Chlebičov near Opava, Moravian-Silesian Region, Czech Republic
Freelance developer. Ruby on Rails.
I have been building websites and applications for 20+ years. Today I build ProPlav, software for swimming schools, and develop shopVOX, an American SaaS for sign and print shops.
I have been building websites and applications since 2006. Today in Ruby on Rails.
I am Ing. Štefan Bartoš, a freelance developer (sole trader). I graduated in computer science from VŠB – Technical University of Ostrava, and I am originally from the Kysuce region of Slovakia. I live and work in Chlebičov near Opava, Czech Republic.
I am the founder, operator and sole developer of ProPlav.
Information board
Software for swimming schools and school swimming programmes.
I design, code, operate and support it myself.
www.proplav.comRuby on Rails development for an American SaaS for managing jobs at sign and print shops. Freelance, for Techvox Inc.
shopvox.comRuby on Rails, Hotwire, PostgreSQL. From process analysis through code to running it in production.
“AI is a tool, not a replacement for the craft.”
Claude Code and multi-agent workflows: specification, implementation, independent review, browser testing. AI speeds things up, but I am accountable for the result. Tests, review and browser checks are mandatory.
AI agents update the help pages with every release, including screenshots. An agent analyses a production error and prepares a fix, which I review and approve.
I am building an MCP server (Model Context Protocol) with OAuth 2.1 that will let AI assistants such as Claude or ChatGPT connect securely to a SaaS application’s data.
Route map 2005 → today
20+years of web
and app
developmentsince 2006
I studied computer science at VŠB – Technical University of Ostrava and graduated in 2011 with an Ing. (master’s) degree. Before that, I attended a secondary technical school (SPŠ), majoring in mechatronics, in Kysucké Nové Mesto (2001–2005).
My first commissioned websites, built while I was still studying at VŠB.
My own brand in Ostrava: websites, online shops, web design, online marketing, custom CMS, integrations.
Ing. in Computer Science (VŠB-TUO). Trade licence and Company ID (IČO) since 13 January 2011.
RAYNET s.r.o., Ostrava. Outsourcing: websites for RAYNET’s clients, including Fajn Catering and SOŠ Waldorfská.
I switch to Ruby on Rails and work freelance: projects for partners.
creox, remote. Ruby on Rails for clients abroad.
Benloop, Ostrava. Ruby on Rails 3 → 4 upgrade, API, Solr, AWS, Dropbox API. Projects include Lastrona (a home care agency) and Benztown Branding (an American library of radio jingles).
Enrian Partners, remote. Ruby on Rails. Enrian delivered projects for banks. I worked on projects for UniCredit Bank — business loans.
I develop an American SaaS for sign, print and wrap shops on a long-term basis. Ruby on Rails, freelance, for Techvox Inc. Part-time at first.
I start writing ProPlav for my wife’s swimming school.
In production, fully digital.
Software for swimming schools and school swimming programmes. Registrations, courses, attendance, make-up lessons, invoicing, parent portal, certificates and shift planning. I design, code, operate and support it myself.
“Thousands of children checked in. Just one piece of paper — the sign-in sheet, on purpose.” from the ProPlav storywww.proplav.com
Ruby on Rails · remote
Business loans.
I worked on projects for UniCredit Bank: Ruby on Rails applications. Enrian Partners delivered projects for banks, and I worked for them remotely.
An American SaaS for sign and print shops. Ruby on Rails, freelance, for Techvox Inc.
shopvox.comAn American library of radio jingles and a home care agency. Ruby on Rails 3 → 4 upgrade, API, Solr, AWS, Dropbox API.
04/2013Arcabox s.r.o.
Wholesale online shop for plastic crates and pallets: multi-level quantity discounts, weight-based shipping, two-way synchronisation of products, stock and orders with the Pohoda accounting system, and a custom quotation module for businesses.
03/2011Radek Pokora
Motorcycle accessories: stock tracked by piece count, statistics on sales, profit and turnover, newsletters and Facebook API integration.
08/2009 · redesign 08/2013Ing. Jozef Chlebek
Online shop of a Slovak streetwear brand: size variants and a module that calculates commissions for registered artists on the T-shirts sold.
06/2012DT Logistic CZ s.r.o.
Website of a transport company in three languages (CZ/EN/DE) on a custom content management system.
06/2012Bilingual company website on a custom CMS.
06/2013Company website of an engineering works with a two-level production catalogue.
03/2013Showcase website, from analysis and graphic design through to adding the content.
Other XO Studio clients: RAYNET s.r.o. (subcontracting), The Candy Plus Sweet Factory (PEDRO, Ňami ňami), Travelco, Fajn Catering, SOŠ Waldorfská Ostrava, Industrial Café.
Ticket · billing details
Ing. Štefan Bartoš Větrná 312 747 31 Chlebičov Czech Republic Company ID (IČO): 87533936 VAT ID: CZ8608297907 (VAT registered) Bank account (EUR): 2502909408/2010 (Fio banka) IBAN: CZ87 2010 0000 0025 0290 9408 BIC/SWIFT: FIOBCZPPXXX Sole trader registered in the Czech Trade Licensing Register.