A faster, clearer console, nine-second checkpoint restores, and two early projects to play with.
Lumenrack

Founder letter · July 2026

Less waiting, more seeing

Mara Okonkwo · Co-founder & CEO, Lumenrack

Hi there,

I like infrastructure that gives you fewer reasons to stare at it. This month, we made two parts of the Lumenrack console better: live logs load faster, and the usage and limits area is clearer about what you’re spending and what your plan allows. Less waiting for an answer, less hunting for one.

We also took checkpoint restores on Lumenrack Functions from minutes to seconds. That’s the kind of change I love: the unit on the stopwatch changes, not just the number.

Then Ilse Marchetti, our CTO, took a piece of the Beacon global router and put it in the browser. Her TypeScript project, beaconlite, lets you play with routing and failover rather than just read about them.

I went in the other direction: toward the wires. I started the little rack, a hardware kit for learning cluster networking from the wire up. Four Raspberry Pis and a managed switch make a useful place to ask embarrassingly basic questions. I think those are often the best ones.

Live logs in about a second

The live logs view for Functions deployments used to take five seconds or more to load. Priya Nandakumar’s backend rewrite brings that to about one second. If you tried it before, give it another go.

Try live logs again →

Roughly 26× faster restores

After an overhaul of snapshot storage, the p99 time to restore a warmed vLLM replica from a checkpoint on Lumenrack Functions fell from four minutes to nine seconds.

Explore checkpointing →

A clearer view of usage and limits

The new Overview summarises spend at a glance, with toggles for billing cycle and calendar month. The Limits page lists the resource caps on your plan and links to upgrade. A per-deployment breakdown shows where spikes come from.

See usage and limits →

Beacon in the browser

Ilse built beaconlite, a TypeScript port of a subset of the Beacon global router. It runs client-side with no backend, so interactive technical essays can simulate routing decisions and failover. It’s early, and you can try it today.

Try beaconlite →

The little rack

My reproducible kit uses four Raspberry Pis and a managed switch to make a cluster’s invisible layers visible as it schedules work. The repo is live with a full bill of materials and prebuilt Pi OS images. The first write-up asks: two Pis connected by one Ethernet cable can surely already talk to each other, right?

Meet the little rack →

beaconlite and the little rack are both early projects. Your replies will help shape where they go next. What would you like to try, understand, or break? Hit reply: I’ll answer, or pass your note on to Ilse.

~ Mara at Lumenrack

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