#Joeri Kaiser

Full-stack Engineer

I sit with teams across the company and build the internal software they run on.

• Replaced more than 100 spreadsheets, some over 30,000 rows, that a four-person operations team maintained by hand. The data now lives in an in-app tool that validates every entry, so the rest of the product can use it directly.
• Indexed internal documentation with the customer support leads and built a grounded RAG pipeline for the support chatbot.
• Built an image-processing service that extracts field photo data to generate renovation proposals for technical advisors.
• Currently consolidating several legacy internal tools into one platform, scoped through interviews with the people who use them.

Software Engineer

Built and maintained the staffing platform connecting medical facilities with healthcare professionals across France. Started as an intern and hired full-time a year later. Developed practitioner mobile workflows in React Native, administrative portals in React, and backend matching logic in PHP Symfony backed by PostgreSQL and GraphQL.

Built after researching cycle biology with my partner and finding commercial apps filled with trackers, ads, and opaque predictions. Designed around one rule: physical observations and algorithmic estimates are never presented as the same data. French-first, offline by default, and zero telemetry. An account is a random code with no email or phone number, sync is end-to-end encrypted, and the Go backend can be self-hosted on a VPS or a Raspberry Pi.

F-Droid sync backend

A marketplace for European creatives, artisans, and makers, built solo and now in beta. The hard part was EU law for a multi-seller platform: DSA notices with statements of reasons, DAC7 seller tax reporting, the 14-day right of withdrawal, and explicit trader declarations. Translated into all 24 official EU languages. TanStack Start, PostgreSQL, Meilisearch, Mollie, and Sendcloud.

Rama's privacy-first Android launcher. I've contributed since June 2026, working from community feedback and bug reports: multi-column layouts for wide screens, PWA pinned shortcuts, backup and restore, a recycler-view refactor, Android 17 accessibility, and French translations.

A CLI work ledger in Rust for developers and coding agents. Tasks, bugs, and decisions are Markdown files with YAML front matter in a local vault. Agents claim items on a one-hour lease, write handoffs, and must attach evidence to complete them. Ships a local browser viewer and checksum-verified binaries for Linux, macOS, and Windows.

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.