Oleksandr Simonov
Founder And CEO at Amoniac OÜ
Tallinn, Harju maakond, Estonia
Summary
🤩
Rockstar🎓
Top SchoolOleksandr Simonov is a founder and CEO with 15+ years of hands-on experience building and leading technology products and teams, and nearly 20 years in the broader IT industry. Based in Tallinn, he runs Amoniac OÜ as a technology partner that combines engineering delivery with business-facing involvement, drawing on roles from developer and sysadmin to CTO. He has led development for healthcare analytics, programmatic B2B content platforms, and content-marketing automation, consistently focusing on performance and scalable back-end architectures. A pragmatic Rubyist, he contributes to notable open-source projects like rubyzip and roo, improving ZIP handling and XLSX parsing performance—work that reflects deep familiarity with file formats and low-level parsing. Comfortable switching between strategy and code, he routinely embeds himself in client projects to align technical decisions with business outcomes. His background in physics and broad university studies underpins a methodical problem-solving approach and curiosity across systems and materials.
15 years of coding experience
14 years of employment as a software developer
Student Computers, Student Computers at Nacional'nij Universitet 'Kievo-Mogiljans'ka Akademija'Student compositional and powder materials coatings, Student compositional and powder materials coatings at Ukrains'kij Deržavnij Mors'kij Tehnicnij Uniwersitet im. 'Admirala Makarova'Bachelor Physics, Bachelor Physics at Mykolajiv State Pedagogical University
Russian, Ukrainian, English
Github Skills (8)
file-handling10
nokogiri10
excel10
ruby10
data-structure9
performance-optimization9
data-structures9
encryption6
Programming languages (15)
Github contributions (5)
roo-rb/roo
Jul 2014 - Mar 2022
Roo provides an interface to spreadsheets of several sorts.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 1 review, 88 commits in 7 years 8 months
Contributions summary:Oleksandr focused on optimizing the performance of the xlsx file parsing functionality within the Roo gem. They addressed specific issues related to parsing speed, as indicated by the commit messages referencing performance improvements. Code changes primarily involve modifications within the `Excelx` class, indicating a focus on back-end logic and the parsing of spreadsheet data. Additionally, the user made adjustments to the base class for handling XML files and updated the version of the library.
xlsxexcelreaderxlssortsroo
rubyzip/rubyzip
Nov 2011 - May 2021
Official Rubyzip repository
Role in this project:Back-end Developer
Back-end DeveloperContributions:2 releases, 228 commits, 75 PRs in 9 years 7 months
Contributions summary:Oleksandr primarily focused on maintaining and improving the Rubyzip library. Their contributions included fixing constants, addressing UTF-8 filename issues, and code cleanup tasks. The user demonstrated a strong understanding of the library's internal workings by resolving specific issues in the zip entry handling and central directory. The contributions involved modifying code related to zip entry headers and central directory structures.
encryptionrubyrubyzipzip-extraction
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