Dan A. Zamfir, Developer in Munich, Bavaria, Germany
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Dan A. Zamfir

Verified Expert  in Engineering

Cloud Developer

Munich, Bavaria, Germany
Toptal Member Since
June 7, 2021

Dan is a seasoned IT professional and a freelance DevOps engineer with more than 10 years of experience in automation, system administration, and solution support with a proven track record in delivering outstanding results. He is a self-learner, able to handle multiple tasks simultaneously without losing composure, able to adapt quickly and flexibly to new tasks. He has a track record for diagnosing complex problems and consistently delivering effective solutions.


PAYBACK GmbH, Part of the American Express Group
Jenkins, Puppet, Docker, Ubuntu Linux, MacOS, CI/CD Pipelines, Jenkins Job DSL...
PAYBACK GmbH, Part of the American Express Group
IT Automation, Automation, WebLogic, Ansible, Jenkins, Jenkins Job DSL...
PAYBACK GmbH, Part of the American Express Group
WLST, Bash Script, Oracle WebLogic Application Server, webMethods...




Preferred Environment

Linux, Unix, MacOS, Vim Text Editor, Cloud, Kubernetes, Git

The most amazing...

...full-stack legacy platform automation I've done reduced the downtime from 12 hours to 40 minutes and transitioned from bimonthly to biweekly releases.

Work Experience

Mobile DevOps Engineer

2019 - PRESENT
PAYBACK GmbH, Part of the American Express Group
  • Provided ownership for Jenkins, Puppet, and mobile servers (20 Ubuntu and macOS).
  • Maintained, expanded, and supported continuous deployment solutions using Jenkins and Puppet.
  • Performed root cause analysis and troubleshooting for Android and iOS builds.
Technologies: Jenkins, Puppet, Docker, Ubuntu Linux, MacOS, CI/CD Pipelines, Jenkins Job DSL, Jenkins Pipeline, Jira, Bitbucket

DevOps/Automation Engineer CE

2014 - 2019
PAYBACK GmbH, Part of the American Express Group
  • Served as an automation engineer, technology owner, and third-level support.
  • Developed custom Ansible modules and plugins using Python, as a key member of the implementation team for Ansible.
  • Automated solutions for enterprise technologies like WebLogic from binary installation to domain creation and apps deployments, which reduced the deployment and downtime on the production environment from 8 hours to 40 minutes.
Technologies: IT Automation, Automation, WebLogic, Ansible, Jenkins, Jenkins Job DSL, Jenkins Pipeline, Python, Apache Tomcat, webMethods, Stunnel

Technical Process Management Global

2012 - 2014
PAYBACK GmbH, Part of the American Express Group
  • Acted as technical process manager global, IT analyst, application support, Oracle WebLogic administrator, WebMethods administrator, and provided Jenkins deployment and automated solutions.
  • Migrated an old, out of support version of WebMethods from physical SuSE machines to virtualized SuSE machines, before the deadline with minimum experience of WebMethods.
  • Led WebLogic migration to RedHat EL running on VMs.
Technologies: WLST, Bash Script, Oracle WebLogic Application Server, webMethods, Virtualization, System Migration

Senior Solution Support and Deployment Analyst

2008 - 2012
  • Acted as the service owner, problem manager, incident manager, recovery manager, IT analyst, Oracle DBA consultant, application support, and BEA and ORACLE Weblogic Administrator.
  • Provided the main support for three global logistic applications including booking, exception management, and warehouse management within a team of 15 members.
  • Contributed to multiple projects mainly oriented on application stabilization and/or migration, being the key person in all the tests and deployments.
  • Awarded with VESPA (very special achievements) in 2009 and 2011 for successful project results and building sustainable, long-term, and partnership-based business relationships with our customers.
Technologies: IT Business Analysis, Oracle DBA, App Support, BEA WebLogic Server, WLST, Problem Management, Incident Management, Bash, Linux, Unix, Migration

IT Specialist

2007 - 2008
  • Provided support for servers, database, and service monitoring for several international customers. Servers like: Windows 2003, AIX, HP-UX, Solaris. Database and applications like Oracle, SAP, Tivoli Storage Manager, and Tivoli Workload Scheduler.
  • Solved the most critical issues according to the SLA, redirecting problems to the respective team.
  • Performed deployments of Tivoli Monitoring as a contributor of a pilot project and executed daily manual checks on SAP and Oracle.
Technologies: System Administration, Monitoring, AIX, HP-UX, Solaris, Oracle, SAP, PeopleSoft, IBM Tivoli Storage Manager, IBM Tivoli Workload Scheduler

Canary Deployment with Spinnaker

Canary deployment on AWS EKS with Docker, Kubernetes, MinIO, Prometheus, Grafana, and Spinnaker

Canary is a deployment process in which a change is partially rolled out, then evaluated against the current deployment (baseline) to ensure that the new deployment is operating at least as well as the old. This evaluation is done using key metrics that are chosen when the canary is configured.

React and Layr Full-stack App Deployment on GKE with Terraform

Automated the deployment of a full-stack React, Layr, and MongoDB app on Google Cloud Platform with Terraform, using Cloud Build for continuous delivery, Prometheus for monitoring, and Grafana for dashboard visualization.

Google IT Automation with Python



Red Hat Certified System Administrator

Red Hat


Jenkins Job DSL, Node.js, Jenkins Pipeline


Vim Text Editor, Git, Jenkins, Terraform, Amazon EKS, Google Kubernetes Engine (GKE), Grafana, IBM Tivoli Workload Scheduler, WLST, Ansible, Apache Tomcat, Puppet, Jira, Bitbucket, Stunnel


Bash, Python, Bash Script


DevOps, Automation, Continuous Integration (CI), Continuous Delivery (CD)


Linux, Unix, MacOS, Kubernetes, Google Cloud Platform (GCP), Amazon Web Services (AWS), Docker, Spinnaker, AIX, HP-UX, Solaris, Oracle, webMethods, Ubuntu Linux


Django, Flask


MySQL/MariaDB, MongoDB, Oracle DBA


CI/CD Pipelines, Site Reliability Engineering (SRE), Cloud, Prometheus, Google Cloud Build, Linux Server Administration, IT Automation, MinIO, Loki, System Administration, Monitoring, SAP, PeopleSoft, IBM Tivoli Storage Manager, IT Business Analysis, App Support, BEA WebLogic Server, Problem Management, Incident Management, Migration, Oracle WebLogic Application Server, Virtualization, System Migration, WebLogic

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