Jan Bajena – Medium

Jan Bajena

Published in
Productboard engineering

Setting up RSpec and DatabaseCleaner to support multiple databases

In this post I explain how we introduced a new database to our Rails app and set up RSpec without annoying the whole engineering team.

Nov 25, 2021

Setting up RSpec and DatabaseCleaner to support multiple databases

Nov 25, 2021

Hanami: Unobtrusive JavaScript

In one of my previous posts I wrote down the impressions about Hanami I’ve had while working on my side project, Flashcard Genius. One of…

Nov 8, 2020

Hanami: Unobtrusive JavaScript

Nov 8, 2020

Published in
The Startup

Hanami: Thoughts of a Rails developer

I remember hearing about Hanami framework for the first time. It was a few years ago, during a talk on Wroclove.rb conference. It didn’t…

Oct 28, 2020

Hanami: Thoughts of a Rails developer

Oct 28, 2020

Ruby on C(ocaine) 💉 Intro to C extensions for newbies.

Building C extensions in Ruby isn’t really that hard. Let me show you how I built my first one.

Apr 24, 2020

Ruby on C(ocaine) 💉 Intro to C extensions for newbies.

Apr 24, 2020

Published in
The Startup

Solving “invalid byte sequence in UTF-8” errors in Ruby

Learn what “UTF-8 byte sequences” are, why they can be invalid and how to solve this problem in Ruby.

Mar 24, 2020

Solving “invalid byte sequence in UTF-8” errors in Ruby

Mar 24, 2020

Using Ruby Enumerators for streaming big gzipped CSV files from FTP

Check out how I managed to make use of lazy enumerators to FTP stream, ungzip and process a huge CSV file line by line.

Jan 29, 2020

Using Ruby Enumerators for streaming big gzipped CSV files from FTP

Jan 29, 2020

5 reasons why you should start Codewars (now!)

Check out how codewars.com can help you improve your programming skills and have lots of fun at the same time!

Oct 27, 2019

5 reasons why you should start Codewars (now!)

Oct 27, 2019

Decrease load on your JSON APIs by using sparse fieldsets

In Leadfeeder we develop our frontend app in Ember.js backed by a Ruby on Rails JSON API. Personally I think it’s a great choice of stack…

Oct 11, 2019

Decrease load on your JSON APIs by using sparse fieldsets

Oct 11, 2019

Google Apps Scripts — parallel HTTP requests with retries

Learn how write a retriable UrlFetchApp requests batch in Google Apps Scripts

Aug 25, 2019

Google Apps Scripts — parallel HTTP requests with retries

Aug 25, 2019

Use lazy relationships to eliminate N+1 queries in your Rails apps

Learn how I used batch loading technique to solve N+1 queries problem in Rails apps that use ActiveModel::Serializers gem.

Jan 9, 2019

Use lazy relationships to eliminate N+1 queries in your Rails apps

Jan 9, 2019

Jan Bajena

Jan Bajena

I’m a software developer @ Productboard, mostly interested in building backends using Ruby language. CSS doesn’t make me cry though ;)

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