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Simon Tesar

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Letztes Update: 27.03.2024

DevOps und Platform Engineer, Kubernetes-Experte

Firma: Simon Tesar LTD
Abschluss: nicht angegeben
Stunden-/Tagessatz: anzeigen
Sprachkenntnisse: deutsch (Muttersprache) | englisch (verhandlungssicher)

Dateianlagen

cv_210224.pdf

Skills

I am an experienced engineer with over ten years in the DevOps, platform and software Engineering fields.

I specialise in infrastructure as code, cloud and container technologies and everything that revolves around them.

The projects I work on are usually a composition between infrastructure and software development. Examples include public cloud, platform or software as a service solutions.

Additionally, because I have a background in hands-on systems engineering and networking, I understand how cloud-native technologies relate to the hardware they actually run on.

I am as proficient in automating infrastructure as I am in creating services, platforms or automation tools themselves.
 

Projekthistorie

04/2023 - bis jetzt
DevOps and Platform Engineer
PPI AG (Banken und Finanzdienstleistungen, 500-1000 Mitarbeiter)

At PPI I am part of a team that develops a platform for applications in the financial sector, customers include large banks and insurance companies. The project revolves around:
- Providing a complete stack of dependencies like database, storage, CI/CD and messaging systems for the applications to be developed on the platform
- Supporting multiple hyperscalers and the inhouse cloud for that platform to run on
- Developing a framework to enable operators to manage instances of the platform

My responsibilities specifically have been:
- Developing and consulting on Kubernetes Operators as an external expert
- Driving the development of an internal management API for the platform written in Golang
- Consulting on and developing tasks of the internal cloud platform

Primary technologies: Golang, Kubernetes Operators, Terraform, ArgoC

06/2021 - 03/2023
Senior Software and Platform Engineer
IONOS Cloud by 1&1, United Internet Group (Internet und Informationstechnologie, 1000-5000 Mitarbeiter)

Goal of the project Managed Virtual Network Functions was development, modernizing and addition of high availability to existing Virtual Network Functions in the public IONOS Cloud:
  • ○  Application Load Balancers [0]
  • ○  Network Load Balancers [0]
  • ○  NAT Gateways [1]
    All services were managed via Kubernetes Operators and based on internal Cloud functions.
    I was very involved in architecting the new system and additionally in planning monitoring, continuous integration and deployment.
    Primary technologies: Golang, Kubernetes Operators, Linux, GitHub Actions, Argo CD, Keepalived, nftables, HAProxy
    [0] https://cloud.ionos.com/network/network-loadbalancer
    [0] https://cloud.ionos.com/network/managed-nat-gateway

02/2019 - 05/2021
Senior DevOps and Software Engineer
Unwired Networks GmbH (Internet und Informationstechnologie, 10-50 Mitarbeiter)

Developed several internal and public-facing services in a team or single-handedly:
  • Internal remote device management system distributing configuration, collecting metrics and serving as SSH-jumphost
  • OpenVPN-server management client and API via GRPC
  • MQTT-based device log system with Elasticsearch backend
  • Reimplementation of legacy APIs based on GraphQL
Held responsibility for production infrastructure:
  • Managed Google Kubernetes Engine clusters, bare-metal servers and corresponding accessories like monitoring
  • Replaced static ingress and logging setups with dynamic solutions
  • Moved existing infrastructure to a manageable state via a combination of Ansible, Terraform and Kustomize
  • Introduced a staging environment for a over 10 year old captive portal and hotspot system

01/2018 - 01/2019
Site Reliability Engineer
Cisco Systems Austria (Internet und Informationstechnologie, >10.000 Mitarbeiter)

  • Developed internal tools and services like Kubernetes Operators or Terraform Providers in Go
  •  Consulted software engineering teams on developing cloud-native applications
  • Automated creation and management of Kubernetes Clusters on AWS and on-premises VMWare vSphere
  • Contributed bugfixes and enhancements to open source parts of the Kubernetes ecosystem

09/2015 - 12/2017
Devops Engineer
APA-IT Informations Technologie (Medien und Verlage, 250-500 Mitarbeiter)

  • Designed and implemented a small SaaS platform based on Kubernetes and Google Cloud and implemented it in Go
  • Led workshops and trainings for internal and external employees on cloud-native techologies 
  • Designed and implemented a new CI/CD-system based on bare-metal Kubernetes and Jenkins

09/2013 - 08/2015
Linux System Administrator
Gentics Software GmbH (Medien und Verlage, 10-50 Mitarbeiter)

* Brought existing server and router infrastructure to a managed state via Puppet
* Designed and implemented new infrastructure concept based on Docker and LXC
* Held responsibility for the infrastructure part in all customer projects
* Containerized all Java and PHP-based products

Reisebereitschaft

Verfügbar in den Ländern Deutschland, Österreich und Schweiz
Profilbild von Simon Tesar DevOps und Platform Engineer, Kubernetes-Experte aus Wien DevOps und Platform Engineer, Kubernetes-Experte
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