Johann Valenteros

A minimalist, experimental personal blog built with Astro. Posts and worldbuilding lore are written as plain Markdown and stitched together Obsidian-style with [[wiki-links]].

• Built with Astro, content authored as Markdown in an Obsidian vault
• Obsidian-style [[wiki-links]] connect posts, characters, and lore
• Broken-link checking wired into the production build

Astro, Markdown, Obsidian, JavaScript

Read the blog · Repository

A Python application for encrypting and decrypting files using industry-standard cryptographic algorithms. A study in cryptographic principles and secure programming.

• Multiple algorithms (AES, RSA) with secure key generation
• File integrity verification via checksums
• Clean CLI and detailed logging / error handling

Python, Cryptography, Security

Repository

A web app for encoding and decoding text across classic ciphers. Originally built with vanilla JS and Tailwind, later rebuilt with React + Vite for a modular, modern stack.

• ROT13, Caesar, Vigenère
• Atbash, Rail Fence, Beaufort
• Real-time character & word count

React, Vite, Tailwind, JavaScript

Repository · with M. Rodriguez

A command-line tool that scores password strength against length, character variety, and common patterns. In collaboration with Michael Rodriguez and grounded in basic security principles.

• Checks length and use of upper / lower / number / symbol
• Returns a strength score and recommendation
• Follows safe password-handling practices

Bash, Security, Command-line

Repository · with M. Rodriguez

A browser-based generator for strong, random passwords. Everything runs client-side; passwords are never sent over the network.

• Adjustable length (8–128) and character sets
• Strength indicator and one-click copy
• Uses the Web Crypto API for secure randomness

HTML, CSS, JavaScript

Repository

One HTML file. No CSS, no JavaScript, no web fonts, no build step. The browser already knows how to render a document, so I let it. Main inspiration: motherfuckingwebsite.com.

• Semantic HTML only; expandable entries use <details>
• Light and dark mode come from the browser via color-scheme
• Fast, accessible, readable in any browser, including text-only ones

HTML

Repository

Our nursing simulation center is basically a small production environment: capture servers, networked manikins, wireless control links, and cable runs spanning the building. I approach it the way a defender approaches any environment: inventory every asset, document every path, assume failure before it happens.

Systems & access

• Administered Panopto AV capture across simulation suites, with roles, permissions, and recording access scoped so sensitive training sessions stay with the people cleared to see them
• Operated Laerdal and Gaumard high-fidelity simulators end to end, from software interfaces to physical hardware, managed like embedded devices: firmware current, wireless links accounted for, unusual behaviors documented and baselined

Electrical soldering & simulator hardware

• Performed practical electrical soldering work involving battery leads, wiring connections, small components, and hardware repairs, with attention to clean joints, secure connections, polarity, insulation, and safe handling
• Assisted with manikin installations and simulator hardware setup, connecting internal electronics, cables, sensors, power systems, and peripheral components while troubleshooting physical hardware issues as they came up
• Applied hands-on electrical troubleshooting skills across simulator and training equipment, including checking connections, identifying loose wiring, documenting unusual hardware behavior, and supporting reliable day-to-day operation

Infrastructure & physical layer

• Racked, cabled, and serviced rack servers and AV infrastructure
• Traced and verified wiring across separate buildings with toner-and-probe kits and cable sniffers, confirming every drop terminates and mapping the runs that were never written down
• Practical electrical systems work: documenting, illustrating, and isolating faults

Documentation & troubleshooting

• Wrote troubleshooting documentation, from manikin SOPs to software quickstarts and recovery guides

Panopto, Laerdal, Gaumard, Rack Servers, Cable Tracing, Electrical Systems, SOPs & Runbooks, Troubleshooting