Sergey Nartimov
CTO at BookFusion
Krakow, Lesser Poland Voivodeship
Summary
🤩
Rockstar🎓
Top SchoolSergey Nartimov is a CTO and seasoned software engineer with 17 years of experience leading teams and building backend systems from Krakow, Poland. He combines hands-on development with technical leadership, having led a 10-engineer product team at Toptal and served as CTO of BookFusion since 2016. A prolific open-source contributor in the Ruby and Elixir ecosystems, Sergey has contributed to high-profile projects like Sinatra, Rubinius and Elixir core (notably improving ExUnit assertions and ExDoc), and helped integrate authentication and notifications in Errbit. His background spans migrating legacy stacks to modern Rails architectures, test automation, and enhancing developer tooling and documentation. Known for pragmatic engineering and cleaner APIs, he often focuses on reliability, encoding/edge-case fixes, and improving developer experience. He holds a Bachelor’s in Computer Systems and Networks and brings a blend of consulting, training, and product-building experience to leadership roles.
16 years of coding experience
10 years of employment as a software developer
Bachelor’s Degree, Computer Systems and Networks, Bachelor’s Degree, Computer Systems and Networks at Belarusian State University of Informatics and Radioelectronics
English, Russian, Russian, Polish
Stackoverflow
7,970reputation
327kreached
54answers
0questions
npm-install
top-1%
github
top-1%
ruby
top-5%
ruby-on-rails
top-5%
Github Skills (52)
assertion10
unit-testing10
ruby-rails10
programming-language10
github10
back-end-development10
elixir10
testing10
timeago10
rspec10
rails10
ranges10
virtual-machine10
github-integration10
exunit10
Programming languages (10)
Github contributions (5)
brainspec/enumerize
Jan 2012 - Sep 2019
Role in this project:
Back-end Developer
Back-end DeveloperContributions:7 releases, 6 reviews, 271 commits in 7 years 8 months
Contributions summary:Sergey appears to be a back-end developer primarily focused on enhancing the `enumerize` Ruby gem. Their contributions involve implementing core features like default values, integration with ActiveRecord and Mongoid, and adding validation and scope support. The user also refactored code, improved performance, and added multiple attribute functionality to the gem. These changes suggest a focus on expanding and improving the functionality and usability of the gem within the context of Ruby on Rails applications.
mongoidrailsrubyactivemodelactiverecord
ryanb/nested_form
Jun 2012 - Dec 2013
Rails plugin to conveniently handle multiple models in a single form.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:80 commits in 1 year 6 months
Contributions summary:Sergey primarily contributed to the development of the Rails plugin, `nested_form`, designed for handling multiple models within a single form. Their work involved improving the codebase by using the `content_tag` helper for HTML generation, and refactoring tests to be more robust, including splitting tests to support different javascript versions. The user also implemented bug fixes to ensure the nested form functionality worked correctly, and enhanced the plugin's compatibility with Strong Parameters. Additionally, the user added new features such as adding the ability to toggle wrapper divs behavior.
ruby-on-railsrailsrubyrails-pluginhandle
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