Backend Engineering & AI Systems

Gabriel Penha

Backend Engineer | Python, FastAPI, Async APIs

RAG Pipelines & AI Agents | Remote

Brazil (Remote) · Open to EU relocation · Available immediately

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About

I started in systems programming, building event-driven architectures and optimizing memory under hard constraints. That foundation in low-level performance shaped how I approach every backend system: fast by default, resilient under load, observable in production.

Over 4.5 years I've shipped production backends in Python and FastAPI: high-throughput REST APIs, async data pipelines, and event-driven services that handle real-time telemetry, semantic search, and AI-powered workflows. I'm the author of a published PyPI package and an active open-source contributor to Starlette and LlamaIndex.

My focus today is AI engineering: building RAG pipelines, orchestrating LLM agents, and designing systems where retrieval, synthesis, and tool-use work together under strict latency and reliability constraints.

Experience

Backend Software Engineer ZWIM | Connected Swim Training

Mar 2025 – Jun 2026 · Remote

Built FastAPI-based REST APIs and telemetry pipelines connecting real-time simulation data to Python backend services. Designed and implemented a concurrent processing/entity-simulation system (ECS) for real-time data handling. Containerized application microservices with Docker and optimized complex PostgreSQL queries across high-volume tables to reduce latency and ensure transactional data integrity.

Backend Software Developer GDH Studio

2022 – 2024 · Remote

Developed internal automated processing pipelines and event-driven integrations with third-party microservices, eliminating hours of manual operational overhead per week. Developed modular systems and automation tools, utilizing C++ for tool development and MetaSounds integration alongside Python and other technologies, and conducted performance optimization under strict resource constraints.

Audio Programmer RareBird Games

2024 · Remote

Designed and implemented audio systems and interactive sound behavior using MetaSound and Blueprints, applying SOLID design principles and Clean Code. Conducted performance optimization to ensure high-availability audio playback under hardware constraints.

Projects

Project Aether

Semantic search engine with multi-tier caching

Full-stack RAG engine built on LlamaIndex Workflows. Combines Chroma vector search with a Redis HNSW semantic cache for sub-millisecond repeated-query responses. Event-driven ingestion pipeline with configurable chunking, embedding, and metadata filtering.

FastAPI LlamaIndex Chroma Redis Groq HNSW

CabaModel

AI agent orchestration framework

Agent orchestration system built on Google ADK and Gemini, with a FastAPI backend for multi-agent workflows. Implements tool-use patterns, inter-agent communication, and structured output pipelines for complex AI tasks.

Google ADK Gemini FastAPI Python

OsCabaOrganiza

CLI tool for file automation

Command-line utility for automated file organization and batch processing. Handles directory scanning, rule-based file routing, and batch renaming with configurable templates.

Python CLI Automation

fastapi-neo4j-healthcheck

Published PyPI package

Lightweight health-check middleware for FastAPI applications backed by Neo4j. Provides startup/shutdown lifecycle hooks, connection pool monitoring, and detailed health endpoints for orchestrators and load balancers.

FastAPI Neo4j PyPI Python

Skills

Languages

Python TypeScript GDScript SQL Bash Lua

Backend Frameworks

FastAPI Starlette AdonisJS 6

AI / ML

LlamaIndex LangChain LangGraph RAG Google ADK Groq

Data & Infrastructure

Redis Neo4j Chroma PostgreSQL Docker

Observability

Grafana Prometheus structlog OpenTelemetry

Practices

SOLID CI/CD Event-Driven Clean Code

Certifications & Credentials

Official industry certifications validating AI Agent workflows, Cloud Kubernetes infrastructure, Graph Database modeling, and software engineering competence.

6 Verified Credentials
LangChain Academy Aug 2026
Verify

Foundation: Introduction to LangGraph (Python)

Completion certificate from LangChain Academy's official course on LangGraph, building stateful AI agents, multi-agent orchestrations, and cyclical workflow architectures with precision control.

AWS Aug 2026

AWS Knowledge: Amazon EKS

Verified credential demonstrating practical expertise in designing, deploying, and managing containerized applications on Amazon Elastic Kubernetes Service (Amazon EKS).

Neo4j GraphAcademy Passed 91%
Aug 2026

Neo4j Certified Professional

Official professional certification issued by Neo4j GraphAcademy (Passed with 91%). Validates practical expertise in Graph Databases, Cypher Query Language, and GraphRAG architectures.

AWS Aug 2026

Serverless - Knowledge Badge Readiness Path

Official completion certificate for AWS Serverless Knowledge Badge Readiness Path (including Labs). Hands-on experience in Serverless Architecture, AWS Lambda, and API Gateway.

EF SET Score 80/100 · C2

EF SET English Certificate (C2 Proficient)

Official EF SET English Certificate scoring 80/100 (C2 Proficient / Full Mastery). Demonstrates fluent C2-level technical writing, public presentation, and international communication.

freeCodeCamp Jul 2026

Relational Database Certification

Verified certification covering relational database principles, SQL query optimization, PostgreSQL schema engineering, and Bash scripting automation.

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