Ceph Experts in Germany

Jens R.

Technical Product Owner

Kerpen

Last position:

Platform Architect & Senior Developer at Direct client, industrial measurement technology, medium-sized company

Technical leadership across hardware, firmware, and software teams; scope: hardware/firmware team (4 people) and leadership group (5 people)
Consolidated and documented a product family that had grown over more than 15 years and aligned it with CRA compliance — from the bare-metal I/O module to the cloud interface.
Provided the most important customer product with the essential requirements and architecture documentation within two months — for a firmware landscape that had grown over more than 15 years. It now supports the customer’s modernization strategy.
Established a monthly reporting line to the supervisory board and executive board within three months: nine meetings since 12/2025. The report itself is versioned and built from the CI pipeline; it is based on automatically collected activity and release data instead of assessments.
Built a container-based CI/CD infrastructure from scratch: cross-compilation, host tests, and documentation builds in one continuous pipeline.
Introduced declarative QA gates for DevOps and development artifacts — from the start using lefthook instead of pre-commit, executed in a dedicated container image.

Technologies used: arc42, req42, tpo42, docToolchain, PlantUML, ArchiMate, C4 model, ADR, C, C++ (GTest), CMake, Bare Metal (ARM Cortex-M3/M7), OCI containers, Jenkins, lefthook, Prometheus, Grafana, SBOM, CRA, OPC, SCADA, PLC integration, IPv6 migration, Zero Trust, Sociocracy 3.0, Cynefin

Salim C.

Cloud / Systems Architect

Stuttgart

Last position:

Cloud / Systems Architect

Development and introduction of operations processes
Preparation of complete documentation packages (including incident management and operations support) to meet compliance requirements
Introduction of a workshop on IaC (Infrastructure as Code)
Technical consulting for the project security concept (ISMS)
Installation and operation of Kubernetes clusters on AWS, on-prem, and Azure
Hybrid cloud architecture design (on-prem, Hetzner, AWS)
Analysis and troubleshooting of incidents and system outages
Network adjustments for firewall rules, gateways, OpenVPN settings, and IPsec tunnels (pfSense)
Technical consulting on Bitbucket, Jenkins, and GitLab CI/CD pipelines
Consulting on Ansible deployments and infrastructure automation
Consulting on building a scalable system in the cloud (AWS / Azure)
Technologies / Tools: Ansible, Terraform, AWS, Azure, VPN, pfSense, Jenkins, Bitbucket, Kubernetes, GitLab Runner, ISMS, Golang, Prometheus, Grafana, S3, Lambda, RDS, ECS, Cognito, OIDC, Harbor, MinIO, Postgres, Redis, Keycloak, Ceph, Proxmox, CloudFormation, PostgreSQL, Flux CD, Hetzner, IONOS, Sonatype Nexus Repository, Entra ID, Dex IdP, Pulumi

Jorge P.

Software Engineer – AWS and Kubernetes Specialist

Berlin

Last position:

Software Engineer – AWS and Kubernetes Specialist at Citti

Creation, maintenance and hardening of Kubernetes clusters employing Ansible and ArgoCD
Keywords: Ansible, AWX, Kubernetes, NetApp, Prometheus, CI/CD ArgoCD, SSO, Fluent-bit, HAProxy, Calico, Keycloak, oauth2-proxy, SealedSecrets, kubeseal, Aqua kube-bench, CIS-Benchmarks, Aqua Trivy operator

Robin W.

Senior Platform Engineer & Cloud Architect

Berlin

Last position:

Founder & Consultant · Platform Engineering & AI Infrastructure at RootVector.ai

Built and operate a hybrid Kubernetes platform across bare metal and cloud to validate multi-GPU workloads, security-zone isolation, and disaster recovery.
Operate self-hosted AI coding agents in the platform's Git workflow, from issue triage to pull-request review; every change is gated by manifest diffs and policy checks in CI.
Co-developed a sensor-fusion and GPU edge-inference platform selected by the European Defense Tech Hub from 50 solutions for field testing.

Tungi D.

Technical PMO | Delivery Master | LLM-Expert

Last position:

Technical PMO | Delivery Master | LLM-Expert at Stealth - NDA

Owning RAG, LLM-System, ML-ops-Pipelines for various startups in Insurance, Banking, Energy (KRITIS)

Holger G.

Test Automation Engineer, Quality Assurance Consultant

Last position:

Test Automation Engineer, Quality Assurance Consultant at T-Systems

Poliks – State Police System for information, communication, and case management and other state variants (ViVa, Bravo, customs)
Developed a test framework for test automation to replace an existing proprietary test client for new developments, focusing on easy maintenance and simple extensibility for new technologies
Designed the architecture
Implemented the architecture
Created a proof of concept by migrating existing test cases into the new test framework
Platform: C#, .NET, Jira, XRay, Confluence, Playwright, Selenium, UI Automation, Appium, HTML, Git, VMWare, Windows 11, Linux

Roman B.

Lead SAN/Storage & Backup Consultant / Architect

Düsseldorf

Last position:

Lead SAN/Storage & Backup Consultant / Architect at Daimler/Mercedes-Benz

Led a small team of Storage/Backup consultants responsible for EMEA region data center transformation across 200 DCs
Developed and defended HLD and LLD designs for SAN (Brocade), block storage (HPE Primera/Alletra), NAS (EMC Unity), object storage (Iternity with iCAS FS), and backup (Commvault)
Performed build and configuration of ~25 data centers, coordinating with network, compute, and security teams
Developed new processes and standards for infrastructure builds and finalized hardware purchases and BOM preparation
Created and executed testing approach including DR tests, and handed over builds to operation and migration teams
Trained other storage consultants to ensure SLA compliance
Technologies: Brocades, HPE/IBM/EMC/NetApp/CEPH, vSAN, NSX, TSM, Veeam, Commvault, tape libraries, drives & VTLs

Anton K.

Head of Overall Technical Integration NSC / Hadoop Cloud Development

Munich

Last position:

Head of Overall Technical Integration NSC / Hadoop Cloud Development at IABG

Head of overall technical integration NSC (National Secure Cloud, project with approx. 60 employees).
Technical integration of all subprojects into one product, definition of interfaces and basic components of a cloud including hardware, technical architecture of the IABG platform.
Development of a Cloud Management Platform (CMP) capable of creating private/mixed clouds of any complexity based on a textual description with one click or interactively.
CMP also includes the complete hardware management lifecycle.
Kubernetes, OpenStack and Hadoop are used as the foundation.
The management layer includes Harbor, Gitea, Longhorn, Keycloak, Rancher and Jenkins, which are configured automatically.
Private cloud can run any customer workloads, including a full Hadoop layer with HDFS, Spark, MapReduce, Mesos, HBase and around 20 additional ML/DL technologies.
Hadoop worker clusters can also be installed automatically without Kubernetes on bare metal or commodity hardware.
OpenStack with Nova, Neutron, Ironic, Swift, Cinder, Ceph.
Development of a Java application Rudi: SOAP, REST, containers, DB.
Technologies: Kubernetes (K3s, Rke2, Minikube, Harbor, Gitea, Jenkins, Longhorn, Keycloak, Rancher), OpenStack (Nova, Neutron, Keystone, Swift, Ceph, Cinder, Sahara, Magnum, Kayobe, Kolla, Bigrost, Ironic), Hadoop (HDFS, Ambari, Solr, Livy, Ranger, YARN, Tez, HBase, Kafka, Hive, Zookeeper, MapReduce, Spark, Oozie, Flink), virtualization (Kubernetes (K3S), VMware, Oracle), scripting (Ansible, Puppet, Juju, Shell, Groovy, Gradle, Maven).

Taher S.

DevOps Engineer

Last position:

DevOps Engineer at Confidential

Working with developers, security, and operations teams to align requirements
Supporting product owners and development teams in using logging and monitoring solutions based on the Elastic Stack
Developing and standardizing log schemas as well as defining practical standards for observability
Designing and further developing logging architectures for complex, distributed multi-tenant environments
Connecting application and infrastructure logs as well as security tools and metrics
Optimizing data flows and modeling for analysis and reporting purposes
Building automated infrastructures using Terraform/Terragrunt and Ansible
Maintaining and further developing CI/CD pipelines in GitLab as well as automated development environments in Hetzner Robot
Operating and automating Proxmox clusters including Ceph storage
Setting up and operating Kubernetes (k3s) clusters on Fedora CoreOS including base services such as Vault, OpenLDAP, and HA Proxy
Implementing security-critical infrastructures according to BSI baseline protection and securing existing systems
Supporting the operation of solutions in cloud environments (including AWS)
Working in agile teams using Scrum and Kanban
Technologies/ applications: Elastic Stack (Elasticsearch, Logstash, Beats/Elastic Agent, Kibana), Terraform, Terragrunt, Ansible, GitLab CI/CD, GitOps, Proxmox, Proxmox Ceph, Kubernetes (k3s), OpenShift, Helm, Kustomize, Vault, OpenLDAP, HA Proxy, Hetzner Robot systems, AWS, Prometheus, Grafana, Syslog Linux/Windows, Docker, NGINX, Apache Security & Compliance (BSI baseline protection, SIEM/SOC)

Daniel W.

Web Developer and Linux System Administrator

Aachen

Last position:

Web Developer and Linux System Administrator at Freelancer

Consultation on setting up a web server with Apache2 and PHP FPM and an email server with Postfix and Dovecot for Learn4good Ltd.
Programmed website under-construction.bermudafunk.org in collaboration with a designer and client for bermuda.funk Freies Radio Rhein-Neckar e.V.
Consultation and network setup on-site including switches, routers, Wi-Fi, network monitoring, firewalls, and installation of sFirm banking software for The Swiss Quality Consulting GmbH
Consultation on website management and development, email migration from Outlook to cPanel, image optimization, and setting up Square payments for The JABA Group Ltd.
MS365 consultation, email setup, and document synchronization for PK reno GmbH
Development and integration of WooCommerce plugins, B2B shop setup, and custom shipping label export for Nurso GmbH
Minor changes implementation for existing Kirby system for Julia Rautenhaus
Analysis and fixing of WordPress website after broken updates for Alina Frey
Linux server hardening, updates, and throughput optimization for 3proxy servers for Lietparkas UAB
Malware removal from hacked WordPress website for Timo Horn
Cold email outreach system setup with Postfix and Dovecot and script development for Aman Ketebo
Customized Docker container creation based on AlmaLinux with ImageMagick 7 and consultation on Docker installation for Henry Hook
Plesk hosting environment management, code fixes, external supplier integration, and content support for First Class Corporation
Shopify theme customization, feature development, and payment integration consultation for Youro GmbH
Intel camera support on Ubuntu after upgrade for Making stories with a lesson
NginX configuration support on Windows Servers for a NodeJS application for ARMBRUSTER empiric it
Competitor email verification mechanism analysis for Casey Monaghan
Plugin development and API connector to Inswitch for freelance website payments for Mediaquotes
Private XMPP server setup on Raspberry Pi for Antonio Codespoti
WordPress website recovery after broken plugin update for A & R Tennis
Microsoft account and Office/Outlook migration support for Prof. Dr. Hanns-Ferdinand Müller
Customization and performance optimization of client websites for sk.design
VPN configuration and hacked server cleanup for Xisio Informationssysteme GmbH
PeerTube server setup and maintenance for Lupin Vondosky
Lightweight WordPress booking solution programming tailored to client needs for AP Online Marketing
Code refactoring, bug fixing, and business/technical consultation for RentAfrika
SellYourSaas setup and deployment infrastructure configuration for I-Motion SARL
Server, email, GitLab, project management, password management software, and VPNs setup and maintenance for Markus Sattler
Custom development for over 10 WordPress projects for TOGEMAXX media & webdesign
WooCommerce shop setup and FTP supplier product import development for SERVOMED GmbH
Open-source contributions to Whonix components, iptables to nftables migration, shutdown inhibition investigation, and IPv6 support addition for ENCRYPTED SUPPORT LP
Custom feature development, performance optimization, update management, email delivery support, plugin bug fixes, and translations for KU Europe GmbH
Custom plugin/theme development, server infrastructure management, support for 100+ WordPress websites, API connector development, deployment script setup, VPN configuration, DNS, email, and web hosting support for giftGRÜN GmbH
Server setup, web and email hosting migration, and website maintenance and development for Eisbaden.de
Custom WordPress and Shopify development for EcomPlus GmbH
Hacked website recovery and hosting migration for Be Brave gUG
Finalization of development tasks left incomplete by another developer for Medicare Consulting GmbH
Recovery of unbootable hacked server for SK-Software, Entwicklung & Beratung

Hobby projects:

Development and running of a web chat application
Development and running of an email service
Development and running of a darknet link list
Development and running of a darknet web hosting platform
Code contributions to open source projects such as LMMS, Audacity, and Ubuntu

Tan P.

DevOps & Fullstack Engineer

Hanau

Last position:

DevOps Engineer in the DevOps Team at Rise-World

Implementation of specified DevOps solutions to automate infrastructure (Terraform, Bicep, CloudFormation, Ansible) on-premises datacenter (Ovirt, Proxmox, Ceph Cluster, MinIO) and private cloud.
Administration, configuration and implementation of CI/CD DevOps pipelines (GitLab, GitFlow) to support development process (Artifactory, Prometheus, Istio, service mesh, Helm Chart, OpenShift (Red Hat Enterprise) / Kubernetes cluster), Red Hat Satellite.
Administration, setup, monitoring and patching of Linux infrastructure based on Red Hat Enterprise for Dev, Test and QA.
Use of Scrum and Kanban methods.
Administration, configuration and implementation of security standards for deploying on Dev, Test, QA and Prod stages of the new ePA applications.
Development of new plugins and add-ons needed on current infrastructure.
Database support.
Data analytics support (Python, Spark, Pandas, Power BI, Splunk Enterprise).
Implementation of best practices for DevSecOps and BizDevOps using GitOps (ArgoCD), Streamlit framework, Semaphore Ansible UI.
Configuration and testing of iperf, uperf, sysbench using benchmark-operator for external source data and IoT/MDM devices, creating reports via ELK / OpenSearch.
Building a new Databricks platform to collect and analyze big data from different sources and IoT devices into Hadoop framework (Python, Pandas, PySpark, Power BI, Apache Airflow).
Building backend data aggregation and processing to automate configuration deployment between different OpenShift clusters and big data framework (Python, Pandas, PySpark, Apache Spark, PostgreSQL, Django 2, Ansible Automation, Jira JSM).
Building a new ML pipeline platform using Kubeflow, TensorFlow, KServe.
Data extraction, transformation and loading from different data sources including structured and unstructured data to analytic DWH / big data cluster using Python, Pandas, Polars, Power BI, Django backend and PostgreSQL.
Setup of new DevOps Test and QA HashiCorp Vault cluster for PKI and IAM.
Configuration and testing of automated patching based on CVSS score, SIEM-integrated CVEs.
Use of Nexpose and InsightVM to scan vulnerability events in network, host, container and application.
Design and implementation of secure and scalable AWS architectures including VPC, EC2, S3, RDS and Route53 and similar setups on Azure and GCP.
Automated system provisioning and deployment using CloudFormation templates.
Configuration of IAM roles, policies and permissions to ensure secure access control.
Patch management, backup automation and disaster recovery setup on AWS infrastructure.
Monitoring and optimization of system performance using AWS CloudWatch and AWS Trusted Advisor.
Support of VMware services (vSphere, Aria, Horizon) and the virtual desktop environment.
Development and maintenance of CI/CD pipelines using Jenkins, GitLab CI/CD and AWS CodePipeline with interface to Nutanix.
Configuration of AWS CloudWatch to monitor application performance and system events.
Planning and execution of migration of on-premises applications to AWS cloud platforms.
Deployment of containerized applications using Docker and Kubernetes in AWS environments.
Deployment of internal software packages between availability zones using AWS CodeDeploy.
Building and deploying ML models using Scikit-learn, XGBoost and Spark MLlib including hyperparameter tuning, model evaluation and production deployment.

Marcus W.

Administrator, DevOps

Dülmen

Last position:

Administrator, DevOps at KZVB

Planned and implemented new network infrastructure (VLAN, LACP, DMZ, structured cabling)
Migrated from VMware to KVM using Oracle Linux Virtualization Manager (OLVM), including CPU pinning
Hardened the entire environment using SELinux (KVM hosts, container hosts, database servers)
Configured and operated the virtualization platform with OLVM and Ansible-based provisioning
Containerized and redeployed critical services: WordPress, Jenkins, PostgreSQL, MariaDB, Subversion with Apache + AD integration
Developed Ansible playbooks for automated deployment and configuration management
Integrated Foreman for repository and security management in the DMZ
Produced technical documentation in Markdown; organized in Bookstack
Coordinated with external vendors (e.g. HPE) for hardware installation and setup
Delivered all contributions documented and reproducible in Markdown

Alexander W.

Freelance Head of Development / Strategy Consultant

Last position:

Freelance Head of Development / Strategy Consultant at LabMaker GmbH

Consulting on a wide range of open science hardware projects in the fields of electronics, mechatronics, and optoelectronics
Comprehensive system analysis and DFM optimization of a novel open hardware miniaturized two-photon microscope
Exchange with scientists from renowned academic institutions to align the customer’s work in the best possible way
Production coordination with local and international partners for PCB assembly, CNC machining, and optics
Process analysis for product design, production planning/execution, product lifecycle, and product data management
Coaching employees from all departments on the requirements that complex technical products place on business processes
Development of a comprehensive PLM & PDM concept tailored to the needs of development and manufacturing
Initiating intensive and direct cross-departmental exchange to identify improvement potential
Planning shopfloor layout improvements with the production team and supporting the implementation process
Quick onboarding of two new English-speaking colleagues in technical product management and development
Ad-hoc and in-depth training of employees in the use of software tools such as KiCad or Autodesk Inventor
Consulting on long-term development into a scalable, even stronger partner for the open science hardware community

Anicet N.

Senior Test Specialist

Wincheringen

Last position:

Senior Test Specialist at RWE Supply & Trading

Created a test strategy for manual testing and test automation
Automated regression and end-to-end API test cases
Performed functional testing on the Curvecraft portal
Documented manual test procedures
Planned and executed end-to-end and regression tests
Test case design, test case creation, development of test scenarios
Analyzed test results, logged defects, and retested fixes
IT environment: Open API, C#, RestSharp, Azure, Azure DevOps, Visual Studio, NSwag, PostgreSQL, Azure Test Plan

Björn O.