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Heikki Mantere

PROFILE

Heikki Mantere

Heikki Mantere developed and refined exam and content management features in the digabi/exam-engine and digabi/rich-text-editor repositories, focusing on robust UI/UX, accessibility, and maintainability. He delivered drag-and-drop exam interactions, attachment submission workflows, and responsive layouts, using React, TypeScript, and CSS. Heikki improved keyboard accessibility, semantic heading structure, and localization, while implementing Playwright-based end-to-end testing and snapshot-driven UI validation. His work included code refactoring, schema adaptation, and release governance, ensuring stable deployments and clear traceability. By addressing both frontend and backend concerns, Heikki enabled smoother authoring, reliable grading, and a more accessible, user-friendly experience for exam-takers.

Overall Statistics

Feature vs Bugs

79%Features

Repository Contributions

172Total
Bugs
12
Commits
172
Features
45
Lines of code
817,355
Activity Months12

Work History

October 2025

33 Commits • 6 Features

Oct 1, 2025

October 2025 in the digabi/koe-ohje project focused on delivering parity-friendly navigation, stabilizing the user flow, and strengthening code quality. Key features include A1/A2 keyboard navigation parity with unified tab loading and content loading across variants, improvements to Abitti Koe-ohje flow, and enhancements to language/URL handling and search index behavior. Major bugs fixed address TOC/navigation stability, header visibility on anchor navigation, and test reliability. The result is a more reliable, accessible, and faster-to-iterate product with clearer language routing and robust tests.

September 2025

3 Commits • 2 Features

Sep 1, 2025

2025-09 monthly summary for digabi/exam-engine: Delivered user experience improvements focused on exam results UX and input UX. Implemented two key features with targeted commits and updated UI snapshots. These changes aim to provide a consistent starting view in results pages and reduce distractions during exam inputs, contributing to a smoother student experience and improved engagement.

August 2025

5 Commits • 1 Features

Aug 1, 2025

In August 2025, focused on improving content structure and accessibility in the digabi/exam-engine by standardizing the heading hierarchy and ensuring visual/test alignment across the Table of Contents and External Materials.

July 2025

7 Commits • 1 Features

Jul 1, 2025

2025-07 monthly summary for digabi/exam-engine focusing on UI/UX polish and usability improvements. Delivered a cohesive Exam UI/UX Visual Enhancements feature across exam components, including close button, answer indicators, dropdown answers, choice answer controls, expand button, text answer focus/hover, and audio player visuals. Implemented seven commits featuring inline SVG usage and targeted style refinements. A notable fix corrected answer indicator colors to improve feedback. Impact: clearer, faster interactions for test-takers and a foundation for consistent UX across exams. Skills demonstrated: inline SVG adoption, CSS/UI refinements, accessibility-focused tweaks, and richer audio/text interactions.

June 2025

25 Commits • 5 Features

Jun 1, 2025

June 2025 performance highlights across the digabi/rich-text-editor and digabi/exam-engine repositories. Delivered tangible features, stabilized QA, and progressed release readiness, delivering value to editors and exam-takers while strengthening the team's technical competencies.

May 2025

2 Commits • 2 Features

May 1, 2025

Concise monthly summary for 2025-05 highlighting delivered features, fixed UI behavior, impact, and technical skills demonstrated across two repositories.

April 2025

1 Commits • 1 Features

Apr 1, 2025

April 2025 monthly summary for digabi/exam-engine: Delivered a new Exam Type with Attachment Submissions enabling diverse student uploads (documents, images, and specialized formats) across Abitti 2 apps. Implemented binary support for each attachment type to ensure submission compatibility, and updated snapshot tests to cover attachment rendering. This feature expands exam capabilities, improves submission reliability, and positions the system for broader file-type support in future assessments.

March 2025

3 Commits • 3 Features

Mar 1, 2025

March 2025 performance summary for digabi/exam-engine: Core improvements across exam rendering, test reliability, and user experience. Delivered three focused enhancements that strengthen business value: (1) exam rendering and audio integration with robust interaction handling; (2) more reliable automated tests reducing flaky runs; (3) UX improvement by notifying users about missing attachments. These changes decrease support overhead, shorten release cycles, and demonstrate proficiency in front-end logic, test automation, and UI/UX considerations.

January 2025

5 Commits • 3 Features

Jan 1, 2025

January 2025 (Month: 2025-01) focused on strengthening UX accessibility and release governance in the digabi/exam-engine, delivering features that improve the clarity of item status, keyboard-driven interactions, and a formalized release process. These changes reduce support overhead, accelerate workflow for exam authors and evaluators, and provide a predictable release cadence for stakeholders.

December 2024

19 Commits • 3 Features

Dec 1, 2024

December 2024 focused on stabilizing and internationalizing the exam engine’s DND workflow, delivering localization, UI/UX improvements, and robust scoring, plus targeted fixes in parsing and error reporting. A development milestone tag was added to mark progress and improve repository hygiene. These efforts improved accessibility, accuracy, and maintainability of the DND assessment experience for educators and learners.

November 2024

61 Commits • 15 Features

Nov 1, 2024

November 2024 focused on delivering a robust, scalable DND-based exam authoring and results experience in the digabi/exam-engine. Key progress includes architectural improvements to drag-and-drop core, alignment with the new exam data schema, and substantial UI/UX enhancements across the exam editor and results views. These changes enable smoother authoring, reliable saving of DND interactions, richer rendering of questions and IDs, and an improved, more informative results presentation that supports better student understanding and admin oversight. The month also included targeted bug fixes to prevent incorrect numbering and to ensure containers and answers are correctly droppable, along with performance-oriented refactors.

October 2024

8 Commits • 3 Features

Oct 1, 2024

October 2024 for digabi/exam-engine: Delivered drag-and-drop support via the DNDAnswer component, enabling a new exam question type; removed legacy NativeDND and test-only drag-and-drop components to simplify the codebase; fixed image load warning logic in grading to trigger warnings at the correct times; introduced release tagging for v22.1.1, v22.1.2, and v22.1.3 to improve deployment traceability and rollback readiness. These changes delivered tangible business value and improved maintainability, UX, and deployment discipline.

Activity

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Quality Metrics

Correctness87.8%
Maintainability87.6%
Architecture82.4%
Performance84.8%
AI Usage20.2%

Skills & Technologies

Programming Languages

CSSHTMLJavaScriptLESSLessMarkdownShellTypeScriptXMLts

Technical Skills

AccessibilityBackend DevelopmentCSSCSS StylingCode QualityCode RefactoringCode SanitizationCode SimplificationComponent ArchitectureComponent DesignComponent DevelopmentComponent RefactoringComponent ReusabilityConfigurationDependency Management

Repositories Contributed To

3 repos

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

digabi/exam-engine

Oct 2024 Sep 2025
11 Months active

Languages Used

CSSHTMLJavaScriptTypeScriptLessXMLtsxts

Technical Skills

Component DevelopmentFront End DevelopmentFront-end DevelopmentFrontend DevelopmentReactTypeScript

digabi/koe-ohje

Oct 2025 Oct 2025
1 Month active

Languages Used

CSSHTMLJavaScriptMarkdownShellTypeScript

Technical Skills

AccessibilityCSSConfigurationDocumentationEnd-to-End TestingFront End Development

digabi/rich-text-editor

May 2025 Jun 2025
2 Months active

Languages Used

JavaScriptTypeScript

Technical Skills

Code SanitizationFront End DevelopmentTestingCode RefactoringEnd-to-end testingHTML Sanitization

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