Kaarel Moppel
PostgreSQL Consultant at Self-employed
Tallinn, Harju maakond, Estonia
Summary
🤩
Rockstar🎓
Top SchoolKaarel Moppel is a PostgreSQL consultant with 12 years of hands-on experience designing and operating resilient data architectures for companies from Swedbank to Zalando and Cognite, now working independently from Tallinn. He specializes in PostgreSQL performance, reliability and tooling, and has contributed backend improvements to the popular pg_activity monitoring tool—adding nuanced waiting-state logic and query filtering features that help DBAs surface long-running work. As a Principal Database Reliability Engineer he combined operational rigor with engineering to scale critical data platforms, and earlier consulting roles sharpened his expertise across varied deployments and versions of Postgres. Kaarel pairs an MSc in Computer and Systems Engineering with practical experience shipping observability and performance features, and is especially interested in advancing the broader Postgres ecosystem.
12 years of coding experience
10 years of employment as a software developer
Tapa Secondary SchoolMSc Computer and Systems Engineering, MSc Computer and Systems Engineering at Tallinn Technical UniversityBSc Computer and Systems Engineering, BSc Computer and Systems Engineering at TalTech – Tallinn University of Technology
English, Estonian, German, Russian
Github Skills (9)
postgresql10
sql10
python10
database9
admin9
database-administration9
monitoring9
databases9
cli8
Programming languages (13)
Github contributions (5)
dalibo/pg_activity
Dec 2018 - Mar 2020
pg_activity is a top like application for PostgreSQL server activity monitoring.
Role in this project:
Back-end Developer & Database Engineer
Back-end Developer & Database EngineerContributions:8 commits, 5 PRs, 5 comments in 1 year 3 months
Contributions summary:Kaarel primarily contributed to enhancing the functionality and performance of the `pg_activity` tool. Their work involved modifying the data retrieval logic to accurately reflect the "waiting" state of PostgreSQL sessions, particularly for PG10+ versions. They also implemented features like adjusting the refresh interval and adding a new flag, `--min-duration`, to filter queries based on duration, enhancing the tool's monitoring capabilities. Moreover, the user refactored the existing code to incorporate features such as duration mode.
postgresql-serversqlpostgrespostgresqlmonitoring
pg-spot-ops/pg-spot-operator
Oct 2024 - Mar 2025
Maintains stateful Postgres on Spot VMs
Contributions:10 reviews, 114 PRs, 305 pushes in 5 months
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