Oskar Szrajer

Ruby programmer & Web developer

Experience

  • Founder / Owner

    Gotar

    Apr 2011 – ongoing Gdynia, Poland / Remote
    • Founder of a one-man Ruby/Elixir consultancy
    • Build many various project for clients from all over the world
    • Working as a company adviser for Rebased - Software House (Business Consultant)

  • Senior Software Developer

    Impactpool

    Sep 2021 – ongoing Remote
    • Helping Impactpool with a software and building/leading tech team.

  • Senior Backend Developer

    Belighted

    Oct 2018 – Aug 2021 Remote
    • Hannah Online – backend for financial forecasting app (Rails, Ruby, Dry-rb, RSpec, PostgreSQL, GraphQL)
    • AXS – backend for car sharing platform (Rails, Ruby, Dry-rb, RSpec, PostgreSQL, External APIs, SOAP)
    • Admeet – backend for GDPR generator (ROM, Roda, Ruby, Dry-rb, RSpec, PostgreSQL, GraphQL)
    • Helping company to growth

  • Co-owner

    Ragnarson

    Jul 2014 – Oct 2016 Sopot, Poland / Remote
    • Build 3city office branch
    • Help with growing from 10+ to 30+ devs
    • Hire & train new developers (more than a 100 interns trained)
    • Support clients as a PM & AM

  • Senior Ruby Developer

    Ragnarson

    Apr 2011 – Jun 2016 Sopot, Poland / Remote
    • Getmii – Geo based IM backend system (API for mobile iOS and Android App) (ROM, Roda, Ruby, Dry-rb, RSpec, Postgres, ElasticSearch, REST API)
    • Masii – Credit Cards & Insurances comparison platform (ROM, Roda, Ruby, Dry-rb, RSpec, Postgres, REST API)
    • Locafox – Geo location price comparison platform (Ruby, Roda, PostgreSQL, ElasticSearch, RSpec, REST API)
    • MaMyMo – high-performance backend system supporting Google Ads platform managing(JRuby, Threads, Sinatra, PostgreSQL, Redis, RSpec)
    • Teon – Car manuals (Ruby, Rails, ActiveAdmin, MongoDB, RSpec)
    • Tripsta (TravelPlanet) – high-performance support systems (>3000 req/s) (Ruby, Goliath, Sinatra, Redis, RSpec)
    • Bellegs – Spree based e-commerce platform (Spree, Rails, RSpec, PostgreSQL)

  • Web developer, DevOps

    Renault Trucks (Bernard Trucks)

    Aug 2006 – Sep 2010 Gdynia, Poland
    • Build and manage Linux based server
    • Build company website (PHP, SQL)
    • Build internal software (PHP, SQL)

  • Web developer, DevOps

    ITM Centrum Komputerowe

    Apr 2006 – Jul 2006 Gdańsk, Poland
    • Build company website (PHP, SQL)

  • Lecturer

    ITM Centrum Komputerowe

    Dec 2005 – Jul 2006 Gdańsk, Poland
    • Lecturer on various professional courses: Linux System Adminstrator, Flash (Action Script), Photoshop, PHP

Voluntreer Experience

  • Open Source Contributor

    Various projects (details on GitHub)

  • Speaker

    TRUG, Wroclove.rb

  • Lecturer

    University of Gdańsk (Ruby, Elixir)

  • Mentor

    Rails Girls Łodź & Tricity

  • Founder

    TRUG – Tricity Ruby User Group

  • Judge

    Ruby Rampage