Sebastiaan Tammer
Co-Founder at Tammer IT Solutions
Utrecht, Utrecht, Netherlands
Summary
👤
Senior🎓
Top SchoolSebastiaan Tammer is a cloud-native engineer and co-founder with 11+ years of hands-on experience designing secure, automated platform solutions for enterprises and startups from Utrecht. He blends deep Linux, DevOps and security expertise (OSCP, CKA, RHCE) with practical software craftsmanship—authoring Go tooling, Terraform modules and CI/CD automation for large-scale environments at BMW, de Volksbank and De Bijenkorf. As a freelancer and through BETER. he focuses on Kubernetes, GitOps and Infrastructure-as-Code to help teams manage resilient, up-to-date platforms on their preferred cloud. A regular open-source contributor, he has improved security and configuration handling in the widely used containrrr/watchtower project, surfacing a pragmatic attention to secrets and observability. Known for simplifying complex problems without sacrificing stakeholder needs, he equally enjoys mentoring teams and pairing on challenging technical work.
11 years of coding experience
9 years of employment as a software developer
Master of Science (MSc), Business Informatics, Master of Science (MSc), Business Informatics at Utrecht UniversityGymnasium, Profile Science and Engineering, Gymnasium, Profile Science and Engineering at Het Nieuwe Eemland
Dutch, English, German
Github Skills (13)
docker10
go10
dockers10
devops9
security9
logging9
automation9
automations9
notification9
configuration-management8
continuous-delivery8
kubernetes-pods7
kubernetes7
Programming languages (6)
Github contributions (5)
containrrr/watchtower
May 2020 - Jun 2020
A process for automating Docker container base image updates.
Role in this project:
Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:2 reviews, 7 commits, 8 PRs in 1 month
Contributions summary:Sebastiaan primarily focused on enhancing the security and functionality of the watchtower application. Their contributions include removing debug prints of sensitive information, adding a tracing flag for more verbose logging, and implementing a feature to skip TLS verification for Gotify notifications. Furthermore, the user modified flag handling to allow secrets to be passed from files, improving security. The user's work touched on various aspects of the application, including notifications, logging, and configuration management.
devopsbase-imagedockerupdatesnotifications
tammert/helm-charts
Apr 2021 - Jun 2023
Helm charts for my projects
Contributions:12 releases, 2 reviews, 2 PRs in 2 years 2 months
chartsmy-projectshelmhelm-chartskubernetes
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