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Mathias S. Müller

PROFILE

Mathias S. Müller

Over 15 months, contributed to navikt/veilarbvedtaksstotte and navikt/pto-admin by building robust backend features, modernizing CI/CD pipelines, and enhancing data reliability. Delivered solutions for automated decision distribution, BigQuery analytics integration, and self-assessment workflows, using Java, Kotlin, and SQL within Spring Boot environments. Improved system observability and error handling through logging, alerting, and retry mechanisms, while refactoring codebases for maintainability and production readiness. Upgraded infrastructure and frontend stacks in pto-admin, leveraging React, TypeScript, and Node.js. Focused on automation, configuration management, and test coverage, enabling faster, safer releases and supporting business-critical workflows across cloud and on-premises deployments.

Overall Statistics

Feature vs Bugs

84%Features

Repository Contributions

136Total
Bugs
8
Commits
136
Features
43
Lines of code
19,954
Activity Months15

Work History

May 2026

26 Commits • 9 Features

May 1, 2026

May 2026 monthly summary for navikt/pto-admin. Focused on delivering business value through UI polish, architecture cleanup, and stack modernization. Key deliveries included frontend UI and build improvements (move hentIdenterCard to the top, repo-wide Prettier alignment, and upgrade to Vite v8 with the React plugin), removal of obsolete kafka-admin-panel, ClaudePilot bundle size optimizations with lazy imports/code splitting and a type fix, broad dependency/tooling upgrades (TypeScript 6, Kotlin 2.3.21, OkHttp 5, Spring Boot v3, Gradle v9, internal Nav deps; removal of pnpm-lock; backend patch bumps), and CI/CD workflow enhancements (pinned actions, Node bump, removal of unnecessary permissions, restoration of release creation permission). Additional testing improvements include adding the most critical tests and fixing the test setup. Overall impact: faster release cadence, improved performance and maintainability, reduced maintenance surface, and strengthened security posture through Netty BOM updates. Technologies/skills demonstrated: React, Vite, TypeScript, Kotlin, Spring Boot, Gradle, CI/CD pipelines, code splitting and lazy loading, and test automation.

March 2026

8 Commits • 3 Features

Mar 1, 2026

Monthly summary for 2026-03 (navikt/pto-admin): Focused on delivering core data replication enhancements, API integrations, and stability improvements that reduce local development crashes and improve operator visibility. Key features delivered include: 1) User Data Republishing Enhancements: added per-user republish endpoint by birth number, bulk republish endpoint, and monitoring for republish operations (commits include 90385f649d5159365951436159302c9d9ff0c818, b5f8618ee3e9b7b7188732b55d2fdd0a582e3727, 1eee4c51fa644cf9e692941d63d14f7efc713188). 2) Veilarbarena Integration & Admin API Improvements: token exchange with Veilarbarena, external host configuration, and updating the admin API URL to the new on-prem endpoint (commits 18d498bfedaef43fe2a9e0551e8db4485e740c20, 49e6d0be6d1b6df8cc84dc9eb9782980399c9d61, 87b9e26cf1e41f39044cada48cb2986bed3bd208). 3) Stability & Development Environment Enhancements: dependency upgrades for stability/performance and mock API endpoints with improved error handling to reduce local crashes (commits 31c10de6910e442de7ef2740261f02fc6cd88e9f, 2f928eb56e382a739b379c536c0e25f898a51601).

February 2026

7 Commits • 6 Features

Feb 1, 2026

February 2026: Key deliverables across two repos focused on deployment efficiency, UX clarity, feature-flag modernization, and architectural simplification. - CI/CD and deployment: Updated GitHub Actions workflow for GitHub Pages with newer actions, removed unused workflows, and aligned Node.js versions (commits 82eda9e228639ecf1d716c1215003cec3a72e0e5, e0118a0c1b0107f91b311f672edbb260bcf23cf2). - UX/feature visibility: Made the 'bytt kontor' button visible only in production mocks to reduce confusion during testing (commit b826aa5cdd185e1d011aca9cba9fddfb684fd321). - Feature flag modernization: Deprecated VIS_NY_INNGANG_TIL_ARBEIDSRETTET_OPPFOLGING and introduced EKSEMPELTOGGLE (commit f277502b73f67ce2186ed24eb556e1b8e8862d6e). - Unleash API upgrade: Migrated to a new Unleash API endpoint/version for improved feature flag management (commit a71a7682aad2d5d1498026188277fef34e58175b). - Backend cleanup and reliability: Deprecated aia-backend and added OyeblikksbildeService snapshot tests to improve data reliability (commits 5a4b9a782fb659cf0612b573acf2dbe213a04bd7, 4680ff294ebb3d8b28824bf734031f3d94545c82).

December 2025

14 Commits • 1 Features

Dec 1, 2025

Month 2025-12: Delivered end-to-end Egenvurdering Self-Assessment System enhancements for navikt/veilarbvedtaksstotte, focusing on robust persistence, V2 data model, PDF generation, retrieval, and dialog integration. Implemented dual-DTO support for retrieval (EGENVURDERING and EGENVURDERING_V2), production-environment readiness, and cleanup of test endpoints. Strengthened reliability with null-safety, enhanced logging, and guards around dialog-id flows. 14 commits across the feature set modernized the self-assessment lifecycle and improved data integrity for downstream decisioning.

November 2025

13 Commits • 4 Features

Nov 1, 2025

Monthly summary for 2025-11: Delivered four major features for navikt/veilarbvedtaksstotte, with targeted improvements in monitoring, data integrity, API integration, and time handling. Implementations and refactors were accompanied by a strong focus on business value: faster and safer decision distribution, more reliable data, and a cleaner, Kotlin-based repository. Highlights include new alerting for unprocessed decisions and the removal of an alert that could block new decisions, a Kilde UUID schema upgrade with automatic UUIDs and a primary key migration, an API integration scaffold for arbeidssoekerregisteret (including a dummy client and error-logging enhancements), and standardizing date-time handling to LocalDateTime.

October 2025

12 Commits • 2 Features

Oct 1, 2025

2025-10 monthly summary for navikt/veilarbvedtaksstotte. Focused on reliability, automation, and code quality to improve distribution of vedtak (decisions) and strengthen CI/CD. Delivered a robust retry mechanism for vedtak distribution with a retry table, new repository, and scheduling enhancements to cope with transient failures; added timestamps, limits, and scheduling tweaks to ensure reliable distribution even after temporary outages. Implemented daily scheduled distribution of vedtak, migration V45, and support for future debugging with date-columns. Strengthened testing, CI/CD reliability, and code quality through updated test utilities and container images, post-merge refactors, and SonarCloud improvements. These changes reduce failure to deliver vedtak, shorten recovery time, and boost developer velocity. Key business outcomes include improved reliability and observability for decision distribution, reduced manual intervention in failure scenarios, and a more stable release pipeline that accelerates time-to-value for customer-facing features.

September 2025

3 Commits • 2 Features

Sep 1, 2025

September 2025 (2025-09) monthly summary for navikt/pto-admin: Delivered essential platform stability improvements and infrastructure alignment. Upgraded dependencies to latest stable versions to enhance security, performance, and compatibility, and standardized Dockerfile style for maintainability. Migrated login URLs to internal infrastructure, updating endpoints to reflect intern.dev.nav.no and intern.nav.no in login-check.tsx, reducing external dependencies and ensuring consistent authentication routing.

June 2025

11 Commits • 2 Features

Jun 1, 2025

June 2025 monthly summary focusing on key accomplishments and business value for navikt/veilarbvedtaksstotte. Highlights include the Dokdistkanal distribution integration with multi-channel support, a refactored and improved resending workflow for saksstatistikk, and targeted bug fixes to improve reliability and data integrity. Deliveries were implemented with production readiness in mind and demonstrated strong collaboration across commits to production config, client integration, and testing utilities.

May 2025

9 Commits • 2 Features

May 1, 2025

May 2025 monthly summary for navikt/veilarbvedtaksstotte. Focused on delivering data reliability, automation, and observability for SakStatistikk processing. Implemented batch insertion of SakStatistikk data into BigQuery, including resending of AVBRUTT statistics and status updates to AVSLUTTET/AVBRUTT, accompanied by tests and configuration setup. Introduced a production-only resending cron with logging and adjusted timing to ensure safe execution in production. Overall, these efforts improved data timeliness and consistency in BigQuery while reducing manual intervention through automation. Maintained code quality and test reliability across changes to support robust production operations.

March 2025

12 Commits • 4 Features

Mar 1, 2025

March 2025: Delivered key features and urgent fixes for navikt/veilarbvedtaksstotte, focusing on data integrity, document accuracy, and maintainability. Implementations emphasize business value through streamlined data workflows, accurate document composition, and reduced technical debt.

February 2025

4 Commits • 2 Features

Feb 1, 2025

February 2025 monthly summary for navikt/veilarbvedtaksstotte focused on delivering analytics-ready data foundations and reducing technical debt. Key features delivered include BigQuery-backed Vedtak Statistics storage and decommissioning of an obsolete application, with alignment to domain models and storage schema.

January 2025

2 Commits • 2 Features

Jan 1, 2025

January 2025 (2025-01) monthly summary for navikt/veilarbvedtaksstotte. Key features delivered include automated PR labeling for non-Dependabot PRs and a type-safe SakStatistikk domain with enums and removal of behandlingUuid. No major bugs fixed this month. Impact: improved PR organization, higher data integrity, and streamlined analytics pipelines. Technologies/skills demonstrated: GitHub Actions for CI/CD automation and labeling, labeler configuration, enum-based domain modeling, and database/BigQuery updates for SakStatistikk.

December 2024

4 Commits • 2 Features

Dec 1, 2024

Month: 2024-12 | Concise monthly summary for navikt/veilarbvedtaksstotte focusing on business value and technical achievements. - Key features delivered: Schema enhancement for SAK_STATISTIKK to support related-system linkage and auditing; setup of a dedicated BigQuery testing infrastructure for sak_statistikk to enable robust validation. - Major bugs fixed: No major production incidents reported during the period. - Overall impact and accomplishments: Improved data model clarity, better cross-system integration readiness, and a scalable testing foundation; increased data accessibility for related systems and stronger foundation for future analytics. - Technologies/skills demonstrated: Data modeling, schema evolution, database provisioning, BigQuery data testing, cross-team collaboration, and change validation.

November 2024

9 Commits • 2 Features

Nov 1, 2024

November 2024 summary for navikt/veilarbvedtaksstotte focusing on stabilizing release processes and optimizing production costs. Key outcomes include CI/CD pipeline modernization aligned to the main branch, gating production deploys on successful development deploys, standardizing workflow configurations, fixing artifact references, and tightening production deployment permissions and release actions. In parallel, Production Database Resource Tuning adjusted CPU/RAM and instance tiers, validated resource values, and tested potential further reductions. Together, these efforts reduced deployment risk, improved release velocity, and delivered cost-efficiency without compromising performance.

October 2024

2 Commits

Oct 1, 2024

Monthly summary for 2024-10 focused on delivering targeted improvements to the navikt/veilarbvedtaksstotte backend, with emphasis on simplifying Kafka-based scheduling and consolidating configuration management.

Activity

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Quality Metrics

Correctness91.2%
Maintainability89.2%
Architecture88.0%
Performance85.8%
AI Usage23.2%

Skills & Technologies

Programming Languages

BatchfileCSSDockerfileJSONJavaJavaScriptKotlinMarkdownSQLShell

Technical Skills

API DevelopmentAPI IntegrationAPI developmentAPI integrationAlertingAutomationBackend DevelopmentBigQueryCI/CDClient ImplementationCloudCloud ConfigurationCloud InfrastructureCloud ServicesCode Refactoring

Repositories Contributed To

3 repos

Overview of all repositories you've contributed to across your timeline

navikt/veilarbvedtaksstotte

Oct 2024 Feb 2026
12 Months active

Languages Used

JavaKotlinyamlYAMLSQLMarkdownkotlinproperties

Technical Skills

Backend DevelopmentCron JobsDevOpsFeature TogglesInfrastructure as CodeJava

navikt/pto-admin

Sep 2025 May 2026
3 Months active

Languages Used

DockerfileJavaScriptShellTypeScriptJSONKotlinYAMLBatchfile

Technical Skills

ContainerizationDependency ManagementDevOpsFront End DevelopmentFull Stack DevelopmentNode.js

navikt/veilarbvisittkortfs

Feb 2026 Feb 2026
1 Month active

Languages Used

JavaScriptTypeScriptYAML

Technical Skills

CI/CDDevOpsGitHub ActionsNode.jsReactTypeScript