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Eray Çepni

@erayepni

Junior Kernel Developer at CloudLinux, developing KernelCare security patches and building a Linux network flight recorder.

Turkey

Message

At CloudLinux Software Inc., I developed live kernel patches for KernelCare, enabling security updates without system reboots. I also analyzed CVEs and upstream kernel commits and backported fixes across Linux distributions.

I fixed bugs in the kernel patching module, including CPU vulnerability mitigation coverage gaps and a deadlock under stop_machine. I debugged kernel-level issues with ftrace, crash dumps, gdb, and objdump, and participated in code reviews through Gerrit.

On my Netdiag project, I built a Linux network flight recorder for investigating TCP latency regressions. It uses CO-RE eBPF instrumentation to trace TCP retransmissions and attribute network issues across IPv4 and IPv6 flows.

Experience

Work history, roles, and key accomplishments

Current

Junior Kernel Developer

Current

CloudLinux Software Inc.

Apr 2026 - Present (6 months)

Fixed bugs in the main kernel patching module, including post-patch commit coverage gaps for CPU vulnerabilities mitigation and deadlock under stop_machine. Debugged kernel-level issues using ftrace, crash dumps, gdb, and objdump.

C Linux Kernel KernelCare Debugging Ftrace Crash Analysis GDB Objdump Gerrit Jenkins

C Developer Intern

CloudLinux Software Inc.

Oct 2025 - Apr 2026 (6 months)

Developed live kernel patches for the KernelCare product, enabling security updates without system reboots. Analyzed CVEs and upstream kernel commits, backported security fixes across multiple Linux distributions.

C Linux Kernel KernelCare CVE Backporting Debian Ubuntu RHEL Oracle Linux Ftrace Crash Analysis GDB Objdump Gerrit Jenkins

Long Term Intern

Okuman Medikal Sistemler A.Ş.

Feb 2025 - May 2025 (3 months)

Developed GUI applications for medical devices and data analytics using C++ and the Qt Framework. Designed and implemented medical device management software with C# ASP.NET Core and MS SQL for IoT medical devices.

C++Qt Framework C#ASP.NET Core MSSQL SignalR WebSockets ESP32 BLE WiFi

Graphics Programmer Intern

OtSoftware

Jan 2024 - Apr 2024 (3 months)

Developed Bounding Volume Hierarchies (BVH) to enhance the performance of raycasting and frustum culling, reducing processing time from 4ms to 0.3ms. Applied modern C++ features to enhance performance and code security.

C++BVH Ray Casting Frustum Culling Performance Optimization