Hacker News: juecd

YC, Take Two

juecd — Wed, 01 Oct 2025 15:54:57 +0000

Article URL: https://www.raf.xyz/blog/01-yc-take-two

Comments URL: https://news.ycombinator.com/item?id=45439246

Points: 2

# Comments: 0

Rocketships and Slingshots

juecd — Thu, 04 Sep 2025 21:06:10 +0000

Article URL: https://postround.substack.com/p/rocketships-and-slingshots

Comments URL: https://news.ycombinator.com/item?id=45132183

Points: 43

# Comments: 19

Building a FFmpeg server on top of Chromium for browser replays

juecd — Thu, 21 Aug 2025 16:24:42 +0000

Article URL: https://blog.onkernel.com/p/introducing-browser-session-replays

Comments URL: https://news.ycombinator.com/item?id=44974651

Points: 5

# Comments: 0

New comment by juecd in "Building an MCP Server with Clerk, Vercel, and Mintlify"

juecd — Tue, 22 Jul 2025 22:28:58 +0000

As part of launching our MCP server, we wrote a short blog post about some of our technical decisions and limitations of the current landscape. The space still feels very early, so would love others' thoughts on the MCP space and what else is needed / how you think it'll evolve over time.

Building an MCP Server with Clerk, Vercel, and Mintlify

juecd — Tue, 22 Jul 2025 22:28:58 +0000

Article URL: https://blog.onkernel.com/p/introducing-kernel-mcp-server

Comments URL: https://news.ycombinator.com/item?id=44653734

Points: 1

# Comments: 1

New comment by juecd in "Show HN: Live streaming for CUA models using WebRTC (OSS, Apache 2.0)"

juecd — Wed, 09 Jul 2025 15:49:34 +0000

Thank you! Just saw your GH, will check out your WebRTC work more deeply :)

New comment by juecd in "Show HN: Live streaming for CUA models using WebRTC (OSS, Apache 2.0)"

juecd — Wed, 09 Jul 2025 15:10:51 +0000

Oops, I forgot to add the link: https://github.com/onkernel/kernel-images

Show HN: Live streaming for CUA models using WebRTC (OSS, Apache 2.0)

juecd — Wed, 09 Jul 2025 14:56:05 +0000

Hey HN,

We’ve been building on top of our browser-unikernel repo [0] and wanted to replace the noVNC remote GUI with something much faster. NoVNC is okay but it’s super laggy with any JS-heavy website (basically anything besides Hacker News…). We added remote GUI support using WebRTC, which supports:

- low latency read/write live view into the sandboxed browser (scrolling, clicking, typing feel way more responsive)

- can launch directly as a Docker container or on Unikraft unikernels

- process real-time streams with a fast boot up time (<20ms) if you’re using unikernels

WebRTC is powerful (supports all types of media and data transmission) but not trivial to implement. We adapted the Neko [1] library to play nicely with our base Chromium image. We also tailored the frontend to our use case.

Would love any thoughts/feedback from folks who’ve worked on streaming projects before.

[0] https://news.ycombinator.com/item?id=43705144

[1] Adapted from: https://github.com/m1k1o/neko

* Note: we've started working on adding video replays, so there's some source code for that already in our repo too.

Comments URL: https://news.ycombinator.com/item?id=44510778

Points: 3

# Comments: 3

New comment by juecd in "Show HN: We Put Chromium on a Unikernel (OSS Apache 2.0)"

juecd — Thu, 17 Apr 2025 23:19:45 +0000

The big motivation we had for trying to do this on a unikernel is actually the session pause/resume. The fast cold restart is a nice addition (or put the other way, a super slow restart would prohibit session pause/resume from being useful)

New comment by juecd in "Show HN: We Put Chromium on a Unikernel (OSS Apache 2.0)"

juecd — Thu, 17 Apr 2025 23:16:44 +0000

Yes

New comment by juecd in "Show HN: We Put Chromium on a Unikernel (OSS Apache 2.0)"

juecd — Wed, 16 Apr 2025 20:30:29 +0000

Are you referring to Unikraft Cloud's pricing? I'm not really sure, since I'm not affiliated. Maybe they'll chime in

New comment by juecd in "Show HN: We Put Chromium on a Unikernel (OSS Apache 2.0)"

juecd — Wed, 16 Apr 2025 16:07:13 +0000

Thank you!

New comment by juecd in "Show HN: We Put Chromium on a Unikernel (OSS Apache 2.0)"

juecd — Wed, 16 Apr 2025 15:59:35 +0000

Thank you! Yeah, the current implementation basically performs the same as a Docker container (i.e. not much). The interface is the same, so you can use BU/Playwright/Puppeteer's header configs to change as needed.

We did notice the unikernel cloud instances don't run into bot detection as often as our hosted docker instances, but I think that's mostly because Cloudflare haven't flagged Unikraft Cloud's IPs yet, hah.

New comment by juecd in "Show HN: We Put Chromium on a Unikernel (OSS Apache 2.0)"

juecd — Wed, 16 Apr 2025 15:07:41 +0000

From what we've seen, micro VMs could probably do something very fast too (150ms?) but we thought 20ms was pretty crazy.

New comment by juecd in "Show HN: We Put Chromium on a Unikernel (OSS Apache 2.0)"

juecd — Wed, 16 Apr 2025 14:57:42 +0000

Thank you!

New comment by juecd in "Show HN: We Put Chromium on a Unikernel (OSS Apache 2.0)"

juecd — Wed, 16 Apr 2025 13:29:07 +0000

(OP) Happy to answer any questions! Some things we're still exploring:

- Mounting persistent storage for file i/o

- Replacing noVNC with a faster alternative

Would love feedback, especially if you’ve worked on fast-cold-start systems or unikernel-based infra.

Show HN: We Put Chromium on a Unikernel (OSS Apache 2.0)

juecd — Wed, 16 Apr 2025 13:19:46 +0000

We’ve been building infrastructure to spin up browsers for AI agents. Originally, we built[0] it as a pool of warm Docker containers running Chromium, exposing:

- Chrome DevTools Protocol (for Playwright/Puppeteer)

- noVNC (for live view)

We’ve been following the unikernel space for a while, so we decided to see if we could get our image on one. We went with Unikraft Cloud[1]. Here’s how it did:

- Boot-up time: 10–20ms (vs. ~5s for Docker containers)

- Near 0 CPU/memory consumption when idle

- Still ~8GB RAM when active (headful Chromium)

Potential use cases:

- Standby mode during long-running jobs: unikernels can sleep after X sec of inactivity, reducing clock time costs

- Session reuse: auth/session cookies persist for hours/days. Basically as long as the cookies are valid

- Cold start speed: good for low-latency, event-based handling

We open sourced it with Apache 2.0! Feel free to fork or submit an issue / PR. Open to feedback or suggestions. www.github.com/onkernel/kernel-images

[0] https://github.com/onkernel/kernel-images

[1] https://unikraft.cloud/

[2] Thanks to the Unikraft Cloud team @fhuici @nderjung @razvandeax for helping us figure this out (we're not affiliated)

[3] (OPs) @rgarcia @juecd

Comments URL: https://news.ycombinator.com/item?id=43705144

Points: 132

# Comments: 46

New comment by juecd in "Scale API (S16) helps engineers outsource microtasks"

juecd — Mon, 22 May 2017 23:44:22 +0000

Cool concept - what sorts of tasks are you hoping to do in the future?

New comment by juecd in "Scale (YC S16) Bounding Box API – Image Annotations by Humans via API"

juecd — Tue, 20 Sep 2016 21:33:02 +0000

Your demo is awesome, nice job. Do you guarantee a certain response time?

Also, I'm curious how people use your API if it takes 30 seconds+ to get a response -- ie can I use this for time-sensitive annotations, and also, wouldn't my code hang waiting for your response or do you offer webhooks?

New comment by juecd in "Sway Finance (YC S16) Automates Accounting for SaaS Companies"

juecd — Tue, 16 Aug 2016 05:26:51 +0000

Super good point that we've found with our customers who are migrating from outsourced bookkeepers.

We're using our Slackbot as a friendly way for companies to get their financial data, the idea being that if the numbers are accessible/convenient and ones they want to know (revenue, burn rate, bank balances). Then, we can use the same Slackbot to provide other necessary financial details.

We're still working on this, but we think Gusto does a great job of communicating necessary (and not so exciting) info in a way that engages us.