Portfolio • Data & Research Analytics

Hande
Pehlivan

Data analyst focused on data quality, reporting, and applied analytics across healthcare, research, and business contexts.

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2M+
Customer Records Analyzed
8+
Projects Delivered
6+
ML Models Built
90%
Best Model Accuracy

Turning data chaos
into strategy.

I’m a data analyst who transforms messy, multi-source data into clean, trustworthy dashboards and reports that drive business decisions. I specialize in building semantic data models, defining KPIs, and delivering insights that stakeholders can act on.

I’ve supported stakeholders with dashboards and recurring reporting across nonprofit programs and telecom combining SQL, Python, Excel, and Power BI . My strength is translating business questions into structured analyses and communicating findings clearly to both technical and non-technical stakeholders.

My academic foundation includes an MS in Analytics (Georgia Tech) and an MS in Biomedical Engineering (Illinois Tech), giving me experience with data quality standards, statistical rigor, and working effectively in high-accuracy environments.

Analytics & Data
PythonSQLR pandasNumPySciPy
Machine Learning
scikit-learnTensorFlowKNN Random ForestSVMLogistic Reg.
Visualization & BI
TableauPower BIMatplotlib SeabornSAS
Tools & Platforms
Git / GitHubDockerAWS AzureJupyterExcel

Where I've worked

Professional roles that shaped my analytics and engineering skill set.

Data Analyst (Volunteer) Jan 2025 – Present
Be The Voice · Remote
  • Conduct comprehensive data analysis on multi year engagement datasets spanning 130+ institutions to identify trends, outliers, anomalies, and questionable patterns in program compliance
  • Perform SQL database queries to extract and research large datasets; develop data history analysis to support program assessment
  • Build dashboards communicating findings to non technical stakeholders for operational decisions
  • Standardize data preparation with comprehensive QA checks (missing fields, duplicates, logic validation) improving reliability of trend reporting
  • Identify data irregularities requiring investigation through systematic validation methodologies
Data Scientist Intern 2023
US Cellular · Chicago, IL
  • Analyzed 2M+ customer records with Power BI & SQL to identify demographics and behaviors driving churn.
  • Built and refined predictive models in SAS & SQL to forecast customer trends for marketing teams.
  • Delivered interactive Tableau dashboards for senior leadership with clear, decision ready visualizations.
  • Partnered with Marketing & Finance cross functional teams to validate and cleanse data, boosting churn analysis accuracy.
Biomedical Engineer 2019
Baxter International Inc. · Round Lake, IL
  • Performed engineering testing for medical device components under FDA-aligned procedures
  • Cleaned, validated, and organized test datasets; verified completeness before sharing with senior engineers
  • Built Excel tracking tools to monitor quality metrics and flag anomalies
  • Supported regulated documentation and cross functional technical reviews

Academic foundation

M.S. Analytics / Data Science
Georgia Institute of Technology · Atlanta, GA
2021 – 2024 GPA 3.41
M.S. Biomedical Engineering
Illinois Institute of Technology · Chicago, IL
2018 – 2019 GPA 4.0
B.S. Biomedical Engineering
Namik Kemal University · Turkey
2011 – 2015 GPA 3.47 Valedictorian
Relevant focus
Data quality, reporting, and applied analytics
Statistics Machine learning Simulation Healthcare data

What I've built

● Retention Rate ● Churn Rate Month 1 Month 6 Month 12
Customer Churn Analysis & Prediction Business

End to end churn analysis pipeline: exploratory data analysis on 2M+ telecom customer records, feature engineering, segmentation by demographics and usage behavior, and a predictive classification model. Delivered retention strategy recommendations backed by monthly trend dashboards.

Control: $150 Treatment: $168 Lift +4.2%
Airbnb Pricing Engine + A/B Test Simulation ML

Built an end to end NYC Airbnb pricing model (EDA → feature engineering → Random Forest vs Gradient Boosting). Added an experimentation module that simulates an A/B test (Control: current prices vs Treatment: model recommended prices) and estimates revenue lift with bootstrap p-values.

● KNN (90%) ● LogReg (88%) ● SVM (85%) TPR FPR
Heart Disease Prediction (ML Comparison) ML

Compared 6 ML classifiers (KNN, Logistic Regression, SVM, Naive Bayes, Random Forest, Neural Network) on the UCI Heart Disease dataset. KNN achieved the best test accuracy at 90%. Includes full preprocessing, EDA, ROC analysis, and confusion matrices.

● Susceptible ● Infected ● Recovered Day 0 Day 15 Day 30
Pandemic Flu Spread Simulation Simulation

Simulated influenza spread in a 21 student classroom using 100K Monte Carlo iterations and a discrete SIR model. Validated simulation output against theoretical Binomial distributions. Compared SIR vs. simulation across multiple scenarios.

Conversion 4.7% Avg Order $ $142 Churn Rate 3.2% 60%
Statistical Analysis Dashboard Business

Built an interactive analytics dashboard surfacing key business KPIs: conversion rates, churn metrics, customer segments, and trend sparklines. Designed for executive level storytelling with drill down capability.

● Price ● 30d MA Jan Jun Dec
StockMiner — Financial Literacy App App

Analyzed 3M+ rows of historical stock data to build predictive insights and an interactive financial literacy interface. Increased financial understanding for 77.8% of novice investors in user testing.

ID Vehicle Status Revenue #001 2022 Honda Civic Sold $18,500 #002 2021 Toyota RAV4 Listed $24,000 #003 2023 Ford F-150 Sold $38,200 #004 2020 BMW 3 Series Total Revenue $113,200
BuzzCars — Inventory Management Full Stack

Built an inventory and financial tracking system for a used car dealership. Streamlines customer interaction data collection and revenue reporting with a MySQL backed dashboard.

Let's work
together.

I’m open to data analyst roles (healthcare or business). If my portfolio resonates, feel free to reach out.

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