About Sebastian Felix Zappe

Profession

I'm CTO at Sozialhelden e.V. in Berlin / Germany, and freelancer (You can hire me.)

Experience: More than 20 years commercial software development, programming since the age of 8.

Languages: German (native), English (business-fluent), Icelandic (en bara smá).

Agile team and project management (with in-house and remote teams)
Tech evangelism
Software QA - BDD, TDD, cloud test platforms, building full CI/CD systems from scratch, good documentation & unit-tested high-quality code
Open Source maintenance
Various SQL and NoSQL databases
Performance optimization & profiling
GIS, location-based services
Real-world and software accessibility (WAI)
Contributing to tech standards (W3C LDA, A11yJSON, GTFS)
Data mining, web scraping
Complex data visualizations
Making tangible things: rapid prototypes with 3D printing (SLA/FDM), computer-aided machining (CNC/CAM), Autodesk Fusion 360, soldering, signal analysis
Animated 3D graphics (Cinema 4D, OpenGL)
IoT, electrical engineering, sensors & digital signal processing, RFID, Bluetooth, Particle Cloud
Figma, Sketch, Photoshop, Illustrator, Cinema 4D, Autodesk Fusion 360
Online banking
Online / Mobile advertising
Social network analysis
MIDI, OSC, DMX, VR, live events, real-time scene control

In the recent past, I have actively worked with:

Kubernetes / DevOps. Prometheus, ElasticSearch, Grafana, Argo Workflows, Argo CD, nginx
JavaScript / ECMAScript / TypeScript on client and server, ES6+, Node, Meteor, React, Cordova, Backbone, d3, Three.js, Mapbox
Objective-C++ / Swift on iOS / macOS, Xcode, Cocoa (Touch), complex UIKit apps, CoreAnimation. Earlier: CoreData, Bonjour, Distributed Objects
Java / Kotlin on Android
C / C++, Visual Studio Code, Xcode, Eclipse, Visual C++, KDevelop, MacOS X / Cocoa, boost, OpenGL, TCP/IP

I'm not actively using these things anymore, but have used: