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Georgios Mantzounis

PROFILE

Georgios Mantzounis

Over ten months, contributed to RedHatInsights/rhsm-subscriptions by delivering seventeen features and resolving critical bugs, focusing on backend reliability, billing accuracy, and integration with partner systems. Developed and tested REST APIs, Kafka consumers, and database migration strategies using Java, Spring Framework, and Quarkus. Enhanced contract synchronization, utilization threshold alerting, and security enforcement for organization-level preferences, while maintaining robust test coverage with JUnit and containerized environments. Improved notification workflows in notifications-backend by implementing proactive usage alerts and template rendering. Prioritized maintainability through code cleanup, documentation updates, and configuration management, ensuring scalable, secure, and auditable subscription management across multi-cloud environments.

Overall Statistics

Feature vs Bugs

81%Features

Repository Contributions

30Total
Bugs
4
Commits
30
Features
17
Lines of code
9,773
Activity Months10

Work History

June 2026

1 Commits

Jun 1, 2026

June 2026 monthly summary for the rhsm-subscriptions project focused on security and policy enforcement for org-level utilization settings. Implemented robust org-admin authorization on the Utilization Org-Preferences endpoint, preventing unauthorized writes and aligning behavior with governance requirements. Completed testing and validation in containerized environments to ensure reliability before rollout.

May 2026

3 Commits • 2 Features

May 1, 2026

Concise monthly summary for 2026-05 focusing on feature delivery, bug fixes, and overall impact across two repositories: notifications-backend and rhsm-subscriptions. Highlights include the proactive subscription usage notification event template in notifications-backend and robust contract synchronization fixes plus code cleanup in rhsm-subscriptions. All changes were tested with unit/component tests and containerized verification, delivering tangible business value with improved reliability, data integrity, and maintainability.

April 2026

4 Commits • 2 Features

Apr 1, 2026

April 2026 highlights: Delivered Kafka-based IT Partner integration, improved UX with a default organization threshold, and expanded test coverage for utilization APIs, while maintaining system stability via a controlled revert when stage topic readiness issues were detected for the partner gateway consumer. Technologies demonstrated include Java/Maven, Kafka, REST endpoints, and a robust testing approach (component and integration tests) with containerized test setups.

March 2026

4 Commits • 2 Features

Mar 1, 2026

March 2026 (2026-03) monthly summary for RedHatInsights/rhsm-subscriptions focusing on testing and reliability improvements and documentation cleanup. Key outcomes: improved alerting fidelity for Resource Utilization Threshold, enhanced tests for overage detection and multi-resource processing, updated cross-product measurement approach, and documentation cleanup removing deprecated DISABLE_OTEL references. Impact: increased confidence in utilization alerts, reduced cross-product measurement gaps, and improved maintainability.

February 2026

2 Commits • 1 Features

Feb 1, 2026

February 2026: Delivered the Offerings Reconciliation Feature for rhsm-subscriptions, introducing a new API endpoint for forced reconciliation of capacity based on subscriptions. Implemented end-to-end tests and Kafka consumer tests to verify robustness and data integrity, substantially improving provisioning accuracy and reducing manual remediation.

January 2026

5 Commits • 3 Features

Jan 1, 2026

January 2026: Focused on improving cross-cloud data integrity, scalable capacity management, and simplified utilization validation for the rhsm-subscriptions product. Delivered features across multi-cloud contracts, capacity reporting, and PAYG/non-PAYG utilization handling. These efforts improve cross-cloud billing accuracy, reporting capabilities, and validation usability, while enabling more reliable data exchange and scalable workflows across AWS and Azure.

December 2025

1 Commits • 1 Features

Dec 1, 2025

December 2025 monthly summary for RedHatInsights/rhsm-subscriptions focused on increasing reliability and business value through automated contract synchronization testing across organizations. The key delivery is end-to-end automated tests that validate contract creation, updates, and deletions during the sync process, ensuring correct behavior and reducing regression risk in multi-tenant environments. This work enhances product trust for customers relying on accurate subscription management and supports faster feedback in CI pipelines. Demonstrated strong test automation discipline, traceability to requirements, and readiness for broader test coverage in future sprints.

November 2025

8 Commits • 5 Features

Nov 1, 2025

2025-11 monthly summary: Focused on stabilizing billing data, streamlining account reset flows, and improving deployment flexibility. Delivered five major enhancements with robust test coverage, resulting in improved billing accuracy, proactive customer notifications, reduced maintenance burden, and clearer configuration management across environments. Key outcomes include streamlined account reset flows, hourly billable usage processing with validation tests, over-usage detection with product-specific thresholds, threshold-based utilization notifications, and development profile configuration for dev/prod parity. These changes reduce billing risk, improve customer transparency, and accelerate deployment readiness.

October 2025

1 Commits • 1 Features

Oct 1, 2025

Month 2025-10: Delivered a database migration refactor in RedHatInsights/rhsm-subscriptions, moving scripts from a dedicated migrations directory to the contracts directory; introduced a new ClowdApp for database changelog cleanup; adjusted Liquibase configuration to be managed by the Quarkus extension, simplifying migrations and improving separation of concerns.

September 2025

1 Commits

Sep 1, 2025

For 2025-09, the RHSM Subscriptions team delivered a focused bug fix to improve Azure subscription lookup error handling and bolster test coverage in RedHatInsights/rhsm-subscriptions. The change ensures consistent reporting when an Azure subscription is not found by introducing a 404 scenario in AzureWiremockService and adding a corresponding test in SimpleAzureComponentTest to verify SUBSCRIPTION_NOT_FOUND reporting. The work is backed by commit 6a9972089da9f68d867d553897f7c2bb8977bc6f (SWATCH-3906).

Activity

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Quality Metrics

Correctness92.6%
Maintainability82.6%
Architecture86.0%
Performance81.4%
AI Usage21.4%

Skills & Technologies

Programming Languages

HTMLJavaMarkdownPropertiesXMLYAML

Technical Skills

API DevelopmentAPI IntegrationAPI TestingAPI developmentAPI integrationAPI testingComponent TestingConfiguration ManagementDatabase MigrationDevOpsIntegration TestingJUnitJavaJava DevelopmentKafka

Repositories Contributed To

2 repos

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

RedHatInsights/rhsm-subscriptions

Sep 2025 Jun 2026
10 Months active

Languages Used

JavaXMLPropertiesYAMLMarkdown

Technical Skills

API IntegrationJava DevelopmentTestingWiremockConfiguration ManagementDatabase Migration

RedHatInsights/notifications-backend

May 2026 May 2026
1 Month active

Languages Used

HTMLJava

Technical Skills

backend developmentemail notification systemstemplate rendering