Nícolas Iensen
Principal Engineer at tonies®
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolNícolas Iensen is a Principal Engineer based in Berlin with over 15 years of experience delivering production web and mobile applications using evolutionary design, automated testing, and continuous delivery. He has led teams and built high-availability backend systems (notably designing Shopify Forms for global scale) and shipped a React Native B2C mobile app with over 3 million downloads at tonies®, where he also drove dramatic quality improvements in testing, error rates, and device activation success. His background spans founding product-focused shops, mentoring engineers, and running cross-team technical roadmaps—skills honed while guiding door2door through performance, multi-tenancy, and real-time web app initiatives. Nícolas contributes to open-source Ruby/Rails projects (including meaningful fixes to the Coderwall legacy codebase), reflecting a pragmatic full‑stack sensibility. He combines hands‑on implementation with people leadership, measurable reliability gains, and a track record of preparing systems for peak traffic and critical business events. Quietly experimental, he often pairs product-minded engineering with process change—evidenced by introducing Kanban, running hackathons, and improving developer release cadence.
11 years of coding experience
18 years of employment as a software developer
Bachelor's degree, Computer Science, Bachelor's degree, Computer Science at Pontifícia Universidade Católica do Rio Grande do Sul
English, Spanish, German, Portuguese
Stackoverflow
4,109reputation
363kreached
25answers
6questions
windows-subsystem-for-linux
top-5%
material-ui
top-5%
Github Skills (20)
rspec10
rails10
ruby-on-rails10
erb9
material-ui9
schema-design9
db-schema9
database-schema9
schema9
database-design9
html9
windows-subsystem-for-linux9
git7
react6
postgres-fdw6
Programming languages (11)
Github contributions (5)
coderwall/coderwall-legacy
Nov 2014 - Jan 2015
Professional network for software engineers
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:18 commits, 1 PR, 2 comments in 1 month
Contributions summary:Nícolas contributed to the Coderwall-legacy project by adding schema.org markup to the homepage template and modifying route precedence for protips. They also refactored controller tests to improve maintainability and added the "remote" attribute to the opportunity model, alongside related filtering functionalities, demonstrating a focus on improving and expanding the application's features. Furthermore, the user addressed and fixed several badge specification issues. The changes involved modifications to Ruby on Rails code and spec files.
networkprofessionalengineers
nicolasiensen/apod-wallpaper
Mar 2018 - Jun 2018
Contributions:2 releases, 24 commits, 15 pushes in 3 months
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