Profile PictureSébastien Castiel

Do you like personal finance *and* programming?

Hey there!

Just a quick post to tell you I’m starting to write a new book!

Are you interested in Personal Finance? Do you like knowing at each time what you own and what you owe? Or is it something you would like?

With this new book, I’ll help you build your own Net Worth tracker using Kotlin! We will use this fantastic language (if you don’t know it yet, don’t worry!) to create a tailor-made solution to track your accounts, investments, mortgages, debts, etc. so you know precisely how close you are to achieving your financial goals!

Here are some things you would learn with the book:

  • Create the right data model using Kotlin’s expressivity to handle your accounts, their specificities, and their value over time.

  • Present the evolution of your personal finances in pretty ways, in the console, and in a web page.

  • Call useful APIs to convert currencies and get stock values to avoid as much manual process as possible.

If you are interested, here is a gift for you: the pre-order price is $9.99, but by following this link, you can pre-order it with an additional $5 discount, meaning you’ll get the book for only $4.99!

Pre-order now with a $5 discount

Feel free to contact me at if you have any questions!

Have a great day,


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