Opetushallitus/koski
May 2025 – Oct 2025
6 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, reporting, and user interface features for educational data management. He designed and integrated multi-degree completion workflows, enhanced duplicate validation logic, and refactored core data models to support evolving business requirements. Using Scala, TypeScript, and React, Juho implemented API enhancements, improved authentication flows, and streamlined UI/UX for both administrators and end users. His work included schema updates, test automation, and documentation improvements, resulting in more reliable data integrity and maintainable code. Juho’s approach demonstrated technical depth through thoughtful refactoring, comprehensive testing, and alignment with regulatory and reporting needs.
Overall Statistics
Feature vs Bugs
77%Features
Repository Contributions
144Total
Bugs
13
Commits
144
Features
44
Lines of code
78,875
Activity Months6
Your Network
6 people
Work History
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
Correctness89.4%
Maintainability87.6%
Architecture84.4%
Performance81.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
CSSConfHOCONHTMLJavaJavaScriptLessMarkdownSQLScala
Technical Skills
API DesignAPI DevelopmentAPI IntegrationAuthenticationBackend DevelopmentCASCSSCSS StylingCachingCode RefactoringCode RenamingComponentizationConfiguration ManagementData ModelingData Processing
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