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Volodymyr Rohach

PROFILE

Volodymyr Rohach

Volodymyr Rohach contributed to core FOLIO repositories by building and optimizing backend features that improved data import reliability, database performance, and system maintainability. He enhanced the mod-source-record-storage and mod-inventory modules by implementing SQL optimizations, Java 21 upgrades, and robust error handling, addressing issues like MARC record persistence and composite record retrieval speed. Volodymyr refactored API endpoints, introduced stored procedures for cleanup workflows, and expanded test coverage to ensure data integrity and accurate event emission. His work, primarily in Java and SQL with Docker-based CI/CD, demonstrated a deep understanding of backend architecture and delivered measurable improvements in reliability and maintainability.

Overall Statistics

Feature vs Bugs

59%Features

Repository Contributions

22Total
Bugs
7
Commits
22
Features
10
Lines of code
1,896
Activity Months6

Work History

April 2025

2 Commits

Apr 1, 2025

Concise monthly summary for 2025-04 highlighting key business and technical accomplishments in folio-org/mod-inventory. Focused on preserving data integrity in MARC bib records and ensuring correct UI behavior during holdings edits. Delivered two critical bug fixes with added test coverage and documentation updates, reinforcing cataloging data quality and system reliability.

March 2025

5 Commits • 4 Features

Mar 1, 2025

March 2025 monthly summary focusing on business value and technical achievements across core data import, record storage, and inventory modules. Key efforts centered on modernizing the Java runtime to 21, stabilizing CI/CD/build pipelines, and documenting migrations, while also addressing a critical MARC Search timeout to improve reliability for tenants. Highlights include multi-repo Java 21 upgrades, CI/CD/Dockerfile adjustments, build tool updates, and targeted bug fixes that reduce risk and enable faster feature delivery.

February 2025

2 Commits • 1 Features

Feb 1, 2025

February 2025 performance month: Delivered targeted improvements in two repositories to strengthen data access performance and reliability. In mod-source-record-storage, implemented a database index to speed up retrieval of composite records (MODSOURCE-863), updated the changelog, and adjusted index creation to remove CONCURRENTLY as part of the change. In mod-source-record-manager, corrected error handling for duplicate submissions by returning BadRequestException instead of a 500 error (MODSOURMAN-1281), improving clarity for API consumers. These changes advance business value by reducing query latency for composite records and providing precise error feedback for duplicate submissions, supported by clear documentation and traceability to the original issues. Technologies demonstrated include Postgres indexing strategies, error-type design, and cross-repo collaboration.

January 2025

4 Commits • 1 Features

Jan 1, 2025

January 2025 monthly summary focusing on key accomplishments across four core repositories. Delivered critical bug fixes, performance visibility improvements, and API migrations that enhance reliability, data integrity, and business continuity. The work supports smoother data imports, accurate order creation with complex vendor data, and up-to-date integration endpoints.

December 2024

1 Commits • 1 Features

Dec 1, 2024

December 2024 performance-focused delivery for the mod-source-record-storage repository. Delivered MARC indexer cleanup optimization by refactoring the cleanup flow to use a stored procedure and updated tracking tables, addressing performance issues associated with long-running cleanups (MODSOURCE-834). The change is implemented and committed under a single change set to improve efficiency, maintainability, and scalability of the MARC indexing workflow.

November 2024

8 Commits • 3 Features

Nov 1, 2024

November 2024 focused on stabilizing data imports, improving test data fidelity, and expanding data visibility across core repos. Folio integration tests delivered Data Import Reliability Improvements (longer retries, timeouts, and pauses) to reduce flaky imports and stabilize EDIFACT processing, along with Data Import Test Data Accuracy and Field Handling to reflect real-world MARC/OCLC variations. Mod-source-record-storage added Batch Parsed Records Fetch: Include Deleted Records, introducing an includeDeleted parameter and SQL adjustments to return ACTUAL or DELETED records, with tests updated for scenarios with and without deleted data.

Activity

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Quality Metrics

Correctness86.4%
Maintainability85.4%
Architecture79.2%
Performance76.4%
AI Usage20.0%

Skills & Technologies

Programming Languages

DockerfileGherkinGroovyJavaJavaScriptMARCMarkdownSQLYAML

Technical Skills

API DevelopmentAPI IntegrationAPI TestingBackend DevelopmentBug FixingBuild AutomationBuild ToolsCI/CDContainerizationData HandlingData ImportData ProcessingDatabase ManagementDatabase OptimizationDevOps

Repositories Contributed To

5 repos

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

folio-org/folio-integration-tests

Nov 2024 Nov 2024
1 Month active

Languages Used

GherkinMARC

Technical Skills

API TestingData ImportIntegration TestingMARC RecordsTest Automation

folio-org/mod-source-record-storage

Nov 2024 Mar 2025
5 Months active

Languages Used

JavaSQLDockerfileMarkdownYAML

Technical Skills

API DevelopmentBackend DevelopmentDatabase ManagementJavaSQLLogging

folio-org/mod-inventory

Jan 2025 Apr 2025
3 Months active

Languages Used

JavaDockerfileMarkdownYAML

Technical Skills

API IntegrationBackend DevelopmentBuild ToolsCI/CDContainerizationJava Development

folio-org/mod-source-record-manager

Jan 2025 Mar 2025
3 Months active

Languages Used

JavaJavaScriptMarkdownDockerfileGroovyYAML

Technical Skills

Backend DevelopmentEvent-Driven ArchitectureTestingAPI DevelopmentError HandlingBuild Automation

folio-org/data-import-processing-core

Jan 2025 Mar 2025
2 Months active

Languages Used

JavaGroovy

Technical Skills

Backend DevelopmentData ProcessingJava DevelopmentBuild AutomationCI/CD

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