2011–2013 · Mobile voxel game
Steinkraft / PetraVis
An early voxel sandbox for iOS, Android and Windows Phone. I developed and sold the game across multiple platforms; it reached 27,900 sales in 2012 and more than 100,000 trial users.
Operations research · software development · independent games
Dr. André Schnabel
I work on optimization and software at GAMS. This is also a small archive of the games, worlds and tools I have built along the way.
PhD EconomicsLeibniz University Hannover
27,900PetraVis sales in 2012
100,000+trial users of PetraVis
About
Researcher, developer and maker.
As an Operations Research Analyst and Senior Software Developer at GAMS Software GmbH, I combine computer science, economics and optimization. My research includes profit-oriented project scheduling; current interests include machine-learning methods for algorithmic performance models and functional programming languages.
Alongside academic work, I created and released mobile games and kept building small experiments, game engines and tools. The projects below are a deliberately personal selection rather than a complete catalogue.
- Focus
- Optimization & performance modelling
- Education
- PhD Economics · MSc & BSc Computer Science
- Development
- C/C++, C#, Java, Python & GAMS
- Current role
- Operations Research Analyst at GAMS
Selected work
Four projects I am especially proud of.
From an early mobile voxel world to hand-built platformers and 3D experiments.
Platform game
CommanderTux
A colourful jump-and-run inspired by Commander Keen, built in C++. Its world, characters and playful level design came from an early period of learning game development by making complete games.
2011 · 3D experiment
Weltraumsoldat3D / SpaceSoldier
A compact 3D action experiment with its own levels, assets, sound and a distinctly pulp-science-fiction identity.
Ludum Dare · Game jam
TinyWorld
A small, self-contained game made for Ludum Dare: a tiny world, a green protagonist and a deliberately handcrafted visual language.
Archive
More games, more experiments.
A few further snapshots from a much larger body of school-, university- and independent-development work.
Towers
A Python tower-defence game with a hand-built map and HUD.
FurbyKill3D
An early 3D shooter experiment, following several 2D versions.
SpaceJumper
A top-down scrolling space shooter written in C++.
Browse the wider historical archive
Games
- CommanderTux Duel
- Starfighter
- FurbyKill / JFurbyKill
- Breakout, Pong and Snake
- Sokoban and Tron
Worlds & prototypes
- Timoratus
- TinyWorld variants
- Steinkraft prototypes
- Textured Raycaster
Tools
- Project Inspector
- JProjectInspector
- KCImageCollector
- Small utilities and experiments
Music & sound — Original compositions and sound design created for games and experiments. Listen on Bandcamp.
Experience
Research and real-world software.
The games sit alongside a career in operations research, industrial software and academia.
Operations Research Analyst / Senior Software Developer
GAMS Software GmbH, Braunschweig
External software development
Heye International / Ardagh Group — article management and automated defect classification for glass-bottle inspection.
Research Assistant
Institute for Production Management, Leibniz University Hannover — teaching, project scheduling and revenue-management research.
Independent game developer
Development and sale of Steinkraft / PetraVis for mobile platforms.
Research & publications
Scheduling, virtual twins and performance modelling.
Research in operations management and optimization, including journal articles, conference proceedings, working papers and a PhD thesis.
Virtual twin decision support
2022 · International Journal of Production Research
Regeneration process chains with integrated decision support for individual regeneration processes.
Profit-oriented project scheduling
2018 · Business Research
Flexible capacity constraints in resource-constrained project scheduling.
PhD thesis
2020 · Leibniz University Hannover
Heuristics for profit-oriented scheduling of resource-constrained projects with extensible capacities.
Full publication list
Journal publications
- Kellenbrink, C.; Nübel, N.; Schnabel, A.; Gilge, P.; Seume, J. R.; Denkena, B.; Helber, S. (2022). A regeneration process chain with an integrated decision support system for individual regeneration processes based on a virtual twin. International Journal of Production Research, 60(13), 4137–4158.
- Schnabel, A.; Kellenbrink, C.; Helber, S. (2018). Profit-oriented scheduling of resource-constrained projects with flexible capacity constraints. Business Research, 11(2), 329–356.
Proceedings & working papers
- Schnabel, A.; Kellenbrink, C. (2018). Scheduling resource-constrained projects with makespan-dependent revenues and costly overcapacity. 16th International Conference on Project Management and Scheduling, Rome, 205–208.
- Südbeck, I.; Mindlina, J.; Schnabel, A.; Helber, S. (2022). Using Recurrent Neural Networks for the Performance Analysis and Optimization of Stochastic Milkrun-Supplied Flow Lines. Hannover Economic Papers, dp-703.
- Schnabel, A.; Kellenbrink, C.; Helber, S. (2017). Profit-oriented scheduling of resource-constrained projects with flexible capacity constraints. Diskussionspapier Nr. 593, Leibniz Universität Hannover.
Theses
- PhD thesis (2020): Heuristiken für die gewinnorientierte Planung ressourcenbeschränkter Projekte mit erweiterbaren Kapazitäten.
- MSc thesis (2013): Entwicklung einer Heuristik für den Testbedarf von Open Source Softwareprojekten auf einer Social Coding Site.
- BSc thesis (2011): Visualisierung der Ausbreitung von Informationen in einem Digitalen Sozialen Netzwerk.
Profiles
Find out more.
Publications, current work and source code are available through these profiles.