Software engineer, Istanbul
I'm a backend-leaning junior software engineer in Istanbul. I build products with Java/Spring and Flutter, from the server to the app.
A dating app where two students talk anonymously for seven minutes before either of them sees a face.
A slide-and-merge puzzle about Istanbul's street animals. Version 1.0 went to App Store review in October 2026.
Reads football odds from several sources in real time and flags price combinations whose implied probabilities add up to less than 100%.
Each project, reduced to the path its data takes. The case studies open these paths up step by step.
Sends the message to core-api with its own id (clientMsgId), so a retry can never create a copy.
Stores it once. A second request with the same id is answered from the stored row.
Postgres keeps that one row; the event goes to a Redis channel named after the receiver.
Whichever gateway holds their WebSocket is subscribed to that channel and passes the message on.
Gets the message over the WebSocket. If it is offline, a Firebase notification wakes it.
Builds a candidate board from a seed. The same seed always gives the same board.
Finds the shortest win. The level is kept only if that depth fits its place in a block of ten.
Ships in the game already solved; with the player's consent, playing it sends level_start and level_end.
A daily export turns those events into a level funnel that shows where people get stuck.
The game reads 121 parameters from it, so balance can change without a new release.
A price changes at one source. Depending on the source, it is read over WebSocket, WAMP or HTTP.
One asyncio cycle reads all sources at once, every 30 seconds by default, and stores the batch.
Finds the same match at the other sources: names that agree once normalised, kickoffs at most 3 hours apart.
Adds up the implied probabilities of one price per outcome. Under 100%, the budget is split in whole kuruş.
The PWA lists the match, and users whose threshold it clears get one Telegram message, edited as prices move.
Jul – Sep 2026
Backend work on a production core banking platform in Java and Spring. I extended live services without breaking compatibility, fixed build and dependency issues in a large codebase and wrote multi-table Oracle SQL for analysis and test data.
Aug 2025 – Jan 2026
Cross-platform features with Flutter and Firebase: sign-in, Firestore, push notifications, QR transactions, Google Maps and Iyzico payments.
Jun – Aug 2025
Training in ERP, supply chain and e-commerce. I designed and presented a stock tracking project.
2022 – 2026
Blindy started here as my graduation project.
I'm looking for a junior software engineer role, backend first. Email is the fastest way to reach me.
ozgur.karakayabs@gmail.com
I DJ, and my mixes are on SoundCloud.
The player loads from soundcloud.com only after you press play.
Photos I take around the city.
