gem/oq-engine
Oct 2024 – Apr 2026
12 Months active
Languages Used
CSVINIPythonRSTShellTextUnknownC++
Technical Skills
Backend DevelopmentBug FixBug FixingCode DocumentationCode LintingCode Optimization
Michele Simionato
PROFILE
Michele Simionato
Over the past year, contributed extensively to the gem/oq-engine repository, delivering 199 features and resolving 133 bugs to advance seismic hazard and risk modeling. Focused on backend development and data processing, the work included refining risk computation pipelines, optimizing tiling and parallel processing, and enhancing API consistency. Leveraging Python, HDF5, and CI/CD automation, implemented robust data handling, improved test reliability, and streamlined deployment workflows. Architectural refactors and code quality initiatives reduced technical debt and improved maintainability, while targeted performance optimizations accelerated analytics. These efforts strengthened the reliability, scalability, and clarity of OpenQuake’s core hazard and risk analysis capabilities.
Overall Statistics
Feature vs Bugs
60%Features
Repository Contributions
602Total
Bugs
133
Commits
602
Features
199
Lines of code
7,272,111
Activity Months12
Your Network
34 peopleShared Repositories
34
Work History
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026: Implemented end-to-end CI/CD and testing enhancements for gem/oq-engine within OpenQuake, enabling automated testing, Docker image builds, demos, and documentation publishing. Expanded test coverage for WebUI and engine modes to improve robustness. Merged critical bug fixes for the Morikawa and Fujiwara 2013 GMM (PR #11356), strengthening model reliability. These efforts improved deployment reliability, accelerated release cycles, and delivered tangible business value through reproducible builds and better confidence in results.
1 Commits • 1 Features
Apr 1, 2026April 2026: Implemented end-to-end CI/CD and testing enhancements for gem/oq-engine within OpenQuake, enabling automated testing, Docker image builds, demos, and documentation publishing. Expanded test coverage for WebUI and engine modes to improve robustness. Merged critical bug fixes for the Morikawa and Fujiwara 2013 GMM (PR #11356), strengthening model reliability. These efforts improved deployment reliability, accelerated release cycles, and delivered tangible business value through reproducible builds and better confidence in results.
April 2026
March 2026
14 Commits • 1 Features
Mar 1, 2026March 2026 (2026-03) - gem/oq-engine: Improved risk assessment test reliability and delivered broad code quality enhancements. Stabilized risk scenario tests, aligned CI to risk-focused calculations, and implemented Ruff-based linting with NumPy compatibility rules to improve maintainability and prevent regressions. These changes reduce flaky tests, speed up feedback, and raise overall software quality.
March 2026
14 Commits • 1 Features
Mar 1, 2026March 2026 (2026-03) - gem/oq-engine: Improved risk assessment test reliability and delivered broad code quality enhancements. Stabilized risk scenario tests, aligned CI to risk-focused calculations, and implemented Ruff-based linting with NumPy compatibility rules to improve maintainability and prevent regressions. These changes reduce flaky tests, speed up feedback, and raise overall software quality.
February 2026
8 Commits • 3 Features
Feb 1, 2026February 2026: Delivered core enhancements and reliability improvements in gem/oq-engine, focusing on feature delivery, cross-version compatibility, and test stability. Built a foundation for robust ground-motion modeling configuration and geospatial indexing, with sustained improvements to developer productivity and operational reliability.
8 Commits • 3 Features
Feb 1, 2026February 2026: Delivered core enhancements and reliability improvements in gem/oq-engine, focusing on feature delivery, cross-version compatibility, and test stability. Built a foundation for robust ground-motion modeling configuration and geospatial indexing, with sustained improvements to developer productivity and operational reliability.
February 2026
December 2025
1 Commits
Dec 1, 2025December 2025 (2025-12): Focused on stability and reliability of demo outputs in gem/oq-engine by hardening parameter handling in the to_ini function. Delivered a targeted bug fix to ensure demo results are unaffected by irrelevant parameters, with emphasis on the 'cache' parameter. This change reduces variability in demos and clarifies configuration semantics. Commit contributing fix: 88b50ada586e7dd20cf3259268abe9cb3e3c3ccd ('Fixed demos').
December 2025
1 Commits
Dec 1, 2025December 2025 (2025-12): Focused on stability and reliability of demo outputs in gem/oq-engine by hardening parameter handling in the to_ini function. Delivered a targeted bug fix to ensure demo results are unaffected by irrelevant parameters, with emphasis on the 'cache' parameter. This change reduces variability in demos and clarifies configuration semantics. Commit contributing fix: 88b50ada586e7dd20cf3259268abe9cb3e3c3ccd ('Fixed demos').
November 2025
35 Commits • 12 Features
Nov 1, 2025Month: 2025-11 — gem/oq-engine: Delivered a set of critical risk-modeling improvements, performance gains, SES integration, and reliability enhancements. The work emphasizes business value through faster risk analysis, more accurate risk metrics, and stronger maintainability and CI. Highlights include: core risk-model fixes, feature refinements, performance optimizations, SES integration, and robust testing/documentation updates.
35 Commits • 12 Features
Nov 1, 2025Month: 2025-11 — gem/oq-engine: Delivered a set of critical risk-modeling improvements, performance gains, SES integration, and reliability enhancements. The work emphasizes business value through faster risk analysis, more accurate risk metrics, and stronger maintainability and CI. Highlights include: core risk-model fixes, feature refinements, performance optimizations, SES integration, and robust testing/documentation updates.
November 2025
October 2025
14 Commits • 3 Features
Oct 1, 2025October 2025: gem/oq-engine delivered targeted performance, stability, and API enhancements with clear business value. Major features include tiling performance optimizations (refined configuration, reduced tile count via hints, and increased parallel tiling memory cap) with an updated changelog; hazard library robustness improvements (assert use_rates is enabled, align source_reader usage, and removal of an unused rupture performance index) to bolster stability; hazard API cleanup and data model simplification (removal of deprecated calc_hazard_curve in favor of calc_hazard_curves and elimination of unused datasets) to simplify data handling; hazard analysis behavior change (default minimum magnitude in global SES set from 0 to 5) with corresponding documentation updates; and comprehensive documentation improvements across hazard docs, guides, and logging guidance. Major bugs fixed include removal of deprecated paths and unused datasets and several documentation/test fixes. Overall, these efforts reduce maintenance burden, accelerate risk analysis workflows, and improve reliability for downstream analytics, delivering measurable business value in performance, API clarity, and developer experience. Technologies demonstrated include advanced performance tuning, memory management for parallel tiling, API deprecation and data model simplification, code hygiene, and thorough documentation.
October 2025
14 Commits • 3 Features
Oct 1, 2025October 2025: gem/oq-engine delivered targeted performance, stability, and API enhancements with clear business value. Major features include tiling performance optimizations (refined configuration, reduced tile count via hints, and increased parallel tiling memory cap) with an updated changelog; hazard library robustness improvements (assert use_rates is enabled, align source_reader usage, and removal of an unused rupture performance index) to bolster stability; hazard API cleanup and data model simplification (removal of deprecated calc_hazard_curve in favor of calc_hazard_curves and elimination of unused datasets) to simplify data handling; hazard analysis behavior change (default minimum magnitude in global SES set from 0 to 5) with corresponding documentation updates; and comprehensive documentation improvements across hazard docs, guides, and logging guidance. Major bugs fixed include removal of deprecated paths and unused datasets and several documentation/test fixes. Overall, these efforts reduce maintenance burden, accelerate risk analysis workflows, and improve reliability for downstream analytics, delivering measurable business value in performance, API clarity, and developer experience. Technologies demonstrated include advanced performance tuning, memory management for parallel tiling, API deprecation and data model simplification, code hygiene, and thorough documentation.
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025 — gem/oq-engine monthly summary. Focused on delivering a new Calculation Results Content Type and reinforcing testing/deployment workflows to ensure robust OpenQuake integration. Major bugs fixed: none reported this month. Overall impact: improved data handling at the calculation results entry point, safer rollout across environments, and a foundation for further data-type extensibility. Technologies/skills demonstrated: content-type design, CI/CD workflow automation, PR-driven collaboration, OpenQuake engine integration, Git.
1 Commits • 1 Features
Sep 1, 2025September 2025 — gem/oq-engine monthly summary. Focused on delivering a new Calculation Results Content Type and reinforcing testing/deployment workflows to ensure robust OpenQuake integration. Major bugs fixed: none reported this month. Overall impact: improved data handling at the calculation results entry point, safer rollout across environments, and a foundation for further data-type extensibility. Technologies/skills demonstrated: content-type design, CI/CD workflow automation, PR-driven collaboration, OpenQuake engine integration, Git.
September 2025
March 2025
1 Commits • 1 Features
Mar 1, 2025March 2025 monthly summary for gem/oq-engine. Focused on refining seismic hazard calculation through targeted p-type source weighting adjustments, delivering improved accuracy for scenarios with shorter context lengths and stabilizing the underlying weighting logic. This work enhances the reliability of hazard estimates used in risk assessment and decision-making, while laying groundwork for further calibration and validation efforts.
March 2025
1 Commits • 1 Features
Mar 1, 2025March 2025 monthly summary for gem/oq-engine. Focused on refining seismic hazard calculation through targeted p-type source weighting adjustments, delivering improved accuracy for scenarios with shorter context lengths and stabilizing the underlying weighting logic. This work enhances the reliability of hazard estimates used in risk assessment and decision-making, while laying groundwork for further calibration and validation efforts.
January 2025
107 Commits • 35 Features
Jan 1, 2025January 2025 highlights: gem/oq-engine delivered targeted code-quality improvements, data-processing enhancements, and stability fixes that reduce technical debt and improve reliability for downstream analytics. Key features include ShakeMap data handling enhancements (parser extended to SA(0.6), SA06 support, and removal of correlation in shakemaps), platform compatibility and workflow improvements (Python 3.10 import fix and updated Aristotle workflow), and naming/code-hygiene improvements (build_log_dstore and create_job_dstore renames) along with broader refactors. Major bugs fixed include not storing oqparam when already present, macOS HDF5 issues resolved, a database integrity check, and restoration of avg_losses behavior in Aristotle mode, plus several test/calculator fixes. Impact: reduced production warnings and deprecations, more reliable data pipelines and analytics, faster and clearer weight calculations, and improved CI/test/documentation hygiene. Technologies demonstrated: Python 3.10 compatibility, Ruff linting, doctest/test suite improvements, spatial queries and preclassical optimization, and comprehensive code refactors for maintainability.
107 Commits • 35 Features
Jan 1, 2025January 2025 highlights: gem/oq-engine delivered targeted code-quality improvements, data-processing enhancements, and stability fixes that reduce technical debt and improve reliability for downstream analytics. Key features include ShakeMap data handling enhancements (parser extended to SA(0.6), SA06 support, and removal of correlation in shakemaps), platform compatibility and workflow improvements (Python 3.10 import fix and updated Aristotle workflow), and naming/code-hygiene improvements (build_log_dstore and create_job_dstore renames) along with broader refactors. Major bugs fixed include not storing oqparam when already present, macOS HDF5 issues resolved, a database integrity check, and restoration of avg_losses behavior in Aristotle mode, plus several test/calculator fixes. Impact: reduced production warnings and deprecations, more reliable data pipelines and analytics, faster and clearer weight calculations, and improved CI/test/documentation hygiene. Technologies demonstrated: Python 3.10 compatibility, Ruff linting, doctest/test suite improvements, spatial queries and preclassical optimization, and comprehensive code refactors for maintainability.
January 2025
December 2024
210 Commits • 72 Features
Dec 1, 2024December 2024 monthly summary for gem/oq-engine focused on reliability, maintainability, and performance improvements across data pipelines, tests, and code quality. Highlights include a site collection filtering fix for event_based with --hc, architectural refactor moving Django view logic into shakemap.validate, and data workflow enhancements for download and station data handling. Added monitoring and configurability for AristotleParam (exposure_hdf5) and aristotle_validate, plus logging improvements and CI performance optimizations to accelerate feedback cycles.
December 2024
210 Commits • 72 Features
Dec 1, 2024December 2024 monthly summary for gem/oq-engine focused on reliability, maintainability, and performance improvements across data pipelines, tests, and code quality. Highlights include a site collection filtering fix for event_based with --hc, architectural refactor moving Django view logic into shakemap.validate, and data workflow enhancements for download and station data handling. Added monitoring and configurability for AristotleParam (exposure_hdf5) and aristotle_validate, plus logging improvements and CI performance optimizations to accelerate feedback cycles.
November 2024
162 Commits • 50 Features
Nov 1, 20242024-11 monthly summary for gem/oq-engine: Delivered key features expanding risk modeling capabilities and improved developer experience, while stabilizing CI and strengthening test reliability. Key features delivered include GmfComputer Documentation; PointRupture refactor and documentation; CompositeRiskModel perils; Get_output -> get_outputs API consistency; and changelog updates for Batch 2. Major bugs fixed include CI stability improvements with Zeromq timeout adjustment; wide-ranging test fixes across the suite; damage calculation and data mapping corrections; and targeted code cleanup to improve maintainability. Overall impact: faster delivery cycles, more robust risk calculations, clearer API, and more reliable release notes, with improved documentation and data handling. Technologies/skills demonstrated: API refactor and consistency, risk modeling enhancements, CI/test automation and stability, Ruff lint fixes, and comprehensive code cleanup.
162 Commits • 50 Features
Nov 1, 20242024-11 monthly summary for gem/oq-engine: Delivered key features expanding risk modeling capabilities and improved developer experience, while stabilizing CI and strengthening test reliability. Key features delivered include GmfComputer Documentation; PointRupture refactor and documentation; CompositeRiskModel perils; Get_output -> get_outputs API consistency; and changelog updates for Batch 2. Major bugs fixed include CI stability improvements with Zeromq timeout adjustment; wide-ranging test fixes across the suite; damage calculation and data mapping corrections; and targeted code cleanup to improve maintainability. Overall impact: faster delivery cycles, more robust risk calculations, clearer API, and more reliable release notes, with improved documentation and data handling. Technologies/skills demonstrated: API refactor and consistency, risk modeling enhancements, CI/test automation and stability, Ruff lint fixes, and comprehensive code cleanup.
November 2024
October 2024
48 Commits • 20 Features
Oct 1, 2024October 2024 performance summary for gem/oq-engine: delivered feature-rich updates expanding fault-source reading, enhanced risk-modeling capabilities, and reinforced release reliability through targeted test and code-quality improvements. The work increased modeling accuracy, expanded data coverage, and reduced release risk, directly supporting more informed risk insights and faster deployment cycles.
October 2024
48 Commits • 20 Features
Oct 1, 2024October 2024 performance summary for gem/oq-engine: delivered feature-rich updates expanding fault-source reading, enhanced risk-modeling capabilities, and reinforced release reliability through targeted test and code-quality improvements. The work increased modeling accuracy, expanded data coverage, and reduced release risk, directly supporting more informed risk insights and faster deployment cycles.
Activity
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Quality Metrics
Correctness87.2%
Maintainability88.0%
Architecture83.2%
Performance78.8%
AI Usage20.6%
Skills & Technologies
Programming Languages
C++CSVCythonDebianHCLHDF5HTMLINIJSONJavaScript
Technical Skills
API DevelopmentAPI IntegrationAlgorithm DesignAlgorithm RefactoringAlgorithm RefinementBackend DevelopmentBug FixBug FixingBuild AutomationBuild SystemCI/CDCSV HandlingChangelog ManagementClean CodeCleanup
Repositories Contributed To
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