It seems you are asking, “Who composed 3.5 crore (35 million) shlokas?” In authentic Jain literature, there is no accepted Jain Acharya or scripture known to contain or compose “3.5 crore shlokas.”

What our traditions state:

• Shvetambar tradition: The largest canonical work was Dṛṣṭivāda (containing the 14 Purvas), taught by Bhagavan Mahavira and preserved by his Gaṇadharas. These texts were extraordinarily vast but are now lost. No reliable source gives them as “3.5 crore shlokas,” nor are they credited to a single human author.
• Digambar tradition: The earliest preserved scriptures are Śaṭkhaṇḍāgama (by Ācārya Puṣpadanta and Bhūtabali) and Kaṣāyapāhuḍa (by Ācārya Guṇadhara). These are extensive, but nowhere near “3.5 crore shlokas,” and such a number is not claimed.

Therefore, “3.5 crore shloka” is not an authentic, standard figure in Jain Dharma for any one author or text.