designing systems
that think with you.

I'm André Castro — an engineering leader based in Rio de Janeiro, building AI frameworks, multi-agent systems, and the cloud-native infrastructure that makes them reliable at scale.

github.com/Decolinow Get in touch

15+ Years: Leading engineering teams and strategy
AI Architecture: Orchestration & multi-agent systems
Cloud-Native: High-scale Kubernetes and GitOps
∞ Shipping: Building infrastructure with intent

Featured Open Source

LARI

Lifecycle for Agent Reasoning & Interaction

A robust framework for building and operating AI agents as reliable application components. Extends Microsoft.Extensions.AI with governed tools, RAG, identity, and observability.

* First open-source functional version scheduled for August 31, 2026.

l4ri.app Decolinow/l4ri

.NET / React / AI Platform

01 — focus

what I'm building

Agent Orchestration01

Intelligence Beyond the Prompt

Architecting modular frameworks (like LARI) designed for complex reasoning, multi-step tool invocation, and persistent memory. Bridging the gap between raw LLMs and deterministic business logic.

Distributed Systems02

Resilience at Financial Scale

Expertise in event-driven microservices, low-latency financial data processing, and high-throughput architectures using technologies like ClickHouse and materialized views.

Platform Engineering03

Developer-Centric Infrastructure

Deep focus on Kubernetes orchestration, GitOps workflows, and automated scaling patterns (KEDA/Karpenter) to create high-performance platforms that engineers actually enjoy using.

Engineering Intelligence04

AI-Native Development Life Cycle

Implementing agentic workflows to automate systemic engineering challenges — from autonomous code reviews and unit test generation to AI-assisted incident investigation and observability.

02 — work

a decade and a half of ships

2026
Executive Director · BTG Pactual
Leading engineering strategy and AI adoption across the organization. Focused on platform modernization, FinOps efficiency, and scaling multi-agent architectures for global financial services.
2023
Director · BTG Pactual
Conceived and spearheaded the development of Nina.AI, a high-scale multi-agent framework featuring intent routing, MCP integration, RAG, and automated engineering workflows.
2021
Associate Director · BTG Pactual
Architected a next-generation fund administration platform. Implemented GitOps-driven CI/CD pipelines and established cloud-native infrastructure standards across engineering teams.
2018
IT Analyst · BTG Pactual
Built and delivered the core platform for Real Estate Investment Trusts. Defined microservices framework standards and improved developer experience through automated platform tooling.
2015
Co-founder & CTO · Agiliza!
Co-founded a restaurant tech startup. Architected a native Android platform with real-time server-side synchronization for kitchen management and guest ordering systems.
2011
Full-Stack Developer · Moki Sistemas
Started as an intern and progressed to Full-Stack Developer. Built real-time enterprise dashboards, mobile applications, and high-throughput APIs for complex retail operations.

03 — stack

tools of the trade

# ai & data

Amazon BedrockClaudeGeminiLangChain / LangGraphMCPRAGClickHousePostgreSQLOpenSearchRedisDatabricksPowerBIAirflow

# cloud & platform

AWSAzureKubernetes / EKSRancherHelmKarpenterKEDAIstioRabbitMQGitOpsAzure DevOpsGitHub EnterprisePrometheusGrafanaJaegerDatadog

# engineering

.NET / C#Node.js / TypeScriptPythonMassTransitSAGACQRSEvent-drivenDDDOpenTelemetry

04 — signals

open source & experiments

GitHub

Code, drafts and experiments — in the open.

Agents, platform architecture patterns, and the occasional side quest.

@Decolinow→

Philosophy

"Great AI systems aren't demos — they're infrastructure. Boring on the surface, magical underneath."

05 — contact

let's connect

Expanding the boundaries of AI and Systems Engineering?

Interested in LLM orchestration, high-availability architectures, or strategic partnerships. If you're leading complex technical initiatives or seeking specialized AI advisory, feel free to reach out.

linkedin.com/in/andrebcastro

→

Location

Rio de Janeiro, Brazil