In French, if you're using après + [verbe], we consider that this action is always going to take place in the past of when you're speaking.
Therefore, you could NEVER say après faire ça the way you say after doing that in English!
Look at these examples:
Ils passeront la serpillière après avoir fait la vaisselle.They will mop the floor after doing the dishes.
Nous sommes allés nous coucher après avoir dit au revoir à Lisa.We went to bed after having said goodbye to Lisa.
Note that to express after + -ing (or after having + past participle) in French, you use the same following structure:
après + infinitive of auxiliary (être or avoir) + past participle
ATTENTION:
Use the same auxiliary as in compound tenses like Le Passé Composé.
When using avoir preceded by an object pronoun (après l'avoir vu/e), you need to agree the past participle with the object referred to by the object pronoun!
See also the more complex cases: Après être allé = After going (auxiliary être)
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Examples and resources
Après avoir quitté la soirée, Éric est rentré chez lui.After having left the party, Éric went back home.
Après avoir fini ma dissertation, je commencerai mes révisions.After finishing my essay, I will start studying for my exam.
Après l'avoir vue, il ne pouvait penser à rien d'autre.After having seen her, he could think of nothing else.