Two production systems — the problem, the decisions, the data flow and the results behind each one.
Sole engineer and tech lead: architecture, payments and cloud infrastructure for a membership platform serving 3,000+ members across CN and US domains.
Owned the payment gateway for a cross-border e-commerce platform: front-to-back integration and the data flow behind it, with local payment providers per country and €100K–1M+ a month in volume.