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Joona Haavisto

PROFILE

Joona Haavisto

Joona Haavisto developed and enhanced payment, notification, and validation systems for the Opetushallitus/ataru repository, focusing on automation, maintainability, and reliability. He implemented features such as automated payment reminders, multilingual email templates, and mass update capabilities for application review states, using Clojure, ClojureScript, and SQL. His work included refactoring validation logic for clearer user feedback, integrating VAT support into payment workflows, and improving backend reliability through robust scheduling and state management. By connecting new features with existing email and event-driven systems, Joona reduced manual intervention, improved data quality, and ensured that business processes aligned with operational requirements.

Overall Statistics

Feature vs Bugs

100%Features

Repository Contributions

10Total
Bugs
0
Commits
10
Features
9
Lines of code
17,783
Activity Months7

Work History

October 2025

1 Commits • 1 Features

Oct 1, 2025

October 2025 (Month: 2025-10) – Developer monthly summary for Opetushallitus/ataru. Focused on delivering automated collections capabilities by implementing a Payment Reminder System for Decision Fees. The system introduces a new reminders table, a cron-based dispatcher, and integration with email and event systems. It includes deduplication logic and status tracking to ensure reliable reminders and prevent duplicate communications, reducing manual follow-up. No major bugs reported this period; emphasis was on feature delivery, reliability, and measurable business value.

April 2025

3 Commits • 3 Features

Apr 1, 2025

April 2025 monthly summary highlighting key features delivered, major fixes, and impact across Opetushallitus projects (ataru and kouta-backend). Delivered mass update functionality for application review states (tutu/astu) with refined UI, implemented payment-based processing for ASHA transfers for tutu forms with tests, and enhanced hakukohde display name generation in kouta-backend with reliable fallbacks. These efforts improved efficiency, data correctness, and reliability, complemented by expanded test coverage and CI/CD readiness.

March 2025

1 Commits • 1 Features

Mar 1, 2025

March 2025: Delivered targeted improvements to form validation for Opetushallitus/ataru, focusing on numeric input error handling, clearer user feedback, and a modular validation error namespace to improve maintainability and reuse across the application.

February 2025

1 Commits • 1 Features

Feb 1, 2025

February 2025 monthly summary for Opetushallitus/ataru: Implemented an automated reminder system for information requests, including scheduling, configurable delays, safeguards to avoid reminders after updates, and logging of reminder events and processing times. This work enhances follow-up efficiency and SLA adherence.

December 2024

1 Commits • 1 Features

Dec 1, 2024

December 2024 monthly summary for Opetushallitus/ataru: Delivered multilingual email templates (English and Swedish) and implemented a payment poller reliability fix, enhancing localization and backend reliability. The changes improve business communications, invoicing accuracy, and operational stability.

November 2024

2 Commits • 1 Features

Nov 1, 2024

November 2024 monthly performance: Implemented ASTU Payments enhancements in Opetushallitus/ataru, including Email Templates, Confirmation Messaging, and VAT (ALV) support. Refactored email logic for decision payments; updated processing states and confirmation messages for form submissions and edits; added percent-based VAT and order prefixes. UI and email templates updated to reflect VAT details, improving accuracy of financial transactions and customer communications. Highlights: aligned payments workflow with business rules, improved invoicing clarity, and reduced manual reconciliation effort.

October 2024

1 Commits • 1 Features

Oct 1, 2024

Month: 2024-10. Focused on delivering features that improve payment traceability and maintainability. Key outcome: enhanced payment metadata association and details URL refactor in Opetushallitus/ataru, enabling better reconciliation and traceability of payments tied to form names. No critical bugs fixed this period. Refactoring moved form type checking to a more appropriate namespace to improve maintainability and reduce risk of regressions. Overall, demonstrated strong execution, collaboration within the Opetushallitus/ataru repo, and adherence to best practices.

Activity

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Quality Metrics

Correctness86.0%
Maintainability82.0%
Architecture81.0%
Performance80.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

BashClojureClojureScriptEDNHTMLLessSQLScalaTypeScript

Technical Skills

API DevelopmentAutomated TasksBackend DevelopmentBackend IntegrationCI/CDClojureClojureScriptConfiguration ManagementDatabase ManagementEmail IntegrationEmail NotificationsEmail TemplatingForm ValidationFrontend DevelopmentIntegration Testing

Repositories Contributed To

2 repos

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

Opetushallitus/ataru

Oct 2024 Oct 2025
7 Months active

Languages Used

ClojureClojureScriptHTMLLessEDNSQLBashTypeScript

Technical Skills

Backend IntegrationClojureClojureScriptFrontend DevelopmentBackend DevelopmentEmail Templating

Opetushallitus/kouta-backend

Apr 2025 Apr 2025
1 Month active

Languages Used

Scala

Technical Skills

API DevelopmentBackend Development

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