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david steinsland

PROFILE

David Steinsland

David Steinsland engineered core payout and eligibility features in navikt/helse-spleis, focusing on modularizing the economy domain and modernizing data models for payroll and self-employed workflows. He refactored state machines and decoupled calculation logic, introducing builder patterns and domain-driven design to improve maintainability and scalability. Using Kotlin and Java, David unified income handling, enhanced timeline calculations, and streamlined error handling, while integrating new data sources and refining serialization. His work included robust test automation and infrastructure upgrades, ensuring reliable deployments and accurate payroll processing. The depth of his contributions enabled faster releases, improved data integrity, and long-term codebase resilience.

Overall Statistics

Feature vs Bugs

71%Features

Repository Contributions

958Total
Bugs
153
Commits
958
Features
368
Lines of code
182,389
Activity Months12

Work History

October 2025

114 Commits • 58 Features

Oct 1, 2025

October 2025 performance snapshot for navikt/helse-spleis: Delivered robust payout timeline capabilities, modernized the data model and binding, and strengthened eligibility calculations. Key outcomes include: (1) Payout Timeline Enhancements enabling full-period calculation including self-employed overrides and corrected-application handling, (2) Data Model and Binding Refactors decoupling from Vedtaksperiode and Grundlagsdata, unifying incomes for calculation via Yrkesaktivitet-objektet and improved sickness-basis handling, (3) Death Date Handling integrated into max-date filters for more accurate eligibility and timeline calculations, (4) Income and Filter Enhancements consolidating income calculations and refining minimum-income checks outside the filter, and (5) Test Improvements and Coverage with inspector-based testing and consolidated age-related tests. Impact includes improved eligibility accuracy, reliable payout generation over the full monitoring window, and easier long-term evolution. Technologies/skills demonstrated include extensive refactoring, modularization across domain contexts, state-machine based waiting time handling, data model evolution, and targeted test automation.

September 2025

42 Commits • 20 Features

Sep 1, 2025

September 2025 performance summary for navikt/helse-spleis focuses on modularization, data processing modernization, UX improvements, and broadened self-employed workflow support, delivering measurable business value through improved scalability, reliability, and release velocity. Notable initiatives include packaging the Economy Module as a standalone publishable package with dependencies streamlined to enable reuse and faster deployment, and implementing codebase cleanups to remove Ø-specific handling for future resilience. The month also delivered extensive data-model and processing enhancements: migrating work-situation handling into Spanner, consolidating to a single work activity type, interpreting work situation from applications, and expanding income data handling from A-ordningen; and advancing Infotrygd AGP processing with EPOCH-day migration. Self-employed application workflows were broadened to cover all types, new categories (farmer, fisherman, other), immediate acceptance capability, and expanded AGP processing (ferdigAvklart), plus dedicated data streams for specialized categories and improved null handling. UX, observability, and reliability were strengthened through a dedicated error message line, enhanced logging and assertions, core date/JSON handling improvements, and token/fetch dependency fixes; and library upgrades supported ongoing maintenance. A controlled experimentation with temporary database scaling demonstrated scalability planning and rollback discipline to maintain system stability.

August 2025

61 Commits • 22 Features

Aug 1, 2025

August 2025 performance summary: Build tooling modernization, dependency upgrades, and architectural/data-model refinements across the health modules. Upgraded Gradle wrapper to 9.0.0 and Kotlin toolchains (up to 2.2.10) across all repos, enabling latest features, better performance, and improved compatibility. Updated core libraries (rapidsAndRivers, tbd-libs, Ktor) to recent releases for security patches and stability. In helse-spleis, moved the state machine to its own package, refactored for maintainability, simplified wait/logic, and applied end-of-calculation rounding. Feriepenge work introduced core data modeling and calculation enhancements with timelines and testing, plus improved timestamp handling. The month also included targeted tests, gating controls, and logging improvements to improve reliability and observability.

June 2025

12 Commits • 4 Features

Jun 1, 2025

June 2025 monthly performance summary focusing on reliability, observability, and data accuracy across three repositories. Delivered infrastructure and data pipeline improvements that enhance business continuity, logging visibility, and payroll correctness while upgrading critical dependencies and the database engine.

May 2025

87 Commits • 28 Features

May 1, 2025

May 2025 summary: Delivered core Feriepenge-oppdrag improvements, lifecycle cleanup, and architectural separation of ferie flows from payout/oppdrag across three repos. Enabled development and migration readiness, improved deployment reliability, and boosted performance through data structure optimizations and code cleanup. Business value realized through faster releases, clearer ownership, and more robust holiday pay handling.

April 2025

47 Commits • 14 Features

Apr 1, 2025

April 2025 monthly summary for navikt/helse-spleis. Focused on stabilizing the baseline, expanding support for self-reported days, and laying groundwork for payout processing. Achieved architectural improvements to improve maintainability and performance while delivering key domain features that drive business value.

March 2025

124 Commits • 43 Features

Mar 1, 2025

March 2025 performance summary for development across helse-spleis, helse-sparkelapper, and helse-spre. The month delivered substantial architectural improvements, reliability gains, and security enhancements that directly translate to faster payouts, more accurate eligibility calculations, and safer, more maintainable deployments. Business value was realized through data model refactors, tighter validation, and streamlined deployment pipelines, enabling quicker shipping and reduced risk. Key value themes: data integrity for economic calculations, robust revurdering flows, improved performance, stronger security posture, and streamlined integration points with external systems (Spedisjon) and messaging infrastructure.

February 2025

40 Commits • 15 Features

Feb 1, 2025

February 2025 monthly summary for three repositories (navikt/helse-spleis, navikt/helse-spre, navikt/helse-sparkelapper). Focused on delivering business value through data integrity improvements, enhanced analytics, better error handling, and platform scalability. Key work included migration and stabilization of SykNav day handling, subsumptions analytics, and code quality improvements, alongside production-readiness upgrades and tooling cleanups.

January 2025

129 Commits • 60 Features

Jan 1, 2025

January 2025 delivered substantial modernization and stability improvements across core vilkårsgrunnlag processing, with a focus on DSL-driven migration, code quality, and infra resilience. Key features include migrating håndterVilkårsgrunnlag to the new DSL across diverse FlereAG tests and implementation, extensive cleanup to remove unused methods and dead code, and data-model consolidation for income handling. Critical bug fixes improved correctness and reliability, including non-re-evaluation when income is unchanged at the cut-off, correct override handling in exhaustive when-blocks, explicit references to recalculated annual income in discretionary determinations, and robust handling of unreadable messages as errors. Infra and operational improvements increased stability and throughput, including database resource tuning, memory/concurrency adjustments, and auditing capabilities, complemented by CLI configurability for concurrency. Business value: more reliable benefit calculations, fewer regressions, faster release cycles, and clearer data lineage across Nav-IT platforms.

December 2024

94 Commits • 28 Features

Dec 1, 2024

December 2024 highlights across navikt/helse-spleis, navikt/helse-spre and navikt/helse-sparkelapper focused on strengthening data integrity, reliability, and flexibility in period processing. Key features delivered include mirror publishing of previously calculated periods with selective mirroring (Speil/mirror integration), and comprehensive support for multiple skjæringstidspunkter (cut-off times) with creation from corrected applications, search across multiple cut-offs, and exposure of all possible cut-off times in the treatment flow. We also extracted corrected income/refund as its own object to improve data modeling, and unified employer-related identifiers (ORGNUMMER) to reduce duplication and improve consistency. Major reliability and quality improvements were implemented through retry logic for speed calls, dependency upgrades (R&R), and targeted test fixes (portal IM, first absence day), complemented by extensive test coverage enhancements and code-cleanup efforts. Overall impact: more accurate and robust period calculations, safer handling of complex scenarios (IM, AvBl, AGP, and multiple periods), faster release cycles, and a more maintainable codebase that supports scalable business growth.

November 2024

185 Commits • 73 Features

Nov 1, 2024

Month 2024-11 performance summary for four repositories (navikt/helse-spleis, helse-sparkelapper, helse-spinnvill, helse-spre). The month focused on modernization, reliability, and data integrity while accelerating business value through improved integrations and observability. Key features delivered and technical achievements: - Core stack modernization and build hygiene across projects: Upgraded to Ktor 3, Kotlin JVM 2.0.21, Gradle toolchain updates, and removal of wrapper config; broad dependency bumps (R&R, TBD-libs, WireMock, Flyway/Postgres) and Gradle/Gradle plugin cleanup. - Precondition API migration and subsumption enhancements: Migrated checks to the precondition API; introduced and integrated a new subsumsjon topic; enhanced message handling, spedisjon integration, and document linkage for migration readiness. - Speed/API and data flow improvements: Enabled speed-api data retrieval for person info and actorId, added retry mechanisms for transient failures, and extended access to spedisjon-async; improved JDBC URL construction via naisful-postgres. - Observability, metrics, and testing discipline: Implemented Meter registry instrumentation and MDC enhancements, added Ktor request metrics, and introduced profiling tests in development and production environments; implemented test isolation for E2E tests. - Throughput and reliability improvements: Concurrent event emission improvements with a controlled toggle for batch processing, then refined with batch-based strategies behind feature toggles; enhanced error logging and more robust actorId/fnr handling; ensured production event emission and existing routing stability. Major bugs fixed and stabilization: - Reverted preparation for saksbehandling start (regression fix). FOM validation corrected (FOM cannot be after TOM). Fixed missing aktørId from inntektskomponenten and removed extraneous actorId usage in responses. - Various configuration, routing, and syntax fixes, and micrometer warning cleanup; resolved test failures after dependencies updates; cleaned up legacy/unused parameters and code paths. Overall impact and business value: - Reduced regression risk and stability gaps while accelerating feature delivery through modernized tooling and safer API boundaries. Improved data correctness in critical validation paths, enhanced observability for faster issue diagnosis, and strengthened system resilience with retry logic and server-side performance monitoring. Technologies/skills demonstrated: - Kotlin, Ktor, Gradle toolchains, JVM 2.0.21, precondition API, speed-api usage, Spedisjon integration, MDC and Micrometer observability, profiling/testing in dev/prod, and robust data modeling for messaging and vedtaksperioder.

October 2024

23 Commits • 3 Features

Oct 1, 2024

2024-10 performance summary: Implemented a major Event model and logging overhaul in helse-spleis, standardizing HendelseMetadata, decoupling aktivitetslogg, and simplifying event inheritance for core flows (DagerFraInntektsmelding, Revurderingseventyr). Follow-on changes improved observability and maintainability through dedicated data classes and clearer ownership of identifiers. Restored production deployment readiness and scaled infrastructure: re-enabled prod deployment steps, provisioned access for new apps, and adopted Kafka-based scaling to replace custom HPA, enabling safer, faster deployments. Strengthened test reliability by fixing notification filtering and removing heavy tests to reduce maintenance burden. Enhanced sparkelapper resilience with startup error handling, lazy datasource initialization, and tuned DB timeouts for stability in non-ideal DB availability scenarios. Launched Kafka topic support for sykepengeperioder to enable the new data stream and improve processing throughput. Combined, these efforts deliver faster, safer deployments, stronger data processing fidelity, and improved system resilience, driving business value through reduced risk and faster feature delivery.

Activity

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Quality Metrics

Correctness89.2%
Maintainability89.4%
Architecture87.4%
Performance80.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

BashBatchDockerfileGradleGraphQLJSONJavaKotlinMarkdownSQL

Technical Skills

API DesignAPI DevelopmentAPI IntegrationAPI TestingAlgorithm OptimizationAlgorithm RefactoringAssertion Library DevelopmentAuthenticationBackend DevelopmentBuild AutomationBuild ConfigurationBuild ManagementBuild System ConfigurationBuild Tool ConfigurationBuild Tool Management

Repositories Contributed To

4 repos

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

navikt/helse-spleis

Oct 2024 Oct 2025
12 Months active

Languages Used

JavaKotlinYAMLDockerfileGradleMarkdownSQLJSON

Technical Skills

API DesignBackend DevelopmentCI/CDCode CleanupCode OrganizationCode Readability

navikt/helse-spre

Nov 2024 Aug 2025
8 Months active

Languages Used

GradleGraphQLJavaKotlinMarkdownSQLYAMLShell

Technical Skills

API IntegrationBackend DevelopmentBuild AutomationBuild ConfigurationBuild ManagementBuild Tool Management

navikt/helse-sparkelapper

Oct 2024 Aug 2025
9 Months active

Languages Used

KotlinYAMLGradleGraphQLJavaSQLShellBatch

Technical Skills

Backend DevelopmentConfiguration ManagementDatabase IntegrationDatabase InteractionDatabase ManagementError Handling

navikt/helse-spinnvill

Nov 2024 Nov 2024
1 Month active

Languages Used

BatchGradleKotlinShell

Technical Skills

Backend DevelopmentBuild ToolsDependency ManagementGradleKafka

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