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On the marketplace, sellers pay per view — bid too high and a $100 product loses money before it's even shown 10 times; bid too low and it barely gets seen at all. The right price weighs stock levels, the marketplace's mandatory ad program, and historical performance. Automating it saved the client €52,000/year versus manual management. A repricer module rounds it out: once the mandatory ad program period ends, it resets the price back to what it was beforehand, preserving full net profit instead of letting it leak into marketplace loyalty points.

A classic cross-border resale play: bought in China through Poizon, shipped across the border, margin coming from the price delta between markets. 3 weeks, 3–4 people full-time, to hit the client's launch date — a direct test of front-end skills retained from a 6-month backend internship at OZON. They held up.

Bought broken phones off Avito, repaired them with parts from the radio market, and resold them — 3 units sold before a bad parts order from China ended the venture at a loss. It stopped making sense fast, too, as phones became harder to disassemble and original boards impossible to source.