Open-source contributor
Active member and contributor to Rama, an org building privacy-first, lightweight Android apps. I contribute across their suite of apps.
Joeri Kaiser
Full-stack developer. I build privacy-first Android apps, marketplaces, and terminal tools.
Former bartender; the adaptability stuck, the hours didn't.
experience
Full-stack Developer
Full-stack developer, mostly on internal tooling. Right now that means rebuilding the company's main tool app as one app that merges several older ones. Before that: a RAG pipeline behind the support chatbot, an in-app solution that replaced a heavy Google Sheets dependency, and an AI endpoint that turns plain images into after-work proposals. A good part of the job is sitting down with the team involved, figuring out what they actually need, then building it.
Web Developer
Started as an intern, hired full-time a year later. Built across the stack: React Native for the mobile app, React for the frontend sites, and PHP Symfony with PostgreSQL and GraphQL for the admin panel and backend.
projects
A menstrual cycle tracker built around one rule: what you recorded and what the app calculated are never presented as the same thing. French-first, offline by default, optional end-to-end encrypted sync to a Go backend I also wrote. No Google Play Services, no analytics, no ads. Open-source and available on F-Droid.
A European-centered marketplace for creatives, artisans, and makers, built solo: TanStack Start with SSR, PostgreSQL 16, Meilisearch, Mollie payments, Sendcloud shipping, GDPR-conscious architecture, and Grafana observability.
Rama's privacy-first Android launcher. My contributions include multi-column layouts for wide screens, PWA pinned shortcuts, backup and restore, a recycler-view refactor, Android 17 accessibility, and French translations.
A zero-dependency idea registry for humans and coding agents, written in Rust. Checksum-verified installers for Linux, macOS, and Windows, plus agent integration.
A lightweight database explorer in Rust and egui: schema browser with row estimates, a syntax-highlighted query editor with autocomplete, and CSV, JSON, and XML export for PostgreSQL and MySQL. SQLx on Tokio keeps the UI responsive while heavy queries run.
A terminal task manager in Go, built on Bubble Tea and Lipgloss. Create, edit, complete, and filter tasks, all keyboard-driven.
Also: Jin (kchat), a T3 Chat clone built in ten days and themed after my cat, and fzf-scope, a fish history plugin.
about
I followed family tradition into catering and spent years in hospitality, ending up behind the bar. Coding was always the side thing: WordPress sites for acquaintances, Minecraft plugins, any excuse to boot the PC.
When the pandemic hit I switched for good. Udemy, then a bootcamp, then an internship in 2022 and a full-time offer a year later. Since January 2025 I have been a full-stack developer at Cozynergy, and I contribute to Rama's Android apps on the side.
- confident
- TypeScript, React, PHP Symfony, Kotlin (Android), Go, Rust
- also
- Node.js, Next.js, React Native, Zig, PostgreSQL, GraphQL, Docker, Shell
contact
The quickest way to reach me is email. Otherwise, find me on GitHub or LinkedIn.
Based in France, open to remote. French native, English fluent.