Software Engineer
currently crafting mobile apps
I build mobile apps and websites — from the first screen to the last detail. I'd rather ship one thing properly than three things halfway.
Who I am
I'm Batuhan Berk Ertekin, a software engineer based in Ankara, Turkey, focused on mobile and web application development. I care about clean architecture, performance and the small details that make software feel effortless.
Alongside my professional experience and open-source work, I design, build and publish my own products through FlowByte Studio — from AI-powered creativity tools to personal finance apps.
I keep a list of apps I want to build — it never gets shorter ✏️
Career
Turkcell Geleceği Yazanlar · Remote, Türkiye
Selected as one of 35 participants among 5,000 applicants for Turkcell’s "Gençlere Yatırım, Geleceğe Yazılım 5.0" program. Built Android UI screens and reusable components with Kotlin and Jetpack Compose, applying state management, app lifecycle and modern Android best practices.
VBT Yazılım A.Ş. · Ankara, Türkiye
Worked with cross-functional teams on enterprise software: Flutter and Swift mobile clients backed by Java (Spring Boot) and C# (.NET Core) services, event-driven messaging with RabbitMQ, SQL query optimization, and Agile/Scrum delivery with enterprise monitoring tools (BMC Helix, Grafana).
GİB Teknoloji · Ankara, Türkiye
Developed and optimized UI tests for the GİB mobile app — used by 10M+ people — using Maestro: automated test scenarios across platforms and devices, detailed test reports, and UI tests integrated into CI/CD pipelines for reliable releases.
Leonardo Türkiye · Ankara, Türkiye
Developed a high-performance real-time audio/video calling app with Flutter and WebRTC, and built a real-time temperature & humidity telemetry system for UAVs using Arduino and C — sensor integration, calibration and data analysis for aerospace operations.
Leonardo Türkiye · Ankara, Türkiye
First hands-on exposure to professional software engineering in aerospace.
Google Play
My own products — designed, built and shipped solo under FlowByte Studio, the label I publish them on.
Driving Licence Exam Prep
Prepare for your driving licence exam with 2,400+ past questions, detailed explanations and realistic e-exam mock tests.
Google Play ↗
AI Image Generator
Turn text prompts into artwork with state-of-the-art AI image generation.
Google Play ↗
Budget & Expense Tracker
Track spending, set budgets and take control of your personal finances.
Google Play ↗
GPA Calculator & Tracker
Calculate semester and cumulative GPA, and plan the grades you need.
Google Play ↗
QR Scanner & Generator
Scan any QR code or barcode instantly — and generate your own in seconds.
Google Play ↗GitHub
Three projects that best represent how I approach product thinking, mobile engineering and maintainable software.
Featured 01 · iOS product
My roleiOS Developer
Problem
Expenses, income and crypto holdings often live across separate tools, making a complete financial picture difficult to read.
What I built
I built a bilingual SwiftUI finance tracker that combines daily transactions, visual reports, crypto holdings, widgets and AI-powered guidance in one product.
Engineering highlights
Stack
Featured 02 · Full-stack starter
My roleFull-Stack Mobile Developer
Problem
Authentication is repeatedly rebuilt across the mobile client, API, verification emails and deployment infrastructure.
What I built
I created a reusable SwiftUI and .NET 8 starter covering registration, JWT sign-in, email verification, password reset, automated tests and cloud deployment.
Engineering highlights
Stack
Featured 03 · Android capstone
My roleAndroid Developer
Problem
A car-sharing client must coordinate identity, live vehicle state, reservations, rentals and payments without exposing backend complexity.
What I built
I developed an Android client with passwordless OTP, MapLibre vehicle discovery, reservation and per-minute rental flows, live Socket.IO tracking and wallet payments.
Engineering highlights
Stack
Looking for more experiments, coursework and smaller builds?
Browse all 60+ repositoriesAcademic
Selçuk University · Konya, Türkiye