Voice and chat agents
Live conversational pipelines: audio over LiveKit, Gemini Multimodal Live (barge-in, low latency), and tool calling against real accounts. On Rembrr that includes Gmail, Google Calendar, Drive, cited web search, and tasks.
Backend, AI, and production voice agents
I am Andrés Navarro Gómez, a Backend & AI Engineer. I design and build APIs and conversational systems that ship — live voice, tools, memory — not one-off demos. The public case is Rembrr: the voice and agent backend of a multimodal platform on the App Store.
What I build
RAG and long-term memory
The assistant remembers across conversations: embeddings over pgvector, hybrid ranking (dense + lexical), and fact extraction off the request path so it does not add latency to voice.
FastAPI and NestJS backends
APIs and services in Python (FastAPI) and Node.js/TypeScript (NestJS): multi-tenant systems, queues, integrations, and the wiring an agent needs to take real actions.
How I get to production
This is not a fixed-price package. It is the order I have used to take voice and agents to a shipped product (Rembrr) and backends to platforms in use.
- 1
Diagnosis
Scope voice vs chat, tools, latency, and sensitive data. Without that the model stays a demo you cannot operate.
- 2
Pilot
A thin live path: one conversation, a few tools, latency and task-completion measured. On Rembrr the core was the pipeline that holds a live conversation and dispatches tool calls.
- 3
Production
Memory/RAG, token encryption (on Rembrr: KEK/DEK envelope with Cloud KMS), explicit connection lifecycle, CI/CD. Shipped to the App Store; ongoing work is latency and session stability.
Stack already in production
- FastAPI
- NestJS
- LiveKit
- Gemini Multimodal Live
- OpenAI API
- RAG / pgvector
- PostgreSQL
- GCP / Cloud Run
FAQ
- Is this generic “AI consulting”?
- No. The niche is production voice and chat agents, RAG, and FastAPI/Nest backends — the kind of system behind Rembrr, not a landing-page chatbot.
- Can I commission something like Rembrr?
- Similar voice/chat, tool, and memory systems can be commissioned. Rembrr is an existing product; I designed and built its voice and agent backend (the mobile app is owned by the rest of the team).
- Do you publish rates or packages?
- No. Scope (voice, tools, data, operational bar) changes the work. Email a concrete case and we can talk.
- Do you work remotely from Colombia?
- Yes. I am based in Santa Marta and have worked remotely with teams in Colombia, Mexico, the United States, Chile, and France.
Commission a system
Need a production backend or a voice/chat agent that actually does the work? Email me. No form.
Email andresnavarrodev@gmail.com