Software Engineer & Technical Team Lead focused on cryptography, hardware security modules, secure embedded systems, and applied software architecture.

I design and develop security-oriented software across the stack—from embedded Linux and smart cards to PKCS#11 integrations, cryptographic services, NFC applications, and distributed systems.

• Cryptography and HSMs: PKCS#11, key management, digital signatures, secure key storage
• Smart cards and NFC: Java Card, NDEF, APDU, GlobalPlatform, Ed25519
• Secure embedded systems: Embedded Linux, ARM-based systems, hardware-backed security
• Systems programming: C, C++, Linux, inter-process communication, RPC
• Backend and integration: Java, Python, RESTful services, Apache Thrift, data interchange formats
• Software architecture: Object-oriented and procedural design, technical leadership, cross-team coordination

A compact RFC 3161 Time-Stamp Protocol server written in C.

C RFC 3161 Timestamping Cryptography

A portable C++20 N-of-N XOR secret-sharing library with secure operating-system randomness, CMake support, examples, and tests.

C++20 Cryptography Secret Sharing CMake

A C++ lexer implementation based on finite automata.

C++ Lexer Automata Compiler Fundamentals

An interactive, mouse-controlled Bézier surface application.

C++ Computer Graphics Bézier Surface

A custom WordPress theme developed in PHP.

PHP WordPress Web Development

A Java Card NDEF applet providing Ed25519 key generation and chunked digital signing, including timeout-friendly phased key generation.

Java Card NDEF Ed25519 GlobalPlatform Smart Card

A cross-platform React Native application for reading NFC tags through NDEF on Android and iOS.

React Native JavaScript NFC NDEF Android iOS

An Apache Thrift-based electronic-signature service that exposes PKCS#11 modules over HTTP/JSON to C++, JavaScript, and other clients.

C++ PKCS#11 HSM Apache Thrift OpenSSL CMake

PKCS#11 · HSM · Java Card · NFC · NDEF · Ed25519 · Embedded Linux · Apache Thrift · OpenSSL

On omeryildiz.org, I write about a broad range of topics including software and technology, practical problem-solving, books, travel, art, and personal interests.

The blog brings together technical notes, solutions to problems I encounter, observations from places I visit, reflections on books and art, and other subjects I find useful or worth sharing.

My research and publication interests include:

• Embedded cryptographic devices
• Platform-independent mobile signing with Java Card
• Hardware security modules and secure system design
• Biomedical data classification and decision-tree methods

I hold a B.Sc. and M.Sc. in Computer Engineering and continue my doctoral studies in Computer Science.

• Thales nShield Certified System Engineer
• Spring Framework
• Java API for RESTful Web Services
• Java API for XML-Based Web Services

Building secure, maintainable software where cryptography, hardware, and systems engineering meet.