Informatievlaanderen/association-registry
Nov 2024 – Feb 2026
16 Months active
Languages Used
C#JSONJavaScriptPythonSQLShellXMLyaml
Technical Skills
.NETAPI DevelopmentAPI IntegrationAutoFixtureBackend DevelopmentCQRS
Koen Metsu
PROFILE
Koen Metsu
Koen Metsu contributed to the Informatievlaanderen/association-registry repository by delivering robust backend features focused on data integrity, observability, and maintainability. Over 16 months, he engineered solutions for GDPR-compliant data migrations, event-driven synchronization, and modular domain logic, using C#, .NET, and Docker. Koen refactored core components to support clean architecture, enhanced command traceability with selective logging, and stabilized CI/CD pipelines for reliable deployments. His work included integrating AWS Lambda and OpenTelemetry for scalable messaging and monitoring, while improving test coverage and database migration tooling. The depth of his contributions ensured resilient, auditable workflows and streamlined future development across the platform.
Overall Statistics
Feature vs Bugs
65%Features
Repository Contributions
433Total
Bugs
55
Commits
433
Features
104
Lines of code
114,578
Activity Months16
Your Network
4 peopleShared Repositories
4
Work History
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for Informatievlaanderen/association-registry: Delivered enhanced command logging and traceability to improve debugging, monitoring, and audit-readiness. Implemented selective logging of command records and introduced PrintMembers formatting to capture key properties of command objects, enhancing traceability of command execution. Resolved OR-3018 related issue to enable selective logging and strengthen observability. No other major defects reported this month; this work lays the foundation for quicker root-cause analysis and improved operational visibility.
1 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary for Informatievlaanderen/association-registry: Delivered enhanced command logging and traceability to improve debugging, monitoring, and audit-readiness. Implemented selective logging of command records and introduced PrintMembers formatting to capture key properties of command objects, enhancing traceability of command execution. Resolved OR-3018 related issue to enable selective logging and strengthen observability. No other major defects reported this month; this work lays the foundation for quicker root-cause analysis and improved operational visibility.
February 2026
January 2026
27 Commits • 4 Features
Jan 1, 2026January 2026 monthly summary for Informatievlaanderen/association-registry focusing on delivering robust data synchronization features, reliability improvements, and architectural refinements that enable scalable, maintainable operations across KBO and address domains. The month emphasized business value through improved data accuracy, reduced failure modes, and streamlined deployment/test workflows.
January 2026
27 Commits • 4 Features
Jan 1, 2026January 2026 monthly summary for Informatievlaanderen/association-registry focusing on delivering robust data synchronization features, reliability improvements, and architectural refinements that enable scalable, maintainable operations across KBO and address domains. The month emphasized business value through improved data accuracy, reduced failure modes, and streamlined deployment/test workflows.
December 2025
27 Commits • 6 Features
Dec 1, 2025December 2025 monthly summary for Informatievlaanderen/association-registry. Focused on migration stabilization, robust integration work, and improved reliability and observability across KBO sync and registraties-inschrijvingen workflows.
27 Commits • 6 Features
Dec 1, 2025December 2025 monthly summary for Informatievlaanderen/association-registry. Focused on migration stabilization, robust integration work, and improved reliability and observability across KBO sync and registraties-inschrijvingen workflows.
December 2025
November 2025
7 Commits • 3 Features
Nov 1, 2025Monthly summary for 2025-11 (Informatievlaanderen/association-registry). Key features delivered: - GDPR data privacy migration and startup data seeding: Seed test data on application startup and GDPR migration script to separate personal data from events, improving compliance and testing coverage. Commits include 8cc875bd74205d0fa24a2d3b268d483b639c8331; a6f6dae6c671a121e470223ecb92b236b0fc6282. - Representative event handling and personal data separation: New structure for removal of representatives, personal data separation, and upcasters for event processing with updates to event migration and projection to reflect presence/absence of personal data. Commits include fcb68584365bc709268687a2799553c5c0001d8d; 3a12310489ef028eb2e0091934958b45968c1a4c. - Bewaartermijn (retention period) for removed representatives: New command to initiate a retention period and handler for starting bewaartermijn, including a new message type and related tracking events. Commits include 0eca0caf5affac1f06b847f221a06f8af74e2229; cb46bf933a884a3339e79d5d9740a467e6e26ed6. - SQL migration typo fix: Fixed a typo in SQL migration script related to event types for representatives to ensure accurate data handling. Commit aaaf3d30790bc7f58ed37ce7918f83e49d6bd5b8.
November 2025
7 Commits • 3 Features
Nov 1, 2025Monthly summary for 2025-11 (Informatievlaanderen/association-registry). Key features delivered: - GDPR data privacy migration and startup data seeding: Seed test data on application startup and GDPR migration script to separate personal data from events, improving compliance and testing coverage. Commits include 8cc875bd74205d0fa24a2d3b268d483b639c8331; a6f6dae6c671a121e470223ecb92b236b0fc6282. - Representative event handling and personal data separation: New structure for removal of representatives, personal data separation, and upcasters for event processing with updates to event migration and projection to reflect presence/absence of personal data. Commits include fcb68584365bc709268687a2799553c5c0001d8d; 3a12310489ef028eb2e0091934958b45968c1a4c. - Bewaartermijn (retention period) for removed representatives: New command to initiate a retention period and handler for starting bewaartermijn, including a new message type and related tracking events. Commits include 0eca0caf5affac1f06b847f221a06f8af74e2229; cb46bf933a884a3339e79d5d9740a467e6e26ed6. - SQL migration typo fix: Fixed a typo in SQL migration script related to event types for representatives to ensure accurate data handling. Commit aaaf3d30790bc7f58ed37ce7918f83e49d6bd5b8.
October 2025
2 Commits • 1 Features
Oct 1, 2025Month: 2025-10 — Informatievlaanderen/association-registry Key deliverables and impact: - Delivered a targeted refactor to improve maintainability: extracted the KBO diff calculation into a dedicated class VertegenwoordigersKboDiff, enabling clearer domain logic and easier testing. - Ensured data integrity during migrations: fixed Anonymous Type Migration in mt_events by reclassifying events to the correct event type and .NET type, preventing potential data inconsistencies in event handling. - Strengthened code quality and future readiness: accompanying refactor (or-2876) included cleanup to improve readability and set the stage for upcoming enhancements. Overall impact: - Reduced risk in data migrations and improved maintainability of KBO-related logic, contributing to more reliable deployments and faster onboarding for new team members. Technologies/skills demonstrated: - C#, .NET, refactoring, class design, and code organization; emphasis on maintainability, testability, and clear domain boundaries; disciplined commit messages and traceability.
2 Commits • 1 Features
Oct 1, 2025Month: 2025-10 — Informatievlaanderen/association-registry Key deliverables and impact: - Delivered a targeted refactor to improve maintainability: extracted the KBO diff calculation into a dedicated class VertegenwoordigersKboDiff, enabling clearer domain logic and easier testing. - Ensured data integrity during migrations: fixed Anonymous Type Migration in mt_events by reclassifying events to the correct event type and .NET type, preventing potential data inconsistencies in event handling. - Strengthened code quality and future readiness: accompanying refactor (or-2876) included cleanup to improve readability and set the stage for upcoming enhancements. Overall impact: - Reduced risk in data migrations and improved maintainability of KBO-related logic, contributing to more reliable deployments and faster onboarding for new team members. Technologies/skills demonstrated: - C#, .NET, refactoring, class design, and code organization; emphasis on maintainability, testability, and clear domain boundaries; disciplined commit messages and traceability.
October 2025
September 2025
22 Commits • 3 Features
Sep 1, 2025September 2025 focused on delivering migration tooling, stabilizing CI/CD, and extending admin API capabilities for Informatievlaanderen/association-registry. Key work includes container-based migration management, an automated migration generator, environment-variable-driven configuration for connections, and robustness improvements across admin projections, duplicate handling, and error paths. These efforts reduced deployment friction, improved data governance, and enhanced observability through Power BI reporting.
September 2025
22 Commits • 3 Features
Sep 1, 2025September 2025 focused on delivering migration tooling, stabilizing CI/CD, and extending admin API capabilities for Informatievlaanderen/association-registry. Key work includes container-based migration management, an automated migration generator, environment-variable-driven configuration for connections, and robustness improvements across admin projections, duplicate handling, and error paths. These efforts reduced deployment friction, improved data governance, and enhanced observability through Power BI reporting.
August 2025
46 Commits • 10 Features
Aug 1, 2025In August 2025, the team delivered a major architectural overhaul in the association registry and strengthened stability and observability across the board. A comprehensive clean-architecture and modularization effort under or-2894 restructured core boundaries (webapi dir, moved eventstore, decoupled command handling, and domain-driven reorganization) to enable scalable development and easier maintenance. The address enrichment logic was refactored under the same initiative, with related rebase fixes and project rename to align with the new structure. CI, observability, and initialization flows were enhanced (or-2890) to improve reliability, logging, and startup sequencing. Telemetry visibility was improved with an API-key enrichment to enable better traceability and authorization (Or-2730). Or-2901-related work delivered DLQ endpoint mappings and JasperFX scaffolding, plus stabilization improvements such as resilient Slack notifications and reduced e2e flakiness through adjusted waits and retries. In addition, targeted bug fixes were completed (e.g., extension folder responsibility split, removal of intermediary listeners) and CI workflow fixes implemented (or-2687).
46 Commits • 10 Features
Aug 1, 2025In August 2025, the team delivered a major architectural overhaul in the association registry and strengthened stability and observability across the board. A comprehensive clean-architecture and modularization effort under or-2894 restructured core boundaries (webapi dir, moved eventstore, decoupled command handling, and domain-driven reorganization) to enable scalable development and easier maintenance. The address enrichment logic was refactored under the same initiative, with related rebase fixes and project rename to align with the new structure. CI, observability, and initialization flows were enhanced (or-2890) to improve reliability, logging, and startup sequencing. Telemetry visibility was improved with an API-key enrichment to enable better traceability and authorization (Or-2730). Or-2901-related work delivered DLQ endpoint mappings and JasperFX scaffolding, plus stabilization improvements such as resilient Slack notifications and reduced e2e flakiness through adjusted waits and retries. In addition, targeted bug fixes were completed (e.g., extension folder responsibility split, removal of intermediary listeners) and CI workflow fixes implemented (or-2687).
August 2025
July 2025
19 Commits • 5 Features
Jul 1, 2025July 2025 – Key delivery and stability improvements across the association-registry project. Implemented duplicate detection middleware during registration with enriched location data, enabled search result ranking by Elasticsearch _score, enhanced event store existence checks with KBO data, advanced MartenDb projection hosting and subscription management (with improved retries and logging), and stabilized CI/CD/build pipelines for more reliable releases.
July 2025
19 Commits • 5 Features
Jul 1, 2025July 2025 – Key delivery and stability improvements across the association-registry project. Implemented duplicate detection middleware during registration with enriched location data, enabled search result ranking by Elasticsearch _score, enhanced event store existence checks with KBO data, advanced MartenDb projection hosting and subscription management (with improved retries and logging), and stabilized CI/CD/build pipelines for more reliable releases.
June 2025
30 Commits • 6 Features
Jun 1, 2025June 2025 performance summary for Informatievlaanderen/association-registry: Delivered feature-rich geotag enhancements, improved admin search capabilities, and strengthened system reliability through health checks and telemetry. Implemented precise geotag calculations for werkingsgebieden, added JSON-LD for vcodes and isDubbelVan, standardized session defaults, and reduced log noise. Consolidated CI naming and stabilized tests to reduce maintenance overhead and improve developer velocity. These changes deliver improved data accuracy, faster admin workflows, better observability, and more resilient deployments.
30 Commits • 6 Features
Jun 1, 2025June 2025 performance summary for Informatievlaanderen/association-registry: Delivered feature-rich geotag enhancements, improved admin search capabilities, and strengthened system reliability through health checks and telemetry. Implemented precise geotag calculations for werkingsgebieden, added JSON-LD for vcodes and isDubbelVan, standardized session defaults, and reduced log noise. Consolidated CI naming and stabilized tests to reduce maintenance overhead and improve developer velocity. These changes deliver improved data accuracy, faster admin workflows, better observability, and more resilient deployments.
June 2025
May 2025
43 Commits • 14 Features
May 1, 2025For May 2025, Informatievlaanderen/association-registry delivered critical concurrency fixes, enhanced observability, and a set of foundational improvements that improve data integrity, deployment stability, and developer velocity. The team focused on aligning write paths with aggregate version checks, expanding metrics and health signals, and strengthening test infrastructure to support reliable delivery of features across environments.
May 2025
43 Commits • 14 Features
May 1, 2025For May 2025, Informatievlaanderen/association-registry delivered critical concurrency fixes, enhanced observability, and a set of foundational improvements that improve data integrity, deployment stability, and developer velocity. The team focused on aligning write paths with aggregate version checks, expanding metrics and health signals, and strengthening test infrastructure to support reliable delivery of features across environments.
April 2025
25 Commits • 6 Features
Apr 1, 2025April 2025 performance snapshot for Informatievlaanderen/association-registry focusing on delivering business value through observability, API integrity, CI/CD reliability, and domain correctness. The month emphasized stabilizing release pipelines, improving telemetry, and strengthening the Swagger/OpenAPI surface, while extending test coverage for critical domain flows.
25 Commits • 6 Features
Apr 1, 2025April 2025 performance snapshot for Informatievlaanderen/association-registry focusing on delivering business value through observability, API integrity, CI/CD reliability, and domain correctness. The month emphasized stabilizing release pipelines, improving telemetry, and strengthening the Swagger/OpenAPI surface, while extending test coverage for critical domain flows.
April 2025
March 2025
47 Commits • 9 Features
Mar 1, 2025March 2025 (Informatievlaanderen/association-registry): Delivered a major subtype data model refactor and extensive API naming improvements, strengthening data integrity, API clarity, and developer experience. Key outcomes include a renormalized subtype data model (code/name pair) with migration support and admin/search updates; a comprehensive event naming overhaul with fullness descriptors and safety reversions; subtype-aware logic for duplicate checks; Swagger scaffolding to accelerate API documentation; and strengthened test and CI infrastructure including end-to-end tests and projections for Subvereniging refinement. These efforts reduce data ambiguity, improve search accuracy, and shorten onboarding for integrators while stabilizing deployments and CI workflows.
March 2025
47 Commits • 9 Features
Mar 1, 2025March 2025 (Informatievlaanderen/association-registry): Delivered a major subtype data model refactor and extensive API naming improvements, strengthening data integrity, API clarity, and developer experience. Key outcomes include a renormalized subtype data model (code/name pair) with migration support and admin/search updates; a comprehensive event naming overhaul with fullness descriptors and safety reversions; subtype-aware logic for duplicate checks; Swagger scaffolding to accelerate API documentation; and strengthened test and CI infrastructure including end-to-end tests and projections for Subvereniging refinement. These efforts reduce data ambiguity, improve search accuracy, and shorten onboarding for integrators while stabilizing deployments and CI workflows.
February 2025
35 Commits • 10 Features
Feb 1, 2025February 2025 monthly summary for Informatievlaanderen/association-registry focused on strengthening test quality, stabilizing E2E workflows, advancing search capabilities, and delivering data integrity improvements. Key architectural and testing improvements were implemented to accelerate delivery while reducing risk in production deployments.
35 Commits • 10 Features
Feb 1, 2025February 2025 monthly summary for Informatievlaanderen/association-registry focused on strengthening test quality, stabilizing E2E workflows, advancing search capabilities, and delivering data integrity improvements. Key architectural and testing improvements were implemented to accelerate delivery while reducing risk in production deployments.
February 2025
January 2025
47 Commits • 9 Features
Jan 1, 2025January 2025 — Informatievlaanderen/association-registry: focus on data integrity for vereniging duplicates, maintainability through refactors, enhanced testing, and deployment observability. Delivered Or-1716 dubbelbeheer and vereniging processing improvements; completed core refactor to separate concerns and clean project structure; advanced duplicate detection with admin endpoint and end-to-end tests; relocated KBO sync lambda into the association-registry with improved packaging, defaults, and data publishing; added observability, tracing, and logging with configuration-driven setup; implemented CI workflow improvements and targeted reliability fixes. This work reduces duplicate risks, improves end-user data quality, and accelerates safe deployment and testing cycles.
January 2025
47 Commits • 9 Features
Jan 1, 2025January 2025 — Informatievlaanderen/association-registry: focus on data integrity for vereniging duplicates, maintainability through refactors, enhanced testing, and deployment observability. Delivered Or-1716 dubbelbeheer and vereniging processing improvements; completed core refactor to separate concerns and clean project structure; advanced duplicate detection with admin endpoint and end-to-end tests; relocated KBO sync lambda into the association-registry with improved packaging, defaults, and data publishing; added observability, tracing, and logging with configuration-driven setup; implemented CI workflow improvements and targeted reliability fixes. This work reduces duplicate risks, improves end-user data quality, and accelerates safe deployment and testing cycles.
December 2024
29 Commits • 5 Features
Dec 1, 2024December 2024 monthly summary for Informatievlaanderen/association-registry: Delivered a domain-driven refactor of LocatieFinder, migrating concepts into the domain, improving structure, routing, and registrations, backed by tests. Implemented dynamic routing on the same queue via a wrapper event, and reorganized commands/handlers into actions to improve maintainability. Fixed critical data serialization for gemeentenaam to ensure value-only representation. Strengthened Elastic client testing with corrected scenarios and scaffolding. Added metrics instrumentation for Marten/Wolverine to improve observability. Expanded Vereniging handling for or-2334/2335 with validations, DLQ coverage, and test project enhancements. These changes deliver clearer domain boundaries, safer routing, improved data integrity, and enhanced monitoring, supporting reliability and faster future iterations.
29 Commits • 5 Features
Dec 1, 2024December 2024 monthly summary for Informatievlaanderen/association-registry: Delivered a domain-driven refactor of LocatieFinder, migrating concepts into the domain, improving structure, routing, and registrations, backed by tests. Implemented dynamic routing on the same queue via a wrapper event, and reorganized commands/handlers into actions to improve maintainability. Fixed critical data serialization for gemeentenaam to ensure value-only representation. Strengthened Elastic client testing with corrected scenarios and scaffolding. Added metrics instrumentation for Marten/Wolverine to improve observability. Expanded Vereniging handling for or-2334/2335 with validations, DLQ coverage, and test project enhancements. These changes deliver clearer domain boundaries, safer routing, improved data integrity, and enhanced monitoring, supporting reliability and faster future iterations.
December 2024
November 2024
26 Commits • 12 Features
Nov 1, 2024November 2024 (2024-11) monthly summary for Informatievlaanderen/association-registry focusing on delivering business value through Lidmaatschappen enhancements, data accuracy improvements, BI-ready integrations, and stronger data interoperability. The month combined feature delivery with reliability improvements and test fixture stabilization to support ongoing velocity.
November 2024
26 Commits • 12 Features
Nov 1, 2024November 2024 (2024-11) monthly summary for Informatievlaanderen/association-registry focusing on delivering business value through Lidmaatschappen enhancements, data accuracy improvements, BI-ready integrations, and stronger data interoperability. The month combined feature delivery with reliability improvements and test fixture stabilization to support ongoing velocity.
Activity
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Quality Metrics
Correctness89.2%
Maintainability88.8%
Architecture85.6%
Performance80.2%
AI Usage20.8%
Skills & Technologies
Programming Languages
BashC#C++CSVDockerDockerfileGoJSONJavaJavaScript
Technical Skills
.NET.NETAPI DesignAPI DevelopmentAPI DocumentationAPI IntegrationAPI Integration TestingAPI TestingAPI VersioningAPI developmentAPI integrationASP.NET CoreAWSAWS LambdaAWS SDK
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline