Opetushallitus/koski
May 2025 – Feb 2026
10 Months active
Languages Used
JavaScriptMarkdownScalaTypeScriptHTMLJavaLessSQL
Technical Skills
API DesignAPI DevelopmentBackend DevelopmentCode RenamingData ModelingData Reporting
Juho Tammela
PROFILE
Juho Tammela
Juho Tammela contributed to the Opetushallitus/koski repository by engineering robust data validation, API enhancements, and UI improvements for educational data systems. Over ten months, he delivered features such as multi-degree support, mass data transfer APIs, and expanded SUPA API capabilities, focusing on data integrity and compliance. Juho applied Scala, TypeScript, and React to refactor data models, optimize backend queries, and streamline frontend workflows. His work addressed complex validation logic, improved error handling, and ensured regulatory alignment. Through comprehensive testing and documentation, Juho’s solutions enhanced reliability, maintainability, and user experience for both municipal officials and end users.
Overall Statistics
Feature vs Bugs
74%Features
Repository Contributions
253Total
Bugs
34
Commits
253
Features
97
Lines of code
114,524
Activity Months10
Your Network
6 peopleWork History
February 2026
12 Commits • 5 Features
Feb 1, 2026February 2026 achievements for Opetushallitus/koski focused on UI polish, data validation, and API capabilities to improve compliance, visibility, and user experience. Deliverables include UI enhancements for Special Examinations and Special Qualifications, cross-curriculum validation with test coverage, SUPA API expansion with preparatory education support and time-window filtering, UI improvements for progress and performance tables, and hiding incomplete adult basic education evaluations to reduce confusion. These changes enhance accuracy of scope and footnotes, enable precise queries, and provide consistent citizen/official views, delivering tangible value in reporting, compliance, and usability.
12 Commits • 5 Features
Feb 1, 2026February 2026 achievements for Opetushallitus/koski focused on UI polish, data validation, and API capabilities to improve compliance, visibility, and user experience. Deliverables include UI enhancements for Special Examinations and Special Qualifications, cross-curriculum validation with test coverage, SUPA API expansion with preparatory education support and time-window filtering, UI improvements for progress and performance tables, and hiding incomplete adult basic education evaluations to reduce confusion. These changes enhance accuracy of scope and footnotes, enable precise queries, and provide consistent citizen/official views, delivering tangible value in reporting, compliance, and usability.
February 2026
January 2026
35 Commits • 21 Features
Jan 1, 2026January 2026 for Opetushallitus/koski focused on expanding the SUPA API surface, tightening data integrity across Valppa interfaces, and strengthening testing and documentation. The work delivered richer study-right representations, more reliable cross-system results, and improved developer experience through better tests and docs.
January 2026
35 Commits • 21 Features
Jan 1, 2026January 2026 for Opetushallitus/koski focused on expanding the SUPA API surface, tightening data integrity across Valppa interfaces, and strengthening testing and documentation. The work delivered richer study-right representations, more reliable cross-system results, and improved developer experience through better tests and docs.
December 2025
24 Commits • 11 Features
Dec 1, 2025December 2025 (Opetushallitus/koski) delivered significant improvements to mass data transfer, data governance, and API robustness. Focus areas included enriching transfer data with geographic context, refactoring core mass transfer APIs, clarifying JSON schemas, improving error reporting, and expanding testing and documentation. These changes enhance data quality, traceability, and operational reliability across Valpas, SUPA, and OPH mass transfer workflows, enabling municipalities and educational institutions to trust and automate data exchanges with confidence.
24 Commits • 11 Features
Dec 1, 2025December 2025 (Opetushallitus/koski) delivered significant improvements to mass data transfer, data governance, and API robustness. Focus areas included enriching transfer data with geographic context, refactoring core mass transfer APIs, clarifying JSON schemas, improving error reporting, and expanding testing and documentation. These changes enhance data quality, traceability, and operational reliability across Valpas, SUPA, and OPH mass transfer workflows, enabling municipalities and educational institutions to trust and automate data exchanges with confidence.
December 2025
November 2025
38 Commits • 16 Features
Nov 1, 2025November 2025 monthly summary focusing on business value and technical achievements for Koski (Opetushallitus).
November 2025
38 Commits • 16 Features
Nov 1, 2025November 2025 monthly summary focusing on business value and technical achievements for Koski (Opetushallitus).
October 2025
44 Commits • 10 Features
Oct 1, 2025October 2025 monthly summary for Opetushallitus/koski: concise yet comprehensive delivery across validations, UI, data model, and testing. The month saw major business-value features delivered, substantial bug fixes, and improvements to reliability, maintainability, and developer productivity. Highlights include validation framework refinements with forward-looking activation dates, UI/Calendar enhancements, PreIB2019 data additions, and targeted refactoring and test stabilization.
44 Commits • 10 Features
Oct 1, 2025October 2025 monthly summary for Opetushallitus/koski: concise yet comprehensive delivery across validations, UI, data model, and testing. The month saw major business-value features delivered, substantial bug fixes, and improvements to reliability, maintainability, and developer productivity. Highlights include validation framework refinements with forward-looking activation dates, UI/Calendar enhancements, PreIB2019 data additions, and targeted refactoring and test stabilization.
October 2025
September 2025
33 Commits • 9 Features
Sep 1, 2025September 2025 Koski: Delivered multi-degree (useasta tutkinnosta) UI and data enhancements to support partial/full degree performances, adding local and common parts across multiple degrees and improving lists. Implemented frontend refactor and UI/UX enhancements (component consolidation, debounce for search, clearer naming, tighter spacing). Added degree search caching in the vocational UI and improved end-user validation messages for readability. Expanded testing coverage (UI tests for citizen view) and documentation updates (JSON schema deprecation guidance and example learners). Enforced policy changes including post-deadline transfer restrictions and vacation state validation after cutoff date to strengthen data integrity.
September 2025
33 Commits • 9 Features
Sep 1, 2025September 2025 Koski: Delivered multi-degree (useasta tutkinnosta) UI and data enhancements to support partial/full degree performances, adding local and common parts across multiple degrees and improving lists. Implemented frontend refactor and UI/UX enhancements (component consolidation, debounce for search, clearer naming, tighter spacing). Added degree search caching in the vocational UI and improved end-user validation messages for readability. Expanded testing coverage (UI tests for citizen view) and documentation updates (JSON schema deprecation guidance and example learners). Enforced policy changes including post-deadline transfer restrictions and vacation state validation after cutoff date to strengthen data integrity.
August 2025
7 Commits • 1 Features
Aug 1, 2025Concise monthly summary for August 2025 focusing on business value and technical achievements in Opetushallitus/koski.
7 Commits • 1 Features
Aug 1, 2025Concise monthly summary for August 2025 focusing on business value and technical achievements in Opetushallitus/koski.
August 2025
July 2025
6 Commits • 3 Features
Jul 1, 2025July 2025 — Opetushallitus/koski: Focused on strengthening data integrity, user control over study rights, and reporting readiness through targeted features, UI/state improvements, and API enhancements. Key outcomes include explicit removal of main-level performances, persistence improvements for EE submissions, refactored DP Core data model with UI alignment, and Migri API extension for EE sub-performance subject mapping. All changes are aligned with the updated data schema and DP Core reporting requirements, delivering tangible business value and improved developer experience.
July 2025
6 Commits • 3 Features
Jul 1, 2025July 2025 — Opetushallitus/koski: Focused on strengthening data integrity, user control over study rights, and reporting readiness through targeted features, UI/state improvements, and API enhancements. Key outcomes include explicit removal of main-level performances, persistence improvements for EE submissions, refactored DP Core data model with UI alignment, and Migri API extension for EE sub-performance subject mapping. All changes are aligned with the updated data schema and DP Core reporting requirements, delivering tangible business value and improved developer experience.
June 2025
24 Commits • 11 Features
Jun 1, 2025June 2025 performance summary for Opetushallitus/koski. This month focused on strengthening identity resolution, expanding reporting granularity for Perusopetus and Esiopetus, and improving authentication flows and test data handling to deliver higher business value and data quality. Highlights include API evolution for better data linkage, broader reporting periods and KPI data, and reliability improvements across login and data governance processes.
24 Commits • 11 Features
Jun 1, 2025June 2025 performance summary for Opetushallitus/koski. This month focused on strengthening identity resolution, expanding reporting granularity for Perusopetus and Esiopetus, and improving authentication flows and test data handling to deliver higher business value and data quality. Highlights include API evolution for better data linkage, broader reporting periods and KPI data, and reliability improvements across login and data governance processes.
June 2025
May 2025
30 Commits • 10 Features
May 1, 2025May 2025 (2025-05) focused on strengthening data integrity, production readiness, and user experience in Opetushallitus/koski. Delivered major feature work around extended duplicate validation, Sure data model integration for basic education, alignment with Koski execution context, and UI/quality improvements, while maintaining an emphasis on business value and scalable data pipelines.
May 2025
30 Commits • 10 Features
May 1, 2025May 2025 (2025-05) focused on strengthening data integrity, production readiness, and user experience in Opetushallitus/koski. Delivered major feature work around extended duplicate validation, Sure data model integration for basic education, alignment with Koski execution context, and UI/quality improvements, while maintaining an emphasis on business value and scalable data pipelines.
Activity
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Quality Metrics
Correctness91.6%
Maintainability86.4%
Architecture84.8%
Performance83.2%
AI Usage21.4%
Skills & Technologies
Programming Languages
CSSConfHOCONHTMLJSONJavaJavaScriptLessMakefileMarkdown
Technical Skills
API DesignAPI DevelopmentAPI DocumentationAPI IntegrationAPI designAPI developmentAPI testingAuthenticationBackend DevelopmentCASCI/CDCSSCSS StylingCachingCode Refactoring
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