Seigal's career began when he left Oxford University in 2012 to take part in the prestigious tech startup incubator Y Combinator in Silicon Valley with his first company, the crowd fundraising site Prizeo. Seigal then went on to co-found several other successful startups including Represent.com (an online merchandise platform, sold to CustomInk for $100M), and the women's direct-to-consumer accessories brand Pop & Suki.