05.11.2025 aktualisiert

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System Architect

Berlin, Deutschland
Deutschland
Computer Engineer
Berlin, Deutschland
Deutschland
Computer Engineer

Profilanlagen

senolcolak082024-cv.pdf

Über mich

CTO and cloud architect with 25+ years in Linux, Kubernetes, Ceph, OpenStack and automation. building high-availability, open-source cloud infrastructures. Expert in Ceph, Hypervisors, Linux, ITSM, DevOps and large-scale system design, combining hands-on engineering with leadership.

Skills

ProxmoxAPIsAmazon Web ServicesProxy-ServerApple Mac SystemsArchitekturAutomatisierungBash ShellBorder Gateway ProtocolBillingDelphiC#UbuntuInvestitionenCloud ComputingApache CloudStackDatenbankenComputer EngineeringBeratungContent-EntwicklungContinuous DeliveryData CentersOracle Data GuardLinuxDevOpsDisaster RecoveryDjangoBildungssystemElasticsearchMail Transfer AgentEnterprise Resource PlanningOracle ExadataVersandFailoverSteuerungHypervisorITILIt-GovernanceInfrastrukturBestandsführungssystemVPNIt Service ManagementJunosPythonKernel-Based Virtual Machine (KVM)PostgreSQLGroßrechnerMySQLSAP ERPNagiosNfsv3Citrix SystemsNGINXOpen SourceOpenvpnOpenStackOracle DatabasesOracle FinancialsOracle RacSQL DeveloperAuslagerungParadigmenProduktdesignQuick EMUlator (QEMU)Forschung & EntwicklungAnsibleAnforderungsanalyseEinzelhandelSambaSAP ApplicationsSAP HANASAP ImplementierungSAP R/3Service ManagementSoftwareentwicklungSquidSystemarchitekturAusbildungsaktivitätenBenutzerunterstützungVirtuelle MaschinenWireless Access PointXen-ServerCephLayer 2 Tunneling ProtocolNetwork RoutersScriptingGoogle CloudLoad BalancingComputer-Netzwerk-BetriebCloud PlatformMetrikenSuse LinuxSystemverfügbarkeitFirewallsBackendPostfixGitLabVarnishKubernetesHashicorpTeam ManagementPuppetSicherheitsbestimmungenTerraformOpenBSDNetwork ServerAnsible TowerDockerIT-ProjektmanagementOracledb
Experience
  • Linux 25+ years
  • Team Management 15+ years
  • IT Service Management (ITSM) 15+ years
  • Hypervisors Xen/KVM/Qemu 20+ years
  • Openstack 5+ yrs
  • Proxmox 10+ yrs
  • Ceph 8 years
  • Kubernetes 7 years
  • Ansible 8 years
  • GitOps 4 years

Employment
  • Chief Technical Officer
    2022 - PRESENT
    Kubedo GmbH
    • Created a company from scratch with ITSM and an inventory system. Hostbill, a CRM implemented with back-end services and product development.
    • Developed MVP for cloud management services. Automation and back-end configurations implemented.
    • Acquired new customers and implemented features. After the launch, we had eight paid customers.
    Technologies: Django, Python 3, Ansible, Ansible Tower, VyOS, Terraform, Linux, IT Service Management (ITSM), Kubernetes, ITIL, Team Management, DevOps, Firewalls, Security, Infrastructure as Code (IaC), GitOps, OpenStack, Hypervisors, Docker, MySQL, Amazon Web Services (AWS), Cloud Computing, Architecture, Cloud, Continuous Deployment, HashiCorp, Ubuntu Linux, Proxy Servers, Python, VPN, Networking, Ubuntu, Back-end, IT Infrastructure, Ceph, NGINX, Scripting, Proxmox
  • Founder
    2020 - 2022
    Acik Kaynak Fikirler (AKF)
    • Created opensource courses for IT, including Linux, Docker, Kubernetes, Ansible, and Scripting.
    • Built a community of around 8,000 subscribers and educated more than 10,000 people for the prepared hands-on laboratory courses.
    • Developed a course environment on Play-with-Docker and online Docker in the Docker Linux console. Keycloak and the Docker-in-Docker environment were prepared from scratch.
    Technologies: Education, Training, Content Creation, VyOS, Firewalls, Infrastructure as Code (IaC), Hypervisors, Docker, MySQL, Architecture, Cloud, Continuous Deployment, Ubuntu Linux, Python, Ubuntu, Back-end, Scripting, Proxmox
  • Cloud Systems Architect
    2017 - 2020
    unbelievable Machine
    • Provided %99.998 SLA to our customers within six months. Before my services, the SLA with the *um Cloud was around %98. During my management of it, SLA was stable.
    • Migrated Spectre-meltdown of around 3,000 virtual machines from Xen to KVM. I developed a conversion script for Xen to KVM libvirt patch for hypervisors.
    • Created Kubernetes best practices on KVM hypervisors.
    Technologies: Ansible, KVM/Qemu, OnApp API, oVirt, Kubernetes, Xen, Citrix XenServer, VyOS, Team Management, Ansible Tower, DevOps, Firewalls, Security, Infrastructure as Code (IaC), OpenStack, Hypervisors, Docker, Elasticsearch, Amazon Web Services (AWS), Cloud Computing, Architecture, Cloud, Ubuntu Linux, Python, VPN, Networking, Ubuntu, IT Infrastructure, NGINX, Scripting
  • Chief Technical Officer and Co-founder
    2014 - 2017
    Hundertserver
    • Created a DevOps-as-a-service product and a company that provides services around that. The company had grown from 4,000 MRR in 2014 to 120,000 MRR in 2017.
    • Built the central hyper-converged system on XenServer. We used GlusterFS, DRBD, and Vyos routers on the hypervisors. I designed and implemented the systems, and my design managed more than 5,000 systems.
    • Developed a fully managed backup system for our customers. I used Bacula and Bareos backup tools and puppet automation to deploy our solution.
    • Created a ground-breaking hypervisor router environment. Each of our hypervisors had a Vyos virtual router. We scaled our infrastructure on three different continents and 10 different data centers.
    • Implemented OpenVPN mesh network and scripted and integrated Vyos.
    • Configured Mikrotik and Vyos for the customer Meinhotspot. Its 5,000 mini access points ended on our Vyos router and firewalls to reach the internet.
    • Developed the Hundertserver HS+ product. I created an automation interface in Python for our product. Puppet and Scala frameworks were used for DevOps-as-a-service environment creation.
    • Converted XenServer hypervisors to Proxmox environments. Licensing benefits on 200 servers.
    • Implemented ITSM by adopting iTOP into service management. KPI and service desk analysis began to be used as metrics for the company.
    • Introduced OKRs to the company, two cycles run before the leave.
    Technologies: Puppetlabs, Ansible, Linux, Proxmox, XenServer, VyOS, MikroTik, MySQL, Elasticsearch, Checkmk, ITSM, IT Service Management (ITSM), Kubernetes, ITIL, Team Management, DevOps, Firewalls, Security, OpenStack, Hypervisors, Docker, Cloud Computing, Architecture, Training, Cloud, Ubuntu Linux, Squid Proxy Server, Proxy Servers, Squid, Python, VPN, Networking, Varnish, Ubuntu, IT Infrastructure, NGINX, Scripting
  • Technology Renewal and Technology Consultant
    2013 - 2014
    KoçSistem
    • Led a datacenter migration project for an insurance company called Allianz. We migrated the 50-racks datacenter uninterrupted, including the legacy mainframes and Oracle Exadata. A €2 million budget project was done for €250,000.
    • Acted as joint project manager for an insurance customer, BNP Paribas. Migrated their datacenter to another provider and managed Oracle, storage, and Network operations.
    • Consulted on technology renewal and governance for a pharmaceutical wholesaler company. After the consulting, the company invested €20 million less for its five-year plan. The customer was using SAP with Oracle DB and had huge performance problems.
    • Provided technology renewal and analysis consulting for a big retail company. We offered the company to use open-source alternatives on their enterprise technology stack. By consulting, they decided to use alternative databases to Oracle.
    Technologies: SAP, Storage, Hypervisors, ITIL, Firewalls, Cloud Computing, Architecture, Training, Cloud, Proxy Servers, VPN, Networking, IT Infrastructure, Scripting
  • Chief Technical Officer
    2011 - 2013
    Tüm Eczac Kooperatifleri Birlii
    • Migrated legacy ERP system to SAP ERP system on a 2,000-employee organization.
    • Used open source enterprise technologies for the technology stack, including Xen, Vyatta, and Mikrotik. TCO increased by %90.
    • Managed 23 different city teams in coordination. Led technical involvement and deployment of the software in 50 branch offices.
    • Mentored and led the use of open source technologies, including Linux, Xen, KVM hypervisors, Vyatta (Vyos), Bacula backup, Openvpn, l2tp, Postfix, Samba, MySQL, Nagios, and PostgreSQL.
    Technologies: SAP, IT Project Management, ITIL, IT Service Management (ITSM), Oracle, ITSM, VyOS, Firewalls, Security, Hypervisors, MySQL, Architecture, Education, Squid Proxy Server, Proxy Servers, Squid, VPN, Networking, Ubuntu, IT Infrastructure, NGINX, Scripting
  • Chief Information Officer
    2005 - 2011
    Farmalojistik A.S.
    • Implemented Oracle RAC for the company databases. Oracle 11g.
    • Managed Postfix mail server and OpenBSD packet-filter firewall implementations.
    • Wrote outbound integrations on Python and Bash scripts.
    Technologies: Linux, ITSM, IT Project Management, Team Management, Oracle DBA, SAP Basis, Xen, Oracle PL/SQL, Oracle, IT Service Management (ITSM), ITIL, Amazon Web Services (AWS), VyOS, Firewalls, Hypervisors, MySQL, Architecture, Education, Squid Proxy Server, Proxy Servers, Squid, Python, VPN, Networking, Ubuntu, IT Infrastructure, Scripting
  • R&D Engineer
    2004 - 2005
    POS
    • Led development and R&D of software for gas stations.
    • Maintained software for Turkish Lira. A 6-digit reduce operation. All the statically configured values on the point-of-sale hardware were converted to use fewer digits.
    • Managed R&D using Linux on POS software. Introduced OSS to the commercial use cases.
    Technologies: Python 2, C#, Delphi, MSSQLCE, Oracle, Proxy Servers, IT Infrastructure, Scripting
Experience
  • Kubedo Engine | A Cloud Agnostic Managed Services Platform
    https://kubedo.com
    A Django-based application allows clients to register Gmail and GitLab and use their Cloud credentials to deploy their infrastructure to their cloud environment.

    I fully designed and implemented the software. The software triggers server-side operations via using Ansible playbooks. Monitoring is also initiating AIOPs operations by looking at the use patterns.
  • Hundertserver HCI Infrastructure and Creating Managed Services Company
    https://hundertserver.de
    I co-founded a company called Hundertserver GmbH. I was the chief architect responsible for creating our hyper-converged infrastructure.

    I created a hyper-converged solution from open source tools. We used XenServer/Proxmox/KVM, GlusterFS, DRBD, VyOS, BGP, OpenVPN, Checkmk, ELK, and Ceph storage. Our solutions include managed Kubernetes and database (MySQL/PostgreSQL). I created automated cluster services on these technologies. We deployed the solutions via Puppet and Ansible. We implemented ITSM solutions around iTop.
  • SAP Infrastructure with Xen Hypervisors
    I created the biggest architecture in the volume of billing transactions (creating 5,000 bills per hour) in the SAP R3 environment. SAP did not have a customer like that; I designed a dispatching and load balancing mechanism for SAP R3 instances. On the back end, I used Oracle Real Application Clusters (RAC), and later we migrated to Oracle Exadata.
    Starting from the sizing of the environment, all the management and the R/D of the environment were created small scale. We created an IT department of 20+ people for the SAP implementation project. We managed a $60 million budget in six years.

    Highlights:
    I designed and implemented a very efficient and open-source infrastructure. I used Xen/Hypervisor and MikroTik routers, which saved us around %90 of the planned investments.
Skills
  • Languages
    Python, Python 3, Python 2, C#, Delphi
  • Tools
    Ansible, Ansible Tower, KVM/Qemu, Squid Proxy Server, Squid, Terraform, OpenVPN, Puppet, iTop, HashiCorp, VPN, Varnish, NGINX, Citrix XenServer, Checkmk, Keycloak, Oracle RAC
  • Paradigms
    DevOps, Continuous Deployment, ITIL
  • Platforms
    Linux, Kubernetes, Xen, Proxmox, XenServer, OpenStack, Docker, Ubuntu Linux, Ubuntu, Oracle, Amazon Web Services (AWS), MacOS, oVirt, Google Cloud Platform (GCP)
  • Storage
    MySQL, Elasticsearch, DRBD, Ceph, Oracle DBA, Oracle PL/SQL, MSSQLCE, Oracle Cloud, SUSE
  • Other
    Computer Engineering, VyOS, Education, Training, Hypervisors, ITSM, Team Management, Firewalls, Security, GitOps, NFS, Cloud Computing, Architecture, Cloud, Proxy Servers, IT Infrastructure, Scripting, Kubernetes Operations (kOps), MikroTik, Infrastructure as Code (IaC), High Availability Disaster Recovery (HADR), Networking, Back-end, Software Engineering, Computer Science, Content Creation, SAP, Storage, IT Project Management, IT Service Management (ITSM), SAP Basis, SAP R/3, IT Management, Failover Solutions, Oracle Data Guard
  • Frameworks
    Django
  • Libraries/APIs
    OnApp API, Puppetlabs
Education
  • Bachelor's Degree in Computer Engineering
    1996 - 2001
    Eastern Mediterranean University - Famagusta, Cyprus
Certifications
  • CKA - Certified Kubernetes Administrator
    JAN 2025 - JAN 2027
    Linux Foundation

Erfahrung

Berufserfahrungmehr als 10 Jahre
Freelancer seit2024

Sprachen

DeutschgutEnglischverhandlungssicherTürkischMutterspracheBosnischgut

Projekthistorie

Performance Optimization and Ongoing Support for Ceph-based OpenStack Clouds

German Edge Cloud

Internet und Informationstechnologie

50-250 Mitarbeiter

Worked with a managed service provider operating multiple OpenStack environments and delivering Ceph and OpenStack support to downstream cloud providers. Despite using NVMe-based storage, the client was facing severe IOPS bottlenecks and Ceph performance issues that critically impacted their service delivery.
Through deep analysis and benchmarking (shared publicly on our blog: HCI & Ceph Performance and etcd Benchmarking), we identified underlying latency and configuration issues. Within two weeks, we achieved a 20x improvement in IOPS, removing the primary delivery blocker. We continued to support and maintain their environment in the following months, ensuring performance stability and resilience.

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