Kostas Rousis
Chief Technology Officer at samedi GmbH
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolKostas Rousis is a pragmatic technology leader and CTO with 13 years of professional experience and over 20 years of hands-on coding history, who currently leads Product & Engineering at samedi from Berlin. He grew the engineering organization from a tiny team to nearly 50 cross-functional practitioners while guiding the platform through a fourfold expansion and adopting Shape Up-inspired six-week cycles. A strong advocate for psychological safety, concise communication, and high-quality, well-tested code (BDD/TDD), he balances engineering rigor with product pragmatism to avoid over-engineering. His background spans full-stack web development, systems administration, voice-enabled embedded projects, and teaching computer security and cryptography, giving him a rare blend of applied engineering and academic grounding (MPhil Computer Science). He prioritizes privacy-first, security-focused design—championing end-to-end encryption in healthcare SaaS that supports tens of thousands of clinicians and millions of patients. Known for turning messy legacy stacks into maintainable, well-tested systems, he excels at aligning product and engineering around measurable outcomes.
13 years of coding experience
18 years of employment as a software developer
Master of Philosophy (MPhil) Computer Science, Master of Philosophy (MPhil) Computer Science at The University of SheffieldCCNA Cisco Certified Network Associate, CCNA Cisco Certified Network Associate at ACT - American College of Thessaloniki
Stackoverflow
5,968reputation
1.1mreached
106answers
1question
ruby
top-5%
ruby-on-rails
top-5%
debugging
top-5%
activerecord
top-5%
html
top-5%
heroku
top-5%
Github Skills (58)
rubocop10
mvc10
authentication10
rails10
ruby10
mongoid10
transition10
html10
activerecord10
ruby-on-rails10
debugging9
aasm9
devise9
performance-optimization9
state-machine9
Programming languages (10)
Github contributions (5)
samedi/php-booking-api
Jan 2014 - Oct 2016
Contributions:3 commits, 1 PR, 2 pushes in 2 years 9 months
apiphpto-doguidelinebooking-api
rousisk/rails
Feb 2015 - Jan 2016
Contributions:24 pushes, 4 branches, 1 comment in 10 months
ruby-on-railsrailsruby-onruby
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