Machine Learning Engineer Specialist

Building production-grade ML and Generative AI systems that deliver measurable business impact.

Specialist AI & Machine Learning Engineer at Marlabs, building large-scale ML and GenAI for US healthcare Revenue Cycle Management. 4x Google Cloud Certified and 2x AWS Certified, specialized in Python, MLOps & LLMOps, RAG, and multi-agent architectures across AWS, GCP, and Azure.

  • Brazil
  • Open to Data Scientist, ML Engineer, Python Developer, and Software Engineer roles
Luis Henrique Miranda Queiroz

4x

Google Cloud Certifications

2x

AWS Certifications

30

Professional Certifications Earned

Top 5,000

AWS GenAI Developer Professional Early Adopter

About

Engineer profile

I am Luis Henrique Miranda Queiroz, a Machine Learning Engineer Specialist at Marlabs, holding a Bachelor's degree in Computer Science from the Federal University of Piaui (UFPI), completed in December 2025.

My work is focused on AI systems that move from prototype to production with reliability, governance, and business value. I combine ML engineering, MLOps, and cloud architecture to deliver robust solutions in real-world environments.

Alongside industry work, I contribute to applied AI research. I took part in "Quality Interfaces for Data Science in Health" with CEREIA, FAPESP, UFC, and Grupo Hapvida NotreDame Intermedica, applying NLP to turn clinical trial reports into structured interoperability documents, and to a CNPq-funded project with the Government of Piaui on NLP for police report analysis.

Key capabilities

  • End-to-end ML lifecycle: data, training, deployment, monitoring, and retraining
  • Generative AI applications with RAG, hybrid search, and multi-agent orchestration
  • Production-grade cloud implementations on AWS, GCP, and Azure
  • Applied NLP for enterprise, healthcare, and public-sector use cases
  • Technical leadership: architecture decisions and mentoring across delivery teams

Impact

Selected outcomes

AWS Resume-to-Job Matching System

Architected and implemented an intelligent matching platform using RAG, Pinecone-based hybrid search, metadata filters, and cross-encoder reranking.

Result: Faster screening cycles, improved recommendation quality, and direct contribution to roughly 50% revenue growth.

MLOps Pipeline for Oncology Risk Prediction

Designed a complete SageMaker pipeline with RDS ingestion, LightGBM training, versioning, GenAI explainability, and real-time endpoints.

Result: Robust production governance with drift detection and automated retraining triggers.

AI Agent with Bedrock AgentCore + MCP

Built an intelligent candidate-support agent with contextual responses, scalable architecture, and full observability via Langfuse.

Result: Seamless internal integration and support for hundreds of concurrent users.

RAG Knowledge Platform for Grupo Santander

Provided technical leadership for a GenAI solution enabling intelligent queries over internal API documentation, technical flows, and business processes, on a secure and scalable Azure architecture.

Result: Significant operational efficiency gains and Top 3 recognition in an international innovation challenge.

Public Security Multimodal Chatbot

Co-developed an LLM-powered multimodal chatbot for police incident reporting, integrated with WhatsApp and cloud infrastructure.

Result: 92.9% usefulness acceptance and ~4s average response time in user testing; evolved into BO Facil, the first WhatsApp-based police report service in Brazil.

Experience

Professional journey

Mar 2026 - Present

Machine Learning Engineer Specialist | Marlabs

Responsible for the architectural design, technical leadership, and implementation of Machine Learning and GenAI solutions in the healthcare domain, working directly with PracticeTek as technical reference for the initiative. The project focuses on Revenue Cycle Management (RCM), reducing claim rejections and denials through predictive modeling and intelligent automation, directly impacting financial efficiency and operational performance.

  • Designed and implemented Machine Learning models for predicting claim rejections and denials, enabling proactive intervention and significantly improving claim acceptance rates and revenue recovery.
  • Led the development of GenAI-driven solutions using LLMs to generate deterministic rules for error prevention, combining statistical learning with rule-based systems to increase explainability and reliability in production.
  • Architected and deployed the end-to-end solution on AWS (SageMaker and Bedrock) and Snowflake, ensuring scalability, performance, and seamless integration with healthcare data pipelines, with full observability through Datadog.
Jun 2025 - Mar 2026

Data Scientist | SOUTH SYSTEM

Responsible for architectural design, technical decision-making, and implementation of ML and GenAI solutions for the internal job portal and enterprise clients, leading initiatives that connected technical innovation to direct business outcomes.

  • Architected an intelligent resume-to-job matching system on AWS with RAG, Pinecone hybrid search, metadata filtering, and Cross-Encoder reranking, contributing to roughly 50% revenue growth.
  • Built a complete MLOps pipeline on SageMaker for oncology symptom-criticality prediction, with drift detection and automated retraining triggers.
  • Developed an AI agent using Bedrock AgentCore with MCP integration via AgentCore Gateway, scaling to hundreds of concurrent users with Langfuse observability.
  • Led a RAG-based GenAI solution for Grupo Santander on Azure, recognized as a Top 3 solution in an international innovation challenge.
Sep 2024 - Jun 2025

Machine Learning Engineer | SantoDigital

Developed AI and MLOps solutions on Google Cloud Platform for internal products and enterprise clients.

  • Built a clustering solution on Vertex AI with automated preprocessing and Markov Chain analysis integrated with BigQuery, surfaced through a Streamlit dashboard on Cloud Run.
  • Led core architectural enhancements to an internal multi-agent product, expanding agent capabilities and scalability.
  • Delivered a multi-agent system for an automotive financing client using MCP servers for context-aware customer service workflows.
  • Fine-tuned models on Vertex AI with RLHF to align response tone and style to different business contexts.
Jan 2024 - Sep 2024

Machine Learning Engineer Intern | SantoDigital

Built CI/CD retraining pipelines and GenAI chatbots with RAG and function-calling patterns on GCP.

  • Replaced traditional NLP methods with multimodal text and image embeddings, improving accuracy and efficiency.
  • Designed automated MLOps pipelines with CI/CD, streamlining retraining of business-critical models.
  • Created a FastAPI and GenAI application for automatic product description generation, reducing operational costs and increasing sales volume.
Sep 2024 - Sep 2025

Scientific Researcher | CNPq / SSP-PI Project

Developed Generative AI and NLP solutions to optimize management of Public Security Secretariat data, including intelligent conversational agents for automated 190 emergency service attendance.

Education

Academic background

Sep 2026 - Mar 2027

MLOps & LLMOps Specialization | Duke University

Advanced specialization covering DevOps and DataOps for ML, pipelines, model deployment, MLflow, Hugging Face, cloud ML platforms, and LLM fine-tuning and deployment in production systems.

Feb 2022 - Dec 2025

BSc Computer Science | Federal University of Piaui (UFPI)

Research activity in the CEREIA project on quality interfaces for health data science, NLP research with the Public Security Secretariat, and scholarship monitor for Digital Circuits.

Credentials

Certifications and recognition

Publications and awards

  • Paper published at ENUCOMPI 2025: Multimodal Chatbot with LLMs for Incident Reporting in Public Security Services
  • 1st place at SIUFPI 2025 with applied research in public security AI
  • Top 3 solution in an international innovation challenge (Grupo Santander GenAI platform)
  • Among the first 5,000 professionals worldwide to earn the AWS Certified Generative AI Developer - Professional
  • Bronze Medal - Brazilian Physics Olympiad (3rd Stage)

Projects

Selected portfolio repositories

Rossmann sales forecasting

Rossmann Sales Forecasting

Regression pipeline for 6-week sales prediction supporting investment planning.

View repository
Customer churn prediction

TopBank Churn Prediction

Classification solution to optimize retention strategies and maximize ROI.

View repository
Sarcasm detection in headlines

Sarcasm Detection in News Headlines

NLP and deep learning solution with Streamlit interface for practical inference.

View repository
Customer segmentation

VIP Customer Segmentation

Clustering and RFM-based segmentation for e-commerce marketing prioritization.

View repository
Book recommendation system

Book Recommendation System

Recommendation engine based on user behavior and cosine similarity.

View repository
Paris housing pipeline

Paris Housing ML Pipeline

End-to-end ML pipeline with CI/CD and cloud deployment on GCP.

View repository

Technical Stack

Core tools and technologies

Languages and frameworks

Python, Golang, SQL, FastAPI, PyTorch, TensorFlow, Scikit-Learn, LangChain, LangGraph, spaCy, NLTK, Hugging Face, Streamlit.

Cloud and MLOps

AWS (Bedrock, SageMaker, Lambda, RDS), GCP (Vertex AI, BigQuery, Pub/Sub, Cloud Run), Azure, Snowflake, Docker, Kubernetes, MLflow, Terraform.

Data and observability

Pinecone, FAISS, Elasticsearch, PostgreSQL, BigQuery, LangSmith, Langfuse, Arize Phoenix, Datadog, GitHub Actions, Bitbucket Pipelines.

AI and NLP

LLMs, RAG, MCP, Multi-Agent Systems, Hybrid Search, Transformers, Cross-Encoders, RLHF fine-tuning, Generative AI.

Recommendation

What colleagues say

I proposed a challenge I was almost certain he could not deliver, and he exceeded every expectation. It was a data streaming demand where he needed to put a Machine Learning model into production within a few days. He handled complex work that would normally fall to a data engineer, and still executed the entire MLOps implementation flawlessly.

He is a professional who is not intimidated by complex challenges or tight deadlines. He delivers consistent results, has an extremely short learning curve, communicates very well, and is well liked by the team.

Fabio Pinheiro, Head of Data, Analytics and AI - direct manager at SOUTH SYSTEM

Contact

Let's build AI systems with real-world value