Giray Şengönül

Available for freelance data projects

Hi, I'm Giray Şengönül

I'm a

Transforming raw data into actionable insights with Python, SQL, Power BI & Tableau. Former iOS Developer with 4+ years building impactful applications.

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// about

Who I Am & What I Do

Bridging the gap between complex data and meaningful business insights

Experience

2+ Years Data Analytics

4+ Years iOS Development

Professional experience transforming complex datasets into clear, actionable insights and building robust mobile applications.

Education

B.Sc. Computer Engineering

Fırat University, 2020

Strong computer science foundation underpinning both data analysis expertise and software development skills.

GŞ

About

Passionate Data Analyst & Scientist with expertise in SQL, Python (Pandas, NumPy), Power BI and Tableau. Background includes ETL processes, cloud platforms (Azure & AWS), and 4+ years of iOS development with Swift and SwiftUI.

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What I Do for Clients

Freelance data analytics — dashboards, analysis & insight

Dashboards & Reporting

Power BI · Tableau · Excel

Interactive dashboards and decision-ready reports built from your raw data.

Data Analysis & Cleaning

SQL · Python · Pandas

Cleaning, exploring and analyzing messy datasets to surface the real story.

Data Visualization & Insight

KPIs · Storytelling

Turning numbers into clear visuals and insights any stakeholder can act on.

Automation & ETL

Python · Airflow

Automating repetitive data pipelines so reports stay fresh without manual work.

Have a dataset or a dashboard in mind? Let's talk.

Let's work together Email me LinkedIn

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Case Studies & Projects

39+ projects spanning data analytics, visualization, and mobile development

HR Analytics — Employee Attrition Insight

ProblemHR leadership needed to understand why employees leave, so retention budget could target the real drivers instead of guesswork.

ImpactSurfaced the strongest attrition signal so HR could focus interventions where they matter. Built with Power BI, DAX and Power Query.

LAPD Crime Statistics Dashboard

ProblemYears of raw LAPD crime records were impossible to read at a glance — trends, totals and demographics were buried in spreadsheets.

ImpactTurned a static record dump into a self-serve Excel dashboard where any stakeholder can explore crime trends by year and category in seconds.

ESG Risk Analysis — S&P 500

ProblemInvestors needed a fast way to compare Environmental, Social & Governance risk and reputation exposure across the entire S&P 500.

ImpactGave decision-makers a single Power BI screen to rank companies by ESG risk and drill into controversy exposure by sector.

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Projects by category

Browse all by category

Tableau

8 Projects

Power BI

9 Projects

Pandas

7 Projects

SQL

5 Projects

Excel

8 Projects

Python

2 Projects

iOS Apps

App Store

iOS Training

Udemy Courses

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Skills & Technologies

A versatile skill set spanning data analytics, visualization, and mobile development

Data Analytics & Visualization

SQL (Advanced) 95%

Python — Pandas, NumPy 90%

Power BI 90%

Tableau 88%

Excel (Advanced + VBA) 92%

ETL & Apache Airflow 80%

Azure & AWS 75%

iOS App Development

Swift & SwiftUI 93%

MVVM & VIPER Patterns 88%

Core Data & Networking 85%

CI/CD & App Store 82%

Unit & UI Testing 80%

Python SQL Power BI Tableau Excel Swift SwiftUI Azure AWS Git Pandas

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Certificates

19+ professional certifications from IBM, Google, Coursera, UC Davis & Analyst Builder

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What People Say

Recommendations from colleagues, mentors, and collaborators

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GitHub Activity

Live stats pulled straight from my GitHub profile

Giray Şengönül — GitHub contribution graph

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Let's Work Together

Need a data analyst for your project? Let's talk.

Email

giraysengonul@gmail.com

giray-sengonul

GitHub

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