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

3 days, 13 hours ago
Full-time
Senior
Data Science and Analytics
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

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

Similar Roles

Data Scientist

Greenhouse Software 251-1K Professional Services

Greenhouse is hiring a Data Scientist to join its Corporate Development and Analytics team, where the role turns product data into insights and data products that guide executive decision-making and long-term roadmap planning.

GCP Git Python Snowflake SQL
12 hours, 43 minutes ago

Intern, Forward Deployed Engineering

Workato 251-1K IT Services

Workato is hiring a Forward Deployed Engineering intern to support AI-driven automation initiatives by helping build intelligent agents and enterprise workflow integrations on its Agentic AI platform.

JavaScript JSON LLM Python REST API Salesforce
12 hours, 43 minutes ago

Downeast Cider - AI Full Stack Developer

Jobrack 11-50 Professional Services

Downeast Cider is hiring an AI Full Stack Developer to become its first technical employee and build production-ready internal tools that improve operations across the business.

CRM GCP JavaScript NetSuite Python Shopify Snowflake SQL TypeScript
12 hours, 58 minutes ago

Freelance Chatbot Developer (WhatsApp / Telegram / Discord)

Mindrift.ai: Be the “I” in AI Internet Software & Services

Mindrift is hiring a part-time freelance Bot Developer for the Tendem project to build and refine conversational bots and messaging-platform integrations in a hybrid AI and human workflow.

Docker Node.js OAuth Python REST API Serverless
13 hours, 13 minutes ago

You're on a roll! Sign up now to keep applying.

Sign Up

Already have an account? Log in

Used by 14,729+ remote workers