
Mats Jun Larsen engineered robust backend and frontend systems for the dotkom/monoweb repository, focusing on authentication, payments, observability, and developer workflow modernization. He delivered features such as OAuth2-based authentication, policy-driven authorization middleware, and a PostgreSQL-backed task executor, while also improving payment flows and transactional integrity. Mats refactored core services, migrated to modern TypeScript and React patterns, and enhanced deployment pipelines using Docker and GitHub Actions. His work emphasized maintainability and security, consolidating configuration and access control, and introducing OpenTelemetry-based tracing. Through iterative upgrades and targeted bug fixes, Mats ensured platform reliability, streamlined developer experience, and aligned business logic with organizational needs.
February 2026 highlights across dotkom/monoweb and dotkom/wiki focused on UX improvements, authentication reliability, and maintenance simplification to drive business value and platform stability. Delivered user-centric features, stabilized core auth flows, and reduced technical debt while enhancing deployment visibility and governance communications.
February 2026 highlights across dotkom/monoweb and dotkom/wiki focused on UX improvements, authentication reliability, and maintenance simplification to drive business value and platform stability. Delivered user-centric features, stabilized core auth flows, and reduced technical debt while enhancing deployment visibility and governance communications.
January 2026 highlights for dotkom/monoweb: privacy enhancements with search-index shielding, a PostgreSQL-backed, single-threaded task executor replacing external queues for improved reliability, and production readiness with staging removal. Supplemented by DevOps hygiene (Dockerfile consistency, CodeQL removal), improved observability (membership query logs) and code quality fixes, plus experimentation with authentication flow toggles. These changes reduce deploy risk, improve data privacy posture, and deliver more predictable runtime behavior and faster iteration cycles.
January 2026 highlights for dotkom/monoweb: privacy enhancements with search-index shielding, a PostgreSQL-backed, single-threaded task executor replacing external queues for improved reliability, and production readiness with staging removal. Supplemented by DevOps hygiene (Dockerfile consistency, CodeQL removal), improved observability (membership query logs) and code quality fixes, plus experimentation with authentication flow toggles. These changes reduce deploy risk, improve data privacy posture, and deliver more predictable runtime behavior and faster iteration cycles.
December 2025 (dotkom/monoweb) focused on strengthening access control, domain terminology alignment, and system stability to deliver measurable business value while improving developer productivity. Key features delivered include enabling payments for users deregistered via the deregistration flow, standardizing domain terminology by renaming Affiliation to EditorRole, and adopting a predicate-based authorization middleware to enforce policy-as-code across routers. The work also includes broad migration of routers to the new Authorization Middlewares, consolidating authorization logic and reducing duplication. Additional improvements include re-exporting routers as namespaces for simpler imports and providing a local development escape hatch to accelerate testing of the authorization system. Finally, targeted cleanup and dependency upgrades were completed to reduce technical debt and improve stability. Top achievements for December 2025: - Payments for deregistration feature delivered (commit d251ff696b80057602146b2b6c050e9b8d740d37) - Authorization middleware adoption across routers with predicate-based logic and shared middleware improvements (commits including f9ed024c8895dfa2f282b0dd4dd0c3390f06fed5 and 1f0b9cd1275743690db2c551c81eb3c92bbc791d, among others) - Migrated PersonalMarkRouter, FeedbackFormRouter, EventRouter and AttendanceRouter to Authorization Middlewares (commits 9d542d8fbb861aa4059e8c01eb7ba5147e250837, 9615686a1cf602243da6a74c0ca480f1a520ce82, eb40082b3962119b135650b854c1f99947cee2c9, 9fe0dfe57d3ccd839f4c5833ec6f3b587cd884cb) - Router Namespace re-exports to simplify imports (commit fa128876054d24f99f16fa11581c39431366f7e8) - Dependency upgrades and stabilization, including Biome 2.x upgrade and adding jsdom as a direct dependency for rif and invoicification (commits 1686f3c21f9605a9fd81281890732e97d07da74c and 9a0d0592ce410c5ea23d98330f1e716740e9fc40) Impact and value: - Strengthened security and compliance with centralized, policy-as-code authorization across services, reducing risk in access control and enabling scalable onboarding for future routers. - Improved maintainability and developer velocity through standardized terminology, middleware-based auth, and namespace exports. - Reduced technical debt via cleanup of legacy transaction handlers, removal of downstream auth dependencies, and streamlined CI/CD with reinstated GitHub Actions. Technologies/skills demonstrated: - Predicate-based authorization design, composable middlewares, and tRPC context enhancements - Large-scale router migrations and policy enforcement - Domain terminology standardization (Affiliation to EditorRole) - Dependency management and CI/CD stability improvements (Biome 2.x, jsdom, GitHub Actions) - Code cleanup and refactoring to simplify auth flows and improve performance
December 2025 (dotkom/monoweb) focused on strengthening access control, domain terminology alignment, and system stability to deliver measurable business value while improving developer productivity. Key features delivered include enabling payments for users deregistered via the deregistration flow, standardizing domain terminology by renaming Affiliation to EditorRole, and adopting a predicate-based authorization middleware to enforce policy-as-code across routers. The work also includes broad migration of routers to the new Authorization Middlewares, consolidating authorization logic and reducing duplication. Additional improvements include re-exporting routers as namespaces for simpler imports and providing a local development escape hatch to accelerate testing of the authorization system. Finally, targeted cleanup and dependency upgrades were completed to reduce technical debt and improve stability. Top achievements for December 2025: - Payments for deregistration feature delivered (commit d251ff696b80057602146b2b6c050e9b8d740d37) - Authorization middleware adoption across routers with predicate-based logic and shared middleware improvements (commits including f9ed024c8895dfa2f282b0dd4dd0c3390f06fed5 and 1f0b9cd1275743690db2c551c81eb3c92bbc791d, among others) - Migrated PersonalMarkRouter, FeedbackFormRouter, EventRouter and AttendanceRouter to Authorization Middlewares (commits 9d542d8fbb861aa4059e8c01eb7ba5147e250837, 9615686a1cf602243da6a74c0ca480f1a520ce82, eb40082b3962119b135650b854c1f99947cee2c9, 9fe0dfe57d3ccd839f4c5833ec6f3b587cd884cb) - Router Namespace re-exports to simplify imports (commit fa128876054d24f99f16fa11581c39431366f7e8) - Dependency upgrades and stabilization, including Biome 2.x upgrade and adding jsdom as a direct dependency for rif and invoicification (commits 1686f3c21f9605a9fd81281890732e97d07da74c and 9a0d0592ce410c5ea23d98330f1e716740e9fc40) Impact and value: - Strengthened security and compliance with centralized, policy-as-code authorization across services, reducing risk in access control and enabling scalable onboarding for future routers. - Improved maintainability and developer velocity through standardized terminology, middleware-based auth, and namespace exports. - Reduced technical debt via cleanup of legacy transaction handlers, removal of downstream auth dependencies, and streamlined CI/CD with reinstated GitHub Actions. Technologies/skills demonstrated: - Predicate-based authorization design, composable middlewares, and tRPC context enhancements - Large-scale router migrations and policy enforcement - Domain terminology standardization (Affiliation to EditorRole) - Dependency management and CI/CD stability improvements (Biome 2.x, jsdom, GitHub Actions) - Code cleanup and refactoring to simplify auth flows and improve performance
Month: 2025-11 Overview: Delivered targeted front-end refactors and calendar-related UX fixes for dotkom/monoweb, aligned with business needs around membership management and calendar-year renewals. Strengthened code quality and dependency health, while preserving UX clarity and system stability. Key features delivered: - User Service Refactor and Quality Improvements (feature) – Refactored user service to integrate membership service, removed unused repositories, and improved code quality with linting and readability enhancements. Commits include 28bef477f8512f5a6515c10dace8282f40092c1e, b7ebedd00983a6b2b74be104c3998972b5e996c1, and b1bd03e0664b5b0544a6365bc5dcf056a118840b. - Membership Duration Limitation to Next School Year (feature) – Limited memberships to at most one year at a time based on current date and school year start, ensuring renewals align with the school calendar. Commit: 448eca2c00adf4ace7d28839f237f25f14b72f01. Major bugs fixed: - EventCalendarItem Clickability Bug Fix (bug) – Reverted changes that made the entire EventCalendarItem clickable; restored expected behavior where only specific parts are clickable to improve user interaction clarity. Commit: bc2f1f8cecf7faa0562d3834b1a2d92e1a454115. Overall impact and accomplishments: - Improved business alignment: Membership rules now mirror the school calendar, reducing renewal confusion and ensuring compliance. - UX clarity: Interaction behavior on EventCalendarItem is now intuitive, reducing user errors and support queries. - Code quality and maintenance: Lint and readability improvements, removal of dead code paths, and dependency updates (jsdom and isomorphic-dompurify) to enhance security and stability. - Collaboration and traceability: Clear change history with commits and co-authored contributions where applicable. Technologies/skills demonstrated: - Front-end refactor and architecture improvements - Linting, code quality tooling, and readability enhancements - Dependency management and security updates (jsdom, isomorphic-dompurify) - Calendar-aware business logic and membership lifecycle handling
Month: 2025-11 Overview: Delivered targeted front-end refactors and calendar-related UX fixes for dotkom/monoweb, aligned with business needs around membership management and calendar-year renewals. Strengthened code quality and dependency health, while preserving UX clarity and system stability. Key features delivered: - User Service Refactor and Quality Improvements (feature) – Refactored user service to integrate membership service, removed unused repositories, and improved code quality with linting and readability enhancements. Commits include 28bef477f8512f5a6515c10dace8282f40092c1e, b7ebedd00983a6b2b74be104c3998972b5e996c1, and b1bd03e0664b5b0544a6365bc5dcf056a118840b. - Membership Duration Limitation to Next School Year (feature) – Limited memberships to at most one year at a time based on current date and school year start, ensuring renewals align with the school calendar. Commit: 448eca2c00adf4ace7d28839f237f25f14b72f01. Major bugs fixed: - EventCalendarItem Clickability Bug Fix (bug) – Reverted changes that made the entire EventCalendarItem clickable; restored expected behavior where only specific parts are clickable to improve user interaction clarity. Commit: bc2f1f8cecf7faa0562d3834b1a2d92e1a454115. Overall impact and accomplishments: - Improved business alignment: Membership rules now mirror the school calendar, reducing renewal confusion and ensuring compliance. - UX clarity: Interaction behavior on EventCalendarItem is now intuitive, reducing user errors and support queries. - Code quality and maintenance: Lint and readability improvements, removal of dead code paths, and dependency updates (jsdom and isomorphic-dompurify) to enhance security and stability. - Collaboration and traceability: Clear change history with commits and co-authored contributions where applicable. Technologies/skills demonstrated: - Front-end refactor and architecture improvements - Linting, code quality tooling, and readability enhancements - Dependency management and security updates (jsdom, isomorphic-dompurify) - Calendar-aware business logic and membership lifecycle handling
October 2025 for dotkom/monoweb: Delivered observability and diagnostics enhancements, strengthened null-user handling and auditing behavior, tightened CI/CD deployment controls, simplified the build system by removing Turborepo, and tuned background job scheduling. Business value includes improved visibility and faster issue resolution in email workflows (AWS SES/SQS), reduced deployment risk by disabling staging and automatic deployments for kvittering apps, streamlined builds with direct pnpm commands, and conserved resources through longer task intervals. Technologies demonstrated include logging instrumentation and startup diagnostics, robust null handling and guarded queries for user state, CI/CD policy enforcement, Turborepo removal with PNPM-based builds, and background task scheduling optimization.
October 2025 for dotkom/monoweb: Delivered observability and diagnostics enhancements, strengthened null-user handling and auditing behavior, tightened CI/CD deployment controls, simplified the build system by removing Turborepo, and tuned background job scheduling. Business value includes improved visibility and faster issue resolution in email workflows (AWS SES/SQS), reduced deployment risk by disabling staging and automatic deployments for kvittering apps, streamlined builds with direct pnpm commands, and conserved resources through longer task intervals. Technologies demonstrated include logging instrumentation and startup diagnostics, robust null handling and guarded queries for user state, CI/CD policy enforcement, Turborepo removal with PNPM-based builds, and background task scheduling optimization.
September 2025 monthly summary for dotkom/monoweb: Delivered high-impact features, hardened data integrity, and strengthened observability and delivery pipelines. Implemented payment policy enhancements with automatic suspension for overdue payments and a 4.5-day grace period, and cleaned up hardcoded deadlines and initialization logic to reduce edge cases. Improved group governance with seniority-based member sorting, cascade deletions, and corrected affiliation checks. Enhanced user experience and reliability through UI improvements for active job listings, localization/text updates, and comprehensive tracing/error handling, plus a resilient email pipeline via SQS for transactional emails. Upgraded tooling and dependencies to improve developer velocity and security.
September 2025 monthly summary for dotkom/monoweb: Delivered high-impact features, hardened data integrity, and strengthened observability and delivery pipelines. Implemented payment policy enhancements with automatic suspension for overdue payments and a 4.5-day grace period, and cleaned up hardcoded deadlines and initialization logic to reduce edge cases. Improved group governance with seniority-based member sorting, cascade deletions, and corrected affiliation checks. Enhanced user experience and reliability through UI improvements for active job listings, localization/text updates, and comprehensive tracing/error handling, plus a resilient email pipeline via SQS for transactional emails. Upgraded tooling and dependencies to improve developer velocity and security.
2025-08 monthly summary: The month delivered significant improvements across authentication, observability, payments, security, and deployment stability, driving reliability and business value for the dotkom/monoweb repo. Key outcomes include robust Feide authentication/authorization, improved RPC reliability and tracing, streamlined avatar handling, and strengthened security and deployment practices.
2025-08 monthly summary: The month delivered significant improvements across authentication, observability, payments, security, and deployment stability, driving reliability and business value for the dotkom/monoweb repo. Key outcomes include robust Feide authentication/authorization, improved RPC reliability and tracing, streamlined avatar handling, and strengthened security and deployment practices.
July 2025 monthly summary for dotkom/monoweb: Key features delivered: - Rich Text Editor Upgrade: Replaced mdxeditor with Mantine rich editor and deduplicated RichText component to improve editing UX and maintainability. - Renovate bot maintenance and scheduling: Re-enabled Renovate and configured textual/cron-based update schedules to reduce manual dependency maintenance. - Observability and Logging Enhancements: Instrumented core apps with OpenTelemetry, added Sentry release instrumentation, and overhauled logging to Winston with OpenTelemetry-formatted outputs. - Build, Docker, and deployment improvements: Optimized Docker-based Next.js builds, deployed the dashboard as a regular Next.js build, and streamlined startup (disable service-wait during boot) to speed deployments. - Architecture and runner modernization: Migrated monoweb tasks to arm64 runners; introduced task system decoupling (discovery vs execution) and IoC improvements for greater modularity. - Frontend/UI refinements and authorization groundwork: Updated interest/invoice forms with new UI components and ensured Tailwind config directive presence; created a basic authorization system. Major bugs fixed: - Event URL Fix: Change events url to /arrangementer. - Dashboard cleanup: Remove dangling modules folder in dashboard. - File path and runtime fixes: Fix broken file path; Correct NEXT_RUNTIME check for OpenTelemetry; Fix OpenTelemetry resource names. - Transactional consistency and migrations: Ensure transactional consistency across core procedures (Job, Mark, Event, Attendance, User, Article, Company, Feide, NTNU Study Plan, Payment) and fix type errors from transactional migration. - Environment and validation fixes: Fix server environment variables failing validation on client. - Minor fixes: OIDC splash role fix; Async correctness and improved parser logging. Overall impact and accomplishments: - Substantial improvement in editor quality, observability, deployment reliability, and data integrity, enabling faster feature delivery and more predictable releases. The work reduces operational toil, strengthens platform readiness for scale, and improves developer productivity through architectural improvements and automation. Technologies/skills demonstrated: - Mantine Rich Text Editor, OpenTelemetry, Sentry, Winston, Tailwind, Next.js, Docker, Prisma, environment configuration management, inversion of control (IoC), task orchestration, and transactional data handling.
July 2025 monthly summary for dotkom/monoweb: Key features delivered: - Rich Text Editor Upgrade: Replaced mdxeditor with Mantine rich editor and deduplicated RichText component to improve editing UX and maintainability. - Renovate bot maintenance and scheduling: Re-enabled Renovate and configured textual/cron-based update schedules to reduce manual dependency maintenance. - Observability and Logging Enhancements: Instrumented core apps with OpenTelemetry, added Sentry release instrumentation, and overhauled logging to Winston with OpenTelemetry-formatted outputs. - Build, Docker, and deployment improvements: Optimized Docker-based Next.js builds, deployed the dashboard as a regular Next.js build, and streamlined startup (disable service-wait during boot) to speed deployments. - Architecture and runner modernization: Migrated monoweb tasks to arm64 runners; introduced task system decoupling (discovery vs execution) and IoC improvements for greater modularity. - Frontend/UI refinements and authorization groundwork: Updated interest/invoice forms with new UI components and ensured Tailwind config directive presence; created a basic authorization system. Major bugs fixed: - Event URL Fix: Change events url to /arrangementer. - Dashboard cleanup: Remove dangling modules folder in dashboard. - File path and runtime fixes: Fix broken file path; Correct NEXT_RUNTIME check for OpenTelemetry; Fix OpenTelemetry resource names. - Transactional consistency and migrations: Ensure transactional consistency across core procedures (Job, Mark, Event, Attendance, User, Article, Company, Feide, NTNU Study Plan, Payment) and fix type errors from transactional migration. - Environment and validation fixes: Fix server environment variables failing validation on client. - Minor fixes: OIDC splash role fix; Async correctness and improved parser logging. Overall impact and accomplishments: - Substantial improvement in editor quality, observability, deployment reliability, and data integrity, enabling faster feature delivery and more predictable releases. The work reduces operational toil, strengthens platform readiness for scale, and improves developer productivity through architectural improvements and automation. Technologies/skills demonstrated: - Mantine Rich Text Editor, OpenTelemetry, Sentry, Winston, Tailwind, Next.js, Docker, Prisma, environment configuration management, inversion of control (IoC), task orchestration, and transactional data handling.
June 2025 performance summary for cedar-policy/cedar and dotkom/monoweb. Focused on delivering feature improvements and stabilizing the codebase through targeted parser enhancements and maintenance upgrades.
June 2025 performance summary for cedar-policy/cedar and dotkom/monoweb. Focused on delivering feature improvements and stabilizing the codebase through targeted parser enhancements and maintenance upgrades.
May 2025 monthly summary for dotkom/monoweb focused on tangible technical improvements and stability enhancements. Two items were advanced: centralized RPC service layer initialization to improve efficiency and a DevOps adjustment to disable Renovate bot to prevent update conflicts, increasing release stability.
May 2025 monthly summary for dotkom/monoweb focused on tangible technical improvements and stability enhancements. Two items were advanced: centralized RPC service layer initialization to improve efficiency and a DevOps adjustment to disable Renovate bot to prevent update conflicts, increasing release stability.
This month focused on strengthening product reliability, developer experience, and system observability for dotkom/monoweb. Delivered user-facing authentication and streamlined company management workflows, improved build and deployment pipelines, and hardened build-time checks to catch configuration issues early. Added observability to quickly diagnose issues and opened up internal queries to support integrations.
This month focused on strengthening product reliability, developer experience, and system observability for dotkom/monoweb. Delivered user-facing authentication and streamlined company management workflows, improved build and deployment pipelines, and hardened build-time checks to catch configuration issues early. Added observability to quickly diagnose issues and opened up internal queries to support integrations.
March 2025 delivered a comprehensive modernization of the monoweb frontend and deployment stack, driving developer velocity, reliability, and user-facing performance. The work spanned frontend tooling upgrades, infrastructure improvements, core library upgrades, observability enhancements, and UI polish, with a clear link to business value through faster releases, improved stability, and richer user experience.
March 2025 delivered a comprehensive modernization of the monoweb frontend and deployment stack, driving developer velocity, reliability, and user-facing performance. The work spanned frontend tooling upgrades, infrastructure improvements, core library upgrades, observability enhancements, and UI polish, with a clear link to business value through faster releases, improved stability, and richer user experience.
February 2025 in dotkom/monoweb focused on platform hygiene and security hardening, delivering major stack upgrades and centralized configuration to improve security, performance, and maintainability. These changes reduce risk, improve deployment safety on Vercel, and set up faster iteration cycles for future work.
February 2025 in dotkom/monoweb focused on platform hygiene and security hardening, delivering major stack upgrades and centralized configuration to improve security, performance, and maintainability. These changes reduce risk, improve deployment safety on Vercel, and set up faster iteration cycles for future work.
January 2025: Two-pronged delivery focused on backend modernization and build/reliability improvements. In espressif/llvm-project, completed Opaque Pointer API modernization across LLVM IR components and SPIR-V backend, with associated tests and cleanup in DataFlowSanitizer and ModuleUtils. In dotkom/monoweb, implemented environment isolation for reproducible builds and delivered CI reliability and security enhancements (attendance patch, disabled web/dashboard in CI, and avoid Doppler during builds). These efforts reduce maintenance costs, lower CI risk, and establish a solid foundation for future work.
January 2025: Two-pronged delivery focused on backend modernization and build/reliability improvements. In espressif/llvm-project, completed Opaque Pointer API modernization across LLVM IR components and SPIR-V backend, with associated tests and cleanup in DataFlowSanitizer and ModuleUtils. In dotkom/monoweb, implemented environment isolation for reproducible builds and delivered CI reliability and security enhancements (attendance patch, disabled web/dashboard in CI, and avoid Doppler during builds). These efforts reduce maintenance costs, lower CI risk, and establish a solid foundation for future work.
December 2024 monthly summary for compiler-explorer/compiler-explorer focused on security-hardening, caching correctness, and modernization to improve stability and developer experience. Delivered two primary features with measurable business value and completed a set of modernization efforts to reduce technical debt and enable faster future iterations.
December 2024 monthly summary for compiler-explorer/compiler-explorer focused on security-hardening, caching correctness, and modernization to improve stability and developer experience. Delivered two primary features with measurable business value and completed a set of modernization efforts to reduce technical debt and enable faster future iterations.
November 2024: Delivered major modernization and reliability improvements for compiler-explorer, including asynchronous site template loading with a dedicated API controller, type-safe health checks with a dedicated controller, API routing modernization via SourceController and HttpController interface, Kotlin compiler version support upgrades, centralized formatting service, and broad maintenance cleanup. These changes improve startup performance, observability, platform scalability, and developer experience while enabling newer Kotlin features.
November 2024: Delivered major modernization and reliability improvements for compiler-explorer, including asynchronous site template loading with a dedicated API controller, type-safe health checks with a dedicated controller, API routing modernization via SourceController and HttpController interface, Kotlin compiler version support upgrades, centralized formatting service, and broad maintenance cleanup. These changes improve startup performance, observability, platform scalability, and developer experience while enabling newer Kotlin features.

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