Ahmet Abdullah Gültekin

Computer Science Engineer · R&D & Software Architecture

Summary

Software development, for me, is about looking past the code to the architecture, scalability, and operational impact of a system. I am 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/Spring Boot, PostgreSQL for storage, Apache Solr for retrieval, Hazelcast for distributed caching, Fluent Bit → Loki + Grafana for observability, and Docker for delivery. I lead [FIVUCSAS](https://fivucsas.com) — a multi-tenant biometric authentication platform I publish under the [RollingCat Software](https://rollingcatsoftware.com) name — and have shipped real-time 3D physics simulations and computer-vision pipelines in C++.

Experience

Candidate Researcher

Aug 2025 — present

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.
  • Core Java
  • Spring Boot
  • PostgreSQL
  • Apache Solr
  • Hazelcast
  • Fluent Bit
  • Loki
  • Grafana
  • Docker

Software Developer

Aug 2024 — Oct 2024

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.
  • Java
  • JavaFX
  • Google Cloud Platform
  • Vertex AI

Computer Engineering Intern

Jul 2024 — Aug 2024

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).
  • Angular
  • HTML
  • CSS
  • .NET Core
  • Apache JMeter

Selected Projects

FIVUCSAS

fivucsas.com

FIVUCSAS — Face and Identity Verification Using Cloud-based SaaS. Multi-factor biometric auth (face + voice + card + liveness).

  • Biometric Authentication
  • OAuth 2.0
  • OIDC
  • Multi-tenant SaaS
  • Java 21
  • Spring Boot 3

Mizan

High-precision Quranic text analysis engine with letter/word counting and Abjad calculations.

  • Python
  • BM25
  • ISRI stemmer
  • Translation embeddings
  • FastAPI

Muhabbet

Turkey's domestic messaging platform. Privacy-first, KVKK-compliant, Kotlin everywhere.

  • Kotlin
  • Kotlin Multiplatform
  • Ktor
  • Jetpack Compose
  • Compose Multiplatform

Education

Computer Systems Engineering

Feb 2025 — Jun 2025

Instituto Politécnico do Cávado e do Ave · Braga, Portugal — Bachelor's degree (Erasmus+ semester)

Computer Engineering

Sept 2021 — Jun 2026

Marmara University · İstanbul, Türkiye — Bachelor of Science

  • Faculty of Engineering Football Team
  • LÖSEV volunteer

Anatolian high school

Sept 2017 — Jun 2021

İsmail Safa Özler Anadolu Lisesi · İstanbul, Türkiye — High-school diploma

  • School futsal team
  • Chess
  • Darts
  • Volleyball

Skills

Desktop

  • Java
  • JavaFX
  • C#
  • .NET Core

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

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

Selected Certifications

Languages