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Timo Juonoja

PROFILE

Timo Juonoja

Timo Juonoja contributed to City-of-Helsinki’s servicemap-ui and related repositories by delivering user-facing features and reliability improvements over four months. He enhanced parking area displays, implemented multi-type parking support, and improved popup stability, focusing on robust error handling and performance optimization. Timo integrated Sentry error tracking using the Vite plugin, enabling better observability and faster issue resolution. His work included refactoring data models for efficiency, updating VAT configurations for compliance, and expanding test automation to reduce regressions. Using JavaScript, React, and Python, Timo’s engineering addressed both frontend and backend challenges, resulting in smoother user experiences and maintainable codebases.

Overall Statistics

Feature vs Bugs

83%Features

Repository Contributions

19Total
Bugs
2
Commits
19
Features
10
Lines of code
1,131
Activity Months4

Work History

February 2026

1 Commits • 1 Features

Feb 1, 2026

February 2026: Delivered Parking area display enhancements for Vantaa in servicemap-ui, including multi-type parking support, translations updates, and test coverage expansion. Applied a focused fix to the Vantaa parking area display (commit 8b1e264e358736b05a16988ee282f1baea3043e6). These changes improve user-facing parking information, increase UI accuracy, and lay groundwork for adding future parking types.

January 2026

8 Commits • 3 Features

Jan 1, 2026

January 2026 monthly summary for frontend work across City of Helsinki repositories. Focused on performance, reliability, regulatory compliance, and observability improvements to deliver tangible business value and smoother user experiences. The work emphasized UI performance, robust form handling, and improved error triage through instrumentation.

December 2025

4 Commits • 4 Features

Dec 1, 2025

December 2025 monthly summary: Focused on delivering user-facing features, reliability improvements, and policy/configuration enhancements across City of Helsinki repositories. Key outcomes include improved Parking Area interaction on the map, more robust test behavior for embedded views, expanded pricing configuration with a new VAT option, and an increased override cap for monthly benefits with validation tests. These changes enhance user experience, reduce test flakiness, enable pricing flexibility, and improve policy compliance and data validation.

November 2025

6 Commits • 2 Features

Nov 1, 2025

November 2025 — City-of-Helsinki/servicemap-ui: Reliability, observability, and performance improvements delivering measurable business value. Key features and reliability work delivered: Sentry Vite plugin integration for error tracking (telemetry enabled via environment key); performance/data-model optimizations including storing parking areas as an object and API client refactor to reduce paginated calls. Major bugs fixed: Popup Stability Improvements (AddressPopup null checks; event delegation cleanup to prevent mobile close button from triggering navigation) and Robust Subway Stops Fetch (enhanced subwayResponse error handling in fetchStops). Overall impact: fewer runtime errors, faster data loading, and better error visibility, translating to smoother UX and reduced maintenance. Technologies demonstrated: JavaScript/TypeScript, React, error handling, event delegation, Sentry/Vite plugin, and data modeling/API client optimization.

Activity

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Quality Metrics

Correctness92.8%
Maintainability87.4%
Architecture87.4%
Performance87.4%
AI Usage21.0%

Skills & Technologies

Programming Languages

JavaScriptPythonSCSSTypeScript

Technical Skills

API DevelopmentDjangoFront End DevelopmentFrontend DevelopmentHooksJavaScriptREST APIReactReduxSentry integrationUI/UX designVitebackend developmentend-to-end testingerror tracking

Repositories Contributed To

4 repos

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

City-of-Helsinki/servicemap-ui

Nov 2025 Feb 2026
3 Months active

Languages Used

JavaScript

Technical Skills

API DevelopmentFrontend DevelopmentJavaScriptReactReduxVite

City-of-Helsinki/linkedcomponents-ui

Dec 2025 Jan 2026
2 Months active

Languages Used

TypeScriptJavaScriptSCSS

Technical Skills

Reactfront end developmentFront End DevelopmentHooksperformance optimization

City-of-Helsinki/yjdh

Dec 2025 Dec 2025
1 Month active

Languages Used

JavaScriptPython

Technical Skills

DjangoREST APIReactbackend developmentfrontend development

City-of-Helsinki/linkedregistrations-ui

Jan 2026 Jan 2026
1 Month active

Languages Used

JavaScript

Technical Skills

Sentry integrationerror trackingfull stack development

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