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Security Engineering

Ahmet Semseddin Gultekin

Securing systems from the application layer up to the cloud.

Third-year Computer Engineering student at Sakarya University. I work on network, cloud, and container security, build security tools, and care about clean, dependable engineering.

What I focus on

01

Application security

Finding and fixing vulnerabilities in web applications: authentication, input handling, and secure design.

02

Network & systems

Traffic analysis, hardening, and understanding how systems behave under attack.

03

Cloud & containers

Securing containerised workloads and cloud infrastructure: access control, isolation, and configuration.

Selected work

All projects →

OSINT Research Assistant

A Chrome extension that grades indicators of compromise on the page you are reading: IPs, domains, hashes, defanged input. Pivots through infrastructure, exports findings as STIX 2.1 or a MISP event, and runs entirely client-side against keyless threat feeds.

JavaScriptChrome ExtensionThreat IntelligenceOSINT

Python Hash Cracker

A multi-process, dictionary-based hash cracking tool supporting several algorithms and salt configurations.

PythonMultiprocessingCryptography