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Juan Mugica GonzalezJM

Juan Mugica Gonzalez

Senior AI Engineer · ex-Google · Voice AI

€1,500/day
Madrid, ES
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Juan

Senior AI Engineer at Quadrivia, where I lead the work that makes our voice agents for healthcare reliable in front of real patients. I have rebuilt the conversational orchestrator, reducing latency by ~1s per turn, creating a sub-agent pattern that detects clinical red flags in real time, designed an answering machine detector that went from 50% to >93% detection, and am currently building Starfish, a testing platform where AI agents simulate patients to stress-test production agents.

Previously, I co-founded Amrap, a real-time AI personal trainer: a voice-first iOS app + multi-agent backend that generated personalized routines and coached in the gym. I designed the orchestration combining LLM reasoning with deterministic validators, reducing hallucinations by 95% with voice latencies <2s. We took the product from zero to paying users.

Before that, Cloud Architect at Google (2.5 years), enterprise accounts, closing multi-million € contracts and building cloud solutions at scale.

I help companies take AI agents from demo to production: architecture, voice/conversational AI, multi-agent systems, evaluation frameworks, reliability, and latency. Available for fractional projects (1-2 days/week) and ad-hoc technical consultations.
  • Spanish

    Native or bilingual

  • French

    Fluent

  • English

    Native or bilingual

Can work on-site
Madrid (up to 50km)

Experience

  • Amrap
    Founder, Tech Lead
    HEALTH AND WELLNESS
    November 2024 - February 2026 (1 year and 3 months)
    New York, NY, USA
    Cofounded Amrap, a real-time AI personal trainer that builds personalized strength routines and coaches users live on the gym floor through voice and video.

    - Designed and built the end-to-end product: voice-first iOS app and a multi-agent backend that generates high-personalization routines and coaches workouts in real time, calling out weights and reps, teaching technique, and answering exercise questions on the spot.
    - Architected an agent orchestration layer combining LLM reasoning with deterministic and LLM-based validators, cutting hallucinations by 95% and engineered patterns so the remaining 5% wouldn’t degrade the UX.
    - Tuned the system for in-gym latency: sub-2-second voice responses during coaching and full routine generation in 30 to 60 seconds, with on-the-fly adaptation to the exact equipment available and to user feedback mid-session.
    - Built the platform on clean-architecture principles using a microservice setup on GKE (Kubernetes), with Swift on the client, LiveKit for low-latency voice, PydanticAI for agent adapters, React for web, and SQL plus Firestore for persistence.
    - Took the product from zero to a few paying users. We didn’t figure out distribution before I left.
    LLM Evaluation Voice AI LLM Conversational AI Python
  • Google
    AI & Cloud Architect
    July 2022 - November 2024 (2 years and 4 months)
    Paris, France
    Building AI and Cloud solutions for corporations launching new service offerings or looking to improve operational efficiency. Leading the development process from ideation to proof-of-concept and production deployment. Sample projects include AI agent development, AI-powered recommendations, data platform development and transition to cloud.
    Google cloud Cloud Architecture AI Agents Voice AI Data Platform
  • MIT Media lab
    Research Collaborator
    ARCHITECTURE AND URBAN PLANNING
    September 2020 - January 2022 (1 year and 4 months)
    Cambridge, United States
    Developed a bio-inspired framework for future mobility allowing autonomous vehicles to move more efficiently. Designed and built a vehicle-to-vehicle energy-sharing system, so future vehicles can share power while moving, extending their range in a decentralized and cost-efficient manner. Validated the framework through agent-based simulations.
    Research Architecture and Urban Planning

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Education

  • Master in International Leadership
    Fundación Rafael del Pino
    Master
  • Double Degree - Engineering
    CentraleSupélec
    2021

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