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matsur

935 karma · joined January 31, 2011

rusty@lalkaka.com and @lalkaka on twitter.

working on firetiger! rustam@firetiger.com

formerly VP product at cloudflare focused on networking (CDN, IP networking as a service) and analytics products. spire (yc w15) before that.

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matsur··on Inkling: Our Open-Weights Model
Thinky has a potential answer in Tinker — give away the weights and charge for the SFT (and maybe RL down the line) to make the model more capable for specific tasks.
matsur··on San Francisco Weighs PG&E Takeover Amid Soaring Utility Costs
Plot here is quite thick. SF selling power to PG&E to distribute was found illegal/in violation of the Raker Act by the US Supreme Court in 1940 in United States v. City and County of San Francisco.

SF shifted to "wheeling" instead of selling power to PG&E and is tenuously in compliance now, but the current set up was never intended when the federal government ceded water and power rights from Yosemite to SF.

matsur··on Ask HN: Who is hiring? (January 2026)
Firetiger | Product Engineer | San Francisco | Full time, on-site

Firetiger is building self-driving software operations. We believe the future of DevOps isn't better dashboards (like Datadog), but autonomous agents that monitor, investigate, and remediate issues based on high-level business goals. We are backed by Sequoia Capital and founded by Rustam and Achille, former leaders from Cloudflare and Segment.

We are looking for a Product Engineer to build the interfaces between humans and AI agents running software on behalf of those humans. More here: https://jobs.ashbyhq.com/firetiger/f5d4ba4b-29c8-4f77-bae8-8...

matsur··on Claude for Excel
People were saying the same thing about AWS vs SaaS ("AWS wrappers") a decade ago and none of that came to pass. Same will be true here.
matsur··on Show HN: Exponent, A collaborative AI programming agent
I've used it quite a bit/have vibe coded quite a few "real" things with it in various languages. It's a really nice complement to Cursor-style and claude-code style interaction modalities.
matsur··on Cloudflare auto-mitigated world record 3.8 Tbps DDoS attack
The amount of work required to stand up 330 well connected locations and then operate infrastructure to filter traffic at that scale profitably is more than "tossing" cabinets at problems.

This is on the level of BrandonM's famous comment on Dropbox. https://news.ycombinator.com/item?id=9224

matsur··on Show HN: I made a super-simple image CDN
Congrats on the launch. A small nit re: your pricing: you're charging for data transfer (bytes transferred over a long period of time), not bandwidth (bits transmitted at a point in time).
matsur··on Polyfill supply chain attack hits 100K+ sites
Both.
matsur··on Hacker confirms access through infostealer infection [withdrawn]
Very possible there were creds etc accessible in Servicenow that could have been used to move laterally from there. Conjecture, obviously.
matsur··on Timeline of the xz open source attack
eg "Hans Jansen" is <hansjansen162@outlook.com>

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1067708

matsur··on Meta outage
Major outages are periods of intense stress and extremely difficult to operate in. The folks troubleshooting may be many things, but careless and incompetent are unlikely to be among them.
matsur··on Ask HN: Who wants to be hired? (March 2024)
You have no contact info listed!
matsur··on Fluorite lenses: Corrective capabilities beyond ordinary optical glass
"L" has a red ring and everything!
matsur··on Polar bear fur-inspired sweater is thinner than a down jacket – and just as warm
This is the real question. Mountaineers use scales, not calipers, when packing.
matsur··on Three American climbers solve the 'last great problem in the Himalayas'
Sport vs trad grades outdoors are very different animals.
matsur··on Slack is retiring its status account on X
This is not theoretical — Slack had a domain wide outage recently. https://slack.engineering/what-happened-during-slacks-dnssec...
matsur··on Airlines make more money from mileage programs than from flying planes
https://tax.thomsonreuters.com/blog/are-employees-taxed-on-t...
matsur··on How to build a IP geolocation database from scratch?
ICMP response time not useful for “locating” an anycasted address, some of which have logical location associated with them. See https://blog.cloudflare.com/icloud-private-relay/ for an example
matsur··on Ask HN: Suitable database to store web analytics data for million insertion
A lot has changed (grown) in the 5+ years since that was published.
matsur··on Can you buy the same ticket at a lower price if you buy it from another country?
Quoted airfares are required by law to include taxes in the US.
matsur··on Croatia to switch to euro, enter passport-free Schengen zone
You can still ask US passport control for a stamp if you really want one.
matsur··on The UKHO intends to withdraw from paper chart production by 2026
Or use a ziploc bag. Works fine.
matsur··on Cloudflare servers don't own IPs anymore so how do they connect to the internet?
This is a problem in theory. In practice (and through experience) we see very little routing instability in the way you describe.
matsur··on Electric ferry uses a long extension cord [video]
The ferry in the video uses cable based propulsion.
matsur··on Comparing TCP and QUIC
We have some data :) I’ll see if we can get a blog together.
matsur··on Comparing TCP and QUIC
QUIC doesn't imply BBR as congestion control. eg. Our (Cloudflare's) QUIC implementation supports multiple algorithms. https://blog.cloudflare.com/cubic-and-hystart-support-in-qui...
matsur··on Does a reputable VPN service for business use exist?
This is not how any of our VPN or VPN like products behave today. There was a time when this was true for our consumer WARP app
matsur··on NYC Fire Department forcible entry reference guide [pdf] (2006)
Amusing to see “check if the handle opens the door” as an explicit step called out multiple times.
matsur··on Speeding up this site by 50x (2014)
You still have to worry about head-of-line blocking across streams with H2. HTTP3 promises to really really fix these issues.
matsur··on Cloudflare outage on June 21, 2022
We use a phased rollout process for all routine changes (like this one). Once a change has passed peer review and the "dry-run", changes are rolled out to progressively larger slices of our production environment, with monitoring systems and engineers watching for adverse effects.

The specific network locations that were impacted by this change were amongst the last to see the change rolled out. One deficiency in our deployment strategy (which we will correct) is that no network locations in the affected "MCP" configuration received the change early in our rollout process. If that had been the case, we would have found the problem much earlier and the incident's impact would have been much reduced.

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