Kerem Göbekcioğlu

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Turkish-first astrology app, Kotlin Multiplatform, live on Google Play with iOS in App Store review.

A Turkish-first astrology app built from a single Kotlin/Compose Multiplatform codebase for Android and iOS, taken through signing, store listing, and production release on Google Play — the iOS version is currently under App Store review.

• Three-tier content pipeline (Room cache → Firestore → external API) with period-aware cache validation for daily and monthly content.
• TypeScript Cloud Functions backend that enriches templated horoscope data using the Gemini API on a schedule, with retry and model-fallback logic for quota and timeout failures.
• Push notifications on both platforms from scratch, Firebase Anonymous Auth, and per-user Firestore security rules.
• Native sharing that renders horoscope cards to PNG and shares them directly to Instagram Stories via platform intents.

• Kotlin Multiplatform
• Compose Multiplatform
• Room
• Firebase Auth
• Firestore
• Cloud Functions (TypeScript)
• Gemini API
• FCM/APNs

• Google Play →
• Landing page →
• GitHub →

Agentic Sprint Planner

Multi-agent AI pipeline that turns raw epics into an assigned sprint board, built to learn backend and multi-agent system design.

My second grad project, taken on specifically to get into backend development and learn how to design multi-agent AI systems. A full-stack tool that automates sprint planning end to end — from raw epics to an assigned sprint board — using four focused AI agents (breakdown, estimation, capacity, distribution) instead of one general-purpose call, so each agent stays narrow and failures are easy to isolate. It integrates with Trello to publish approved plans as real cards, and keeps a persistent team memory of velocity and history so later sprints get sharper suggestions. Built working closely with Claude Code — planning the architecture together, then splitting features into focused implementation runs — and deployed end to end on Railway and Vercel.

• Java 21
• Spring Boot 3
• PostgreSQL
• JPA/Hibernate
• Flyway
• React
• TypeScript
• Zustand
• TanStack Query
• Tailwind
• Gemini API
• Trello API
• Railway
• Vercel

• GitHub →

Smart Reading Assistant for Visually Impaired Users

Glasses-mounted AI assistant that reads printed text aloud, in about 3–4 seconds, powered by Gemini.

A wearable AI assistant that helps visually impaired users understand printed text — menus, documents, labels — just by asking out loud. Rather than aiming a phone at text, the camera is built into a glasses frame so it naturally follows where the user is looking; they press a button, ask a question, and hear a spoken answer in about 3–4 seconds, powered by Gemini 2.5 Flash. Built as a graduation project at Gebze Technical University.

• C++
• ESP32-CAM
• BLE
• Kotlin
• Jetpack Compose
• Hilt
• Retrofit
• Room
• Gemini 2.5 Flash

• GitHub →
• Demo video →

MindFlux — 2.5D Game with Custom Hardware Controllers

2.5D Unreal Engine runner playable via keyboard, joystick, motion bracelet, or head tracking — I built the hardware-to-game bridge.

A 2.5D endless runner built in Unreal Engine, playable four different ways — keyboard, a custom joystick, a motion-sensing wrist bracelet, or head movement tracked by camera. My part was the software bridge connecting all of the custom hardware to the game: a C++ SerialPort class inside Unreal that opens and reads from three completely different sources through the same interface — a serial line for the joystick, a Bluetooth RFCOMM device for the motion bracelet, and a FIFO named pipe for head-tracking data from a teammate's Python/OpenCV pipeline — with no third-party plugins. On the character side, I wrote the polling and parsing logic that turns each device's raw data into game input. CV processing was heavy enough to hurt performance on the main thread, so we moved it to its own thread.

Best bug of the project: the game would silently hang on launch, no error, just a frozen screen. Turned out one FIFO was opened in blocking write mode before Unreal had opened its read end — a named pipe write just sits there waiting for a reader that doesn't exist yet.

• Unreal Engine
• C++
• IPC (Named Pipes/FIFO)
• Multithreading & Concurrency
• Serial Communication (UART/Bluetooth RFCOMM)
• POSIX System Calls

• GitHub →

aIoT — Smart House Controller App

Voice-controlled smart home app with real-time intruder photo alerts, across Raspberry Pi, ESP8266, and Android.

A distributed smart home system built for CSE476 (Mobile Communication Networks) — voice-controlled lights and real-time intruder alerts with photos, all over the local network, across a Raspberry Pi server, an ESP8266 relay, and an Android app. I built the Android app: record a voice command, send it to the Pi over the network, and get a push notification with a photo if the Pi's camera flags an unrecognized face. The app also runs its own lightweight HTTP server (NanoHTTPD) just to receive those intruder images from the Pi. The trickiest part was Retrofit — its base URL isn't known at build time since the Raspberry Pi's local IP can change — so I built a RetrofitManager that rebuilds the Retrofit instance at runtime whenever the user enters a new IP, persisting it so the app reconnects correctly across sessions.

Teammates handled the Raspberry Pi server (Node.js/Python, speech-to-text, face recognition) and the ESP8266 relay hardware.

• Kotlin
• Jetpack Compose
• MVVM
• Hilt
• Retrofit
• NanoHTTPD
• Coroutines

• GitHub →