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Magento 2 in practice. Real implementations, real problems, and concrete solutions.
On kowal.blog, I publish case studies from projects we carry out at Kowal Sp. z o.o. – from SQL query and indexing optimization, through API integrations (Allegro, eMAG, ERP), to debugging difficult production errors.
No marketing jargon. Just code. Analysis. Conclusions.
If you are interested in: • Magento 2 performance optimization • problems with inventory_stock_x and MSI • M1 → M2 migrations • custom modules and B2B integrations • DevOps under Magento (Nginx, MariaDB, OpenSearch)
— you've come to the right place.
Topic: Indexing, SQL, MSI, cache, OpenSearch Magento only starts to slow down when the store begins to make money. I analyze real cases: long queries on catalog_category_product, problems with inventory_stock_x, blocking indexes, or poorly chosen JOINs. No generalizations — specific queries, execution plan analysis, and fixes that actually make a difference.
Topic: Problems that only occur in a "live" store Not everything can be reproduced on localhost. Race conditions in MSI, incorrect review aggregations, index loops, module conflicts — I describe cases that only occur under heavy traffic and with a large database.
Topic: Allegro, eMAG, ERP, API, custom modules Integration in Magento is not just about "connecting the API." I show you how to design modules so that they are stable: cron, CLI, retry, error logging, separation of responsibilities, handling large volumes of data. This approach works in the long term — not just in a demo.
Topic: M1 → M2, 200k+ products, data organization Migration is not CSV export. It involves attribute mapping, data cleaning, correct configuration of relationships, index optimization, and integrity checks. I share my experience from projects where scale really matters.
CEO
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Web developer
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