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pawel-zajac-dev/README.md

Hi! Welcome to my GitHub profile

I’m a Machine Learning Engineer / Data Scientist with a strong mathematical background and a passion for building models that are interpretable, probabilistic, and statistically sound.

My work focuses on combining machine learning, Bayesian inference, and stochastic modeling to analyze complex and noisy data. Professionally, I work as a Pay Equity Specialist / Data Analyst at Mercer, applying statistical modeling in workforce and compensation analytics.

Specializations

  • Probabilistic & Bayesian Machine Learning – Bayesian regression, Naive Bayes, MCMC, MAP, variational inference, uncertainty modeling
  • Reinforcement Learning & Bandits – Epsilon-Greedy, UCB, Thompson Sampling, exploration–exploitation frameworks
  • Time Series & State-Space Modeling – ARIMA family, VAR, GARCH, HMMs, Kalman filtering, spectral methods
  • Stochastic Processes – DTMCs, CTMCs, Wiener processes, Brownian motion, Gaussian processes
  • Statistical Inference & Experimental Design – hypothesis testing, A/B testing, Bayesian vs Frequentist methods
  • Machine Learning Engineering – model selection, Bayesian optimization, CV, pipelines, reproducibility

Current Interests & Applications

I actively expand my skills in applying ML methods to real-world problems, including:

  • Recommender Systems – collaborative filtering, content-based filtering
  • Natural Language Processing (NLP) – LSI, text representation and semantic analysis
  • Dimensionality Reduction & Feature Engineering
  • Applied Predictive Analytics and Decision Modeling

I enjoy designing models that explain mechanisms behind data, simulating complex dynamics, and extracting signal from uncertainty.

GitHub Loop

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  1. Classical-Machine-Learning Classical-Machine-Learning Public

    This repository contains implementations of core machine learning algorithms written from scratch, following their mathematical formulations rather than relying on high-level libraries like scikit-…

    Jupyter Notebook

  2. Bayesian-Reinforcement-Machine-Learning Bayesian-Reinforcement-Machine-Learning Public

    This project explores data analysis, blending core Probability Theory and Descriptive Statistics with Statistical Inference and Bayesian Machine Learning (Regression/Classification). It concludes w…

    Jupyter Notebook 1

  3. Time-Series-Models Time-Series-Models Public

    This repository contains a collection of time series analysis and forecasting projects, featuring both classical statistical models and deep learning approaches.

    Jupyter Notebook 3

  4. Hidden-Markov-Models Hidden-Markov-Models Public

    DTMCs, HMMs, Gaussian HMMs, second-order HMMs, etc.

    Jupyter Notebook 3

  5. Continuous-Stochastic-Processes Continuous-Stochastic-Processes Public

    Poisson, Wiener & Gaussian processes, CTMCs, SDEs, Brownian motion

    3

  6. Natural-Language-Processing Natural-Language-Processing Public

    Jupyter Notebook 3