Projects
More projects are on my GitHub profile. Also available as a PDF résumé (download).
Multi-Tenant Rate Limiting – backpressure
Rate limiting for Temporal workflows and other async workers that share rate-limited APIs. Before each call to an upstream API, a worker asks a shared Valkey gate for a permit, and the gate enforces a global cap, three priority classes, and a fair share between the tenants competing for it. The Python and Go packages share the same keyspace, so mixed fleets coordinate, and a plugin wires it into Temporal workers. To test it I also built mocklimit, a mock API server with realistic rate limits.
Check out backpressure on GitHub · mocklimit
Google Summer of Code – P4 Language Consortium
Load balancing for Kubernetes, done in the network switch. I built a CNI plugin that programs a P4 switch (BMv2) so traffic keeps reaching a pod while it migrates live to another node. Then I ported it to a real Intel Tofino 2 switch at TU Berlin's INET lab: a P4 program with connection-consistent hashing, a small control plane for migrations, and 20 live migrations in a row without dropping a single TCP connection.
Check out p4containerflow on GitHub · the Tofino 2 port
Portfolio Website – kosorin.com
You're looking at it! I first built this website in 2023 with React, Next.js and Tailwind CSS, statically exported and hosted on GitHub Pages, in four languages. In 2026 I replaced all of that with a handful of hand-written HTML pages and one small stylesheet: no JavaScript, no frameworks, no build step. Every page also has a Markdown copy for LLMs.
Check out the repository on GitHub · See the old Next.js version
Rust Microservice Code Generator – TU Berlin
Crustagen generates a ready-to-run Rust microservice from an AsyncAPI spec: the code, its dependencies and the docs.
Check out the repository on GitHub
Slovak Language Learning App – LearnSlovak.sk
Duolingo doesn't teach Slovak, so I built an app for my girlfriend to learn it: lessons and a practice mode, with a Next.js frontend and a Go backend.