Skip to content
You must be logged in to sponsor johnjohndoe

Become a sponsor to Tobias Preuss

@johnjohndoe

Tobias Preuss

johnjohndoe
Berlin, Germany

Hello friend.

I love open source. I am doing open source since I started professional software development in 2009. That is why I invest a lot of my free time in working on favorite projects of mine such as EventFahrplan, Umweltzone and Wo ist Markt?. Since April 2016 I am working part-time to have one unpaid day per week and weekends to maintain, manage and further develop these projects. Many other projects of mine or projects which I contribute to can be found in the repositories list of my GitHub profile.

I would like to keep my engagement up and running but as everyone I am constrained by the amount of free time and paying my bills. If you decide to sponsor me then you are supporting me as a person and so the projects which I decide to work on. Every sponsoring amount will help me to avoid doing contract work instead.

If you need any other information regarding my projects or the sponsoring please do not hesitate to contact me.

Thank you.
Cheers, Tobias

A chosen few

@johnjohndoe

Let's see if there are 10 people out there who like to sponsor my work on projects like EventFahrplan.

Current sponsors 3

@neelance
@cketti
@SubOptimal

Past sponsors 8

@ligi
@indeedeng
@torantal
@joergi
@anisagiantess
@erk971
@ideadapt
@Dickmaulruessler

Featured work

  1. Umweltzone/Umweltzone

    Low emission zones and Diesel prohibitions zones on Android

    Java 19
  2. EventFahrplan/EventFahrplan

    An Android app to enjoy event schedules powered by Frab, Pretalx or Wafer.

    Kotlin 204
  3. johnjohndoe/engelsystem

    A Kotlin library containing a parser and models for the Engelsystem.

    Kotlin 7
  4. johnjohndoe/c3media-base

    A Kotlin library for the media API of the CCC.

    Kotlin 3
  5. johnjohndoe/HalfnarpClient

    A Java library containing a parser and models for the Halfnarp API.

    Java 4
  6. wo-ist-markt/wo-ist-markt.github.io

    A map visualization of periodic markets in different cities.

    JavaScript 83

Learn more about sponsoring developers and organizations.

Report abuse

30% towards 10 monthly sponsors goal

@cketti @neelance
@SubOptimal

cketti and 2 others sponsor this goal

Select a tier

$ a month

Choose a custom amount.

$1 a month

Select

🍵 You've always wanted to support an open source developer. Pay for a warm drink which keeps me going.

$5 a month

Select

🌮 You seem to really like my open source work. This will pay for a snack feeding me while developing.

$25 a month

Select

📚 You want to support me by paying for licenses, books and online courses.

$250 a month

Select

💻 You're probably using an open source project of mine commercially and can afford to be generous. Send me to a tech conference, upgrade my hardware or cover server costs.

$1,000 a month

Select

🏢 You are an organisation or company with a product based on one of my open source projects or you are running a conference where you provide the conference app which I develop in my unpaid free time.