Roger Kernel

[ Systems / Security / Web ]

Software Engineer focused on Systems and Security

I design and build complex software systems, and understand how they break before others do.

[ 00 / Operating Model ]

I am a software engineer with experience across systems programming, web development, and applied security.

My work ranges from parsers, virtual machines, and terminal tools to production systems, microservices, data pipelines, and security research.

I build software that is functional, understandable, scalable, and resilient.

[ 01 / Project Showcase ]

Showcase

Scroll sideways through selected work. Expand the full index after the carousel.

[ Featured 01 ]MARKET READOUT

TCG Market Terminal (TUI)

Track: DATA / AIStack: Rust with Ratatui, Python with FastAPI, SQLiteReference ↗

A terminal-based system for analyzing trading card markets, including pricing and trends.

Role

Specialized data terminal design.

Focus

Market visibility and operator-speed interaction.

[ Featured 02 ]POSITIONING

Desmodus Landing

Track: BUSINESSStack: Nuxt.js, GSAPReference ↗

Product concept and deployed landing page for a software analysis and security platform.

Role

Product framing and frontend execution.

Focus

Narrative clarity, positioning, and shipping a public surface.

[ Featured 03 ]VECTOR MATCH

RAG Chatbot Engine

Track: DATA / AIStack: Python, TypeScript, vector database concepts

Custom-built retrieval-augmented system for contextual responses.

Role

From-scratch retrieval and serving pipeline.

Focus

Matching logic visibility and sensitive-environment adaptability.

[ Featured 04 ]TELEMETRY LOCK

Fleet Management Platform

Track: BUSINESSStack: Laravel, Vue, Python, MongoDB, REST APIs

B2B system for real-time fleet monitoring and control.

Role

Full-stack product and systems implementation.

Focus

Operations, telemetry flow, and multi-tenant control surfaces.

[ Featured 05 ]MODEL LOOP

Quant Trading Bot

Track: DATA / AIStack: Python, XGBoost, scikit-learnReference ↗

A system that analyzes market data and executes decision-making strategies using ML.

Role

Signal processing and strategy automation.

Focus

Data ingestion, decision loops, and execution logic.

[ Featured 06 ]AST RENDER

Markdown Parser

Track: SYSTEMS / LOW-LEVELStack: C++17Reference ↗

A custom parsing engine implementing tokenizer, AST, and rendering pipeline.

Role

Low-level language tooling from first principles.

Focus

Parsing internals, structure, and rendering flow.

[ Featured 07 ]CORRELATION

Threat Intelligence Graph

Track: SECURITYStack: Python, data processing, graph modelingReference ↗

Automated system for correlating cybersecurity events.

Role

Collection, normalization, and graph modeling.

Focus

Pattern detection, event linkage, and analyst context.

[ Featured 08 ]POSTMORTEM

Writeups

Track: SECURITYStack: Ruby on Rails, JavaScript, documentationReference ↗

Detailed analyses of exploitation processes and system weaknesses.

Role

Technical documentation and research communication.

Focus

Clarity, reproducibility, and depth of explanation.

11 projects in the full index

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[ 02 / Security Case ]

Private Vulnerability Disclosure Program

Remote Code Execution Vulnerability

I traced an input path that crossed a trust boundary, reduced it to a reproducible execution primitive, and packaged the finding in a way that made root cause, impact, and remediation path immediately defensible.

Method

/ Enumerated exposed handlers and mapped where user-controlled data entered execution flow.
/ Reduced the issue to a minimal proof-of-concept so the exploit path was precise, not anecdotal.

Outcome

/ Confirmed the blast radius in a bounded environment and documented realistic attacker impact.
/ Delivered the report through NASA's private program and received public Hall of Fame recognition after disclosure.

Attack surface mapping

Exploit path reduction

Disclosure and recognition

Link to full writeup ↗

[ 03 / Work Approach ]

Build
Break
Harden

ConstructStressVerify

Build

Design the smallest understandable system that can carry the real workload.

Break

Interrogate assumptions, abuse boundaries, and look for failure modes early.

Harden

Document constraints, reduce ambiguity, and leave the system easier to operate.

/ eWPTX Certification

/ NASA VDP Recognition

/ Technical Writeups

/ Active GitHub Projects

[ 04 / Workload Telemetry ]

Agentic Workload Telemetry

0.0MTotal Tokens Processed

[ Claude Code ] [ Codex ] [ ChatGPT ]

AI systems are integrated into my daily engineering workflow across software development, systems research, documentation, and technical exploration. This telemetry represents cumulative interaction across multiple agentic environments and development interfaces.

Provider breakdown of cumulative throughput

Claude Code404.5M

Codex188.3M

ChatGPT104.6M

[ Interaction Profile ]

Interaction Profile

The interfaces through which engineering work is performed.

Read

Edit

Bash

MCP

Relative tool utilization / normalized to peak interface

0.0%

Cache Hit Rate

0.0M

Cached Tokens

0.0M

Fresh Tokens

Total Tokens: 0.0M
Tool Calls: 0.0K
Active Days: 0
Current Streak: 0

[ Availability ]

Currently Open

Taking on work where system behavior, failure modes, and delivery quality matter.

contact@roger.ac

Email GitHub

Freelance projects

Backend and systems roles

Security-related work

SEND THEPROBLEM,
CONSTRAINTS

and the failure mode you care about.

Showcase

TCG Market Terminal (TUI)

Desmodus Landing

RAG Chatbot Engine

Fleet Management Platform

Quant Trading Bot

Markdown Parser

Threat Intelligence Graph

Writeups

Remote Code Execution Vulnerability

BuildBreakHarden

Agentic Workload Telemetry

Interaction Profile

SEND THEPROBLEM, CONSTRAINTS

Build
Break
Harden

SEND THEPROBLEM,
CONSTRAINTS