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
Based
Ankara, Turkey
Shipping
3 iOS apps in TestFlight
Past Experiences
Data Analyst, hop Technology
TA, Business Analytics
Education
B.Sc. Management, Bilkent University
Graduated with CGPA 3.69/4.00
Magna Cum Laude
6th of 159 graduates
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 Explore Figdex →
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 Explore MyEtho →
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 Explore PortfolioLab →
PortfolioLab portfolio overview
PortfolioLab live watchlist
PortfolioLab Risk Lab — Sharpe and portfolio σ

Stack

The toolbox