Projects

Tools, sites and utilities I design, build and run. Private repositories are marked; ask and I will walk you through the code.

Most of my professional security work was done under NDA — I am not allowed to share, show, or talk about it. What you see here is the subset I can present publicly.

security projects

• Private · code on request

  Security Incident Playbooks

  Interactive incident-response playbooks, investigation checklists and cheat sheets — Linux host forensics, reverse shells, rootkits, SSH key compromise, cron/systemd persistence, lateral movement and AWS IAM incidents.

  • JavaScript
  • Cloudflare Workers
  • Incident Response
  • Forensics
• Live

  Security Notes

  A public security engineering knowledge site with 93 deep dives and 430+ interview model answers, leaning toward incident response and detection: cloud and Kubernetes security, TLS and PKI, networking, forensics, malware and system design. Built from Markdown by a custom static-site generator, with diagrams, a practice mode, search and per-reader progress tracking.

  • Node.js
  • Cloudflare Workers
  • Incident Response
  • Cloud Security
  • TLS / PKI
• Private · code on request

  Security System Designs

  25 security-focused system design documents — DDoS protection, IDS/IPS, PKI and certificate authority, secret manager, MFA, audit logging, rate limiting, API gateway, payments and more.

  • Security Architecture
  • Threat Modelling
  • System Design

ai applications

• Private · code on request

  Job Radar

  AI job-market radar for the Swiss security market: hourly scanning of 40+ employers, LLM fit scoring, certification and skill trend analytics, a Telegram bot, and tailored CVs and cover letters with automatic fact checks — hardened with CSP, geo-restriction, rate limiting and signed sessions.

  • Cloudflare Workers
  • D1
  • R2
  • Queues
  • Gemini
  • Telegram
• Live

  Herkulis

  Training planning for climbing and sports teams on iPhone, iPad, Android and the web: weekly plans, custom exercises and intervals, team management, and load and pain feedback after every session. Data encrypted and hosted in the EU.

  • iOS
  • Android
  • Web
  • Cloudflare Workers
  • D1
  • R2
• Private · code on request

  CV & Cover Letter Generator

  LaTeX CV and cover-letter generator with five layouts, an ATS compatibility scorer and an AI pipeline that tailors documents to a job posting while enforcing factual accuracy.

  • LaTeX
  • Python
  • GitHub Actions
  • Gemini
• Private · code on request

  Oh My Days

  A private, on-device iOS time tracker: active tasks, days since or until important dates, and daily limits for chores with screen-time rewards.

  • Swift 6
  • SwiftUI
  • SwiftData
  • iOS
• Live

  Babicz Photography

  Photography portfolio — a fast, dark-themed static site showcasing my photographic work, available in English and German.

  • HTML/CSS
  • Cloudflare Workers
• Live

  German Learning Platform

  Interactive German grammar learning platform with exercises, user accounts, and an iOS companion app.

  • Astro
  • Cloudflare Workers
  • D1
  • iOS
• Live · Client work

  alexandra-eyer.ch

  Client website — design, build, and deployment.

  • HTML/CSS
  • Cloudflare

open source

• Open source

  Climb Studio

  A local, privacy-first desktop app for frame-accurate climbing video analysis. Mark climb start and end, named checkpoints, and left/right rest, clip and chalk timers on the exact frame, then compare athletes in live charts and export HTML, CSV and PDF reports. No cloud, no uploads: footage and athlete data never leave the machine. Ships as self-updating macOS and Windows installers. Roadmap: use Amazon SageMaker accelerated computing to train models on these frame-accurate labels for more advanced video analysis, opt-in and with the consent of the athletes filmed.

  • Python
  • PySide6 / Qt
  • PyAV
  • ReportLab
  • macOS
  • Windows
  • Amazon SageMaker (roadmap)
• Open source · 2019

  tcpdump-bpf-cheatsheet

  Graphical model of the TCP/IP stack, used as a cheatsheet when developing BPF filters.

  • TCP/IP
  • BPF
  • tcpdump