Hello, World!I am Alejandro Cabello Jiménez
Posts
Explore my latest articles, technical publications, and conference talks on large-scale backend architecture and Python.
TalksEuroPython 2026
Returning to EuroPython with Alberto Maldonado to share how we cut our flight search engine's execution time from over 4 seconds to under 500 milliseconds by tuning Python's GC, replacing Pydantic with TypedDict, and restructuring how we traverse and parallelize work in AWS Lambda.
Open Sourcegh-inspector: inspect GitHub orgs without cloning
A CLI tool that scans GitHub organizations for dependency versions, CODEOWNERS, and Python version targets, all without cloning a single repo.
BlogHow I Use PyCharm at TravelPerk
JetBrains interviewed me about how I use PyCharm to build the company’s flight search engine.
BlogDX Surveys and the Law of Small Numbers
Why developer experience surveys with small samples can lead to misleading conclusions, and how to interpret them with statistical perspective.
TalksPyConES 2025
Real-world Python performance optimizations from our flight search engine at Perk, presented with Alberto Maldonado at PyConES 2025 in Seville.
TalksEuroPython 2025
This talk at EuroPython 2025 shows the path for a large Python migration, over 100 repositories at TravelPerk from Pydantic V1 to V2. It covers strategies for handling breaking changes, refactoring codebases, testing safely, and unlocking performance improvements.
Experience
A selection of companies and organizations I have worked with, contributing to exciting projects and innovations.
