equinor/ert
Jul 2025 – Mar 2026
4 Months active
Languages Used
Python
Technical Skills
Backend DevelopmentError HandlingSystem AdministrationPythontest automationunit testing
Jonathan Karlsen
PROFILE
Jonathan Karlsen
Over an 18-month period, contributed to the equinor/ert repository by building and refining backend systems, configuration workflows, and user interfaces to improve reliability, maintainability, and data handling. Leveraged Python, PyQt, and asynchronous programming to deliver robust event-driven architectures, centralized validation logic, and efficient test automation. Enhanced ensemble evaluation, job management, and plotting features while modernizing code through type hinting, refactoring, and migration to libraries like Polars. Focused on reducing runtime failures, accelerating CI feedback, and improving user experience through real-time progress reporting, error handling, and UI consistency. The work demonstrates technical depth in backend development and system design.
Overall Statistics
Feature vs Bugs
25%Features
Repository Contributions
5Total
Bugs
3
Commits
5
Features
1
Lines of code
141
Activity Months4
Your Network
122 peopleWork History
March 2026
1 Commits
Mar 1, 2026Month 2026-03: Stabilized the performance test suite in equinor/ert by extending the test session timeout from 1800 seconds to 2400 seconds to accommodate longer-running performance tests. This temporary change reduced CI timeouts and flaky runs while slow surface exports are being fixed. Implemented via commit a0fb9e7b4f7c6e1b44a070910f9fbea48781c9da, aligned with the longer-running test introduced by commit e30e52f. Prepared for revert once slow surface fixes are in place.
1 Commits
Mar 1, 2026Month 2026-03: Stabilized the performance test suite in equinor/ert by extending the test session timeout from 1800 seconds to 2400 seconds to accommodate longer-running performance tests. This temporary change reduced CI timeouts and flaky runs while slow surface exports are being fixed. Implemented via commit a0fb9e7b4f7c6e1b44a070910f9fbea48781c9da, aligned with the longer-running test introduced by commit e30e52f. Prepared for revert once slow surface fixes are in place.
March 2026
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026: Delivered a plugin-based IP address resolution hook for cluster jobs in equinor/ert, enabling extensible and configurable IP selection with backward-compatible behavior. This work lays the foundation for flexible networking strategies across heterogeneous environments and improves automation of cluster communication back to the central system.
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026: Delivered a plugin-based IP address resolution hook for cluster jobs in equinor/ert, enabling extensible and configurable IP selection with backward-compatible behavior. This work lays the foundation for flexible networking strategies across heterogeneous environments and improves automation of cluster communication back to the central system.
December 2025
2 Commits
Dec 1, 2025Month 2025-12: Focused on reliability and test stability in equinor/ert. Delivered targeted fixes to flaky tests affecting simulation flow and warning/termination dialogs, enabling more predictable CI and faster release cycles. Key changes include ensuring the simulation evaluation starts before handling the termination dialog and simplifying the handling of the warning dialog, which reduced race conditions and test flakiness.
2 Commits
Dec 1, 2025Month 2025-12: Focused on reliability and test stability in equinor/ert. Delivered targeted fixes to flaky tests affecting simulation flow and warning/termination dialogs, enabling more predictable CI and faster release cycles. Key changes include ensuring the simulation evaluation starts before handling the termination dialog and simplifying the handling of the warning dialog, which reduced race conditions and test flakiness.
December 2025
July 2025
1 Commits
Jul 1, 2025July 2025 monthly summary for equinor/ert focusing on reliability and observability improvements across scheduler integrations. Implemented a cross-scheduler bug fix for job submission status handling that refines error reporting to emit warnings or debug logs when a job has not been submitted or was not submitted properly, rather than surfacing as errors. This behavior now applies consistently across LSF, OpenPBS, and Slurm, reducing alert noise and better reflecting realistic job states.
July 2025
1 Commits
Jul 1, 2025July 2025 monthly summary for equinor/ert focusing on reliability and observability improvements across scheduler integrations. Implemented a cross-scheduler bug fix for job submission status handling that refines error reporting to emit warnings or debug logs when a job has not been submitted or was not submitted properly, rather than surfacing as errors. This behavior now applies consistently across LSF, OpenPBS, and Slurm, reducing alert noise and better reflecting realistic job states.
Activity
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Quality Metrics
Correctness88.0%
Maintainability84.0%
Architecture88.0%
Performance76.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
Python
Technical Skills
Backend DevelopmentError HandlingPythonSystem Administrationnetwork programmingperformance optimizationplugin developmenttest automationtestingunit testing
Repositories Contributed To
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