Who actually hires freelance phonetics / speech & language data specialists at companies?

Hi everyone, I'm currently building a freelance business around phonetics, speech and language data services and I'm trying to better understand who the actual decision-makers are on the client side. I'm thinking of services such as: phonetic/IPA transcription and annotation speech data annotation and quality control pronunciation analysis phonetic validation of speech datasets linguistic QA potentially other speech/language-data work for ASR, TTS and AI projects When approaching companies directly, which job titles or departments would typically be responsible for hiring or contracting someon