Independent technical consultant

1/2019 – 12/2021

- Design and development of software systems for:
  + delivery time prediction of customer shopping carts
  + optimal steering of customer orders to the Zalando logistics network
  + orchestration of customer order fulfillment through Zalando and partner warehouses
  + movement of stock between warehouses for operational purposes
- Collaboration with stakeholders to deliver new features in a complex environment
- Operation and optimization of business-critical, distributed systems in the cloud.

[spring boot, openapi, gradle, kotlin, java, intellij, junit, mockito, cucumber, zuchini, kubernetes, docker, aws, postgresql, elasticsearch, redis, kafka, bpm, camunda, github, ci/cd, jenkins, python, jupyterlab, presto, opentracing, lightstep, scalyr, grafana, prometheus]

Kanban (Softwareentwicklung), Requirement Analyse, Software Architecture, Team Building, Testen

11/2017 – 10/2018

Design, development and operation of software systems orchestrating the fulfillment of customer orders

[spring boot, openapi, maven, gradle, kotlin, java, intellij, junit, mockito, cucumber, zuchini, kubernetes, docker, aws, postgresql, kafka, bpm, camunda, github, ci/cd, jenkins, scalyr, grafana, prometheus]

Objektorientierte Analyse (OOA), Representational State Transfer (REST), Software Architecture

8/2013 – 4/2017

• Strategy, planning and design for a point-of-contact system for customers to sell items, from proof of concept through rollout across the USA.
• Development of backend microservices for acquiring and processing customer items.
• Deployment and operation of production system in the cloud.

[java, spring, mariadb, linux, docker]

Backend

8/2005 – 7/2013

• Design and development of Antics DMS, a multi-tenanted digital marketing platform, including:
   • acquisition of customer data from web forms, clicks and other behavior
   • dynamic segmentation of customers based on arbitrary criteria
   • construction of campaign websites and dashboards based on dynamic templates and other pluggable functionality
   • bulk sending of dynamically-generated emails/texts
• Integration with CRM and other external platforms.
• Operation and optimization of big data system in the cloud.

[java, apache, tomcat, struts, hibernate, postgres, freemarker, html, css, javascript, jquery, ckeditor, linux, postfix, smtp, oauth, mailgun, netsuite, salesforce, wordpress, appature, facebook]

Java (allg.)

8/2004 – 6/2005

Development of opensolaris.org, a portal building the developer and user community around the eponymous operating system software.

[java, tomcat, webwork, wiki, lucene, mailman, jive, markup, oracle]

Web Entwicklung

11/2002 – 7/2004

Strategy, design, development of universalgiving.org - an online giving platform (donations, volunteering) - from concept through to launch (and beyond).

[java, jsp, tomcat, mysql, linux, smtp, postfix, verisign]

Web Entwicklung

1/2001 – 2/2002

Strategy, design and development of the web portal for an early internet record label.

[java, jsp, html, javascript, linux, tomcat, mysql, verisign]

Web Entwicklung

5/2000 – 9/2000

Design and development of the e-commerce web application selling BEA's software products and training courses.

[java, jsp, solaris, oracle, weblogic]

Web Entwicklung

12/1999 – 3/2000

Development of a group web browsing service in an Internet startup environment.

[java, awt, activex, javascript, oracle, linux]

Java (allg.)