José GuzmánMessage me on LinkedIn

AI Engineer · Quito, Ecuador · Open to remote

I build the reliability layer under LLM agents in production — and the measurement that proves it holds.

Backend, Python, LangGraph, RAG, FastAPI. Four years across Python, Scala and TypeScript, from a platform with over a million users to systems I still operate.

Message me on LinkedIn GitHub ↗

Experience

open a role to see what I built there

AI Engineer · contract @ Agents BoosterMay 2026 – Aug 2026 · 4 mos

Reliability layer, evals and tracing for LLM sales agents.

  • Grounding layer for an LLM sales agent

    Every claim checked against the live catalog

  • Agent evaluation suite

    Scenarios run on repeat to measure stability

    13 suites

  • LLM observability

    Langfuse and LangSmith traces per conversation

  • Automated tests for the web console

    It had none when I arrived

    1,405 tests

  • Payments end to end

    Links, webhook validation, state machine, refunds

Software Developer @ Stack BuildersMay 2025 – May 2026 · 1 yr 1 mo

Software consultancy serving international clients.

  • Live scores for alpine ski competitions

    Server-sent events and HTMX, no more manual reloads

  • Federation rules

    International and US rules, needed for sanctioned events

  • Computer-vision dataset

    Labelled data for automatic jump scoring (YOLO on SageMaker)

  • Vue 2 → Vue 3 migration

    Nuxt, Tailwind, components rebuilt around composables

Software Engineer @ TorreJun 2024 – Apr 2025 · 11 mos

Process layer under a multi-agent LLM hiring system.

  • Five-stage agent pipeline

    Langchain4j over Scala, retrieval on Pinecone

  • Business-process layer under the agents

    Code owner; thousands of openings in automated flows

  • WhatsApp consent flow

    Hold the message until the candidate opts in

    >½ fewer blocks

  • Delivery failures traced and cleared

    Notifications stalled awaiting callback

    ~3,500

Co-Founder & Lead Software Engineer @ DynecronJan 2024 – present · 2 yrs 10 mos

Company I co-founded. Projects end to end, teams of up to five.

  • Workshop management system

    Running since Jul 2025, later a white-label product

    971 work orders

  • Freight forwarder operations platform

    Nine people run their day on it

    324 shipments

  • Multi-company ERP with e-invoicing

    Onboarding its first company

    1,886 backend tests

  • Auditable RAG over procurement law

    Versioned legal corpus, any analysis can be replayed

Frontend Developer · freelance @ AI Dev GroupDec 2023 – Mar 2024 · 4 mos

Front end of an AI advertising-content product.

  • Front end rebuilt

    Duplicated logic into hooks, React Query for server state

  • Component library in Storybook

    Built and tested in isolation before composing screens

  • Real-time layer

    Websockets to an OpenAI-backed service

  • Credits and payments

    Users buy credits through PayPal

Software Engineer Intern @ TorreMay 2023 – Dec 2023 · 8 mos

First engineering role, on a platform with over a million users.

  • Notification pipeline fix

    An ORM defect was silently dropping tens of thousands

  • Squad metrics

    Defined in SQL on Metabase, read daily

  • WhatsApp templated messaging

    Delivered through Twilio

Frontend & Mobile Developer @ IQ BitAug 2022 – May 2023 · 10 mos

Four production apps across web and mobile, two in the app stores.

  • Production apps shipped

    React, React Native and WordPress

    4 apps

  • App Store and Google Play

    iOS and Android release pipeline, end to end

    2 apps

  • Responsive WordPress site

    Built from a designer’s mockup, still live years later

Activity

2,766 contributions in the last yeargithub.com/joseguzmann ↗
  • 2026 2,668
  • 2025 564
  • 2024 598
  • 2023 142
  • 2022 139

2,642 of them are in private repositories — GitHub counts them without showing them. Updated 2026-10-08.

Systems I built

How a project runs

deliver.yml · on: your first message

Jobs
4
Artifacts
3
Owner
José, end to end

  1. 01 · scope

    We meet, I learn how your business actually runs, and we agree in writing on what gets built. Contract and NDA included.

  2. 02 · build

    Architecture, backend, frontend, tests and CI/CD. You see working software early and test each feature as it lands.

  3. 03 · ship

    Docker, CI/CD and deployment. Nothing is “done” until the people it’s for are using it every day.

  4. 04 · run

    I stay on after launch. You write different code when your name is on the invoice.

Skills

  • LLM systems

    • LangGraph
    • LangChain
    • Langchain4j
    • RAG and vector search (pgvector, Pinecone)
    • Agent evaluation (promptfoo)
    • Observability (Langfuse, LangSmith)
    • Tool design

  • Languages

    • Python
    • TypeScript
    • JavaScript
    • Scala
    • Java
    • SQL

  • Backend

    • FastAPI
    • Django
    • Flask
    • Play Framework
    • Node.js

  • Frontend

    • React
    • Next.js
    • Vue
    • Angular
    • React Native

  • Data & infra

    • AWS
    • Docker
    • PostgreSQL
    • MongoDB
    • Redis
    • RabbitMQ
    • Event-driven architecture
    • GitHub Actions
Education
B.Eng. in Computer Science
Escuela Politécnica Nacional · Quito, Ecuador · Oct 2025
Spoken
Spanish (native) · English (EF SET C2)

open to remote

Building agents that have to hold up in production?

AI and backend engineering roles, or a system you need built and run.

Message me on LinkedIn