It depends a lot in the field you'll be working actually. If all your startup does is data ping-pong from fronted to DB, maybe collaboration software or alike, math has little to none value.

If you are building the next speech recognizer, siri 2.0, social media consumer market analysis, meme detection and tracking, financial planning and prediction, quant. trading, ebay bid e-assistant, consumer-advertiser matching etc, then math has a big influence over the result.