Efe Çavuşoğlu

Data scientist. Building consumer apps for the things I’m into.

About

Summary

Efe Çavuşoğlu

I’m a data scientist at Quin AI, where I build ML pipelines, segmentation models and customer analytics products in Python and PySpark. I also work with the product team on how our data gets used — designing the analytics panels and reports people actually look at.

Outside that, I build consumer iOS apps end to end — the idea, the product decisions, the design. I only build things I'd want to use myself: Figdex came from my LEGO passion, MyEtho from my love of tuning cars, and PortfolioLab because I wanted a personal finance app that actually suited me.

For more detailed information about me, please refer to my CV.

Role
Data Scientist, Quin AI
Degree & Rank
B.Sc. Management, Bilkent University
Graduated with CGPA 3.69/4.00
Magna Cum Laude
6th of 159 graduates
Based
Ankara, Turkey
Past Experiences
Data Analyst, hop Technology
TA, Business Analytics
Shipping
3 iOS apps in TestFlight
Into
Movies · Cars · Technology · Photography · Travel · LEGO

Apps

Things I built
because I wanted them

Figdex

LEGO collection tracker

I’ve been building LEGO since I was a kid and never stopped — somewhere along the way I lost track of what I actually owned. Figdex fixed that: browse your collection with theme and minifig breakdowns, track a wishlist through set retirements, import from Rebrickable or Brickset, and follow new releases in a personalised Discover feed.

  • Firebase
  • Rebrickable API
Currently in TestFlight — App Store release 2026
Figdex collection screen
Figdex set detail
Figdex Discover feed

MyEtho

the ethanol suite

I run ethanol blends in my car and got tired of guessing what was in the tank. MyEtho fixed that: calculate any fuel blend, work out exactly how much gas and ethanol to add to hit a target — even to fill the tank to a set blend on your next stop — all without any hardware. Pair a flex fuel sensor over Bluetooth and it adds live ethanol and temperature readings, logged with a chart and CSV export.

  • CoreBluetooth
  • BLE hardware
Currently in TestFlight — App Store release 2026
MyEtho live ethanol reading
MyEtho mix calculator
MyEtho fuel blend calculator

PortfolioLab

Investing companion, built for risk

Portfoliolab provides live BIST, forex and gold tracking with real portfolio P&L, plus the risk analysis retail investors here rarely get in a phone app: Sharpe ratio, portfolio σ, and diversification breakdown.

  • SwiftData
  • Swift Concurrency
  • Live market data
Currently in TestFlight — App Store release 2026
PortfolioLab portfolio overview
PortfolioLab live watchlist
PortfolioLab Risk Lab — Sharpe and portfolio σ

Stack

The toolbox