Desktop
- Java
- JavaFX
- C#
- .NET Core
// hello, world
Ahmet Abdullah Gültekin
Polyglot engineer across backend, distributed systems, mobile, vision, and biometric ML — Candidate Researcher at TÜBİTAK BİLGEM.
- // java String name = "Ahmet Abdullah Gültekin";
- // kotlin val name = "Ahmet Abdullah Gültekin"
- // typescript const name: string = "Ahmet Abdullah Gültekin";
- // python name: str = "Ahmet Abdullah Gültekin"
- // solidity string public name = "Ahmet Abdullah Gültekin";
▊ Scroll to continue
# about.md
Manifesto
Software development, for me, is about looking past the code to the architecture, scalability, and operational impact of a system. I'm a final-year Computer Engineering student at Marmara University and a Candidate Researcher at TÜBİTAK BİLGEM, with an Erasmus+ semester at IPCA (Braga, Portugal). My backend work leans on Java and Spring Boot — PostgreSQL for storage, Apache Solr for retrieval, Hazelcast for distributed caching, Fluent Bit and Loki (with Grafana dashboards) for observability, Docker for delivery.
I lead FIVUCSAS, a multi-tenant biometric authentication platform that I publish under the RollingCat Software umbrella name, and I have shipped real-time 3D physics simulations and computer-vision pipelines in C++. The throughline is taste for problems where systems thinking and engineering rigor meet: understand the domain, pick the right tools, ship the smallest thing that proves the idea, iterate with real users.
// skills.yaml
Stack Atlas
Languages, frameworks, and platforms I use to ship. Orbits group related tooling.
Loading the galaxy…
Mobile
- Kotlin
- Jetpack Compose
Web
- TypeScript
- JavaScript
- Angular
- React
- Spring Boot
- FastAPI
- JSP & Servlets
- JSF
- HTML
- CSS
Blockchain
- Solidity
- Smart Contracts
Embedded
- C
- ARM Assembly
- Socket Programming
Machine Learning
- Python
- Data Mining
- MATLAB
- AnyLogic
Computer Vision
- C++
- OpenCV
3D Programming
- OpenGL
Data & Search
- PostgreSQL
- Apache Solr
- Hazelcast
- pgvector
- Microsoft SQL Server
- Redis
Systems & Platforms
- Git
- Linux
- Docker
- Traefik
- Fluent Bit
- Loki
- Grafana
- Software Design
- Software Documentation
- Doxygen
- Apache JMeter
- GCP
- AWS
- Firebase
$ git log --oneline
Commit Log
My education and work history, written as commits.
Work
-
Candidate Researcher
TÜBİTAK BİLGEM · Gebze, Kocaeli, Türkiye
- Contribute to research-grade backend systems with a focus on performance, observability, and distributed-systems primitives.
- Work on Java + Spring Boot services backed by PostgreSQL, with Apache Solr for retrieval and Hazelcast for distributed caching.
- Operate the Fluent Bit → Loki log pipeline with Grafana dashboards, and produce technical documentation for internal teams.
-
Software Developer
4US GAME OYUN, YAZILIM VE PAZARLAMA A.Ş. · İstanbul, Türkiye
- Developed the desktop application "AI Project Analyzer" using Java, JavaFX, GCP, and Vertex AI.
- Collaborated with cross-functional teams to optimize application performance and enhance user experience.
-
Computer Engineering Intern
4US GAME OYUN, YAZILIM VE PAZARLAMA A.Ş. · İstanbul, Türkiye
- Built the entire front-end of 4US GameHub using Angular and HTML/CSS.
- Contributed to back-end development with .NET Core and performed load testing using Apache JMeter.
- Implemented bug fixes and improved the payment screen on the Byco website.
- Assisted in transitioning an existing JavaScript project to an Angular-based framework (Octa Health Hub).
- commit
dfced72Author: ahmetgultekin <ahmetabdullahgultekin@gmail.com>
Candidate Researcher
TÜBİTAK BİLGEM · Gebze, Kocaeli, Türkiye
- Contribute to research-grade backend systems with a focus on performance, observability, and distributed-systems primitives.
- Work on Java + Spring Boot services backed by PostgreSQL, with Apache Solr for retrieval and Hazelcast for distributed caching.
- Operate the Fluent Bit → Loki log pipeline with Grafana dashboards, and produce technical documentation for internal teams.
- commit
ddea6a8Author: ahmetgultekin <ahmetabdullahgultekin@gmail.com>
Software Developer
4US GAME OYUN, YAZILIM VE PAZARLAMA A.Ş. · İstanbul, Türkiye
- Developed the desktop application "AI Project Analyzer" using Java, JavaFX, GCP, and Vertex AI.
- Collaborated with cross-functional teams to optimize application performance and enhance user experience.
- commit
ddea6a8Author: ahmetgultekin <ahmetabdullahgultekin@gmail.com>
Computer Engineering Intern
4US GAME OYUN, YAZILIM VE PAZARLAMA A.Ş. · İstanbul, Türkiye
- Built the entire front-end of 4US GameHub using Angular and HTML/CSS.
- Contributed to back-end development with .NET Core and performed load testing using Apache JMeter.
- Implemented bug fixes and improved the payment screen on the Byco website.
- Assisted in transitioning an existing JavaScript project to an Angular-based framework (Octa Health Hub).
Education
-
Computer Systems Engineering
Instituto Politécnico do Cávado e do Ave · Braga, Portugal
- Bachelor's degree (Erasmus+ semester)
-
Computer Engineering
Marmara University · İstanbul, Türkiye
- Bachelor of Science
- Faculty of Engineering Football Team
- LÖSEV volunteer
-
Anatolian high school
İsmail Safa Özler Anadolu Lisesi · İstanbul, Türkiye
- High-school diploma
- School futsal team
- Chess
- Darts
- Volleyball
- commit
75ab8fdAuthor: ahmetgultekin <ahmetabdullahgultekin@gmail.com>
Computer Systems Engineering
Instituto Politécnico do Cávado e do Ave · Braga, Portugal
- Bachelor's degree (Erasmus+ semester)
- commit
99317c4Author: ahmetgultekin <ahmetabdullahgultekin@gmail.com>
Computer Engineering
Marmara University · İstanbul, Türkiye
- Bachelor of Science
- Faculty of Engineering Football Team
- LÖSEV volunteer
- commit
ce9524bAuthor: ahmetgultekin <ahmetabdullahgultekin@gmail.com>
Anatolian high school
İsmail Safa Özler Anadolu Lisesi · İstanbul, Türkiye
- High-school diploma
- School futsal team
- Chess
- Darts
- Volleyball
// chapter: 2025
Erasmus+ in Braga
İstanbul → Braga, Portugal
For one semester at IPCA in Braga, I swapped the Bosphorus for the Cávado valley — writing OpenGL renderers and OpenCV pipelines in labs by day, walking past azulejo-tiled façades by evening. Shipping software in a foreign language made the stack feel smaller and the craft feel bigger.
Instituto Politécnico do Cávado e do Ave · Braga, Portugal · 2025
// $ gh status
GitHub
A frozen snapshot of public repos, pinned work, and contribution rhythm — refreshed at every build.
Ahmet Abdullah Gültekin
@ahmetabdullahgultekinSenior Computer Engineering student at Marmara University
53 repos 4 followers 4394 contributions in the last year
Less More
Pinned repositories
-
Computer Vision Project that provides coin counting by OpenCV library in C++
C++ - BilliardShow0 0
A hands-on 3D graphics application built with modern OpenGL and C++. This project demonstrates real-time rendering, camera control, interactive object manipulation, and model loading using GLFW and GLAD. Designed for learning and experimenting with essential 3D programming concepts and techniques.
C++ -
Nucleo-L476RG Embedded System Projects
C -
Lottery Puchasing Platform - Solidity - Blockchain - dApp
Solidity - Muhabbet0 0
Turkey's domestic messaging platform. Privacy-first, KVKK-compliant, Kotlin everywhere.
Kotlin - Trainvoc0 0
Trainvoc - Vocabulary training app (Backend, Mobile, Web)
Kotlin
Top languages
- Kotlin 26.4%
- Java 21.6%
- C++ 18.2%
- Solidity 14%
- Python 9.6%
- TypeScript 7.2%
Last fetched: Jun 5, 2026, 7:56 AM. @ahmetabdullahgultekin
// projects/
The Archive
Selected work. Open-source where possible; links point to the live site or the repo.
FIVUCSAS
FeaturedFIVUCSAS — Face and Identity Verification Using Cloud-based SaaS — is a privacy-first, self-hosted, multi-tenant biometric authentication platform (face, voice, MRZ, active liveness) with an embeddable widget — think reCAPTCHA, for biometrics. KVKK-compliant, WebAuthn-first, multi-repo (Spring Boot 3 / Java 21 + FastAPI ML sidecar + React 18 + Kotlin Multiplatform clients) on PostgreSQL 16 + pgvector.
- Biometric Authentication
- OAuth 2.0
- OIDC
- Multi-tenant SaaS
- Java 21
- Spring Boot 3
Mizan
FeaturedMizan is a hybrid search + text-analysis engine for the Quran — BM25 over the Arabic with ISRI stemming, cross-language translation embeddings, and Abjad calculations verified letter-by-letter against the Tanzil corpus. 172 tests passing, reproducible methodology metadata on every result.
- Python
- BM25
- ISRI stemmer
- Translation embeddings
- FastAPI
Share Agent
FeaturedShare Agent is an end-to-end stock analysis and automated trading platform for BIST Katılım Endeksi (XKTUM) — Borsa İstanbul's Islamic-compliance index. It combines technical and fundamental analysis with a weighted signal scoring system (-100 to +100), automated paper/live trading, and a cross-platform mobile app — running in production on a Hetzner CX43 server.
- Python
- FastAPI
- PostgreSQL
- Redis
- Kotlin Multiplatform
- Compose Multiplatform
Muhabbet
FeaturedMuhabbet is a privacy-first messaging platform built as a domestic alternative to WhatsApp/Signal for Turkey. KVKK-compliant by design, Kotlin everywhere — Android, iOS, and backend.
- Kotlin
- Kotlin Multiplatform
- Ktor
- Jetpack Compose
- Compose Multiplatform
Sarnıç
FeaturedSarnıç is a multi-tenant scheduling platform for Turkish private schools (dershane / özel okul / kurs). Born from the need to replace a 24-sheet, macro-enabled Excel workbook managing 143 students, 20 teachers, 27 sections, and 24,444 schedule entries — and turn it into a real, collaborative, OWASP-hardened web application.
- Spring Boot
- Kotlin
- PostgreSQL
- Timefold Solver
- React
- TypeScript
AI Project Analyzer
FeaturedA JavaFX desktop tool that uses Vertex AI on Google Cloud to analyze project artifacts and surface insights. Focus on application performance and a tight UX.
- Java
- JavaFX
- Google Cloud Platform
- Vertex AI
RollingCat Software
RollingCat Software is an umbrella name I publish some of my work under — not a company, just a brand. FIVUCSAS lives under it; a couple of other things are in flight.
- Spring Boot
- Kotlin Multiplatform
- React
- FastAPI
- PostgreSQL
- pgvector
Erasmus+ at IPCA Portugal
A combined card for the four IPCA Erasmus+ coursework projects of Spring 2025 — BilliardShow (OpenGL/C++), VirtualMoneyCounter (OpenCV/C++), Nayborly (web), and PracticalWork (advanced data structures). Coursework, not flagship — but the semester where I doubled down on graphics and systems.
- C++
- OpenGL
- OpenCV
- GLFW
- GLAD
- TypeScript
// contact.md
Signal
The best way to reach me is email. I usually reply within a day.
- Based in
- İstanbul, Türkiye
Open to internships, contract work, and collaboration.