About

Photo of Leonardo Castro

Technology is more than my profession. It is one of my greatest passions. ❤️

My journey is driven by curiosity, a constant desire to learn and the conviction that technology, when well applied, has the power to transform businesses, connect people and build a better future.

I am a specialist in Artificial Intelligence, Machine Learning, Solution Architecture and Software Engineering, with more than two decades of experience in technology, spanning different generations of systems, architectures and digital transformations.

🧠 Artificial Intelligence, Engineering and Innovation

My work combines technical depth with strategic vision. I have experience building solutions based on Generative AI, Large Language Models (LLMs), intelligent agents, RAG architectures, Machine Learning, MLOps and distributed systems.

I like to understand technology at its core: exploring architectures, investigating models, writing code, experimenting with new approaches and turning complex ideas into real, scalable and sustainable solutions.

From architectural design to production deployment, I believe in engineering grounded in best practices, security, observability, performance and continuous evolution.

👥 Leadership is about technology, but above all about people.

Throughout my career, I have led multidisciplinary teams, taken part in strategic decisions and driven projects from their first hypotheses all the way to stable production environments.

I believe in close, technical and human leadership — one that develops talent, encourages autonomy, shares knowledge and builds environments where people can grow and do extraordinary work.

For me, the best results come when technical excellence, collaboration and purpose go hand in hand.

💡 An engineer’s mindset. A vision for the future.

My professional foundation was built long before Artificial Intelligence became mainstream. I have worked across infrastructure, networking, operating systems, databases, software development, distributed architectures and cloud computing.

This diversity gives me an integrated view of technology, allowing me to understand not only models and algorithms, but all the engineering needed to turn innovation into reliable products and concrete results.

I am still that enthusiast who loves to experiment, take concepts apart, study new technologies and find out how things work. The curiosity that brought me here is still what drives me forward.

✈️ Between code, algorithms and clouds.

Beyond engineering, I am an airplane pilot and passionate about aviation.

Flying has taught me lessons I carry into my professional life: discipline, planning, situational awareness, responsibility and the importance of making good decisions, especially in complex scenarios.

In aviation, just as in engineering, knowledge, precision and teamwork make all the difference.

In the end, I believe technology and aviation share something essential: both turn knowledge into possibilities and challenge us to go further and further.

🚀 I am still driven by the same passion that got me started: learning, building, sharing knowledge and exploring new horizons.

Email: leonardobbh@gmail.com

Phone:+55 31 99131-7123

City: Belo Horizonte - MG

Country: Brazil 🇧🇷

Languages: Portuguese (native), English (professional)

Interests

  • AI Agents & Multi-Agent Systems

  • LLMs & Generative AI

  • Edge AI

  • Responsible & Ethical AI

  • Research & Papers

  • Open Source

  • Robotics

  • Quantum Computing

Education

Postgraduate in AI & ML

February 2026 – June 2027 (in progress)

PUC Minas

  • Graduate Specialization (Lato Sensu)
  • Artificial Intelligence
  • Machine Learning

Software Engineering

July 2013

Impacta

  • Programming and Data Structures
  • Systems Engineering and Analysis
  • Software Architecture and Design Patterns
  • Databases and Information Systems
  • DevOps, Testing and Version Control

Computer Networks

July 2013

Pitágoras

  • Reference Models (OSI and TCP/IP)
  • IP Addressing and Subnetting (IPv4/IPv6)
  • Communication and Security Protocols
  • Switching and Routing
  • Network Monitoring and Troubleshooting

Certifications

Certification logo TensorFlow Developer - Coursera

TensorFlow Developer

2022

Coursera

  • Neural Networks with TensorFlow and Keras
  • Preprocessing with TensorFlow
  • Computer Vision | CNNs
Certification logo Google Cloud Solution - Google

Google Cloud Solution

2022

Google

  • Cloud Architecture on GCP
  • Infrastructure Management
  • Security and Compliance
Certification logo AWS Solutions Architect - AWS

AWS Solutions Architect

2021

AWS

  • Cloud Architecture Design
  • High Availability Architectures
  • Performance and Cost Optimization
Certification logo Machine Learning Engineer - Nanodegree — Udacity

Machine Learning Engineer

2017

Nanodegree — Udacity

  • Predictive Modeling
  • Feature Engineering
  • MLOps
Certification logo Deep Learning Specialization - Deeplearning.ai

Deep Learning Specialization

2017

Deeplearning.ai

  • Deep Neural Networks
  • Convolutional Neural Networks (CNNs)
  • Sequence Models and NLP
Certification logo LPIC 2 - Linux Engineer - Linux Professional Institute

LPIC 2 - Linux Engineer

2016

Linux Professional Institute

  • Kernel | Advanced Networking and Services
  • Storage Management
  • Security and Authentication
Certification logo PCI DSS - Payment Card Industry Data Security Standard

PCI DSS

2017

Payment Card Industry Data Security Standard

  • Security Controls Implementation
  • Risk and Vulnerability Management
  • Application and Systems Security

Experience

V8.TECH

May 2025 – August 2026

AI Architect | Tech Lead | AI & Machine Learning Specialist

  • Tech Lead, AI Architect and specialist in Artificial Intelligence, Machine Learning, Data Science and Software Engineering, leading high-complexity initiatives from discovery and architecture definition through deployment and production operations.
  • Design of AI and software architectures: solutions with LLMs, intelligent agents, RAG, embeddings, vector databases, microservices, APIs, messaging, asynchronous processing, data pipelines, observability, security, governance and scalability.
  • Technical leadership: defining standards, architecture reviews, mentoring, code review and growing multidisciplinary teams, fostering autonomy, technical quality and continuous improvement.
  • Distributed systems, microservices, APIs and cross-platform integration.
  • Observability, governance, security and cost control, with architecture decisions driven by scalability, performance and business goals.
  • Taking solutions from POC to production.

Kunumi

August 2020 – February 2025

Tech Lead | AI & Machine Learning Specialist | Senior Software Engineer

  • Tech Lead of technical teams on Artificial Intelligence and Machine Learning projects for clients. Responsibilities included technical architecture, data engineering and data science, software development and machine learning models.
  • Featured projects — Health insurer: ETL development, building and deploying classification, clustering and decision tree models on AWS infrastructure using containerization and resource optimization. Stack: AWS, PostgreSQL, APIs, Apache Spark, Pandas, Sklearn, Keras, PyTorch.
  • Logistics operator: Led the integration of AI models with the CRM system. Stack: PostgreSQL, statsmodels, Python Flask, Docker, React.js.
  • Multinational consumer goods company: Data engineering and data science, including ETL processes built specifically for artificial intelligence models. Stack: MLflow, Airflow.
  • National retail chain: End-to-end implementation of a conversational assistant using advanced models. Stack: Rasa, NLU, BERT, spaCy, RabbitMQ, Apache Kafka, MongoDB, Python, Node JS, React JS.
  • Pulp and packaging manufacturer: Predictive models with data engineering and data science on the Microsoft Azure platform. Stack: Azure Analytics Services.
  • Power utility company: Built and deployed anomaly detection models. Stack: Google Cloud, PyOD, Flask, React JS.
  • Manufacturing company: Data engineering and predictive models integrated into a complete analytics platform. Stack: Google Cloud, Kubernetes, Docker, LightGBM, XGBoost, Pandas, Dask, Apache Spark, Fullstack Node JS, React JS.
  • Development of LLM-based (Large Language Model) intelligent agents for task automation and conversational interaction.
  • Advanced models: LLM for candidate screening.

Nubefy Tecnologia

August 2020 – December 2024

CEO

VelAir - Civil Aviation School

September 2018 – April 2024

Fullstack Developer

  • Fullstack development of management systems for a civil aviation school
  • Mobile flight monitor built with Flutter
  • SQL scripts and test case scenarios
  • Web and mobile UI development (Android and iOS)
  • Technologies: Next JS, React JS, Express JS, MongoDB, AWS EC2, AWS RDS, PHP, Laravel, Tailwind, Bootstrap, jQuery, Material Design, MySQL, PostgreSQL.

TrackerUp

October 2019 – February 2020

Infrastructure Architect, Dev Lead - Node JS | PHP

  • Tested, designed and developed backend APIs for a WebRTC-enabled multi-party video conferencing web application, delivering the project 15 days ahead of schedule through an efficiently designed project flow.
  • Architecture, planning and deployment of on-premise and cloud infrastructure for the Tracker Up system.
  • GNU/Linux infrastructure management (Debian - Ubuntu - CentOS - Proxmox - AWS).
  • Development and maintenance of internal systems and jobs in PHP, Python and Shell Script.

Capgemini

July 2019 – October 2019

DevOps and Senior Developer Java | Python | PHP

  • Development and maintenance of PHP systems for the SEI platform (Electronic Information System) for TJMG (Minas Gerais Court of Justice).
  • Architecture and development of the DevOps environment for Capgemini BH.

Sicoob

May 2016 – August 2019

Software Architect / Engineer

  • Architecture and design of computer network and datacenter infrastructure.
  • Led infrastructure projects: email services and ERP and CRM system rollouts.
  • Development of credit engines for individuals and businesses using Machine Learning techniques.
  • Implementation of supervised classification models, with emphasis on decision trees and Random Forest.
  • Focused on risk analysis, automation and decision support for credit approval.
  • AI model technologies: Scikit-learn, XGBoost, LightGBM, Pandas, Jupyter Notebook, NumPy and Matplotlib / Seaborn
  • Infrastructure technologies: Proxmox, DBA, Nginx, Apache, MySQL, PHP, Shell Script, Python, Infrastructure, VPN, Storage Server, HAProxy, OpenSSL, DNS, DHCP, Samba, LVM Storage, Digital Certificates, Firewall, Information Security, Load Balancing.

Stratus TI

June 2017 – March 2019

Systems Analyst | Software Engineer | DBA

  • Stratuscard System: development of applications and processing for Private Label payment methods (credit cards) for credit unions (Sicoob) and trade unions in Minas Gerais — infrastructure, modeling and multi-platform system development (Desktop, Web, Android, iOS) and payment APIs following PCI-DSS rules and procedures.
  • Business Intelligence: reporting, online analytical processing, data and text mining, complex event processing, business performance management, benchmarking, predictive and prescriptive analytics.
  • Technologies: MySQL, Oracle PL/SQL, MongoDB, Redis, PHP, Java, Python, HTML5, CSS, JavaScript, jQuery, AngularJS, Bootstrap, Material Design, Ionic, Cordova, Shell Script, Microsoft Power BI, Microcontrollers (C/C++), Linux, FreeBSD, Windows Server, Docker, HAProxy, GlusterFS, Nginx, Apache, ZFS, AWS Cloud, Google Cloud.

HCS Computadores

2006 – 2010

Infrastructure Specialist

  • Systems development, projects and computer network administration for companies in the mining, steel and environmental sectors.
  • Vallourec Mannesmann: TOTVS systems and infrastructure rollout.
  • Carpathian Gold: design and deployment of network infrastructure, structured cabling, Windows Server servers, firewalls and interconnection between Quebec (Canada), Romania, Belo Horizonte and Riacho dos Machados.
  • Rocha Alves Equipamentos Topográficos: computer network deployment, Windows Server servers and user support.
  • Technologies: Cisco, VPN, Windows Server, Active Directory, ISA Server, Exchange Server, Red Hat Linux, Shell Script, Structured Cabling, Fiber Optics, Data Center.

MMNet

2005 – 2006

IT Technician

  • Outsourced services for Magnesita S/A: support and maintenance of desktops, notebooks, printers and monitors.

Escola Estadual Maestro Villa-Lobos

2001 – 2005

Analyst

  • School management systems development, data analysis, computer maintenance, projects and computer network administration.
  • Technologies: Clipper, xBase, FoxPro, Delphi 7, Interbase, Quick Reports, Rave Reports, Conectiva Linux, SSH, Windows Server 2000/2003, Active Directory, Structured Cabling, Firewall, FTP Server.

Case Studies

Generative AI

AI agent platform with RAG

Challenge
Automate tasks and interactions that depended on internal knowledge scattered across documents and systems.
Solution
LLM-based agents with RAG, embeddings and a vector database, exposed through microservices and asynchronous processing.
Outcome
From POC to production, with observability, governance and cost control from day one.
  • LLMs
  • RAG
  • Embeddings
  • Vector Databases
  • Microservices
  • Messaging

Healthcare

Predictive models for a health insurer

Challenge
Turn large volumes of healthcare data into model-driven decisions.
Solution
ETL pipelines and classification, clustering and decision tree models in the cloud, with containerization and resource optimization.
Outcome
Models deployed to production on scalable, cost-optimized infrastructure.
  • AWS
  • PostgreSQL
  • Apache Spark
  • Scikit-learn
  • PyTorch
  • Docker

Retail

End-to-end conversational assistant

Challenge
Scale customer service for a retail chain with consistent answers across multiple channels.
Solution
Assistant built on NLU and language models, integrated with internal systems through queues and streaming, with a web front end.
Outcome
Complete implementation, from language understanding to integration with business systems.
  • Rasa
  • BERT
  • spaCy
  • Kafka
  • RabbitMQ
  • MongoDB
  • React

Energy

Anomaly detection in the power sector

Challenge
Spot abnormal behavior in operational data before it turned into problems.
Solution
Unsupervised anomaly detection models served via API, with a web dashboard for analysis.
Outcome
Models built and deployed, supporting operational monitoring.
  • Google Cloud
  • PyOD
  • Flask
  • React

Manufacturing

Industrial predictive analytics platform

Challenge
Unify production and business data to anticipate demand and support planning.
Solution
Distributed data engineering and gradient boosting models integrated into a fullstack analytics platform.
Outcome
Complete platform on Kubernetes, with predictive models built into the decision flow.
  • Google Cloud
  • Kubernetes
  • LightGBM
  • XGBoost
  • Apache Spark
  • Dask

Logistics

AI integrated into the CRM

Challenge
Bring model predictions into the day-to-day work of sales teams.
Solution
Statistical models exposed via API and integrated into the CRM, with a web interface and containerized deployment.
Outcome
Predictions available directly in the system the team already uses, with no manual steps.
  • PostgreSQL
  • Statsmodels
  • Flask
  • Docker
  • React

Skills

Generative AI & LLMs

  • LLMs
  • RAG
  • Embeddings
  • LangChain
  • LangGraph
  • LlamaIndex
  • OpenAI
  • Anthropic
  • Hugging Face
  • Prompt Engineering

Also worked with

vLLM · Ollama · Rasa · T5X / Flax

AI Agents

  • Hermes AI
  • OpenClaw
  • NemoClaw
  • Multi-Agent Systems
  • Agent Orchestration
  • Tool Calling
  • MCP
  • A2A
  • Agent Memory
  • Planning & Reflection
  • ReAct
  • Context Engineering
  • Human-in-the-loop

Also worked with

Long-running autonomous agents · Sub-agents · Computer Use agents

Evals & Harness

  • LLM & Agent Evals
  • Harness Engineering
  • Eval Harness
  • LLM-as-a-Judge
  • Evaluation Datasets
  • Prompt Regression Testing
  • Guardrails
  • Red Teaming

Also worked with

Benchmarks · Human Evaluation · Model A/B Testing

Graph Engineering

  • Knowledge Graphs
  • GraphRAG
  • Neo4j
  • Cypher
  • Ontologies
  • Graph Modeling

Also worked with

Graph Algorithms · Entity Resolution

Machine Learning & Data Science

  • PyTorch
  • TensorFlow
  • Scikit-learn
  • XGBoost
  • LightGBM
  • Transformers
  • NLP
  • Computer Vision
  • Anomaly Detection

Also worked with

JAX · Keras · Statsmodels · H2O · spaCy · NLTK · BERT · PyOD · AutoML · Pandas

Data & MLOps

  • Apache Spark
  • Kafka
  • Airflow
  • MLflow
  • Databricks
  • Snowflake
  • ML Pipelines
  • AIOps
  • AgentOps

Also worked with

Dask · Ray · Presto / Trino · Hadoop · SageMaker · Vertex AI · Azure Synapse · Power BI

Architecture & Engineering

  • Solution Architecture
  • Spec-Driven Development
  • Microservices
  • Distributed Systems
  • APIs
  • Messaging
  • Python
  • FastAPI
  • Node.js
  • Go

Also worked with

Java · Spring Boot · Django · Flask · Express · Fastify · PHP · Laravel · Ruby on Rails · C / C++ · C# · React · Next.js · Vue · Svelte · Tailwind

Cloud & DevOps

  • AWS
  • Google Cloud
  • Azure
  • Docker
  • Kubernetes
  • Terraform
  • GitHub Actions
  • GitLab CI

Also worked with

Oracle Cloud · Linux · Proxmox · Nginx · HAProxy · RabbitMQ · Windows Server

Observability

  • Prometheus
  • Grafana
  • OpenTelemetry
  • Logs / Metrics / Traces
  • LLM & Agent Tracing
  • AI Cost Monitoring
  • Model Monitoring (Drift)
  • SLOs & Alerting

Security

  • AI / LLM Security
  • OWASP Top 10 for LLMs
  • Prompt Injection
  • AppSec / OWASP
  • DevSecOps
  • IAM
  • Secrets Management
  • Zero Trust
  • LGPD
  • PCI-DSS

Also worked with

Networking / VPN / Firewall · Digital Certificates · Information Security

IoT & Edge

  • MQTT
  • ESP32
  • Arduino
  • Raspberry Pi
  • Edge AI
  • AWS IoT Core
  • Azure IoT Hub
  • Device Telemetry

Also worked with

Microcontrollers (C / C++) · Time Series

Databases

  • PostgreSQL
  • pgvector
  • Qdrant
  • Pinecone
  • Weaviate
  • MongoDB
  • Redis

Also worked with

MySQL / MariaDB · SQL Server · Oracle · DynamoDB · Cassandra · Firestore · Bigtable · InfluxDB · TimescaleDB