Open to opportunities

Vitor Plentz

@vitorplentz

Message

I build production LLM systems with guardrails, scalable data platforms, and reliable AI agents.

Brazil

Message

What I'm looking for

I'm looking for remote LATAM or global AI engineering roles where I can build and operate reliable production LLM systems, AI agents, scalable backend platforms, and the guardrails that make AI products dependable.

At Aliança, I run a multi-tenant LLM messaging system serving 450+ users across 12 tenants, backed by a 44.5M-row PostgreSQL platform. I helped take the product from zero to paying clients in 18 months as the sole engineer behind roughly 93k lines of Python/FastAPI.

I build the production layer around AI systems: spend budgets, rate limits, prompt-injection defense, structured output validation, LLM-as-judge evaluation, provider failover, and graceful degradation. I'm also building a multilingual text-to-SQL agent using schema-RAG, tenant scoping, SQL AST guards, and an evaluation harness.

Previously, I modernized telecom messaging platforms, built VoIP testing infrastructure, delivered ISP network automation, and maintained enterprise cooperative systems across PHP, Symfony, COBOL, RabbitMQ, and Docker.

Experience

Work history, roles, and key accomplishments

Current

Founding AI Engineer

Current

Aliança

Nov 2023 - Present (2 years 9 months)

Operate a multi-tenant LLM messaging system for 450+ users across 12 tenants, with a 3-step routing cascade and tested failover. Engineer production guardrails including spend budgets, rate limits, and prompt-injection defense.

Python fastAPI OpenAI Anthropic GROQ PostgreSQL Redis Docker CI CD RAG AI Agents LLM As Judge Prompt Engineering SQLAlchemy Alembic Asyncpg

Software Engineer

Brasilfone Telecom

Jul 2023 - Apr 2024 (9 months)

Refactored legacy PHP/Symfony voice and mass-messaging platforms into multi-tenant whitelabel solutions. Built end-to-end VoIP test infrastructure with Docker Asterisk PBX and Kamailio SIP.

PHP Symfony Docker Asterisk Kamailio VoIP

Software Engineer

IXC Soft

Feb 2022 - Jul 2023 (1 year 5 months)

Built ISP-management features and SSH network-automation tooling, replacing manual operator work. Introduced RabbitMQ async processing and automated quality gates.

PHP RabbitMQ PHPStan SonarQube Graylog SSH Network Automation