Develop and maintain Python code for data analysis, model evaluation, and the automation of AI workflows.
Design, implement, and evaluate sophisticated prompts for Large Language Models (LLMs) to optimize performance across various conversational tasks.
Integrate and fine-tune Speech-to-Text (STT) and Text-to-Speech (TTS) models to ensure high-quality, natural-sounding voice interactions.
Implement and improve methods to quantitatively and qualitatively compare and evaluate LLM outputs.
Collaborate with Data Scientists and Engineers to identify technical requirements, prioritize tasks, and architect scalable AI solutions.
Create and curate multilingual speech and text datasets to train and benchmark models.
Evaluate, recommend, and implement machine learning models for tasks such as topic modeling, summarization, and intent classification.
Develop data visualization tools and dashboards to monitor model performance and provide insights to stakeholders.

Master’s degree in Human-Computer Interaction, Computer Science, Cognitive Science, Linguistics, or a similar technical field.
Proven experience in Python programming for data science, machine learning, or software development.
Solid understanding of Conversational AI concepts and the underlying technologies.
Strong attention to detail and a commitment to maintaining high-quality standards in code and model performance.
Demonstrated ability to work independently and as part of a collaborative, customer-facing team.
Excellent technical communication skills.
Fluent in English, both written and spoken.
Graduate degree or higher in Computer Science or related field (preferred).
Fluency in Spanish and/or Portuguese (preferred).
Deep hands-on experience with LLMs, including prompt engineering, fine-tuning, and evaluation techniques (preferred).
Expertise in Speech-to-Text (STT) and Text-to-Speech (TTS) technologies (preferred).

Health, dental, and vision coverage, beginning on the first day of employment.
Five9 covers 100% of the employee portion of the health, dental and vision coverage and shares a high portion of the dependent cost.
Short & Long-Term Disability, Basic Life Insurance, and a 401k saving plan with employer matching.
Access to an innovative mental health support platform.
Generous employee stock purchase plan.
Paid Time Off, Company paid holidays, paid volunteer hours and 12 weeks paid parental leave.

Data Scientist – AI Trainer

Key skills