About Sebastian
English
Native or bilingual
Dutch
Native or bilingual
Turkish
Conversational
Experience
- EDOMATCHFREELANCE DEVOPS ENGINEERHUMAN RESOURCESJanuary 2025 - Today (1 year and 5 months)Amsterdam, Netherlands
- I provide ongoing DevOps support for a small production environment
- I manage cloud infrastructure, deployments, and automation
- I implemented Prometheus for better insights on how the production environment was functioning
- I refactored the original Helm charts to reduce duplication
Tech stack: Terraform, Helm, Kubernetes, AWS, Prometheus - GovernmentFREELANCE DEVOPS ENGINEERPUBLIC SECTORSeptember 2024 - Today (1 year and 9 months)The Hague, Netherlands
- I implemented Hashicorp Vault and integrated it with the Gitlab CI pipelines, Kubernetes and Ansible.
- I played a role in improving the agile processes (Scrum SAFE) in the team. As a former Engineering manager I had good insights into what was working and what wasn’t.
- I setup the initial version of the monitoring stack using prometheus and alert manager to push alerts to a Mattermost channel. This gave us more visibility in what components were having issues that needed to be looked into.
- I refactored the Ansible codebase which resulted in less complexity.
- I refactored the Flux CD repo to reduce duplication and introduce standards that allowed for better readability and contribution to the codebase.
Tech stack: Terraform, Ansible, Vault, Elasticsearch, Prometheus, Alertmanager, Mattermost, Grafana, Kafka, Flux CD - ADEVINTA/EBAYSENIOR ENGINEERING MANAGERE-COMMERCESeptember 2022 - August 2024 (1 year and 11 months)Amsterdam, NetherlandsI was a Senior engineering manager for the First Party Advertising tribe. I oversaw 3 teams with a mix of Backend/Frontend/SRE engineers (around 25 people total) and worked closely with several product managers while keeping the product manager role for the platform team.
- I successfully completed a 2 year cloud migration project where I was responsible for the technical vision spanning the entire product. Focus area’s: Up-skilling engineers, Splitting the project in understandable roadmap items, Budgeting our public cloud costs, Stakeholder management.
- I set the technical direction to move away from traditional config management towards Golden Images
- I set the technical direction for our terraform repository. The setup we had was a single run that managed all the infrastructure but the runs were long and the impact area was big. This changed to smaller and contained runs.
- I Implemented a initiative based way of working with a clearer focus on outcomes and creating a project lead role
- I still jumped in on incidents and minor technical work when I had time to keep my skills sharp
Tech stack: Terraform, Saltstack, Ansible, Vault, Packer, Consul, Nomad, Clickhouse, Elasticsearch, Graphite, Prometheus, Grafana, Datadog, AWS, Openstack, OKTA, Kafka
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Education
- Computer ScienceUniversity of Applied SciencesComputer Science
- Electrical EngineeringUniversity of Applied SciencesElectrical Engineering