Profile Details

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Hire Marijana V.

Serbia

USD 80 /hr

Data Scientist | Machine Learning, Analytics & Decision Systems

Profile Summary

I’m a Data Scientist with 6 years of experience building machine learning and data-driven solutions, with a particular background in fraud detection, behavioral analytics, customer segmentation, and risk modeling. My work has covered the full lifecycle from exploring complex datasets and identifying useful signals, through feature engineering and model development, to translating results into practical product and business decisions. I’ve worked with supervised, unsupervised, and semi-supervised machine learning, interpretable modeling, and large-scale data pipelines using Python, SQL, Databricks, and AWS. More recently, I’ve also worked on applied AI and LLM systems, including RAG pipelines for complex documents and structured data, multi-provider LLM infrastructure, and retrieval and citation systems. This included taking these systems beyond prototypes, with attention to reliability, observability, and data security. I also have several years of experience leading Data Science teams and projects and working directly with enterprise clients. My work has involved understanding customer problems and requirements, collaborating with Product, Engineering, and customer-facing teams, communicating technical trade-offs to non-technical stakeholders, and translating ambiguous business problems into well-defined analytical work and production solutions. I’m interested in projects across machine learning, applied AI, behavioral and customer analytics, segmentation, fraud and anomaly detection, predictive modeling, and data-driven decision making. I’m also open to adjacent Data Science problems where my technical and analytical background can be applied to new domains.

Subject Matter Expertise

• ★ Predictive Modeling & Analytics
• ★ Big Data Analytics
• ★ Machine Learning
• ☆ Data Analysis
• ☆ Data Processing
• ☆ Data Exploration
• ☆ Cluster Analysis
• ☆ Data Visualization
• ☆ Data Manipulation
• ☆ Text Mining & Analytics
• ☆ Data Cleaning
• ☆ Pattern Recognition
• ☆ Artificial Intelligence
• ☆ Statistics
• ☆ Applied Statistics
• ☆ Regression Analysis
• ☆ Multivariate Analysis
• ☆ Nonlinear Regression
• ☆ Bayesian Statistics
• ☆ Correlation Analysis
• ☆ Trend Analysis
• ☆ Python
• ☆ SQL
• ☆ R
• ☆ Project Management

Services

• Data & AI

Data & AI Predictive Modeling, Statistical Analysis, Algorithm Design-Non ML, Algorithm Design-ML, Data Visualization, Big Data Analytics, Text Mining & Analytics, Data Mining, Data Cleaning, Data Processing, Data Insights

Work Experience

AI Engineer

X&

September 2025 - January 2026

Data Science Manager

Telesign

March 2024 - August 2025

Senior/Lead Data Scientist

Telesign

January 2022 - March 2024

Data Scientist

Telesign

January 2021 - December 2021

Junior Data Scientist

Telesign

November 2019 - December 2020

Education

M.Sc (Master of Science)

UNIVERSITY OF CAMBRIDGE

October 2015 - June 2019

Certifications

• Certification details not provided.