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Sergio W.SW

Sergio W.

Machine Learning Engineer

€130/day
Lisbon, PT
0-2 years

Average response time: 1 hour

About Sergio

I specialize in taking trained models and turning them into deployable services with real-time inference, clean interfaces, and reproducible pipelines. My focus is on making ML systems accessible, scalable, and production-oriented rather than purely experimental.

Core focus areas:

Deployment of machine learning models using Hugging Face Spaces and Gradio
Backend integration for ML inference workflows
Data preprocessing, feature engineering, and model training in Python
Building end-to-end pipelines from dataset to deployed application
API-style model serving and interactive web interfaces

Selected project:
ATP Prediction Engine – Alpha Decay Market Regime Analysis
A structured ML system for probabilistic prediction and regime analysis, combining statistical modeling and feature-based forecasting.
GitHub:
Deployment experience:
Deployed machine learning models on Hugging Face with Gradio interfaces, enabling interactive inference and demonstrating practical backend deployment of ML systems.

Technical stack:
Python, pandas, NumPy, scikit-learn (applied), Hugging Face, Gradio, Jupyter, data visualization tools
  • Portuguese

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Personal Project
    Machine Learning Engineer
    January 2026 - April 2026 (3 months)
    Machine Learning Engineer (Freelance / Independent)


    Self-initiated project | 2024 – Present

    Designed and built an end-to-end machine learning system for predicting ATP match outcomes
    Engineered 40+ temporal features (Elo ratings, fatigue, surface performance) from historical sports data
    Trained and optimized LightGBM models using Optuna, achieving strong probabilistic calibration (0.96 slope)
    Implemented walk-forward validation on 50k+ samples to simulate real-world deployment
    Conducted financial backtesting to evaluate model performance under different market regimes
    Identified and quantified alpha decay in efficient markets, with divergence between sharp and soft bookmakers
    Developed a live inference API using FastAPI and deployed an interactive interface (Gradio)
    Built monitoring components for model drift and retraining triggers
    Machine learning Python Data analysis

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Education

  • High School Diploma
    Raffles American School
    High School Diploma
  • Enrolled Student
    Reed College (Physics major)
    Incoming Student

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