Desktop
- Java
- JavaFX
- C#
- .NET Core
// hello, world
Ahmet Abdullah Gültekin
Computer Science Engineer in R&D and software architecture, working across distributed systems, backend, mobile, computer 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";
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# about.md
About
I care about what happens past the code: how a system is structured, how it scales, and how it holds up in production. I'm a final-year Computer Engineering student at Marmara University and a Candidate Researcher at TÜBİTAK BİLGEM, and I spent an Erasmus+ semester at IPCA (Braga, Portugal). My backend work is mostly Java and Spring Boot, with PostgreSQL for storage, Apache Solr for search, Hazelcast for distributed caching, a Fluent Bit, Loki, and Grafana observability stack, and Docker for delivery.
I lead FIVUCSAS, a multi-tenant biometric authentication platform I publish under the RollingCat Software name, and I have built real-time 3D physics simulations and computer-vision pipelines in C++. I'm drawn to problems where systems thinking and engineering discipline matter: understand the domain, choose the right tools, ship the smallest version that proves the idea, and improve it with real users.
// skills.yaml
Skills
Languages, frameworks, and platforms I work with. Each orbit groups related tools.
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
Timeline
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
I spent one semester at IPCA in Braga, Portugal, writing OpenGL renderers and OpenCV pipelines in the labs. It was my first experience building software abroad.
Instituto Politécnico do Cávado e do Ave · Braga, Portugal · 2025
// $ gh status
GitHub
A snapshot of my public repositories, pinned work, and recent contributions, refreshed on every build.
Ahmet Abdullah Gültekin
@ahmetabdullahgultekinSenior Computer Engineering student at Marmara University
54 repos 4 followers 5688 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 26.7%
- Java 21.8%
- C++ 18.3%
- Solidity 14.1%
- Python 10.6%
- TypeScript 7.3%
Last fetched: Jun 25, 2026, 6:00 PM. @ahmetabdullahgultekin
// projects/
Projects
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 covering face, voice, document (MRZ), and active liveness, with an embeddable widget that works like reCAPTCHA for biometrics. It is KVKK-compliant and built across several repos: a Spring Boot 3 / Java 21 identity core, a FastAPI ML sidecar, a React 18 web app, and Kotlin Multiplatform clients, on PostgreSQL with pgvector.
- Biometric Authentication
- OAuth 2.0
- OIDC
- Multi-tenant SaaS
- Java 21
- Spring Boot 3
Mizan
FeaturedMizan is a hybrid search and text-analysis engine for the Quran. It runs PostgreSQL full-text search (BM25-style) with an ISRI stemmer over the Arabic, three pgvector embedding paths for cross-language Turkish and English queries, and Abjad calculations verified letter-by-letter against the Tanzil corpus. Every result reports the counting method and model used.
- Python
- FastAPI
- PostgreSQL
- pgvector
- Redis
- Next.js
Share Agent
FeaturedShare Agent is an end-to-end stock analysis and trading platform for BIST Katılım Endeksi (XKTUM), Borsa İstanbul's Islamic-compliance index. It combines technical and fundamental analysis into a weighted signal score (-100 to +100), runs three automated paper-trading agents, and ships a Kotlin Multiplatform mobile app. Live order execution through the Algolab API is implemented but disarmed by default. It runs in production on a Hetzner CX43 server.
- Python
- FastAPI
- PostgreSQL
- TimescaleDB
- Redis
- Kotlin Multiplatform
Muhabbet
FeaturedMuhabbet is a privacy-first messaging app built as a domestic alternative to WhatsApp and Signal for Turkey. It is KVKK-compliant by design and written in Kotlin end-to-end: a Compose Multiplatform client (Android shipping, iOS in progress) and a Kotlin Spring Boot backend. It is an active MVP, not yet released to users.
- Kotlin
- Kotlin Multiplatform
- Compose Multiplatform
- Spring Boot
- PostgreSQL
- Redis
Sarnıç
FeaturedSarnıç is a multi-tenant scheduling platform for Turkish private schools (dershane, özel okul, kurs). It was built to replace a 24-sheet, macro-enabled Excel workbook that managed 143 students, 20 teachers, 27 sections, and 24,444 schedule entries, turning it into a real, collaborative, OWASP-hardened web application.
- Spring Boot
- Java 21
- 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. Focused 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, and a couple of other things are in progress.
- Spring Boot
- Kotlin Multiplatform
- Compose Multiplatform
- React
- Next.js
- FastAPI
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 focused on graphics and systems.
- C++
- OpenGL
- OpenCV
- GLFW
- GLAD
- TypeScript
// contact.md
Contact
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.