My Freelancer Profile

Senior Software Engineer, App & Full Stack, Architect & CTO

As a freelancer and IT consultant, I specialize in app development, web, chatbots and natural language processing (NLP) as well as virtual CTO ("Rent-a-CTO") services. As a professional, my passion is to help CEOs, teams and companies build products that boast great usability, robustness and scalability.

App & Web Development

  • Android (Java, Kotlin) ⭐️

  • Ionic, Capacitor, Cordova ⭐️

  • Angular ⭐️

  • iOS (Objective-C, Swift) ⭐️

  • fastlane.tools

  • App Stores (Play Store / Apple App Store)

  • PWA, SPA

  • TypeScript, JavaScript

  • Angular Material, Bootstrap, Flexbox, CSS, jQuery

  • WordPress, PHP

  • Google Analytics, Firebase App Analytics

  • Grails, Groovy

Architecture / PM / leadership

  • GitLab / GitHub / JIRA ⭐️

  • Konzeption & UX (z.B. mit Balsamiq) ⭐️

  • Projektmanagement ⭐️

  • Team Lead ⭐️

  • Agile / Scrum

Chatbots / NLP

  • NLP (Dialogflow, Wit.ai, spaCy) ⭐️

  • Facebook Messenger Platform

Backend / Database / Cloud

  • Node.js, Express, NPM ⭐️

  • MongoDB (NoSQL), Mongoose, Atlas ⭐️

  • Firebase / Parse ⭐️

  • AWS, GCP, Digital Ocean, Hetzner ⭐️

  • MySQL / PostgreSQL / SQLite (relational databases)

  • Redis

  • Docker

  • Linux, Ubuntu, Debian

  • Apache, nginx, Tomcat

  • Domains, DNS, network

Miscellaneous

  • Online + app payment integration (PayPal, paysafecard, Recurly)

  • Crypto trading know-how (Binance API)

  • Techn. SEO know-how

  • Adobe Photoshop / Affinity Photo

  • NAS, Synology DiskStation administration

  • Unit Tests, JUnit

  • Continuous Integration (CI)

  • Load Testing, k6, JMeter

  • RxJS, AngularJS, NodeJS

  • Figma, Sketch

Local Availability

On-site: Vienna, Austria

Remote: Austria - Germany - Switzerland (DACH), USA, UK, worldwide

As a freelancer, I bring over 15 years of experience in app and web development to your project.

Klemens

Further information such as hourly rate/daily rate and availability as well as contact options for a non-binding introductory meeting can be found under Contact or on the website of creative workline GmbH, my company for app development, freelancers and IT consulting in Vienna, Austria.