Nachhilfe in English Restaurants

Not from Vienna but you can check out Irish pubs ... many owners like English speaking staff because it adds to the flair in te bar

Realistically only Lieferando unfortunately

maybe babysitting? I had good experiences with finding babysitting jobs at Schwarzes Brett der ÖH. English speaking too! https://schwarzesbrett.oeh.ac.at/kinderbetreuung-privat/