Krzysztof Ruszczyński
Software Engineer
Warsaw, Masovian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolKrzysztof Ruszczyński is a pragmatic software engineer with roughly 15 years of hands-on experience building backend systems in PHP, PL/SQL and JavaScript across finance, travel and enterprise tooling. He has deep experience modernizing internal systems and APIs (Laravel, Symfony, MariaDB/Postgres, OpenAPI) and a proven track record working in cross‑functional, multilingual teams in Warsaw and Switzerland. Comfortable with both legacy stacks and testable, dependency‑injected architectures, he has contributed to open source components used alongside commercial CUBE Tools and integrated systems like IBM DOORS and Power BI. Known for tackling data‑centric challenges and API-driven integrations, he blends database expertise with pragmatic engineering to deliver maintainable, production-grade software.
11 years of coding experience
16 years of employment as a software developer
Msc, Computer Science, Msc, Computer Science at Warsaw University of Technology
English, German, Polish
Github Skills (17)
phpspreadsheet10
spreadsheet10
excel10
ods10
php-library10
libreoffice9
xlsx9
xls9
php9
doctrine-orm9
gnumeric9
phpexcel9
database8
cube5
server-side4
Programming languages (1)
Github contributions (5)
krzysztofruszczynski/Krsc-Reports-PHPExcel-Framework
Nov 2014 - Jun 2020
KrscReports is a php library written in order to create complex PHPExcel and PhpSpreadsheet files (for example by using separation of layers). It allows to write code for creating part of worksheets, which can be used across many files. It supports generating files with many worksheets and styles. It is easy to extend library with own functionality.
Contributions:36 releases, 181 commits, 30 PRs in 5 years 7 months
php-libraryphpexcelphpspreadsheet
krzysztofruszczynski/PhpSpreadsheet
May 2017 - Nov 2018
A pure PHP library for reading and writing spreadsheet files
Contributions:4 PRs, 7 pushes, 2 branches in 1 year 6 months
phpphp-librarypure-phpexcelspreadsheet
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