Marcin is a Senior Software Engineer with 15+ years of verified success in developing creative and effective business solutions using Ruby, Ruby on Rails, JRuby, Git, UNIX, Node.js, and design patterns. He is keen on learning new technologies and working well either in a team or solo, committed to developing products that exceed client and end-user expectations.
Creating and developing innovative software solutions for clients across a broad range of industries.
Participating in scrums consisting of cross-functional teams, both software and hardware.
Ensuring that features are being delivered efficiently and on time.
Managing comprehensive projects for clients across a broad range of industries.
Implemented a system for processing big amounts of items with sophisticated status flows.
Built a JRuby web tool for PayPal's HR managers to create custom PDF documents.
Built Clarus Warehouse Management System from scratch and took it to the point where it was successfully deployed and used by clients.
Led the front- and back-end performance benchmarking and optimization and implemented a fully automated CI process.
Conducted weekly demos for the CEO and actively participated in sprints planning, promoting the company's Scrum philosophy.
Created integration tests with Capybara covering new functionalities and developed a Ruby on Rails application using Java for the back end.
Developed custom Redmine extensions and improved functionalities.
Created a Symfony-based eCommerce project for one of the biggest Polish price comparison sites.
Built an internal SOAP API and tested code with PHPUnit and RSpec.
Implemented new functionalities for the company website including new client profiles, tested with PHPUnit and Selenium, and created an internal API with the Silex framework.
Optimized performance using Memcached, Membase, and the Sphinx Search Server.
Improved core site functionality including a complex candidate search engine for recruiters.
Audited and improved the performance and security of various websites.
Designed and developed various CRM applications.
Developed websites with PHP and Rails.
Implemented a system for processing large amounts of data with sophisticated status flows. Successfully implemented a system to optimize the time cards of physical workers in warehouses using graph theory and advanced programming techniques. Implemented a custom login service daemon for FTP Server that allows Clarus users to log into FTP server and upload files using Clarus’ Devise accounts. Migrated multi-instance application to single instance, multi-tenant architecture using Apartment gem. Techniques used: Graph Theory, Ember.js, Ruby, Ruby on Rails.
Developed BPP University's online system including student profiles, course search, and class registration. Extracted reusable components from the codebase to external gems. Technologies used: Rails, Ember.js.
Migrated Rails 4 monolith architecture to Rails 5 based on a loosely coupled system for Tito, a commercial event software available for B2B utilization.