Johann Jacobsohn

We use the Slack-alternative Mattermost as a shared repository for scientific research papers in our workgroup, so I decided to write a TUI (Text User Interface) to retrieve and display that data, as well as augment it with additional resources. Available for use from the Python Packaging Index (pip).

A simple platform to create, view, share and giving social distant talks. Also an experiment to create websocket-like features with simple REST and SWR. And another pretends to play with NextJS and Typescript. Set aside for the moment, and probably forever.

I got tired of synchronizing three browser tabs to see Slask convos, redmine tickets and associated bitbucket pull requests, so I build an app to show all three in one unified, synchronized custom view. It interfaces with the REST apis of all three services (ticket, code review, chat) simultaneously and is guaranteed to be up-to-date per SWR. Features both server- and client-side rendering and improved styling. Also my first venture in the fascinating world of serverless architectures.

During the "JUNOSOL - Jupyter-notebooks for self-organized learning" project I trained students, produced screencasts and wrote documents on code, including tipps on how to write good code and tipps howto write good code reviews in the context of scientific Jupyter notebooks.

A fun little project to write a git command to sync redmine tickets to gitlab or bitbucket pullrequests and make working with a git flow model a tiny bit easier. git-fix interfaces with the REST Apis of redmine, gitlab and bitbucket to automatically create and populate a pull request from a redmine ticket. Credentials are stored in the git config infrastructure, a pretty neat approach I've reused in other projects.

A long standing large hardware/software system to coordinate different sensors for scientific UV imaging entirely written in C. Interfaces with cameras, spectrometers, motors and thermo sensors. Embeded in a larger ecosystem of different hardware and software projects. Deployed on multiple field campaings on different volcanoes.

Since the university doesn't believe in air conditioning I've build a small app in the summer of 2016 that continuously monitored my office's room temperature and tried to predict whether I am still alive - or not. I used an Espruino (a kind of Javascript bases Arduino) that send temperature date from an attached thermoprobe to my desk PC, which created a static Dropbox webpage. The project died when Dropbox discontinued that service.

I needed a small programm to monitor systemd processes and display a tray indicator icon, so I wrote one. My first deep dive into dBus and QT5.

I needed a (cheap) stepper motor controller assembly that manages stepper motors with both a manual switch as well from a serial interface and also monitors end breaker sensors. My first electrical engineering project to containing both the Arduino firmware as well as the CAD electronic hardware.

A fun project for everyone dealing with paper tally lists. A neat touch tally app synchronizes and updates itself and is installable on iOS and with Firefox. A simple backend administration interface allows to manage users, beverages and prices, balance accounts. Everything is real-time synchronized thanks to a websocket server.

One of my biggest solo-projects so far. An App to display, filter and organize the weekly and daily mensa menu at the hamburg university (and some other local universities). Not just one App, but a baker's dozent. Variants existed for Palm/HP Mojo, Enyo, Android Tablet (back on Android 3), Android Phone (Android 2+), iPhone, iPad, Blackberry Playbook, Nokia N40, Win7 Phone, FirefoxOS, Chrome Webstore, and even as a Win7 Web Slice. At its peak, it had thousands of active installations from different app stores and even a small community. Written in JS/CSS in a multitude of frameworks with a NodeJS Backend Service.

EnyoJS is a framework for building native-quality HTML5 apps that run everywhere and bbui.js is a BlackBerry UI look and feel JavaScript toolkit for WebWorks. Enyo-BBUI aims to bridge these two to create native-quality HTML5 Apps on Blackberry 10 devices and was featured on the official Enyo-Blog.

A Quine is a program that renders its own source code. Back in 2008 I discovered that I could write a "Source"-CSS and even an HTML-Quine. I probably wasn't the first one to discover this, but I still like to think I was, I even wrote a blog post about it.