The AIM-listed company expects the number of restaurants using the platform in the city “will increase quickly” and for Brighton to be a “significant location” for the company.
BigDish’s platform enables restaurants to offer discounts to potential diners during quieter periods via its website and app.
Chief executive Sanj Naha said: “The addition of Brighton to the BigDish platform is incredibly exciting.
“We expect the location to be a major hub of BigDish activity and are looking forward to seeing more and more restaurants added.”
He also hailed progress with the company's recruitment drive, with a territory manager covering the south east of the UK due to start on 5 August and other appointments planned to cover the rest of the country.
Bigdish shares rose 3% to 6.23p in early trading on Thursday.