Jon Jampen

TypeScriptObsidian Plugin APIGitHub Actionsopen source

An Obsidian plugin that brings Xournal++ handwritten notes and PDF annotations into Obsidian. I wrote it because I wanted handwriting for maths lectures without leaving Linux or my notes vault. It exports .xopp files to PDF whenever they change, creates new notebooks from inside Obsidian, and adds an "edit in Xournal++" action to every embedded PDF.

• 10,000+ downloads and 70+ stars on GitHub.
• I set the roadmap, triage issues and review community pull requests.
• CI/CD with GitHub Actions: tests, formatting, builds and tagged releases.

source plugin page

Next.jsLLMvector DBREST

1st place at the inpeek AI Hackathon, out of five teams in 36 hours. The prototype parses long technical tender documents and drafts structured proposal bids from them. The company has since put it on their roadmap.

SvelteKitMongoDBPythoncronApexCharts

Fitness trackers measure a lot but show little, and older data is hard to get at. So I pulled my own data out. A self-hosted dashboard compares health metrics across days, weeks, months and years.

• Python ingestion jobs that run daily via cron, built by reverse-engineering the vendor's auth flow and endpoints.
• Installable PWA with its own authentication.

Next.jsReactMySQLTailwind

My Matura project: a web app for people with chronic fatigue (ME/CFS, MS, Long COVID) to log their energy after each activity instead of on a paper chart. It plots energy over time and rates activities by their impact based on the last month of entries. Tested with about 15 therapists and as many patients. First written in plain PHP, later rebuilt in Next.js.

fatiguediary.ch source

SvelteKitFirebase Realtime Database

A real-time multiplayer version of my favourite social deduction card game: hackers try to break into a system in four rounds, undercover agents try to stall them or lure them into a honeypot.

play

University of Bern · Databases & Technical Computer Science

Weekly tutorials for 100+ undergraduates on relational design, relational algebra, SQL and digital logic. I also grade assignments and exams.

Client project for Garaio REM AG · Bern

• Rebuilt a service-provisioning system from scratch in Ruby on Rails, PostgreSQL and Tailwind, in shared Docker devcontainers.
• Set up unit, integration and system tests with hundreds of assertions as merge gates for the team.
• GitHub Actions pipelines running security scans, static analysis and headless test suites on every PR.

SvelteKit · WordPress

Custom web apps and sites for clients, including the deployments and hosting behind them.

University of Bern · minors in Data Science, Mathematics, Business Administration

Major GPA 5.94 / 6.0. Coursework includes data structures & algorithms, computer networks & architecture, and databases.