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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.
Posted on 28th Jun 2026
In most online stores, the answer to the question “what actually sells?” only seems simple. We see traffic. We see clicks. We see page views. But that still does not tell us which storefront elements actually lead to carts, orders, and revenue. A related products section may have a decent CTR,...
Posted on 20th Jun 2026
Email Marketing for Magento - how the modules and packages work from signup to analytics Many stores still treat the newsletter in Magento as a simple add-on: a signup form, a list of email addresses, and an occasional campaign send. But when you look at this set of modules more broadly, you see s...
Posted on 1st Jun 2026
How to implement AI in Magento 2 so it makes business sense Artificial intelligence in ecommerce can easily become a fashionable add-on that looks good in a presentation but changes very little in the day-to-day work of the store. In Magento 2 this is especially visible. Stores try to launch a cha...
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In most online stores, the answer to the question “what actually sells?” only seems…
Sentry in Magento 2: technical store observability with the Kowal_Sentry module What…
