Johannes Mentz

Software Engineer

XING•  November 2015 - Present

At XING, I joined the team, that is developing the groups section of xing.com. After half a year, my team was given a new task, the further development and optimization of the XING AdManager.

Senior Ruby on Rails Developer

trecker.com•  April 2015 - October 2015

I was in charge of the conception, maintenance and further development of the backend part of trecker.com (a farm management application) in Ruby on Rails. I onboarded, guided and mentored two junior developers and ensured the quality of their work. I did job interviews with potential candidates, both backend and frontend, and evaluated their technical skills. I was responsible to set standards for the overall code quality of trecker.com, for fast response times, the deployment processes and the availability of the backend.

Full-Stack Developer

Modomoto•  July 2013 - April 2015

My first task was to relaunch modomoto.de in three months. I used Rails 4 and added credit card payment functionality, two kinds of solvency scoring (Schufa and Bürgel) and data synchronisation with a CRM). After that, i wrote several more Rails 4 applications for MODOMOTO, including - a comprehensive voucher microservice, that can process absolute, percentual and gift vouchers in any combination and redeem them in the most beneficial way for the customer, - a call center software, that helps the MODOMOTO call agents to call existing customers more efficiently, - an image capturing application, that is used in the goods inward department to take photos of new goods by scanning barcodes (ported from node.js). I rewrote several existing Rails 3 applications using Rails 4 in better code quality and with more functionality. I was responsible for the maintenance and extension of a payment microservice, that handles credit card transactions, bank and paypal transfers.

Technische Universität Berlin

Electrical Engineering, none•  September 2005 - January 2007

dropped out