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Kacper Chełstowski

PROFILE

Kacper Chełstowski

Kamil Chelstowski developed and enhanced inventory management and reporting features for the openboxes/openboxes repository, focusing on data integrity, performance, and traceability. He designed and implemented robust APIs, batch processing workflows, and domain models using Groovy, JavaScript, and SQL, enabling efficient cycle counting, accurate transaction reporting, and end-to-end provenance of inventory movements. His work included backend optimizations, frontend integration with React, and database query tuning to improve operational efficiency and audit readiness. By addressing complex data validation, error handling, and migration scenarios, Kamil delivered maintainable solutions that improved reliability, reduced manual effort, and supported scalable warehouse operations.

Overall Statistics

Feature vs Bugs

60%Features

Repository Contributions

87Total
Bugs
17
Commits
87
Features
26
Lines of code
7,968
Activity Months13

Work History

October 2025

1 Commits • 1 Features

Oct 1, 2025

October 2025 monthly summary for openboxes/openboxes focusing on business value and technical achievements. Delivered a new TransactionSource domain to enable end-to-end provenance by mapping transactions to their originating entities (shipments, receipts, and orders) and logging historical actions. The domain includes audit fields (createdBy, updatedBy, createdDate, updatedDate) and a retrieval method to fetch associated transactions, enhancing traceability and auditability across the transaction lifecycle. This work lays the groundwork for improved analytics and compliance reporting, and integrates with the existing transaction logging model with minimal coupling.

September 2025

6 Commits • 1 Features

Sep 1, 2025

September 2025 — openboxes/openboxes monthly summary. This report highlights key features delivered, major bugs fixed, overall impact, and skills demonstrated, with a focus on improving stock reporting reliability and business value. Key features delivered: - Inventory Transactions Report: Performance and Correctness Improvements. Removed the SQL view and implemented a service-layer using native SQL for the inventory transactions report, complemented by corrections to quantity calculations and negation logic to improve accuracy. Major bugs fixed: - Fixed wrong quantity calculation in the inventory transactions report and ensured event publishing after transaction save/update to keep inventory counts and summaries in sync. - Standardized quantity negation logic across services for damaged, expired, and consumed items to ensure consistent inventory summaries. - Fixed last counted date by excluding baseline migration-related transactions and refined handling to ensure reporting accuracy. - Included transactions with null comments in inventoried indicators by adjusting query conditions, improving accuracy across services and migrations. - Modified SQL views to exclude migration-related transactions from counts by filtering out specific migration comments, preventing skew from historical data. Overall impact and accomplishments: - Significantly improved stock reporting reliability, leading to more accurate inventory counts and faster, more trustworthy operational decisions. - Enhanced data integrity during migrations and across services, reducing reporting inconsistencies and edge-case errors. - Reduced maintenance overhead by standardizing logic and consolidating data handling paths. Technologies and skills demonstrated: - Java service-layer design and refactoring, native SQL usage, and removal of legacy SQL views for performance gains. - Query optimization and data filtering to ensure accurate reporting across migrations. - Event-driven consistency for inventory updates and robust data reconciliation across services. - Data migration awareness, artifact handling, and capability to adapt reports to evolving data models.

August 2025

12 Commits • 2 Features

Aug 1, 2025

Month: 2025-08 — Summary of key features delivered, major bugs fixed, overall impact, and technologies demonstrated for openboxes/openboxes. Key features delivered include the Inventory Count Dates API/UI enhancement and performance-focused improvements to Inventory Transactions Reporting. Major bugs fixed addressed data integrity and correctness in inventory transactions reporting, including quantity_before/quantity_after calculations, joins across facilities/products (MariaDB), and display mappings. Overall impact: improved data accuracy, faster, more reliable reporting, and better audit readiness. Technologies/skills demonstrated: SQL and database optimization (MariaDB), helper and pre-aggregated views, explicit joins and indexing, API design, backend refactoring, and frontend integration for last-count date visibility.

July 2025

7 Commits • 3 Features

Jul 1, 2025

July 2025 (2025-07) monthly summary for openboxes/openboxes. Delivered major feature enhancements to inventory reporting and batch cycle count workflows, improved stock history clarity, and addressed MySQL performance bottlenecks. These efforts improved reporting accuracy, batch processing throughput, and overall system responsiveness, enabling faster operational decision-making for warehouse operations and inventory control.

June 2025

5 Commits • 1 Features

Jun 1, 2025

Month: 2025-06 | Repository: openboxes/openboxes. This month focused on strengthening data integrity in inventory workflows, improving user feedback, and enhancing historical reporting through targeted feature work and bug fixes. The work delivered provides measurable business value by ensuring import reliability, smoother user interactions, and more accurate inventory history.

May 2025

5 Commits • 2 Features

May 1, 2025

May 2025 — OpenBoxes cycle-count workflow enhancements focused on bulk operations and robust data import. Features delivered: Batch Cycle Count Item Management (batch create/update endpoints with reuse of existing inventory items and proper flush for subsequent items) and Excel Import Enhancements for Cycle Count Items (UI dropzone for import, improved import/export, and handling of updated/non-custom rows for accurate bulk updates). Major bugs fixed: fixes to batch creation when items share the same inventory and corrections ensuring non-custom rows are updated from import. Impact: reduced manual processing, faster cycle counts, improved data integrity, and a smoother user experience for bulk updates. Technologies/skills demonstrated: backend batch processing, REST endpoints, UI dropzone integration, data import workflows, and robust handling of bulk inventory data.

April 2025

11 Commits • 3 Features

Apr 1, 2025

April 2025 OpenBoxes monthly summary: Key features delivered: - Cycle Count Discrepancies Detection and Reporting: Added a UI component to surface discrepancies when inventories are removed or updated during a count, and improved handling of items not recounted. - Robust Cycle Count Refresh and Cancellation Handling: Refined the refresh flow to target relevant items, remove out-of-stock items, support count-index-based refresh, and ensure canceled cycle counts are cleanly canceled in the store. - Canceled Cycle Counts Notification and Validation: Introduced validation to ensure cycle counts are active before actions (save/proceed) and added user notifications when canceled cycle counts are detected, prompting a reload. - UX/UX-consistency improvements: Preserved internal location filter state across page refresh for consistent display. Major bugs fixed: - Cycle Count Item Deduplication and Missing Items Bug: Fixed issues with items not being properly removed or recognized due to deduplication in SortedSet; ensured uniqueness by including item ID in compareTo and using identity hash codes for items without IDs, preventing missing items in cycle count processing. - Reload/empty item handling: Fixed reload issues for empty cycle count items and related edge cases to improve reliability. Overall impact and accomplishments: - Improved accuracy and reliability of cycle counting, reducing post-count discrepancies and manual reconciliation efforts. - Faster, more robust refresh cycles with correct handling of stock removals and cancellations, leading to smoother operations and fewer user-facing errors. - Enhanced user guidance and UX stability through validation prompts and preserved filter states, resulting in higher user satisfaction and adoption. Technologies/skills demonstrated: - Java collections and algorithm reliability (SortedSet, compareTo, identityHashCode) to ensure item uniqueness. - Front-end UI integration for discrepancy display and user-facing validation prompts. - Redux store management for cycle count state cleanup and cancellation handling; improved data flow between backend and UI. - End-to-end feature delivery with traceable commits (OBPIH-7169, OBPIH-7170, OBPIH-7202, OBPIH-7237, OBPIH-7231, OBPIH-7237 additional items).

March 2025

16 Commits • 3 Features

Mar 1, 2025

Monthly summary for 2025-03 focusing on openboxes/openboxes cycle counting improvements. Highlights include robust cycle count creation and data integrity enhancements (correct QOH fetch for new inventory items, nullable bin locations, null expiration handling, and lot-number whitespace trimming), lifecycle and status correctness fixes to prevent null pointer errors and ensure safe submission, draft workflow to resume/discard unfinished counts, and a new Pending Cycle Count Requests API to accelerate inventory workflows. UI/translation improvements address loading issues, state naming, and save button behavior, including handling of zero-QOH scenarios. Delivered changes reduce data inconsistencies, streamline counting workflows, and improve operator productivity. Technologies exercised include Java backend work for API and business logic, data cleaning and null-safety patterns, and UI/i18n improvements for a smoother user experience. Business value includes higher cycle-count accuracy, faster processing, and safer submissions across warehouse operations.

February 2025

8 Commits • 2 Features

Feb 1, 2025

February 2025: Delivered end-to-end Cycle Count enhancements in the openboxes/openboxes repo, enabling batch workflows, item-level management, and improved data fidelity. The work spanned API design, frontend integration, and lifecycle orchestration, with significant data model improvements and user-assignment capabilities that lay the groundwork for scalable warehouse counting and better inventory accuracy.

January 2025

2 Commits • 1 Features

Jan 1, 2025

January 2025 monthly summary for the openboxes/openboxes repository. Key features delivered focus on Cycle Count workflow enhancements; no major bugs reported this month; improvements drive faster inventory checks with higher data integrity and reduced manual effort. Demonstrates strong API design, validation, and maintainability through URL/view mapping refinements and batch processing capabilities.

December 2024

5 Commits • 2 Features

Dec 1, 2024

December 2024 — Focused on reliability, data integrity, and inventory efficiency in openboxes/openboxes. Delivered four items: (1) Outbound Import Error Handling: improved error notifications, halted processing on errors, and ensured the loading spinner hides on data validation failures; (2) Comments Management for PO shipments: added a comments tab with full CRUD, refactored comment handling to be generic across requisitions and shipments, and introduced an isReturn flag to prevent commenting on returns; (3) Rollback Reliability Enhancement: introduced mostRecentSystemEvent to ensure rollbacks consider only relevant events for reliability; (4) Cycle Count Inventory Management: added UI routing and backend support with a candidates API to fetch items to count. This work reduces user disruption, improves data integrity, and accelerates inventory checks. Technologies/skills demonstrated include backend API design, frontend routing, code refactoring for generic components, robust error handling, and reliable rollback logic.

November 2024

8 Commits • 4 Features

Nov 1, 2024

Nov 2024 monthly summary for openboxes/openboxes focusing on performance, accuracy, and traceability. Delivered backend putaway performance optimization, correctness fix for shipment quantity editing across brands, stability improvements for null bin locations in putaway, product filtering by Handling Requirements across API/service/UI, and a Historizable shipment history framework enabling end-to-end event tracking. These changes reduce database load, prevent crashes, improve product selection, and enable comprehensive audit trails, demonstrating backend refactor, safe navigation, OR-filter logic, and history architecture.

October 2024

1 Commits • 1 Features

Oct 1, 2024

Month: 2024-10 — Focused on improving data integrity in the receiving flow. Delivered a targeted feature that adds a visual indicator and error messaging when the total edited quantity of a split line does not equal the original shipped quantity. The change reduces receiving errors in partial receipts, improving inventory accuracy and operational efficiency. The work is tied to OBPIH-6707 and implemented in openboxes/openboxes. Key benefits: more accurate stock counts, faster reconciliation, and clearer operator guidance. Technologies: front-end UI, validation logic, styling, and commit-level traceability.

Activity

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Quality Metrics

Correctness84.8%
Maintainability83.8%
Architecture79.2%
Performance78.4%
AI Usage20.2%

Skills & Technologies

Programming Languages

GSPGroovyJSXJavaJavaScriptSCSSSQL

Technical Skills

API DevelopmentAPI IntegrationBackend DevelopmentBatch ProcessingBug FixingData ImportData MigrationData ValidationDatabaseDatabase DesignDatabase ManagementDatabase OptimizationDatabase Query OptimizationDatabase Schema ManagementDomain Modeling

Repositories Contributed To

1 repo

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

openboxes/openboxes

Oct 2024 Oct 2025
13 Months active

Languages Used

JavaJavaScriptSCSSGroovyJSXGSPSQL

Technical Skills

Front End DevelopmentInternationalizationReactUI/UX DevelopmentAPI DevelopmentBackend Development

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