, creation of an in-house advertising server for more than 5 billion ad impressions per month, creation of reports for the management, further development of the in-house PHP framework.

Environment: Apache, CSS, C++, Debian, Javascript, Jenkins, Memcache, MySQL, PHP, Puppet, RabbitMQ, Squid, Zend Framework

02/2008 - 02/2011
werkenntwen GmbH (50-250 Mitarbeiter)
Internet und Informationstechnologie

Further development of features for the user, scaling setup and improvement of monitoring systems, introduction of Scrum and Kanban into software development.

Environment: Apache, Debian, Javascript, Memcache, MySQL, PHP, RabbitMQ, Zend Framework

10/2000 - 01/2008
Michel Developmen & Consulting GmbH & Co. KG (10-50 Mitarbeiter)
Internet und Informationstechnologie

Agency business for various clients in the B2B area, programming of a large web store in 15 languages and a portal for General Electric field staff. Creation of a workflow tool for the production of a print catalog in 10 languages.

Environment: Apache, Debian, CSS, Gentoo, Javascript, MySQL, PHP, Subversion, Mantis

Zeitliche und räumliche Verfügbarkeit

Personal preferences
  • Project duration: At least 3 months or longer
  • Preferably remote, 4-5 days per week (32-40 hours).
  • For hybrid projects in the Cologne/Düsseldorf area, I would be willing to spend a maximum of 1 day per week (i.e. 8 days per month in total) on-site for any team or alignment meetings.
In case of exciting project offers with different conditions I would be willing to make exceptions if necessary.

Sonstige Angaben

For interesting/innovative project proposals from any of the following industries/sectors, there is a high probability of receiving a timely response from me:
  • Cloud & Edge Computing
  • Big Data & Augmented Analytics
  • Electromobility
  • Green Energy/Greentech
  • FinTech
  • Healthcare/Biotech
  • IoT
  • Video processing
On the other hand, you can save any inquiries from the following industries/sectors:
  • Fossil fuels/non-renewable energies
  • Armaments, weapons and war industries
  • Companies that act/operate unethically in terms of human rights, animal rights and/or environmental issues, such as (but not limited to)
    • Abercrombie & Fitch
    • Axel Springer SE incl. all subsidiaries and brands
    • Meta/Facebook
    • Monsanto
    • Nestle
    • Palantir
I am not, never have been and never will be interested in employee leasing or the "Swiss model". Please refrain from any inquiries in this direction or you will be blocked without comment.