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Marcin S.

Gdańsk, Poland

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About Me

I am a passionate programmer with over 15 years verified success in developing creative and effective business solutions. With sound knowledge in Git, UNIX, Node.js, and design patterns, my current focus is on Ruby on Rails and JRuby. I am eager to learn new technologies and surround myself with innovative people where we can share ideas and learn from each other. I work well independently or on a team and am committed to developing products that exceed both the clients' and end users' expectations.

Work history

UpStack

Senior RoR Engineer

2018 - Present (7 years)

Remote

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.

Ruby Ruby on Rails Git Ember.js ES6 Java PHP Symfony Framework

YND Consult

Back-end Developer

2018 - 2018

Remote

Maintained and developed new features for Dine+Go (dineandgo.com) mobile application’s back end with Ruby and Elixir.
Kept backward compatibility with the app's earlier version.
Added new features according to schedule.

Ruby Elixir

Freelance

Ruby on Rails Developer

2013 - Present (12 years)

Remote

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.

Ruby on Rails Ember.js HerokuJRuby HAML

Tix.nl

Ruby on Rails Developer

2013 - 2014 (1 year)

Remote

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.

Ruby on Rails RSpec Capybara CoffeeScript Java Integration Testing Scrum Continuous Integration (CI)

Groupe SII

Software Engineer

2012 - 2013 (1 year)

Remote

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.

PHP Redmine Symfony Framework RSpeceCommerce PHPUnit SOAP API

Goldenline

Back-end Developer

2011 - 2012 (1 year)

Warsaw, Poland

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.

Java PHP Ruby Ruby on RailsPHPUnit Selenium Silex MemcachedSphinx Search Engine Performance Optimization

Freelance

Software Developer

2008 - 2011 (3 years)

Remote

Audited and improved the performance and security of various websites.
Designed and developed various CRM applications.
Developed websites with PHP and Rails.

PHP Ruby on Rails Ruby JavaCRM Design

Showcase

Ruby on Rails Developer - Clarus WMS

Implemented a system for processing large amounts of data with sophisticated status flows.
Optimized the time cards of physical workers in warehouses using graph theory and advanced programming techniques.
Implemented a custom login service daemon for FTP Server using Clarus Devise accounts.