Johan Ringdahl
Stockholm, Sweden
Summary
🤩
Rockstar🎓
Top SchoolJohan Ringdahl is a seasoned Java developer with 10 years of professional experience building resilient backend systems, including a seven-year tenure at Spotify and earlier platform work at Oracle. He specializes in server-side design and performance improvements, demonstrated by contributions to the popular open-source Heroic time-series database where he improved error propagation, memory-efficient data fetching, and aggregation quotas. Comfortable in both large-scale cloud environments and embedded telephony/C++ projects, Johan brings a pragmatic engineering mindset from consultancy and product teams across telecom and defense. He holds an M.Sc. in Computer Science from Uppsala University and pairs deep technical expertise with a history of shipping test-backed, production-ready features.
10 years of coding experience
17 years of employment as a software developer
M.Sc, Computer Science, M.Sc, Computer Science at Uppsala University
Github Skills (9)
timeseries-database10
javas10
junit10
aggregations10
java10
bigtable10
jtest10
metadata-management9
error-handling9
Programming languages (1)
Github contributions (5)
spotify/heroic
Dec 2016 - Jan 2017
The Heroic Time Series Database
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 commits, 6 PRs, 25 comments in 15 days
Contributions summary:Johan primarily focused on enhancing the `heroic` time-series database backend. Their contributions include propagating request errors for better error handling, implementing an aggregation quota to limit data retention, and streamlining data fetching processes to improve memory usage. The user also added a metadata-write shell task for improved data management and wrote tests using TestRule for the project's backend.
time-seriestime-series-databasedatabaseseries-database
jo-ri/heroic
Jan 2017 - Mar 2017
Contributions:5 PRs, 56 pushes, 9 branches in 2 months
time-seriestime-series-databasedatabaseseries-database
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