Jakob Skjerning
Owner at Substance Lab
Kolding, Region of Southern Denmark
Summary
👤
Senior🎓
Top SchoolJakob Skjerning is an experienced web developer and founder with 17+ years building user-centric web applications and SaaS platforms, primarily using Ruby on Rails. As owner of Substance Lab he combines a designer’s eye for usability with disciplined, test-driven backend engineering and a taste for simplicity. His hands-on history stretches back to 2000 across PHP, Python, ASP and SQL Server, and includes practical backend contributions to open-source Rails projects such as a Redmine GitHub hook and the activerecord-sqlserver adapter. Clients value his clarity, focus on web standards, and ability to turn complex integrations into manageable, maintainable systems. Based in Kolding, Denmark, he’s available for consulting and brings both entrepreneurial instincts and a long track record of shipping friendly, reliable software.
17 years of coding experience
9 years of employment as a software developer
Computer Science (AP), Computer Science (AP) at Handelshøjskolen i ÅrhusSilkeborg Amtsgymnasium
English, Danish, German
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (17)
json-parser10
json10
git10
ruby-rails10
github-webhooks10
jsonp10
databases10
rails10
ruby10
sql-server10
redmine10
parsing10
sql10
activerecord10
database10
Programming languages (14)
Github contributions (5)
koppen/redmine_github_hook
Aug 2009 - Apr 2022
Allow your Redmine installation to be notified when changes have been pushed to a Github repository.
Role in this project:
Backend Developer
Backend DeveloperContributions:3 releases, 122 commits, 7 PRs in 12 years 10 months
Contributions summary:Jakob primarily contributed to the backend functionality of the Redmine Github Hook plugin. Their work involved implementing the core logic to receive and process notifications from GitHub, including parsing JSON payloads and updating Redmine repositories. Furthermore, they refactored the code to improve its structure, added tests, and incorporated error handling to ensure reliable operation. The user also made significant improvements to the plugin's deployment by incorporating git commands.
installationrubywebhooks-catcherredminechanges
rails-sqlserver/activerecord-sqlserver-adapter
Sep 2008 - Oct 2008
SQL Server Adapter For Rails
Role in this project:Back-end Developer / Database Engineer
Back-end Developer / Database EngineerContributions:6 commits in 16 days
Contributions summary:Jakob primarily contributed to the back-end logic of the SQL Server adapter for Rails. Their work focused on improving the adapter's interaction with SQL Server, including fixing bugs related to data type handling, and improving performance when querying. The user implemented enhancements such as handling limit and offset in order clauses, and ensuring that the adapter correctly handles multi-line insert statements. Furthermore, they switched the database when attempting to recreate it and updated the code to handle UTF8 columns correctly.
sql-servertinytdsrailssqlruby
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