Alex Langenfeld
Software Engineer at Dagster Labs
Minneapolis, Minnesota, United States
Summary
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Rockstar🎓
Top SchoolAlex Langenfeld is a software engineer with 13 years of experience based in Minneapolis who specializes in backend systems and data orchestration. As a contributor at dagster-io, he works on Dagster — a prominent orchestration platform for data assets — focusing on event/run/snapshot storage and reliability. His recent contributions show strength modernizing persistent layers: migrating deprecated SQLAlchemy usage, adapting Alembic migrations, and adding indices to improve schema and query behavior. Pragmatic and detail-oriented, he balances production-focused fixes with compatibility across evolving library versions, making him an asset for teams maintaining long-lived data infrastructure.
13 years of coding experience
8 years of employment as a software developer
B.S, Computer Engineering; Computer Sciences, B.S, Computer Engineering; Computer Sciences at University of Wisconsin-Madison
Stackoverflow
251reputation
11kreached
9answers
0questions
Github Skills (12)
sqlalchemy10
python10
database-design10
sql9
cron6
etl6
dagster6
python-sphinx6
ordereddict6
job-scheduling6
pipeline6
data-science6
Programming languages (8)
Github contributions (5)
dagster-io/dagster
Apr 2019 - Jan 2023
An orchestration platform for the development, production, and observation of data assets.
Role in this project:
Back-end Engineer
Back-end EngineerContributions:16 releases, 3779 reviews, 1164 commits in 3 years 10 months
Contributions summary:Alex contributed to the codebase by migrating deprecated SQLAlchemy methods and adopting recommended replacements. They also modified code related to various Alembic versions, specifically adding and modifying columns, and adding indices, indicating a focus on database schema migrations. The changes involved interacting with event logs, runs, and snapshot functionalities, suggesting work on data storage and processing within the orchestration platform.
operationpythonobservationschedulermetadata
alexwyler/Resistance-Online
Mar 2012 - Apr 2012
Contributions:35 commits in 15 days
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