Jan Bajena – Medium

Jan Bajena
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.

4 min readNov 25, 2021

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Setting up RSpec and DatabaseCleaner to support multiple databases

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Jan Bajena

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…

4 min readNov 8, 2020

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Hanami: Unobtrusive JavaScript

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Jan Bajena
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…

5 min readOct 28, 2020

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Hanami: Thoughts of a Rails developer

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Jan Bajena

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.

7 min readApr 24, 2020

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

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Jan Bajena
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.

3 min readMar 24, 2020

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

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Jan Bajena

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.

2 min readJan 29, 2020

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Using Ruby Enumerators for streaming big gzipped CSV files from FTP

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Jan Bajena

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!

4 min readOct 27, 2019

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5 reasons why you should start Codewars (now!)

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Jan Bajena

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…

3 min readOct 11, 2019

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Decrease load on your JSON APIs by using sparse fieldsets

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Jan Bajena

Google Apps Scripts — parallel HTTP requests with retries

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

2 min readAug 25, 2019

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Google Apps Scripts — parallel HTTP requests with retries

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Jan Bajena

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.

4 min readJan 9, 2019

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

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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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