Kristina Matrosova
ML Engineer | Data Scientist (PhD)
Salary / Daily rate
Paris, France
Freelance
Remote only
Skills
Languages
About me
Intro
Computer engineer specialized in data science and machine learning, with strong experience building production-ready data and AI products. I hold a PhD in Computer Science completed in an industry setting, focused on large-scale recommender systems. I work end to end on ML and LLM models, backend services and APIs, cloud deployment on GCP, and scalable data architectures, with a strong focus on reliability, scalability, and real-world impact.
Work experience
CTO & Lead ML Engineer
TopTiers Labs
Feb 2025 - Present
1 year 9 months
Responsible for the design and development of a SaaS platform for email analytics and deliverability, integrating with multiple email outreach and messaging systems. The platform enables automated analysis and classification of email events using data, machine learning, and large language models, and relies on API- and webhook-based integrations. The role combines technical leadership and hands-on engineering across product architecture, backend and data systems, and ML in production, with ownership of cloud infrastructure on GCP, model deployment, scalability, and cost optimization.
Deezer
Apr 2020 - Dec 2024
4 years 9 months
Paris, France
PHD
Oct 2020 - Dec 2024
4 years 3 months
Paris, France
PhD in Computer Science, focused on modeling user preferences and understanding the impact of recommender systems on music streaming platforms. The research explored how different ways of modeling user tastes influence recommendation outcomes, and how recommender systems can introduce biases and feedback loops that shape users’ listening behavior over time. The work relied on large-scale listening and involved training and evaluating recommendation models, large-scale data analysis, and production-oriented data infrastructures (Python, SQL, BigQuery, PySpark).
Research Engineering Intern
Apr 2020 - Oct 2020
7 months
Paris, France
Developed a backend service enabling users to import their music favorites from other streaming platform into their Deezer account through catalog matching.
Research Engineer
Centre national de la recherche scientifique
Nov 2023 - Mar 2024
5 months
Paris, France
Studied the correlation of human mobility and Covid-19 spread in Lebanon in 2020, based on Facebook user mobility logs and reports from the Lebanon Ministry of Public Health.
Associate Teacher
Paris 1
Sep 2021 - Dec 2021
4 months
Associate Teacher
Université Sorbonne Paris Nord
Nov 2020 - Jul 2021
9 months
Research Intern
IRCAM
Apr 2019 - Jul 2019
4 months
Paris, France
Developed and experimented with deep learning models for symbolic music generation, inspired by Bach-style harmonization approaches.
Full Stack Developer
Davay App
Sep 2018 - May 2019
9 months
Paris, France
Built and maintained full-stack mobile application features in a startup environment, from frontend to backend.
Education
Université Sorbonne Paris Nord
Doctor of Philosophy - PhD, Computer Science
2020 - 2024
4 years 1 month
Université Sorbonne Paris Nord
Master's degree, Data Mining, Analytics and Knowledge Discovery
2018 - 2020
2 years 1 month
Université Sorbonne Paris Nord
Bachelor's degree, Computer Science
2015 - 2018
3 years 1 month
Lycée Français de Moscou Alexandre Dumas
High School Diploma, Mathematics
2003 - 2015
12 years 1 month