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Blog

Things we built,
broke, and learned.

Engineering writeups, postmortems, product notes. We publish unedited postmortems within 14 days of every customer-affecting incident.

FeaturedPostmortem·April 5, 2026

Postmortem: a 14-minute partial outage in eu-fra-1.

A misconfigured BFD multipath timer cascaded into route flapping, which our monitoring saw — late. Here's what happened, why our remediation took 14 minutes instead of two, and what we changed.

MS Mikko Salo · Head of SRE 14 min read
Engineering·Apr 22, 2026

Why we run our own ASN — and what it actually costs.

Operating AS207443 isn't free, but the alternative — leasing transit and pretending it's "anycast" — is more expensive in ways your bill never shows you.

Product·Apr 14, 2026

Per-second billing is a load-bearing feature.

Cloud pricing is unit economics in disguise. The smaller the unit, the more honest the conversation. Here's why we metered everything to the second from day one.

Postmortem·Apr 5, 2026

14 minutes in eu-fra-1: a routing event, told plainly.

A misconfigured BFD multipath timer caused route flapping; our remediation took longer than it should have. Full timeline, root cause, action items.

Engineering·Mar 28, 2026

Building copy-on-write Postgres branches in production.

We rolled our own block-level branching for managed Postgres. Why ZFS wasn't right, why we didn't fork the engine, and how we kept the WAL consistent.

Engineering·Mar 14, 2026

Sub-200ms anycast convergence with BFD and a sane FIB.

When a region goes dark, you want every neighbor to notice fast. We rebuilt our control-plane to make that the default, not the exception.

Company·Mar 1, 2026

Our Series A, and what we will (and won't) do with it.

€18M led by Northzone, with participation from Inovia and OpenOcean. Here's the part of the announcement we don't usually publish: what we said no to.

Product·Feb 19, 2026

What we charge, and why each line is on your invoice.

A walkthrough of the eight line items on a typical Arveon invoice. Each one is explained in a paragraph or less. None of them say "miscellaneous."

Engineering·Feb 6, 2026

4ms cold starts: snapshot warming for V8 isolates.

A spread of small wins compounded into a meaningful p99 improvement. Notes on the process, tooling, and what the upstream patch looked like.

Postmortem·Jan 22, 2026

An object-storage signed-URL clock skew, found in production.

A 200ms NTP drift on edge cache hosts caused intermittent 403s on freshly-signed URLs. The fix was small. Finding it wasn't.

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