David Justen

TU Berlin, BIFOLD
Big Data Engineering Group (DAMS Lab)
Faculty IV - Electrical Engineering and Computer Science

Room TEL-0812, Ernst-Reuter-Platz 7, 10587 Berlin
david.justen@tu-berlin.de

I am a second-year PhD student at Technische Universität Berlin, supervised by Prof. Matthias Boehm and member of the BIFOLD Graduate School. Prior to this, I was a PhD student at Prof. Hasso Plattner’s Enterprise Platform and Integration Concepts (EPIC) chair at the Hasso Plattner Institute in Potsdam. My research focusses on query optimization for analytical database systems and cloud-based data processing. Specifically, I am looking into adaptive query processing and robust plan generation to reduce the effects of erroneous cardinality estimates.

Publications

2024

  • David Justen, Daniel Ritter, Campbell Fraser, Andrew Lamb, Nga Tran, Allison Lee, Thomas Bodner, Mhd Yamen Haddad, Steffen Zeuch, Volker Markl, Matthias Boehm: POLAR: Adaptive and Non-invasive Join Order Selection via Plans of Least Resistance. PVLDB 2024 [paper, slides, poster]

2022

  • David Justen: Cost-efficiency and Performance Robustness in Serverless Data Exchange. SRC@SIGMOD 2022 [paper]

Teaching

  • Programming Practical: Data Systems [WS23, SS24]
  • Research and Implementation of Database Concepts (HPI) [WS22]
  • Develop Your Own Database (HPI) [SS22]
  • Trends and Concepts of Business Application Architecture (HPI) [SS22]

Work Experience

  • October ‘23 - present
    Research Associate @ Technische Universität, Berlin, DE
  • March ‘22 - September ‘23
    Research Associate @ Hasso Plattner Institute, Potsdam, DE
  • October ‘19 - March ‘20
    Software Development Intern @ SAP, New York, US
  • March ‘18 - June ‘18
    Software Development Intern @ Native Instruments, Berlin, DE

Education

  • 2018 - 2022
    IT-Systems Engineering (M.Sc.), Hasso Plattner Institute (University of Potsdam)
    Thesis: Cost-efficiency and Performance Robustness in Serverless Join Processing
  • 2015 - 2018
    Media Computer Science (B.Sc.), Berlin University of Applied Sciences and Technology
    Thesis: Evolving Neural Networks to Steer Autonomous Agents in a Labyrinth

Unrelated Interests

Besides my work as a researcher I am an active member of TAMLI, a charitable organization that supervises young adults and delegates them to a voluntary service in a home for people with special needs in Israel. I am also a part-time DJ - so hit me up if you happen to know how to get a booking for Andy Pavlo’s database courses.