deutschmark.dev / ~ — Mark Koellmann

deutschmark.

Full-stack developer building streaming infrastructure.

Live · Brooklyn

01About

I'm a full-stack developer who streams. The thing I keep coming back to is the seam between building shippable software and running a Twitch channel — every overlay and companion app I make is one I'd use myself that night.

Most of my work runs on Cloudflare Workers and Next.js static export — cheap to host, fast everywhere, no server tax to keep something free. The Twitch stack is anonymous IRC for chat and EventSub for everything Twitch removed from IRC. Spotify via the Web API. Config hot-swaps to the live overlay over a Durable Object websocket fanout.

I like code that does what the box says in fewer lines than expected, with no half-finished migrations. I don't like dashboards that won't tell you why something broke.

03Selected work

02Stack

TypeScriptReactNext.jsCloudflare WorkersDurable ObjectsCloudflare KVTailwind v4Three.jsWebGLRustSQLitePostgresPrismaSupabaseTwitch IRC + Helix + EventSubSpotify Web API

04Contact

Fastest reach: [email protected]. Also on GitHub and live on Twitch a few nights a week — usually breaking the toolset on stream and fixing it before chat notices.

06Writing

▸ More on toolset.deutschmark.online/docs