Opetushallitus/koto-rekisteri
Nov 2024 – Oct 2025
12 Months active
Languages Used
CSSHTMLHTML/MustacheJavaJavaScriptKotlinMustacheSQL
Technical Skills
API DesignAPI IntegrationBackend DevelopmentBuild SystemsCSSConfiguration Management
Tintti Rahikainen
PROFILE
Tintti Rahikainen
Tintti Rahikainen developed and maintained the Opetushallitus/koto-rekisteri system, delivering robust backend and frontend features to support language examination workflows. Over twelve months, Tintti enhanced data models, implemented API integrations, and improved error handling, focusing on data integrity and auditability. Using Kotlin, TypeScript, and Spring Boot, Tintti introduced incremental data imports, localization, and end-to-end test automation, while refining database schemas and validation logic. The work included building scalable data access with pagination, integrating with external services like Koski, and ensuring reliable deployments through infrastructure as code. These contributions resulted in a maintainable, testable, and production-ready platform.
Overall Statistics
Feature vs Bugs
84%Features
Repository Contributions
104Total
Bugs
7
Commits
104
Features
38
Lines of code
14,145
Activity Months12
Your Network
44 people
Work History
October 2025
3 Commits
Oct 1, 2025October 2025 monthly summary for Opetushallitus/koto-rekisteri: Focused on data reliability and error handling improvements in the Koto system, reducing duplicates and enforcing complete contact data for YKI arvioija entities. Result: more robust data quality, fewer runtime errors, and stronger auditability across Koto data flows.
3 Commits
Oct 1, 2025October 2025 monthly summary for Opetushallitus/koto-rekisteri: Focused on data reliability and error handling improvements in the Koto system, reducing duplicates and enforcing complete contact data for YKI arvioija entities. Result: more robust data quality, fewer runtime errors, and stronger auditability across Koto data flows.
October 2025
September 2025
10 Commits • 4 Features
Sep 1, 2025September 2025 monthly summary for Opetushallitus/koto-rekisteri focused on delivering data model and transfer enhancements for VKT, robust Koski error handling with user-visible error display, UI polish for improved consistency, and a build dependency upgrade. These efforts delivered measurable business value: faster, more reliable data transfers, clearer error observability, and a smoother user experience, all while keeping dependencies current.
September 2025
10 Commits • 4 Features
Sep 1, 2025September 2025 monthly summary for Opetushallitus/koto-rekisteri focused on delivering data model and transfer enhancements for VKT, robust Koski error handling with user-visible error display, UI polish for improved consistency, and a build dependency upgrade. These efforts delivered measurable business value: faster, more reliable data transfers, clearer error observability, and a smoother user experience, all while keeping dependencies current.
August 2025
10 Commits • 4 Features
Aug 1, 2025August 2025 monthly summary for Opetushallitus/koto-rekisteri focusing on localization, deployment readiness, and data accuracy. Delivered Finnish locale support in the database and end-to-end tests (fi_FI collation, locale-aware test containers, and KoskiRequestMapper testing), updated QA/Production environment configurations for streamlined deployments, and standardized Finnish UI texts. Implemented Koski audit logs integration improvements for maintainability and type safety. Fixed critical data presentation and navigation issues (YKI suoritukset total pages and breadcrumbs), enhancing user trust and navigability.
10 Commits • 4 Features
Aug 1, 2025August 2025 monthly summary for Opetushallitus/koto-rekisteri focusing on localization, deployment readiness, and data accuracy. Delivered Finnish locale support in the database and end-to-end tests (fi_FI collation, locale-aware test containers, and KoskiRequestMapper testing), updated QA/Production environment configurations for streamlined deployments, and standardized Finnish UI texts. Implemented Koski audit logs integration improvements for maintainability and type safety. Fixed critical data presentation and navigation issues (YKI suoritukset total pages and breadcrumbs), enhancing user trust and navigability.
August 2025
July 2025
3 Commits • 2 Features
Jul 1, 2025July 2025 — Opetushallitus/koto-rekisteri: Strengthened data clarity and UI reliability for the YKI Arvioija flow. Delivered targeted data-model improvements and UI navigation fixes, supported by end-to-end tests to ensure stability and guard against regressions. Business value was increased through clearer mock data, more reliable navigation, and automated tests that protect user flows.
July 2025
3 Commits • 2 Features
Jul 1, 2025July 2025 — Opetushallitus/koto-rekisteri: Strengthened data clarity and UI reliability for the YKI Arvioija flow. Delivered targeted data-model improvements and UI navigation fixes, supported by end-to-end tests to ensure stability and guard against regressions. Business value was increased through clearer mock data, more reliable navigation, and automated tests that protect user flows.
June 2025
1 Commits
Jun 1, 2025June 2025: In Opetushallitus/koto-rekisteri, delivered robust error handling for VKT Suoritus retrieval. Previously, not-found entries returned null, which could lead to silent failures downstream. The new behavior throws VktSuoritusNotFoundError to clearly signal missing data, enabling explicit upstream handling, faster troubleshooting, and improved monitoring. This change enhances data integrity and reliability for consumer services relying on vkt suoritus data, delivering business value through clearer contracts and reduced support overhead. The work was implemented as part of the June release, anchored by a focused commit.
1 Commits
Jun 1, 2025June 2025: In Opetushallitus/koto-rekisteri, delivered robust error handling for VKT Suoritus retrieval. Previously, not-found entries returned null, which could lead to silent failures downstream. The new behavior throws VktSuoritusNotFoundError to clearly signal missing data, enabling explicit upstream handling, faster troubleshooting, and improved monitoring. This change enhances data integrity and reliability for consumer services relying on vkt suoritus data, delivering business value through clearer contracts and reduced support overhead. The work was implemented as part of the June release, anchored by a focused commit.
June 2025
May 2025
14 Commits • 3 Features
May 1, 2025May 2025 Monthly Summary – Opetushallitus/koto-rekisteri Key features delivered: - VKT Suoritus data model and persistence: core data model, added DB table and repository; normalized related sub-records (osakoe/tutkinto); included created_at audit fields to improve data integrity and reporting. - KielitestiSuoritusError enriched context and reporting: added school context (schoolOid) and teacher contact (teacherEmail); mapped fields through the system; extended database schema and tests to improve error analysis and traceability. - Koto Suoritus error handling and validation improvements: enhanced error handling and validation with updated fixtures, end-to-end tests, and richer error reporting to support reliable diagnostics and user-facing error details. - YKI suoritukset pagination sort fix: corrected paging sort behavior to ensure consistent and correct sorting across pages. Major bugs fixed: - YKI suoritukset pagination sort bug resolved for consistent cross-page ordering. Overall impact and accomplishments: - Strengthened data integrity, traceability, and diagnostics across core Suoritus workflows. - Improved reliability of error reporting for Koto and Kielitesti Suoritus paths; expanded test coverage and CI signals. - Enhanced reporting readiness from the new VKT data model, enabling more accurate analytics and auditing. - Reduced user-facing risk through robust validation and stable pagination behavior. Technologies/skills demonstrated: - Data modeling and persistence layer evolution (domain modeling, DB schema, repository pattern, audit fields). - System-wide error context propagation and mapping (school context, teacher contact). - End-to-end and UI testing (Playwright) and test fixture management. - Validation, input normalization, and robust error reporting. - Pagination and sorting correctness for large datasets.
May 2025
14 Commits • 3 Features
May 1, 2025May 2025 Monthly Summary – Opetushallitus/koto-rekisteri Key features delivered: - VKT Suoritus data model and persistence: core data model, added DB table and repository; normalized related sub-records (osakoe/tutkinto); included created_at audit fields to improve data integrity and reporting. - KielitestiSuoritusError enriched context and reporting: added school context (schoolOid) and teacher contact (teacherEmail); mapped fields through the system; extended database schema and tests to improve error analysis and traceability. - Koto Suoritus error handling and validation improvements: enhanced error handling and validation with updated fixtures, end-to-end tests, and richer error reporting to support reliable diagnostics and user-facing error details. - YKI suoritukset pagination sort fix: corrected paging sort behavior to ensure consistent and correct sorting across pages. Major bugs fixed: - YKI suoritukset pagination sort bug resolved for consistent cross-page ordering. Overall impact and accomplishments: - Strengthened data integrity, traceability, and diagnostics across core Suoritus workflows. - Improved reliability of error reporting for Koto and Kielitesti Suoritus paths; expanded test coverage and CI signals. - Enhanced reporting readiness from the new VKT data model, enabling more accurate analytics and auditing. - Reduced user-facing risk through robust validation and stable pagination behavior. Technologies/skills demonstrated: - Data modeling and persistence layer evolution (domain modeling, DB schema, repository pattern, audit fields). - System-wide error context propagation and mapping (school context, teacher contact). - End-to-end and UI testing (Playwright) and test fixture management. - Validation, input normalization, and robust error reporting. - Pagination and sorting correctness for large datasets.
April 2025
5 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for Opetushallitus/koto-rekisteri: Focused on improving KOSKI integration reliability and test quality. Delivered targeted changes to align the Koski user-facing student rights status with the updated Koodisto enum and KoskiRequestMapper, and strengthened Koski service test coverage with comprehensive mock data cleanup and new failure-mode tests. Result: more accurate data in KOSKI, more robust test suites, reduced production risk, and faster feedback for future changes.
5 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for Opetushallitus/koto-rekisteri: Focused on improving KOSKI integration reliability and test quality. Delivered targeted changes to align the Koski user-facing student rights status with the updated Koodisto enum and KoskiRequestMapper, and strengthened Koski service test coverage with comprehensive mock data cleanup and new failure-mode tests. Result: more accurate data in KOSKI, more robust test suites, reduced production risk, and faster feedback for future changes.
April 2025
March 2025
8 Commits • 1 Features
Mar 1, 2025Concise monthly summary for 2025-03 focusing on Opetushallitus/koto-rekisteri. Deliverables center on Koski/YKI integration, data model improvements, and reliability enhancements that increase data integrity and observability. The month culminated in a robust integration with Koski and YKI, enabling more complete student data handling and smoother record synchronization across systems, with improvements to configuration and monitoring driving operational efficiency.
March 2025
8 Commits • 1 Features
Mar 1, 2025Concise monthly summary for 2025-03 focusing on Opetushallitus/koto-rekisteri. Deliverables center on Koski/YKI integration, data model improvements, and reliability enhancements that increase data integrity and observability. The month culminated in a robust integration with Koski and YKI, enabling more complete student data handling and smoother record synchronization across systems, with improvements to configuration and monitoring driving operational efficiency.
February 2025
14 Commits • 4 Features
Feb 1, 2025February 2025 monthly summary for Opetushallitus/koto-rekisteri. Focused on delivering scalable data access, robust data modeling, and integration readiness that unlocks downstream business value. Major accomplishments include paginated data access and search for YKI suoritukset, UI navigation refinements, and e2e test coverage to validate performance improvements; YKI Arvioijat data model enhancements with sorting by registration time, expanded UI fields for start/end dates and registration details, and a robust enum-based status with migrations; Koski API integration scaffolding including a dedicated KoskiRequest model, mapper from YkiSuoritus entities to KoskiRequest, and language code handling improvements via enums and mappings; UI polish for large datasets with sideways scrolling and custom error templates (including 404) to improve reliability; plus dev support with a mock data route to seed YKI suoritus data for testing.
14 Commits • 4 Features
Feb 1, 2025February 2025 monthly summary for Opetushallitus/koto-rekisteri. Focused on delivering scalable data access, robust data modeling, and integration readiness that unlocks downstream business value. Major accomplishments include paginated data access and search for YKI suoritukset, UI navigation refinements, and e2e test coverage to validate performance improvements; YKI Arvioijat data model enhancements with sorting by registration time, expanded UI fields for start/end dates and registration details, and a robust enum-based status with migrations; Koski API integration scaffolding including a dedicated KoskiRequest model, mapper from YkiSuoritus entities to KoskiRequest, and language code handling improvements via enums and mappings; UI polish for large datasets with sideways scrolling and custom error templates (including 404) to improve reliability; plus dev support with a mock data route to seed YKI suoritus data for testing.
February 2025
January 2025
10 Commits • 4 Features
Jan 1, 2025January 2025 — Performance highlights for Opetushallitus/koto-rekisteri. Key features delivered include: (1) YKI Arvioija import auditing and data integrity enhancements—audit logging for imports, expanded unique constraints, repository tests for duplicates/versions, and batch save improvements returning only newly saved/updated entities with safer ID handling. (2) YKI Suoritus import and persistence improvements—saveAll returns only newly saved/updated suoritukset, added tests, and post-save audit logging for persisted records. (3) Environment-aware S3 bucket naming—append environment name to bucket name to prevent cross-environment collisions. (4) Enable asynchronous processing in Kitu application—Spring @EnableAsync and test adjustments to support asynchronous execution. Major bugs fixed: API data quality bug fix to handle null gender values—allow Sukupuoli to be nullable and default to 'E' in mapping to prevent errors from missing gender data. Overall impact and accomplishments: Strengthened data integrity and auditability, reduced risk of duplicates in batch imports, improved deployment isolation across environments, and increased throughput through asynchronous processing. This work delivers measurable business value by ensuring cleaner data, traceable imports, and more reliable deployments. Technologies/skills demonstrated: Spring Framework (EnableAsync), Spring Data JPA, audit logging, robust batch processing, test-driven development, and AWS S3 deployment considerations.
January 2025
10 Commits • 4 Features
Jan 1, 2025January 2025 — Performance highlights for Opetushallitus/koto-rekisteri. Key features delivered include: (1) YKI Arvioija import auditing and data integrity enhancements—audit logging for imports, expanded unique constraints, repository tests for duplicates/versions, and batch save improvements returning only newly saved/updated entities with safer ID handling. (2) YKI Suoritus import and persistence improvements—saveAll returns only newly saved/updated suoritukset, added tests, and post-save audit logging for persisted records. (3) Environment-aware S3 bucket naming—append environment name to bucket name to prevent cross-environment collisions. (4) Enable asynchronous processing in Kitu application—Spring @EnableAsync and test adjustments to support asynchronous execution. Major bugs fixed: API data quality bug fix to handle null gender values—allow Sukupuoli to be nullable and default to 'E' in mapping to prevent errors from missing gender data. Overall impact and accomplishments: Strengthened data integrity and auditability, reduced risk of duplicates in batch imports, improved deployment isolation across environments, and increased throughput through asynchronous processing. This work delivers measurable business value by ensuring cleaner data, traceable imports, and more reliable deployments. Technologies/skills demonstrated: Spring Framework (EnableAsync), Spring Data JPA, audit logging, robust batch processing, test-driven development, and AWS S3 deployment considerations.
December 2024
15 Commits • 11 Features
Dec 1, 2024December 2024 monthly summary for Opetushallitus/koto-rekisteri. Delivered core YKI Suoritukset improvements, modernized date handling, data consistency enhancements, and production readiness improvements. Focused on business value, data integrity, and maintainability across the YKI domain, with solid test coverage and observable production readiness.
15 Commits • 11 Features
Dec 1, 2024December 2024 monthly summary for Opetushallitus/koto-rekisteri. Delivered core YKI Suoritukset improvements, modernized date handling, data consistency enhancements, and production readiness improvements. Focused on business value, data integrity, and maintainability across the YKI domain, with solid test coverage and observable production readiness.
December 2024
November 2024
11 Commits • 4 Features
Nov 1, 2024November 2024 month-end summary for Opetushallitus/koto-rekisteri. Delivered a series of backend, UI, and data integration enhancements for YKI Suoritus, alongside a robust incremental import workflow and a Mustache-based frontend. The work improves data accuracy, reduces duplicates, and enables reliable exports and versioned data views for end users.
November 2024
11 Commits • 4 Features
Nov 1, 2024November 2024 month-end summary for Opetushallitus/koto-rekisteri. Delivered a series of backend, UI, and data integration enhancements for YKI Suoritus, alongside a robust incremental import workflow and a Mustache-based frontend. The work improves data accuracy, reduces duplicates, and enables reliable exports and versioned data views for end users.
Activity
Loading activity data...
Quality Metrics
Correctness91.4%
Maintainability90.8%
Architecture89.0%
Performance84.2%
AI Usage20.0%
Skills & Technologies
Programming Languages
CSSHTMLHTML/MustacheJavaJavaScriptKotlinMustachePropertiesSQLShell
Technical Skills
API DesignAPI DevelopmentAPI IntegrationAWS CDKAWS LambdaAsynchronous ProgrammingAuditingBackend DevelopmentBackend developmentBuild SystemsCSSCSV ParsingCSV SerializationCloudWatch LogsCode Documentation
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline