Welcome to my Website! // About Maxr1998

Hey there! I'm Max Rumpf, a 19-year old student & hobbyist Android developer acting under the pseudonyme Maxr1998. I am Recognized Developer and Contributor on
In my free-time, I create apps and mods for powerusers, like MaxLock, an applocker, or HassDroid, a client for the Home Assistant home automation platform. View a list of my projects here.
I'm also active on various other sites, check out the links below (if not blocked by your ad-block). You can contact me via Telegram, as specified below.

My stuff

Hardware & Software I use, like and can recommend:

  • Dell XPS 13 9360, i7-7560U, 16GB of RAM (powerful, extremely good-looking device, with an insanely good screen and battery life)
  • Arch Linux, on the above laptop
  • i3wm, a fast and powerful window manager once you learn it - Link to my current config
  • fish (much smarter auto-completion than bash, and a lot of cool additional features, but scripting in it is kinda weird)
  • Vim, link to my config (I never thought I'd actually use this one day. I don't even now recommend anyone to use it, if you don't want to spend more than 20 mins learning and configuring a FILE EDITOR, but damn, if you do, it's FAST)



  • German: natively
  • English: very well (Camebridge English: Advanced certificate, CEFR level C1)
  • French: ok (DELF certificate, CEFR level B1)

Programming languages/technologies (now to the fun part)

  • Android/Java***, Kotlin**, XML**
  • Linux***, shell scripting**, Linux server management**
  • C/C++** (learning in University)
  • HTML**, dust.js**, JavaScript*, Node*
  • Haskell*, Fortran*
  • Lua*
  • Docker*
  • JIRA/Confluence*

***: Proficient
**: Intermediate
*: First experiences


MaxLock is an Xposed module to protect your apps with a lockscreen.


Xposed mod that customizes the look and feel of the Google Play Music application and adds a few extra tweaks.


Xposed mod that adds a track selector to MediaStyle and other music notifications on Android 5.0 which either support its custom API or the official MediaSession API with queue and controls. Currently supported are Google Play Music and Timber.

Android app for Home Assistant

Native Android user interface for the Home Assistant home automation software.
Currently unofficial, until the project gains enough traction and proofs commitment.


Android app and linux-pam module which allows you to unlock your PC with your phone's fingerprint reader, using a challenge response verification system with an ECDSA keypair, and Google Firebase Realtime-databases for message transfer.
hellsCode is a kernel and system mod that enables unlocking via knock code on the LG Nexus 4


Android N-ify

Xposed mod that backports features from Android Nougat to Android Lollipop and Marshmallow!

Contributions: Direct reply, Google Assistant, Partial screenshot, bugfixes, build server and issue management

Main authors: MrWasdennnoch and paphonb

Always On AMOLED

App which makes your device show the time & more when the screen is "off", just like the Galaxy S7!

Contributions: Pocket mode, bug fixes, etc.

Main author: Tomer Rosenfeld


I also helped translating quite a few third-party apps to German, here are all I remember:

  • Always On AMOLED
  • Android N-ify
  • hellsCore Kernel Manager
  • MultiROM Manager
  • XDA-Labs