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Jonas Klingstedt

PROFILE

Jonas Klingstedt

Jonas Klingstedt developed and enhanced backend services for Sundsvallskommun, focusing on the api-service-invoice-sender and api-service-messaging repositories. He architected multi-environment scheduling for invoice processing, introducing dynamic Cron-based triggers and municipality-based routing using Java and Spring Boot. In api-service-messaging, Jonas improved snail-mail batch reliability by refactoring delivery logic and strengthening error handling. He integrated the Citizen API for address validation, expanded test coverage with JUnit 5 and Testcontainers, and updated OpenAPI specifications to ensure data accuracy. His work demonstrated depth in configuration management, integration testing, and robust error handling, resulting in more reliable, scalable, and maintainable backend systems.

Overall Statistics

Feature vs Bugs

60%Features

Repository Contributions

6Total
Bugs
2
Commits
6
Features
3
Lines of code
7,469
Activity Months3

Work History

January 2025

4 Commits • 2 Features

Jan 1, 2025

January 2025: Delivered core enhancements to address fetching for snail mail via Citizen API, fixed the address application path, and strengthened invoice processing reliability. Achieved broader test coverage, updated OpenAPI specs, and improved validation and error handling, leading to higher data accuracy, delivery reliability, and faster feedback cycles.

November 2024

1 Commits

Nov 1, 2024

November 2024: Delivered reliability improvements for snail-mail batch delivery in Sundsvallskommun/api-service-messaging by refactoring batch processing to be driven by delivery statuses, with enhanced logging and error handling. These changes improved delivery reliability and observability, reduced manual follow-ups, and lay groundwork for scalable batch processing.

October 2024

1 Commits • 1 Features

Oct 1, 2024

October 2024 monthly summary: Focused on building the foundation for multi-environment Raindance support within the invoice service. Groundwork completed to enable multiple Raindance environments and dynamic scheduling, with per-environment configuration properties and municipality-based routing in the InvoiceProcessor. Scheduling logic now supports CronTriggers per batch for flexible timing. No major defects fixed this month; the emphasis was on architectural enhancements to enable scalable, multi-tenant deployments and smoother onboarding of municipalities.

Activity

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Quality Metrics

Correctness83.4%
Maintainability80.0%
Architecture76.6%
Performance68.4%
AI Usage26.6%

Skills & Technologies

Programming Languages

JavaXMLYAML

Technical Skills

API DevelopmentAPI IntegrationAssertJAwaitilityBackend DevelopmentConfiguration ManagementData ValidationDockerFeign ClientFile ProcessingIntegrationIntegration TestingJUnit 5JacocoJava

Repositories Contributed To

2 repos

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

Sundsvallskommun/api-service-invoice-sender

Oct 2024 Jan 2025
2 Months active

Languages Used

JavaXMLYAML

Technical Skills

Configuration ManagementFile ProcessingIntegrationJavaSMB/CIFSScheduling

Sundsvallskommun/api-service-messaging

Nov 2024 Jan 2025
2 Months active

Languages Used

JavaYAML

Technical Skills

API DevelopmentBackend DevelopmentJavaSpring BootAPI IntegrationAssertJ

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