threatgrid/ctia
Nov 2024 – Jun 2026
6 Months active
Languages Used
ClojureYAML
Technical Skills
Backend DevelopmentDependency ManagementDevOpsElasticsearchAPI DevelopmentCode Ownership Management
Guillaume Erétéo
PROFILE
Guillaume Erétéo
Over six months, contributed to the threatgrid/ctia repository by building and refining backend features focused on incident management, search engine compatibility, and operational governance. Leveraging Clojure and YAML, implemented OpenSearch 2.x/3.x support with engine-driven configuration, parallelized bulk operations for performance gains, and enhanced Elasticsearch index handling. Addressed complex timestamp preservation issues to ensure accurate incident lifecycle tracking, improving dashboard reliability and SLA reporting. Expanded test coverage with unit and end-to-end tests, introduced multi-engine CI workflows, and maintained robust dependency and code ownership management. The work emphasized backend development, concurrent programming, and testing to deliver stable, maintainable infrastructure improvements.
Overall Statistics
Feature vs Bugs
67%Features
Repository Contributions
11Total
Bugs
3
Commits
11
Features
6
Lines of code
1,984
Activity Months6
Your Network
265 peopleSame Organization
@cisco.com257
Work History
June 2026
2 Commits
Jun 1, 2026June 2026 monthly summary for threatgrid/ctia: incident management timestamp correctness fixes, expanded test coverage, and stability improvements that directly enhance data accuracy in engagement metrics and dashboards.
2 Commits
Jun 1, 2026June 2026 monthly summary for threatgrid/ctia: incident management timestamp correctness fixes, expanded test coverage, and stability improvements that directly enhance data accuracy in engagement metrics and dashboards.
June 2026
March 2026
2 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for threatgrid/ctia focused on delivering business value through performance improvements and data accuracy fixes, supported by expanded test coverage and cross-team collaboration. Key features delivered: Bulk Operations Parallelization Performance Enhancement, which parallelizes processing across independent entity types to reduce Elasticsearch round-trip wait times during bulk and bundle operations. Major bugs fixed: Incident Time Tracking Accuracy—Re-close Timestamp Update and TTR Recalculation, ensuring that a re-closed incident updates the closed timestamp and recomputes the opened_to_closed interval to reflect actual time-to-resolution. Impact: faster bulk workflows, more reliable incident duration reporting, and improved metrics credibility for leadership and stakeholders. Technologies/skills demonstrated: parallel processing with pmap, ES optimization, test-driven development with unit and E2E tests, and cross-team collaboration as evidenced by co-authored commits.
March 2026
2 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for threatgrid/ctia focused on delivering business value through performance improvements and data accuracy fixes, supported by expanded test coverage and cross-team collaboration. Key features delivered: Bulk Operations Parallelization Performance Enhancement, which parallelizes processing across independent entity types to reduce Elasticsearch round-trip wait times during bulk and bundle operations. Major bugs fixed: Incident Time Tracking Accuracy—Re-close Timestamp Update and TTR Recalculation, ensuring that a re-closed incident updates the closed timestamp and recomputes the opened_to_closed interval to reflect actual time-to-resolution. Impact: faster bulk workflows, more reliable incident duration reporting, and improved metrics credibility for leadership and stakeholders. Technologies/skills demonstrated: parallel processing with pmap, ES optimization, test-driven development with unit and E2E tests, and cross-team collaboration as evidenced by co-authored commits.
December 2025
1 Commits • 1 Features
Dec 1, 2025Month: 2025-12. Delivered OpenSearch 2.x/3.x compatibility in CTIA with engine-driven configuration and testing. Introduced an :engine parameter for store configuration and added conditional lifecycle handling (Elasticsearch ILM vs OpenSearch IAM/ISM) with comprehensive tests and docs to ensure functionality across both engines while preserving backward compatibility. Implemented engine property handling to convert engine values from string to keyword, enabling ductile and CTIA to interoperate with OpenSearch without production config changes. Added end-to-end OpenSearch integration tests (2.x and 3.x) validating connection, index creation, alias setup, dynamic settings updates, and ILM→ISM policy transformation; all 26 assertions passing. Created CTIA initialization tests for OpenSearch, covering configuration loading, engine conversion, and multi-engine readiness. Built multi-engine testing support (CTIA_TEST_ENGINES) to run tests against Elasticsearch and OpenSearch 2.x/3.x in CI, including docker-compose services for OpenSearch versions and a matrix expansion in CI jobs. Upgraded and pinned ductile to stable 0.6.0, aligning with lifecycle API migration, and updated CI to include explicit ductile lifecycle usage. Documentation and testing coverage improvements: OPENSEARCH_TESTING.md added; OPENSEARCH_MIGRATION.md removed as integration is now direct; tests updated to reflect multi-engine workflows. Business value: reduces migration risk for customers moving to OpenSearch, validates cross-engine compatibility, improves reliability and deployment confidence, accelerates time-to-value in multi-engine environments, and strengthens CI coverage to prevent regressions before production deployment.
1 Commits • 1 Features
Dec 1, 2025Month: 2025-12. Delivered OpenSearch 2.x/3.x compatibility in CTIA with engine-driven configuration and testing. Introduced an :engine parameter for store configuration and added conditional lifecycle handling (Elasticsearch ILM vs OpenSearch IAM/ISM) with comprehensive tests and docs to ensure functionality across both engines while preserving backward compatibility. Implemented engine property handling to convert engine values from string to keyword, enabling ductile and CTIA to interoperate with OpenSearch without production config changes. Added end-to-end OpenSearch integration tests (2.x and 3.x) validating connection, index creation, alias setup, dynamic settings updates, and ILM→ISM policy transformation; all 26 assertions passing. Created CTIA initialization tests for OpenSearch, covering configuration loading, engine conversion, and multi-engine readiness. Built multi-engine testing support (CTIA_TEST_ENGINES) to run tests against Elasticsearch and OpenSearch 2.x/3.x in CI, including docker-compose services for OpenSearch versions and a matrix expansion in CI jobs. Upgraded and pinned ductile to stable 0.6.0, aligning with lifecycle API migration, and updated CI to include explicit ductile lifecycle usage. Documentation and testing coverage improvements: OPENSEARCH_TESTING.md added; OPENSEARCH_MIGRATION.md removed as integration is now direct; tests updated to reflect multi-engine workflows. Business value: reduces migration risk for customers moving to OpenSearch, validates cross-engine compatibility, improves reliability and deployment confidence, accelerates time-to-value in multi-engine environments, and strengthens CI coverage to prevent regressions before production deployment.
December 2025
November 2025
1 Commits
Nov 1, 2025November 2025: Stabilized incident lifecycle data for threatgrid/ctia by fixing preservation of incident_time timestamps across status transitions within the same category for both POST and PATCH endpoints. The fix ensures :closed and :opened timestamps reflect when an incident first entered their respective categories, with correct handling for Open: Contained. This resolves inconsistencies in metrics and interval calculations (new_to_opened, opened_to_closed, new_to_contained), enabling more reliable dashboards, SLA reporting, and data integrity across the API surface.
November 2025
1 Commits
Nov 1, 2025November 2025: Stabilized incident lifecycle data for threatgrid/ctia by fixing preservation of incident_time timestamps across status transitions within the same category for both POST and PATCH endpoints. The fix ensures :closed and :opened timestamps reflect when an incident first entered their respective categories, with correct handling for Open: Contained. This resolves inconsistencies in metrics and interval calculations (new_to_opened, opened_to_closed, new_to_contained), enabling more reliable dashboards, SLA reporting, and data integrity across the API surface.
October 2025
2 Commits • 2 Features
Oct 1, 2025Month: 2025-10 — threatgrid/ctia. This period focused on governance improvements and consistent workflow enhancements that strengthen security posture and operational accuracy. Key features delivered: 1) Code Ownership Governance Update: added @samwagg to global CODEOWNERS for all files to improve governance and ownership clarity. Commit: 21aca7fdbd176c2b1a4d3bb310d36ed7db308b3d. 2) Incident Management: PATCH route parity with POST status-change logic and Hold-to-Closed transition to improve time tracking and ensure explicit timestamps override auto-generated ones. Commit: 70b234c0b5ff5e6a491898f13e0d10611757b891.
2 Commits • 2 Features
Oct 1, 2025Month: 2025-10 — threatgrid/ctia. This period focused on governance improvements and consistent workflow enhancements that strengthen security posture and operational accuracy. Key features delivered: 1) Code Ownership Governance Update: added @samwagg to global CODEOWNERS for all files to improve governance and ownership clarity. Commit: 21aca7fdbd176c2b1a4d3bb310d36ed7db308b3d. 2) Incident Management: PATCH route parity with POST status-change logic and Hold-to-Closed transition to improve time tracking and ensure explicit timestamps override auto-generated ones. Commit: 70b234c0b5ff5e6a491898f13e0d10611757b891.
October 2025
November 2024
3 Commits • 2 Features
Nov 1, 2024Concise monthly summary for 2024-11 focusing on threatgrid/ctia. This period delivered focused functionality enhancements and governance improvements with no major bug fixes required.
November 2024
3 Commits • 2 Features
Nov 1, 2024Concise monthly summary for 2024-11 focusing on threatgrid/ctia. This period delivered focused functionality enhancements and governance improvements with no major bug fixes required.
Activity
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Quality Metrics
Correctness97.2%
Maintainability85.4%
Architecture87.2%
Performance85.4%
AI Usage34.6%
Skills & Technologies
Programming Languages
ClojureYAML
Technical Skills
API DevelopmentAPI developmentBackend DevelopmentClojureCode Ownership ManagementDependency ManagementDevOpsElasticsearchIncident ManagementOpenSearchback end developmentbackend developmentconcurrent programmingperformance optimizationtesting
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