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[Job - 30085] Senior Data Scientist (LLM), Brazil

3 days, 13 hours ago
Brazil
Full-time
Senior
AI Engineer
Data Science and Analytics
AWS Azure GCP Generative AI LLM Machine Learning NLP NumPy Pandas Python Scikit-learn
Apply Now
CI&T

CI&T

CI&T is a global digital technology agency empowering agile growth for leading companies through advanced technologies with a team of 2000 experts worldwide.

Internet Software & Services
5K-10K
Founded 1995
View All Jobs 116

Description

  • Curate specialized datasets to evaluate conversational agents using LLM-as-judge and generative AI evaluation frameworks.
  • Monitor and optimize conversational quality metrics such as First Contact Resolution (FCR), fallback rates, and answer accuracy.
  • Run A/B tests on prompts and language models to continuously improve the conversational experience.
  • Optimize voice pipelines, including Speech-to-Text and Text-to-Speech, for telecom-specific accents and terminology.
  • Tune transcription and synthesis models to reduce latency and improve interaction naturalness.
  • Define and implement conversational security policies in guardrails to ensure auditability, ethics, and alignment with business rules.
  • Collaborate with governance teams to maintain compliance with regulations and responsible AI practices.
  • Develop advanced prompt engineering strategies to improve response precision and consistency.
  • Perform model fine-tuning when needed to address domain-specific and customer service requirements.
  • Work closely with developers, data engineers, and architects to align the intelligence layer with the overall technical solution architecture.
  • Communicate technical findings and recommendations clearly to business stakeholders and client leadership.

Requirements

  • Strong experience as a Data Scientist.
  • Proven experience with large language models (LLMs) and natural language processing (NLP).
  • Hands-on experience with generative AI model evaluation frameworks such as RAG, G-Eval, or equivalent approaches.
  • Advanced proficiency in Python, including Pandas, NumPy, and Scikit-learn.
  • Strong foundation in statistics and probability applied to machine learning problems.
  • Practical experience with cloud platforms such as AWS, GCP, Azure, or Oracle Cloud Infrastructure (OCI).
  • Ability to translate business requirements into measurable and auditable technical solutions.
  • Experience with Oracle Cloud Infrastructure (OCI) and its generative AI services is preferred.
  • Practical knowledge of Speech-to-Text and Text-to-Speech pipelines, especially with Whisper or equivalent technologies, is preferred.
  • Experience fine-tuning language models such as Llama, Cohere, GPT, or similar models is preferred.
  • Familiarity with NeMo Guardrails or equivalent conversational security frameworks is preferred.
  • Previous experience in voice, contact center, or automated customer service projects is preferred.
  • Experience in the telecom sector or other high-volume customer interaction industries is preferred.

Benefits

  • Health and dental insurance.
  • Food and meal allowances.
  • Childcare assistance.
  • Extended parental leave.
  • Gym and wellness partnerships through Wellhub (Gympass) and TotalPass.
  • Profit sharing bonus (PLR).
  • Life insurance.
  • Continuous learning platform (CI&T University).
  • Discount club and partnerships with online course platforms.
  • Free online platform focused on physical, mental, and overall well-being.
  • Pregnancy and responsible parenting course.
  • Language learning platform.

Interested in this position?

Apply directly on the company website

Apply Now

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