Janusz – PHP, Adobe Commerce, Magento

Canadian B2B online store selling refurbished enterprise-grade UPS systems and replacement batteries from brands like APC, Eaton, Tripp Lite, CyberPower, Vertiv and Liebert. It serves data centres, IT teams and offices that need reliable backup power without paying for new hardware.

• Own the store end to end as the only developer and architect on the project, working directly with the client;
• Set up the server environment the store runs on;
• Build the storefront from the client's mockups, along with the Magento 2 backend behind it;
• Structured the catalogue around refurbished UPS systems and replacement batteries across six brands;
• Deliver the store's integrations and ship every release.

Poland's lottery information portal, offering results, statistics and interactive tools for players. It serves around 100,000 unique visitors a day and has been running for over twenty years.

• Designed and built the whole platform single-handedly and keep developing it: results feeds, statistics, interactive features and the content pipeline;
• Keep the site fast and stable for 100,000 daily unique visitors on a single Debian VPS through caching, query tuning and capacity planning;
• Own operations end to end: Linux administration, security updates, backups, monitoring and incident response;
• Run the product side too, deciding which features and tools to build for players.

A B2B and retail e-commerce platform for a major Polish bicycle and motorcycle brand, replacing several separate online stores with one system. It runs three storefronts plus a B2B channel where every business customer sees its own live prices. It also keeps the brand's catalogue, stock and orders in sync with its back-office systems and online marketplaces.

• Consolidated the brand's separate Magento stores into one Magento 2 platform serving three storefronts and the B2B channel, with a headless Venia (PWA Studio) storefront;
• Led the Magento team and owned the platform architecture and integration design;
• Built live customer-specific B2B pricing, pulling prices from the ERP in real time through SQL Server stored procedures, so every B2B customer sees its own current prices;
• Integrated two ERP systems in both directions for products, prices, stock and orders;
• Delivered the Ergonode PIM integration as the single product catalogue and the BaseLinker integration connecting the marketplaces;
• Recommended Magento Open Source over Adobe Commerce for the heavily customised B2B pricing model, weighing licence cost against development effort, and built the B2B features on top of it.

Busy Polish online retailer of curtains and drapery, selling both ready-made products and fabric by the metre and taking hundreds of orders a day. The store needed to move off an end-of-life platform to one it could keep updating, without pausing sales.

• Migrated the store from Magento 1 to Magento 2 single-handedly within six months, while it kept trading at hundreds of orders a day until the switchover;
• Moved the full catalogue, including ready-made and by-the-metre products, along with customers and order history;
• Carried the store's SEO over to the new platform;
• Delivered the project as the sole developer, from planning to go-live;
• Left the client on a current Magento 2 store with modern modules and regular engine updates instead of a dead-end Magento 1 platform.

Global digital marketplace where gamers buy and sell game keys and software. It handles around 20,000 orders a day, and every order ends with a digital key delivered to the buyer.

• Moved digital-key storage from MySQL to MongoDB when the key tables became the main bottleneck at around 20,000 orders a day, keeping key delivery fast as volume grew;
• Led a development team on the Magento side of the marketplace (catalogue, orders and digital-key delivery) while engineering scaled from a handful of developers to about 100;
• Introduced RabbitMQ-based asynchronous processing between Magento and the surrounding services for order and key workflows;
• Integrated Magento with Node.js microservices, Solr search and REST APIs;
• Reviewed code, set technical standards, mentored developers and interviewed new hires.