Zalando has reported a 29.5% increase in sales to €1.04bn (£828m) for the six months to June 30.
Ebit for the period also improved, up to 1.2% for the first half, compared to an 8.9% dip for the first six months of 2013.
The business reported “significant margin improvement” driven by cost of sales, fulfilment and successful marketing.
Rubin Ritter, director at Zalando said: “Achieving a positive group EBIT margin in the first half-year is a major success for Zalando. Historically, our performance in the first half of any financial year tended to be weaker than in the second half.”
The Zalando mobile app has now been rolled out to all international markets, resulting in 3.8 million app downloads by the end of the second quarter.
Active customers for the etailer grew to 13.7 million at the end of the six months, compared to 11.6 million at the end of the first half 2013.