Bartosz Szarłowicz

Fullstack Ruby on Rails developer

Preview CV

ActiveNow

Fullstack Ruby on Rails Developer · Dec 2025 – Present

11 months and counting

activenow.io

Smartshack

Fullstack Ruby on Rails Developer · Oct 2023 – Dec 2025

2 years 3 months

smartshack.pl

Smartshack

Fullstack Ruby on Rails Intern · Aug 2023 – Sep 2023

2 months

smartshack.pl

Computer Science

Cracow University of Technology · Mar 2025 – Jun 2026

Major in Cybersecurity

Computer Science

Cracow University of Technology · Sep 2021 – Jan 2025

Computer Engineering

InterfaceHotwire · Stimulus · ViewComponent · Slim · Tailwind CSS
ApplicationRuby on Rails · Authorization (RBAC) · Multi-tenancy
BackgroundSidekiq · Active Storage
DataPostgreSQL · MySQL
IntegrationsTpay · PayU · Stripe · Fakturownia · Callback24 · Calendly
Safety netRSpec · Cypress · Factories
Ship itGit · GitHub · Docker · Heroku · Claude Code

$ rspec bartosz_spec.rb

Bartosz

✓ships large features end to end

✓migrates schemas with zero downtime

✓moves legacy UI to a new stack

✓fixes security issues on live projects

✓keeps data consistent under load

✓builds reusable design systems

✓resolves production issues fast

✓runs projects directly with clients

8 examples, 0 failures

Bartosz on a couch with a controller, watching TV

“Thank you very much for creating a professional email signature for my company and for your support in building my website. If anyone is starting a new business or would like to update their website, email signature, or applications, I highly recommend Bartek. He has a very client-oriented approach and completes every task with great precision and care.”

Michael Lysokon · Mac4Less · Client · May 2026

★★★★★

“Working with him at university has been an absolute pleasure. He is a highly motivated, reliable, and hardworking individual who always brings great energy to the team. He possesses excellent communication skills and a unique ability to solve problems under pressure. Any team would be lucky to have him!”

Marek Kurańda · University Colleague · May 2026

★★★★★

“Bartek is a great colleague to work with. I value his professionalism and accuracy, pair-programming, consultations, and constructive feedback most in our collaboration. And we've been working on numerous projects together for over two years.”

Michał Sieradzki · Coworker · Feb 2026

★★★★★

“I've worked with Bartosz on several projects, and it's always been a pleasure. He's skilled, professional, and brings a positive attitude to his work. Collaborating with him is straightforward and enjoyable. I'd highly recommend working with him!”

Rafał Przybysz · Friend · Dec 2025

★★★★★

“I have worked with Bartosz on many projects, and he has always been a great help. When I was new and didn’t know what to do, he patiently taught me and guided me through the tasks. He has a lot of knowledge and can handle several things at once without any trouble. He is very competent and stays calm even in busy situations. Bartosz is a reliable and skilled colleague who makes working together easier and more enjoyable. I am glad to have him on the team and appreciate all his support.”

Bartek Sosnowicz · Coworker · Dec 2025

★★★★★

“I've had the pleasure of studying and working alongside Bartosz, and I can honestly say that collaborating with him is always a great experience. He is professional, reliable, and brings a positive energy to every project :)”

Maciek Walczak · Coworker · Nov 2025

★★★★★

Have we worked together?

3 years 3 months as a developer