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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 2026-04-10 16:26
Sentry in Magento 2: technical store observability with the Kowal_Sentry module What Sentry is and what it is actually used for Sentry is most often associated with error tracking, but in practice it is an observability platform that combines several layers of application diagnostics: except...
Posted on 2026-04-04 20:27
In many Magento 2 projects, the topic of product recommendations starts with a simple assumption: you need to show the customer a few extra products on the product page, in the cart, or during checkout. The problem appears very quickly. Magento's standard related, upsell, and cross-sell mechan...
Posted on 2026-03-26 01:28
AI moderates and translates reviews in Magento 2 Customer reviews are one of the most important elements of sales in e-commerce. They build trust, increase conversion, and often determine whether a customer buys a product. The problem starts when a store operates in many countries and has m...
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Sentry in Magento 2: technical store observability with the Kowal_Sentry module What…
In many Magento 2 projects, the topic of product recommendations starts with a simple…
