Dennis Schön

Senior Software Engineer

Summary
  • Over 15 Years experience in developing high-performance web applications.
  • Extensive knowledge in scaling and optimizing a business networking site to handle over 15 million users that generate 25 million dynamic page impressions per day.
  • Experience in leading engineering teams.
Experience
Senior Software Engineer
Jan 2013 - Present
Freelance, Greater Hamburg area and remote

Tasks included bootstrapping new web applications, maintaining legacy apps and APIs, designing microservice infrastucture and startup tech consulting.
Technologies used: Go, Ruby on Rails, Python, Docker, Consul, MySQL, Elasticsearch, Graylog, ...

Senior Software Engineer
Jan 2019 - Feb 2020
Twenty Billion Neurons GmbH, Berlin (remote)

Full ownership of a web platform that collects large amounts of video data used to train neural networks.
Technologies used: Go, Ruby on Rails, Postgres, AWS, Terraform, Ansible.

Senior Software Engineer
Sep 2017 - Jul 2018
Greenlight Software GmbH, Lippstadt (remote)

Full ownership of a web platform that enables clients to run online training courses for their staff.
Technologies used: Ruby on Rails, MySQL, Grafana, InfluxDB.

Chief Technology Officer
Mar 2011 - Sep 2012
loftville GmbH, Hamburg

Responsible for 5 Team Members (Frontend, Backend, Design). Tasks included leading the development of the website, building and maintaining the tech infrastructure, hiring and retention of talent, conflict management and budget planning.
Technologies used: Ruby on Rails, HAProxy, Nginx, unicorn, MySQL, Sphinx.

Principal Software Architect
Feb 2009 - Feb 2011
XING AG, Hamburg

Worked on the XING core architecture. Responsibilities included architecture, site performance, analyzing and solving problems in a complex multi-server (N > 300) environment, code quality assurance, automated testing and Release Management.
Technology stack consisted of: Ruby, Rails, Perl, MySQL, Redis, RabbitMQ and XING-internal REST APIs.

Software Engineer
Aug 2006 - Jan 2009
epublica GmbH, Hamburg

Worked on the product for our largest client, XING. Restructured the codebase to form a more Service Oriented Architecture; integrated asynchronous and parallel processing with Gearman; developed techniques for database schema changes on tables with 10s of millions of records without downtime; Responsible for the concept and integration of 3 acquired social networks (econozco, Neurona, cember.net) with a total of over 1.7 million users.

COURSES & TRAINING
Gesprächsführung für Menschen in Schnittstellenpositionen
2010
oose Innovative Informatik eG, Hamburg
RedHat Certified Engineer
2002
RedHat Europe
Language Skills
German: First language
English: Fluent
Spanish: Elementary