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Exceeds
Timo Juonoja

PROFILE

Timo Juonoja

Worked across City-of-Helsinki repositories to deliver user-facing features, performance improvements, and reliability fixes, with a focus on frontend development using React, JavaScript, and TypeScript. Enhanced the servicemap-ui by optimizing API clients, integrating Sentry for error tracking, and refactoring data models for faster lookups. Improved accessibility and privacy compliance in linkedcomponents-ui, updated VAT configurations to align with regulations, and strengthened code quality through ESLint and dependency updates. Addressed UI stability by implementing robust null checks and improved test automation for embedded views. The work emphasized maintainability, regulatory alignment, and smoother user experiences through careful attention to detail and technical rigor.

Overall Statistics

Feature vs Bugs

72%Features

Repository Contributions

25Total
Bugs
5
Commits
25
Features
13
Lines of code
4,513
Activity Months7

Work History

May 2026

1 Commits

May 1, 2026

May 2026 monthly summary for City-of-Helsinki/servicemap-ui: Delivered a critical bug fix to the ContactInfo Accessibility tab, improving UI stability and preventing runtime errors when null/undefined references are encountered during accessibility tab rendering. The fix reinforces safe access patterns and reduces incident risk in production.

April 2026

1 Commits • 1 Features

Apr 1, 2026

Month 2026-04: Focused on code quality and dependency hygiene in City-of-Helsinki/linkedcomponents-ui. Delivered Code Quality Improvements and Dependency Updates by updating dependencies and enhancing ESLint configuration to strengthen code quality, consistency, and maintainability. Commit involved: e1aaacdb43434921da03cba6ef902ed8aa4fcde2 (Refs: KEH-281). No major bugs fixed this month; primary work was reducing technical debt and preparing the repo for smoother future upgrades. Impact includes improved code reliability, easier maintenance, and faster onboarding for new contributors, translating to lower risk and quicker iteration cycles. Technologies/skills demonstrated: ESLint configuration, dependency management, code quality practices, tooling hygiene, and release stewardship.

March 2026

4 Commits • 2 Features

Mar 1, 2026

March 2026 monthly summary for City of Helsinki developer work focusing on accessibility, privacy/compliance, and robust date handling across UIs. Highlights include four key deliveries across three repositories: improved mobile UI accessibility, privacy policy and text updates, data protection URL updates for multi-language support, and frontend date parsing/time zone handling to ensure Helsinki-specific correctness.

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

Correctness93.6%
Maintainability88.0%
Architecture88.0%
Performance88.0%
AI Usage21.6%

Skills & Technologies

Programming Languages

JSONJavaScriptPythonSCSSTypeScript

Technical Skills

API DevelopmentDjangoESLintFront End DevelopmentFrontend DevelopmentHooksJavaScriptNode.jsREST APIReactReduxSentry integrationUI/UX designVitebackend development

Repositories Contributed To

5 repos

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

City-of-Helsinki/linkedcomponents-ui

Dec 2025 Apr 2026
4 Months active

Languages Used

TypeScriptJavaScriptSCSS

Technical Skills

Reactfront end developmentFront End DevelopmentHooksperformance optimizationi18n

City-of-Helsinki/servicemap-ui

Nov 2025 May 2026
4 Months active

Languages Used

JavaScript

Technical Skills

API DevelopmentFrontend DevelopmentJavaScriptReactReduxVite

City-of-Helsinki/linkedregistrations-ui

Jan 2026 Mar 2026
2 Months active

Languages Used

JavaScriptJSONTypeScript

Technical Skills

Sentry integrationerror trackingfull stack developmentReactfront end development

City-of-Helsinki/yjdh

Dec 2025 Dec 2025
1 Month active

Languages Used

JavaScriptPython

Technical Skills

DjangoREST APIReactbackend developmentfrontend development

City-of-Helsinki/tilavarauspalvelu-core

Mar 2026 Mar 2026
1 Month active

Languages Used

TypeScript

Technical Skills

Reactfrontend development