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Engineering intelligent systems.

S. Gökcen Özden · Software engineer · Security researcher

I build backends and the defences around them, and research how learning systems hold up under attack. From a university platform serving 10,000+ users to federated learning under adversarial pressure, I care about the parts that make systems trustworthy: security, testing and reproducibility.

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Approach

Security is a design decision

A feature is a promise; security is what keeps it. I design backends with the threat model on the table from day one: authentication, encryption and failure modes first, so the system stays trustworthy long after the demo.

Most systems are secured after they ship.

Models learn from data nobody can fully see,

The distance between working and trustworthy

Experience

Four roles, one thread

Backend engineering, security operations and teaching, held together by one habit: building systems that are safe to rely on.

  1. 01 / 04

    2025 — Present

    Backend Developer, Security & Production

    Tokat Gaziosmanpaşa University · AI & Digital Transformation OfficeTokat, TR · Part-time

    Core engineer on DPKS, the university's Digital Programme Guide System. A part-time role I gave full-time commitment, from the backend architecture to the release.

    • Built the backend architecture on ASP.NET Core and PostgreSQL, then took on the design, the front end and the entire student interface.
    • Owned security and cryptography, including post-quantum encryption and passkey sign-in, and built the Güvercin request system.
    • Ran testing and production releases on my own, with a code-first design that plans for what comes next.
    Users served
    10k+

    ASP.NET Core · EF Core · PostgreSQL · Cryptography · Post-quantum cryptography · Passkeys · Security · UX

  2. 02 / 04

    Feb — May 2025

    Cyber Security & Software Instructor

    Necmettin Erbakan Mesleki ve Teknik Anadolu LisesiSivas, TR · Full-time

    Taught IT students in the company's vocational high school programme and contributed to the company's ERP project.

  3. 03 / 04

    2024 — 2025

    Cyber Security Researcher

    Siber Vatan · ALTAY TeamRemote · Internship

    Selected for the ALTAY team after a five-stage examination, and trained as a blue-team analyst in a Security Operations Center programme.

    • Passed a five-stage selection process to join the team.
    • Completed intensive SOC training with the blue-team cyber security unit.
    • Researched current security software and threats, and wrote an article analysing the IDF's attack on Lebanon.

    Python · C · Malware analysis · Wazuh · Linux · Burp Suite

  4. 04 / 04

    Jul — Dec 2023

    Backend Developer

    Novartz BilişimAdana, TR · Internship

    Built ShareRider, a BlaBlaCar-style ride-sharing system, from scratch, from the project design and relational database to cross-platform apps.

    • Designed the relational database and ran the back-end operations.
    • Built cross-platform apps with C#, .NET MAUI and SQL Server, testing thoroughly throughout.
    • Added data encryption and managed session handling to harden security.

    C# · ASP.NET · .NET MAUI · Blazor · SQL Server · Cryptography

Selected work

Ideas that fire, systems that hold

Research, security and backend work, each with the code to back it up.

  1. 01 / 04Research · Under review · 2026
    Researcher

    Fed-MDBSCAN-G

    Stress-testing the defences of federated learning.

    Research code behind my manuscript, now under review, on benign exclusion and consensus-test limits in heterogeneous federated learning. A simulation and audit framework that runs a density-clustering defence against Krum, FLTrust, FLAME and other baselines under attack, with every table and figure reproducible from a fresh clone.

    Simulated training runs
    2,125
    Tables reproduced byte for byte
    21

    Python · PyTorch · scikit-learn · NumPy · SciPy

  2. 02 / 04NLP · Security · 2024
    Solo builder

    Suspicious Chat Detection

    Flagging abusive messages, even when they are misspelled.

    An NLP classifier for hate and offensive speech in chat. Messages are spell-corrected with SymSpell, then scored by a Random Forest over bag-of-words features, served through a small Flask web app.

    Labelled messages
    24.8k

    Python · scikit-learn · NLTK · TensorFlow · Flask

  3. 03 / 04Mobile · Full stack · 2025
    Full-stack developer

    Yeşil Yol

    A community map of accessible places.

    A mobile map of places with ramps, accessible toilets and other accessibility features, shown as custom markers on Google Maps. A Flutter app on a Node.js and Express API backed by PostgreSQL with PostGIS, with accounts and place submissions.

    Flutter · Node.js · Express · PostgreSQL · PostGIS · Google Maps

  4. 04 / 04Backend · 2023
    Backend developer · Novartz

    ShareRider API

    The back end of a BlaBlaCar-style ride-sharing app.

    Users register, publish a journey between two cities and join other people's trips. An ASP.NET Core Web API with JWT authentication, Entity Framework Core on SQL Server, a repository layer, AutoMapper DTOs and Swagger docs. Built during my internship at Novartz Bilişim.

    C# · ASP.NET Core · EF Core · SQL Server · JWT

  5. GitHub

    More on GitHub

    All repositories

Capabilities

A connected toolkit

From the blue team to the back end, the tools I use to build systems and to keep them honest.

  • Security

    Defending systems, and testing how they fail.

    • SOC operations
    • Wazuh
    • Malware analysis
    • Burp Suite
    • Network security
    • Cryptography
    • Post-quantum cryptography
    • Passkeys
    • Linux

  • Backend

    APIs, data and the parts nobody sees.

    • ASP.NET Core
    • Entity Framework
    • Node.js
    • Express
    • Flask
    • PostgreSQL
    • SQL Server
    • MongoDB

  • ML & research

    Models, and experiments anyone can reproduce.

    • PyTorch
    • scikit-learn
    • Federated learning
    • NLP
    • TensorFlow
    • Pandas

  • Languages

    Typed when it matters, fast when it has to be.

    • Python
    • C#
    • C++
    • C
    • JavaScript
    • Dart
    • SQL

Certifications

Currently open to software engineering and cyber security roles,

Open to work

Contact

Let’s build something secure together.

I reply to every message within two working days.

hello@gokcenozden.com

Tokat, Türkiye GMT+3