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William Peytz

About

I'm an AI engineer and startup builder based in Copenhagen. I'm currently doing my MSc in Human-Centered AI at the Technical University of Denmark.

Portrait of William Peytz

What I care about is the gap between an interesting model and a product someone actually wants to use. That’s pulled me toward rapid prototyping, full-stack development, and shipping AI systems with real users — adaptive learning platforms, voice agents, anomaly detection pipelines.

Currently

  • On summer break from DTU
  • Looking for my next opportunity in AI-engineering and startups

Experience

  • AI Engineer & Co-founder — Stemma, Copenhagen
    2026
    • Building a Danish-speaking AI phone assistant that handles real customer conversations, including appointment scheduling, bookings, and simple sales.
    • Built and deployed a real-time voice AI pipeline combining ASR, LLMs, and TTS for natural phone conversations.
    • Integrated telephony APIs, backend services, and business systems to enable end-to-end call automation.
    • Working directly with pilot customers to validate product-market fit and continuously improve the product based on real-world usage.
    • Leading product development from prototype to deployment as a technical co-founder.
  • AI Engineer & Co-founder — Simbolic, Copenhagen
    2025 – 2026
    • Built software infrastructure for engineering simulations with a focus on reproducibility and interoperability.
    • Developed tooling to orchestrate simulation workflows across multiple engineering applications.
    • Explored standardized interfaces for reproducible computational engineering pipelines.
    • Worked on improving automation and developer experience for simulation workflows.
  • Mathematics Tutor — Toptutors, Copenhagen
    2021 – 2022
    • Tutored students in calculus, algebra, and probability.
    • Designed interactive digital exercises using GeoGebra and TI-Nspire to improve conceptual understanding.
  • IT & Legal Assistant — Mette Klingsten Law Firm, Copenhagen
    2017 – 2019
    • Automated CRM workflows and document management processes.
    • Built targeted email campaigns and supported the firm's digital operations.

Selected Projects

Full case studies on the projects page.

  • EloQuiz.dk — Adaptive mathematics learning platform that personalizes question difficulty using an Elo-inspired rating system. Built the complete platform using Vue, Flask, Firebase, and the OpenAI API, and validated the concept through a student pilot.
  • Anomaly Detection — Computer vision project for industrial defect detection using DINOv3 and the MVTec dataset. Implemented zero- and few-shot anomaly detection using embedding similarity and patch-level localization.
  • Audio Classification — Deep learning pipeline for musical instrument recognition. Developed CNN and LSTM models capable of classifying 15 instrument classes with 96–98% accuracy.
  • EasyLINC 2.0 — Accessible ride-ordering solution designed for elderly users. Led UX research, iterative prototyping, and user testing to improve accessibility and ease of use.

Education

  • MSc Human-Centered Artificial Intelligence
    Technical University of Denmark (DTU)
    2025 – 2027
    Focus areas include Deep Learning, Computer Vision, Computer Graphics, Human-AI Interaction, and Entrepreneurship.
  • BSc Artificial Intelligence and Data
    Technical University of Denmark (DTU)
    2020 – 2025
    Bachelor's thesis: Adaptive Learning Systems (EloQuiz.dk)
    Relevant topics included Machine Learning, Reinforcement Learning, MLOps, Software Engineering, and UX Design.
  • Economics
    University of Copenhagen
    Completed one year of undergraduate studies in Economics.

Technical Skills

Programming Languages

  • Python
  • TypeScript
  • SQL

AI & Machine Learning

  • PyTorch
  • scikit-learn
  • Deep Learning
  • Large Language Models
  • Voice AI
  • OpenAI API

Backend

  • FastAPI
  • Flask

Frontend

  • Vue.js
  • React

Infrastructure

  • Docker
  • Firebase
  • Supabase
  • Vercel

Languages

  • Danish (Native)
  • English (Fluent)

Contact