• spren9er

    Web • Math • iOS

Dr. Torsten Sprenger Mathematician / Software Architect

Web • Math • iOS

I'm a computational mathematician and Rubyist from Germany and CTO of SayWay in Cologne. I like developing sophisticated mathematical algorithms and implementing web applications with Ruby on Rails & iOS apps with RubyMotion. Also I'm enthusiastic about product, graphic & UI/UX design and future technologies & devices.

E-Mail mail[at]spren9er.de
Website www.spren9er.de
Address Mengenicher Str. 33
50829 Köln

my employment

CTO – SayWay GmbH, Cologne

Concept and Implementation of digital feedback system
Development of BI module (Reporting, Online Analytical Processing, Analytics)

Web Development with Ruby on Rails & App Development

2015 - today

Software Architect – Federal Ministry for Economic Affairs and Energy, University of Kassel

Project CloudMath - Numerics and Computer Algebra for Cloud Systems
Conceptional Design and Implementation of a Cloud System delivering Computer Algebra Services

2013 - 2015

Shareholder – metaminded UG, Aalen

Conceptional Design, Implementation and Introduction of an innovative iOS product
Development of numerous iOS apps
Co-Development of major CRM and web project management tool

iOS Development with RubyMotion & Web Development with Ruby on Rails

2010 - 2015

Software Architect – provideal GmbH, Kassel

Misc. Implementations for diverse web applications
Conception and Co-Development of an online ticket shop

Web Development with Ruby on Rails

2007 - 2013

my education

PhD in Computational Mathematics – University of Kassel

Research and Teaching in Computer Algebra
Misc. Implementations of Computer Algebra Algorithms for Maplesoft, Canada
PhD thesis Algorithms for q-holonomic functions and q-hypergeometric series

2005 - 2009

Diploma Degree Mathematics – University of Kassel

Advanced Studies of Mathematics and Computer Science
Emphasis on Computational Mathematics
Diploma thesis Algorithms for multiple summation

2002 - 2005

Pre-Degree Mathematics – University of Kassel

Basic Studies of Mathematics and Computer Science

1998 - 2002

home |hōm|

a place thought of as home (; specif.,)
a place where one likes to be; restful or congenial place

operating systems

Mac OS X, iOSUNIX/Linux

version control

Git, GitHubGitLab

communication & project management

Slack, TrelloBasecamp


ATOM, Sublime Textvim, XCode

my skills and expertise

Here is an overview of my main professional skills

programming skills

ruby / rails / rubymotion
html / css / javascript
r / mathematica / maple / bi tools
objective c / swift

miscellaneous it skills

databases / mongodb / citusdb / postgresql
network / server / docker / continuous deployment
mac os x / unix / linux
photoshop / pixelmator

language skills

  • german

  • english

  • french

my portfolio

coming soon...