Christian Dewein
Chief Technology Officer at ioki
Frankfurt, Hesse, Germany
Summary
👤
Senior🎓
Top SchoolChristian Dewein is a seasoned technology leader and CTO with 16 years of experience building and scaling web platforms, currently shaping demand-responsive mobility products at ioki (Deutsche Bahn). He combines deep hands-on expertise in JavaScript, Ruby on Rails, PostgreSQL (notably geospatial), and backend systems with a decade of people leadership—running engineering orgs of 50–60 across backend, mobile, BI, UX and autonomous driving. Known for shipping the first production DRT platform in months while keeping technical debt low, he brings product-minded engineering, strong technical strategy, and mentoring for engineering managers. An active community member and OSS contributor, his backend work spans projects like the Coherence authentication system for Phoenix, reflecting a pragmatic focus on security and maintainability. Based in Frankfurt, he also teaches agile software development from the management perspective, blending academic, technical and operational viewpoints.
16 years of coding experience
19 years of employment as a software developer
Master of Arts (M.A.), Media Direction, Master of Arts (M.A.), Media Direction at Darmstadt University of Applied Sciences
English, German
Github Skills (9)
user-authentication10
authentication10
ecto10
elixir10
hex9
shex9
database-migration8
database-migrations8
package8
Programming languages (13)
Github contributions (5)
smpallen99/coherence
Feb 2017 - Feb 2017
Coherence is a full featured, configurable authentication system for Phoenix
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 commits, 3 PRs, 15 comments in 19 days
Contributions summary:Christian contributed to the Coherence authentication system, primarily focusing on its backend implementation. Their work involved refactoring code for improved style, supporting binary IDs for migrations, and enhancing password reset functionality. They made changes to the schema, controllers, and templates within the Elixir/Phoenix framework to ensure correct behavior and prevent security vulnerabilities. Additionally, they implemented changes that improved consistency and maintainability within the project.
hexfull-featuredcoherencephoenix-frameworkauthentication-system
fabrik42/traffic-light-server-elixir
May 2020 - Jan 2023
Configure traffic lights on Heroku, powered by Elixir and Phoenix
Contributions:87 commits, 24 PRs, 50 pushes in 2 years 9 months
herokulightselixirconfigurephoenix
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