Data engineering · Automation
David Häggström Pérez-Flecha
Data analyst with a software development background. I build ETL pipelines in Python and SQL, automate processes that used to be done by hand, and write about what I learn along the way.
Featured projects
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ant-simulation
Ant foraging simulation where the optimal route emerges with no central control, just local pheromones and evaporation.
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git-worktree-tools
Scripts to set up git worktrees with their own Python venvs in a single command. Born from a Jupyter notebook workflow where switching branches was killing my kernel.
Latest posts
- How I cleaned a 120-notebook mess
From 120+ Jupyter notebooks and `sys.path` hacks to an installable package with snapshot tests, and the unexpected payoff for AI coding.