Felix Uellendall
Senior Software Engineer at The Apache Software Foundation
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolFelix Uellendall is a Senior Software Engineer based in Berlin with nine years of experience building cloud-native data platforms and developer tooling, currently improving Apache Airflow’s developer and DAG authoring experiences at Astronomer. He is an active Apache Airflow committer and Open Source advocate who has added hooks, sensors, operators, tests, and provider integrations to one of the most widely used workflow engines. Felix blends backend and DevOps expertise—Terraform, Kubernetes (EKS/Fargate), Snowflake, MWAA—and has led migrations and scalable CI workflows that supported hundreds of concurrent engineers. Known for mentoring, code reviews, and raising test quality and coverage, he pairs practical engineering with community-first collaboration. Outside work he’s drawn to quiet places—hiking, piano, and thinking about the universe—which informs his thoughtful approach to complex systems.
9 years of coding experience
9 years of employment as a software developer
Applied Computer Science, Applied Computer Science at Fachhochschule AachenInformationstechnischer Assistent, Information Technology, Informationstechnischer Assistent, Information Technology at Berufskolleg für Gestaltung und Technik der Stadt AachenShortened apprenticeship for software development, Information Technology, Shortened apprenticeship for software development, Information Technology at Oberstufenzentrum Informationstechnik und Medizintechnik Berlin
Github Skills (11)
apache-airflow10
workflow-engine10
orchestration10
python10
imap10
data-engineering10
testing10
cicd9
devops9
sql8
postgresql5
Programming languages (14)
Github contributions (5)
apache/airflow
Feb 2018 - Mar 2025
Apache Airflow - A platform to programmatically author, schedule, and monitor workflows
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:294 reviews, 198 PRs, 82 pushes in 7 years 2 months
Contributions summary:Felix contributed significantly to the Airflow project by implementing and improving the IMAP hook, adding an ImapAttachmentSensor, and extending tests for various operators. They addressed bugs and improved code coverage for features such as BashOperator, Hive2SambaOperator, and JDBCOperator, along with improving documentation. The user also demonstrated experience in cloud infrastructure, as evidenced by the addition of a missing remote logging field.
monitorpythonschedulerapacheprogrammatically
feluelle/github-crawler-lib
Sep 2017 - Jan 2021
A JavaScript Library for web crawling github.com
Contributions:2 PRs, 13 pushes, 1 branch in 3 years 3 months
javascript-libraryweb-crawlerjavascriptweb-crawlingnodejs
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