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Lucas
Pacheco

AI / Software Engineer  ·  Rio de Janeiro

Building real AI solutions for real business problems.

❯ type help to explore, or playground to have some fun

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01

About

I build production AI systems that ship — agent loops over ~90 typed tools, Knowledge-Graph RAG, and the benchmarks that grade them.

Focused on LLM systems: tool calling, prompt caching and context management, RAG/GraphRAG, MCP, and agent evaluation. At OceanPact I build conversational agents and a Knowledge-Graph RAG platform; at Turing I design multi-agent benchmarks and the verifiers that grade them. Open-source contributor to cognee. Portuguese (native), English (fluent), Spanish (intermediate).

Location

Rio de Janeiro, Brazil

Education

Computer Engineering @ UFRJ

Status

Open to opportunities

02

Projects

CSN Analytics
01

CSN Analytics

featured

Manufacturing · ML

Steel defect detection and cutting optimization for manufacturing.

PythonPandasML
GraphMan
02

GraphMan

UFRJ · Graph Theory

A Rust graph library that measures itself, plus a browser observatory. Adjacency list, bitset matrix and CSR representations; BFS/DFS, diameter, components and Dijkstra over swappable frontiers, benchmarked on graphs up to 4.8M vertices. Compiled to WebAssembly, with traversals animated on the GPU.

RustWebAssemblyWebGPUNext.js
Debait
03

Debait

UFRJ · AI chatbot

A debate room with an AI referee. Deb scores every argument as it lands with the math visible, flags fallacies by quoting the exact words, and fact-checks on the web when a debater calls @deb. Rooms are event-sourced and streamed live over SSE; the sides fight over a vgpu (WebGPU) pixel grid behind the chat.

Next.jsAI SDKGroqSSERedisvgpu
CV Agent
04

CV Agent

UFRJ · Artificial Intelligence

An AI agent that reviews résumés with progressively loaded skills: role matcher with web search, format checker, 0–100 scorer and an editor that proposes changes as an inline diff. The agent decides which skill to load, and its findings are highlighted directly on the CV.

Next.jsAI SDKGroqAgent skillsvgpu
02.1

Open source

Contributions and proposals to tools I use

cognee

cognee

Contributor · AI memory library

Merged a fix for Unicode handling in the FalkorDB adapter (NFKD + ASCII folding) so non-English text no longer breaks Cypher queries, with 9 unit tests; further PRs and bug reports on node-set scoping in hybrid retrieval and dataset consistency.

ephemeral-context

ephemeral-context

RFC · Claude Code

RFC + TypeScript reference implementation of cache-aware eviction of used context (skills, files, tool results) in agent loops. A/B test: −34% cache reads, −7.2% input cost.

03

Skills

LLM Systems

Tool calling

Prompt caching

Context management

Agent evaluation

MCP

RAG

GraphRAG

OpenAI

Claude API

Claude Agent SDK

Languages

Python

Rust

TypeScript

JavaScript

SQL

C

C++

Java

Frameworks & Tools

FastAPI

Django

React

Next.js

Node.js

WebAssembly

WebGPU

vgpu

LiteLLM

LangChain

LangGraph

Databases

PostgreSQL

pgvector

LanceDB

Qdrant

Neo4j

FalkorDB

Redis

04

Experience

2026 — Present

AI SwarmBench Engineer (Contract)

Turing

Design multi-agent benchmark tasks that evaluate coordination in LLM agent swarms. Write verifiers that automatically grade agent outputs, and audit agent trajectories for correctness and quality.

2026 — Present

AI Developer

OceanPact

Built the conversational AI agent for a geospatial operations platform: agent loop with parallel tool-calling over ~90 typed tools and real-time SSE streaming with resume-after-reload (Python, FastAPI, OpenAI SDK, Postgres). Built a prompt-regression benchmark and logging to measure agent behavior across prompt changes. Built a production Knowledge-Graph RAG platform that ingests PDF/DOCX, extracts entities and relationships via LLMs, and persists them to a knowledge graph + vector store — polyglot persistence (pgvector, Neo4j, Redis), LiteLLM gateway, per-user ACLs (React 19, FastAPI).

2024 — 2025

AI & Automation Python Developer

Mundivox

Built and maintained Python tools automating optical-network monitoring and incident handling, including log parsing and reporting with Pandas. Built a local RAG chatbot giving the support team access to internal documentation and procedures.

2023 — 2024

Software & Automation Researcher

CBPF

Developed sensor-based automation systems and algorithms for real-time data processing at the Brazilian Center for Physics Research.

05

Let's work
together

Open to new opportunities and collaborations.