Sebastian Wiesner
Data Engineer
Copenhagen, Capital Region of Denmark
Summary
🤩
Rockstar🎓
Top SchoolSebastian Wiesner is a seasoned data engineer with 17 years of technical experience, currently building production-grade pipelines for energy trading and analytics in Copenhagen. He designs and operates low-latency, reliable data platforms across AWS, Snowflake, Python, Java and SQL, having ingested and maintained 130+ external data sources to support trading decisions. Comfortable working directly with traders and quantitative stakeholders, he translates complex domain requirements into robust, production-ready systems and CI/CD workflows. An active open-source contributor, Sebastian has improved high-profile projects like Sphinx and Magit and worked on system-level Rust tracing integrations, reflecting a strong background in tooling, reliability and developer experience. His career spans cloud-native analytics, Snowflake marketplace work and a prior civil-engineering drafting background, giving him an uncommon mix of rigorous engineering, domain pragmatism and cross-border experience in Switzerland, the Netherlands and Denmark.
17 years of coding experience
4 years of employment as a software developer
Zeichner Fachrichtung Ingenierubau EFZ, Bauzeichnen und architektonisches CAD/CADD-Design, Zeichner Fachrichtung Ingenierubau EFZ, Bauzeichnen und architektonisches CAD/CADD-Design at Baugewerbliche Berufsschule ZürichMaster of Science - MS, Artificial Intelligence, Master of Science - MS, Artificial Intelligence at Vrije Universiteit Amsterdam (VU Amsterdam)Berufsmaturität, Technik, Architektur, Life Sciences, Berufsmaturität, Technik, Architektur, Life Sciences at Berufsmaturitätsschule ZürichBachelor's degree, Wirtschaftsinformatik, Bachelor's degree, Wirtschaftsinformatik at ZHAW School of Management and Law
German, English, Dutch
Github Skills (65)
restructuredtext10
python10
package-management10
testing10
ruby10
systemd10
trace10
syntax-checking10
project-management10
linux10
emacs-lisp10
cvs10
socket10
command-line-parser10
emacs10
Programming languages (35)
Github contributions (5)
flycheck/flycheck
Oct 2012 - Nov 2016
On the fly syntax checking for GNU Emacs
Role in this project:
Backend Developer
Backend DeveloperContributions:10 releases, 3812 commits, 224 PRs in 4 years 1 month
Contributions summary:Sebastian contributed to the core functionality of Flycheck by modifying its underlying syntax checking mechanisms and error reporting logic. They focused on refactoring existing code and enhancing the efficiency of processing, including improving error message display and optimizing filtering. Additionally, they made changes to the command-line arguments of specific syntax checkers.
elispripgrepsyntax-checkinggnu-emacschecking
cask/cask
Feb 2013 - Apr 2016
Project management tool for Emacs
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:142 commits, 15 PRs, 16 pushes in 3 years 3 months
Contributions summary:Sebastian primarily contributed to the core functionality of the Emacs package management tool, Cask. They enhanced the tool's capabilities by implementing features such as listing and updating packages, adding a command to print the package version, and incorporating a package-file directive. The user also focused on improving the security and maintainability of Cask by replacing the `load` function with a manual reading and evaluation process and refactoring the codebase to improve resource handling. Moreover, the user added functionality to improve the error reporting and integrate with EPL library.
emacsproject-management-toolmanagement-toolproject-managementemacs-lisp
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