Tomasz Kowalczyk

I have 15+ years of experience in the industry with a lot of projects under my belt. Hire me to write software, design architecture and APIs, consult technical vision, conduct trainings, perform code reviews, help with recruitment process, and many more. I solve problems in a way that makes them disappear.
Let me know what are you looking for by sending an email or using one of the methods listed below.

PHP Symfony PHPUnit Behat Doctrine Composer XDebug C C++ C++11 C++14 STL CMake make Frontend JavaScript HTML5 CSS3 Vue Databases SQL MySQL SQLite PostgreSQL MongoDB Tools git nginx Apache Redis RabbitMQ Varnish memcache API REST Facebook Twitter Instagram Youtube FinTech FIX QuickFIX SWIFT MT Earthport Techniques TDD BDD SOLID GRASP Scrum Architecture DDD CQRS Hexagonal Event Sourcing OS Linux Ubuntu Debian Windows Other Java Go XSD UML Blockchain

Projects

Apocrypt unified cryptography interface library (closed source),
EarthportApi Earthport API client based on XSDragon (closed source),
Modulink Vocalink Modulus validator (closed source),
Nevar PHP variable value types descriptions (GitHub).
Numbase arbitrary numbers base converter (GitHub),
Platenum most comprehensive PHP enumerations library (GitHub),
Serializard fast and flexible serialization library (GitHub),
SimilarWebApi official SimilarWeb API client (GitHub),
Shortcode advanced shortcode / BBCode parser (GitHub),
Swiftheart SWIFT MT and FIN parser (closed source),
XSDragon XSD to PHP class generator, parser, and serializer (GitHub).

Public

2023	(May) PHPers Summit: API Anatomy, (May) DobryCraft: API, (April) PHPers Warsaw #22: API Lessons Learned... 2nd Edition, 4Developers: API Lessons Learned, ConFoo Montreal: API Anatomy, ConFoo Montreal: Equational reasoning,
2022	SymfonyCon Paris: Jeopardy, PHPCon Poland: Equational reasoning, PHPCon Poland: Jeopardy, SyliusCon: Design APIs with purpose, BrusselsPHP: DDD, CQRS, ES, Hexagonal... and the framework, PHPers Summit: Design APIs with purpose, PHPers Summit: JeoPHPardy, 4Developers: Design APIs with purpose, ConFoo: Design APIs with purpose, ConFoo: Refactoring graphite to diamond,
2021	4Developers: Refactoring graphite to diamond, PHPers Online #1: Working with LARGE OpenAPI descriptions,
2020	ConFoo Montreal: DDD, CQRS, ES, Hexagonal... and the framework, ConFoo Montreal: Solving problems using trees,
2019	PHPCon Poland: DDD, CQRS, ES, Hexagonal... and Symfony, PHPCon Poland: JeoPHPardy, PHPers Warsaw #19: Enumerations in PHP, SymfonyLive Warsaw: Symfopardy, SymfonyLive Warsaw: DDD, CQRS, ES, Hexagonal... and Symfony, PHP UK Conference: Dive deep into blockchain,
2018	PHPers Warszawa: JeoPHPardy, PHPCE Praha: JeoPHPardy, PHPers Summit: Symfony without the framework (slides), PHPers Summit: Framework as an implementation detail (Workshop), NomadPHP: Solving problems using trees (slides), PHP Serbia: Dive deep into blockchain (slides), 4Developers: Symfony without a framework (slides), ConFoo Montreal: Supercharge views with shortcodes (slides) (Lightning Talk), ConFoo Montreal: Dive deep into blockchain (slides), ConFoo Montreal: Functional approach in software design (slides),
2017	FlyingAtom Open Days: Blockchain 101, SymfonyCon Cluj: Mastering regex incantations (slides), PHP CE: Dive deep into blockchain (slides), PHPers Summit: Dive deep into blockchain (slides), 4Developers Warsaw: Solving problems using trees (slides),
2016	PHPers Warsaw #12: The art of PHP package design (slides), PHPCon Poland: Functional approach in software design (slides), SymfonyLive London: Tell a story with your (git) repository (slides), PHPers Summit: Functional approach in software design (slides), 4Developers Warsaw: Functional approach in software design (slides),
2015	SymfonyCon Paris: Shortcodes in PHP (Lightning Talk), PHPers Warsaw #9: Vanilla PHP (slides).