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Founder / Owner
Gotar
Apr 2011 – ongoing Gdynia, Poland / Remote- Founder and owner of Gotar, a one-man Ruby/Elixir consultancy specializing in web development
- Developed numerous web applications and systems for clients worldwide
- Serving as business consultant for Rebased Software House
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Senior Software Developer
Impactpool
Sep 2021 – ongoing Remote- Helping Impactpool with software development and building/leading the tech team. Impactpool is a Ruby on Rails 8 platform connecting humanitarian employers with qualified talent, featuring job matching, talent pools, analytics, and integrations with BigQuery and external APIs.
- Utilized modern Rails tools including Hotwire (Turbo and Stimulus) for dynamic interfaces, ViewComponents for reusable UI elements, and Stimulus controllers for enhanced interactivity.
- Integrated advanced technologies such as Puppeteer for web scraping, Dry-rb for business logic, and Sequel ORM for database management.
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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 grow
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Co-owner
Ragnarson
Jul 2014 – Oct 2016 Sopot, Poland / Remote- Established Tricity office branch
- Contributed to company growth from 10+ to 30+ developers
- Hired and trained new developers, including over 100 interns
- Supported clients as Project Manager and Account Manager
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Senior Ruby Developer
Ragnarson
Apr 2011 – Jun 2016 Sopot, Poland / Remote- Getmii – Geo-based instant messaging backend system (API for mobile iOS and Android apps) (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 management(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)
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Web developer, DevOps
Renault Trucks (Bernard Trucks)
Aug 2006 – Sep 2010 Gdynia, Poland- Built and managed Linux-based servers
- Built company website using PHP and SQL
- Built internal software using PHP and SQL
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Web developer, DevOps
ITM Centrum Komputerowe
Apr 2006 – Jul 2006 Gdańsk, Poland- Built company website using PHP and SQL
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Lecturer
ITM Centrum Komputerowe
Dec 2005 – Jul 2006 Gdańsk, Poland- Lecturer on professional courses including Linux System Administration, Flash (ActionScript), Photoshop, and PHP
Oskar Szrajer
Ruby Programmer & Web Developer
- [email protected]
- +48 608-019-078
- Gdynia, Poland
Experience
Volunteer Experience
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Open Source Contributor
Various projects (details on GitHub)
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Speaker
TRUG, Wrocław.rb
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Lecturer
University of Gdańsk (Ruby, Elixir)
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Mentor
Rails Girls Łodź & Tricity
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Founder
TRUG – Tricity Ruby User Group
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Judge
Ruby Rampage