Jan Vlnas
Staff Engineer at Mews
Prague, Prague, Czechia
Summary
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RockstarJan Vlnas is a Senior Software Engineer based in Prague with 15 years of hands-on experience building reliable back-end systems. Currently at Mews, he focuses on pragmatic, test-driven development and improving core library behavior—evidenced by his contributions to the composite_primary_keys Active Record project where he refined primary key handling and edge-case tests. His work shows attention to data integrity and lifecycle nuances (e.g., destroyed records and string key edge cases), which often goes unnoticed but prevents subtle production bugs. Comfortable operating deep in the stack, he brings steady expertise in Ruby/Rails ecosystems and a practical mindset for shipping durable solutions. Colleagues can expect a developer who prioritizes correctness and long-term maintainability as much as feature delivery.
15 years of coding experience
Stackoverflow
912reputation
28kreached
32answers
1question
Github Skills (14)
ruby10
activerecord10
testing10
sql9
gist6
instagram-graph-api6
slack-api6
nodejs6
twitter6
javascript6
same-origin-policy6
slack6
github6
tizen6
Programming languages (32)
Github contributions (5)
composite-primary-keys/composite_primary_keys
Jul 2011 - Jun 2012
Composite Primary Keys support for Active Record
Role in this project:
Back-end Developer
Back-end DeveloperContributions:19 commits in 11 months
Contributions summary:Jan focused on enhancing the `composite-primary-keys/composite_primary_keys` repository, which provides support for composite primary keys in Active Record. Their contributions primarily involved modifying the `to_key` method to accurately handle primary key retrieval for both single and composite keys, including edge cases like destroyed records. They also wrote and updated test cases to ensure the correct behavior of the `to_key` method, including addressing issues related to string keys. These changes demonstrate a clear focus on refining the core functionality of the library and ensuring its robustness.
activerecordcomposite-primary-key
jnv/dokuwiki-plugin-data
Oct 2016 - Jan 2023
Contributions:9 pushes, 1 branch in 6 years 3 months
querystructuredphpdokuwikistructured-data
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