My ambition is to work for a film company that develops computer software when I grow up.

First of all, the word "fim" in the landlord's sentence is misspelled, which should mean "firm" and "company".

This question is about the difference between gerund and infinitive as predicative. Generally speaking, gerund is a predicative, indicating a habitual or regular action or state; The infinitive is used as a predicative to express actions that will happen in the future. The subject of this sentence is ambition, ambition, ambition. . . The action hasn't happened yet, so we should work with infinitives instead of gerunds. My job is to teach you English. "My job is to teach you English." Gerund teaching is used here to indicate that the action of "teaching" has happened and often happens.

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