Christoph Rupp
Head of Engineering at EPI, building Wero, a pan-European instant payments platform. Previously, engineering lead at PPRO for seven years. Founder of upscaledb, an open-source embedded database, and co-author of two research papers on SIMD integer compression.
Open Source
Blazingly fast C/C++ embedded database library with analytical functions. Sorted B+Tree, SIMD-accelerated compression, parallel transactions, AES encryption, and language bindings for C++, Java, .NET, Erlang, and Python.
Varbyte/Varint 32-bit and 64-bit integer compression with SIMD (SSE/AVX). Delta compression and operations directly on compressed data.
Frame of Reference 32-bit integer compression. Scalar ANSI C with select, search, lower bound search, and append on compressed data.
Proof of concept MySQL storage engine built on upscaledb.
Personal wiki system for Claude Code. Four slash commands for ingesting sources, querying, creating notes, and linting — the LLM owns the bookkeeping, you own the content.
Sparse compressed bitmap library. Uses 2-bit descriptors to store 2048 bits in as little as 8 bytes under optimal conditions.