Building the next generation of CI/CD: @rwx_cloud. Previously built @RootInsurance (IPO) and @braintree ($800M acq)

Joined February 2008
74 Photos and videos
Dan Manges retweeted
Conference alert: The incredible @isaacvando from our team is organizing Software Should Work, an independent conference about software reliability, on July 16-17. ParadeDB is not affiliated, although we are proud sponsors. Speakers include the creators of Zig, SQLite, etc. More info: softwareshould.work/
2
15
678
Is there more to this race than having hot pools?
Vercel Sandboxes are now the fastest sandbox using real VMs as security boundary based on the @computesdk benchmark. The team has been absolutely cooking on this. And the best thing: Because we have a unified Fluid Compute stack across Sandbox, Builds, and Functions these wins are often shared across the stack. On the feature side there is a really exciting roadmap ahead as well. My favorites (all driven by feature requests from our customers): - Persistent sandboxes (in beta, GA immanent) - The fully mutable firewall also becomes fully programmable
5
8
3,943
Dan Manges retweeted
I'm enormously excited that Richard Hipp, the creator and lead maintainer of SQLite, will be speaking at Software Should Work. Join us on July 16-17!
1
3
51
11,082
Dan Manges retweeted
Thrilled to have Andrew Kelley, creator of @ziglang speaking at Software Should Work. Early bird ticket sales end at midnight!
1
2
12
1,691
Dan Manges retweeted
Mar 10
"RWX was built by engineers for engineers, and it shows in how fast and hands-off CI feels day to day." Learn how Tropic migrated from a bloated GitHub Actions workflow to RWX, cutting CI runtimes by 3x while accelerating the path from PR to deployment. rwx.com/customers/tropic
1
5
257
Unreal speaker lineup at this conference. I’m going.
I'm extremely excited that Carson Gross, the creator of @htmx_org is coming to speak at Software Should Work. Just one week left for early bird tickets!
1
1
196
Dan Manges retweeted
Hot take 🔥: AI coding tools are about to make CI a big bottleneck in software development. We saw it before: AI → more code → code review became critical Now: AI → more commits → CI pipelines are collapsing AI coding agents require a new CI system.
We refactored our CI this week from 5 minutes to about 15 seconds on a single bare metal machine. We've been shipping so many PRs that CI time was becoming both a cost center and bottleneck. 1/10th the cost 1/10th the time 100x the PRs
12
4
34
10,008
You can build your own CI (this is impressive) or you can use RWX
Replying to @AJKemps
coming right up but TLDR Cut out all setup overhead (prev 30s, now about 1s) - ovh amd epic turin box with 128 cores and 256gb ram (1k/mo) - golden image of main with all cache loaded - zfs for instant copy of golden image (this is magic) - git fetch all every second for local mirror - golden image of database so only last migration runs (as Postgres template) - turbo cache locally For actual suites - much higher sharding since now no overhead to each shard - use @bunjavascript tests where possible to avoid typescript compilation - incremental typechecking with local cache Bypassing GitHub actions in favor of custom check suites - a few seconds of queue time saved - no action minutes billed (we hit 36k minutes in 3 days) For preview apps - JiT full stack preview apps (not deployed on each commit) - 2-3s cold start on any commit sha to a fully deployed full stack preview app - zfs clone of golden firecracker vm and then check out latest commit etc
1
5
735
“if someone else is always upstream, you can’t really redesign workflows or build anything that defensible”
while they require more capital fully verticalized startups like this are super fascinating to me cuz in the ai era the two things that matter are owning the underlying context & deploying intelligence on top of it. most ai startups do the latter on someone else's platform because it's easier to sell, i.e. you don't have to ask customers to rip out the whole god damn stack. but if someone else is always upstream, you can't really redesign workflows or build anything that defensible. in specific verticals where incumbent software is fragmented enough to allow rip & replace, you'll likely see more companies running the toast playbook which is to own the system of record then make every ai feature a retention mechanism rather than a standalone product.
4
581
Agree that CI as independent doesn’t make sense anymore. That is why RWX is so amazing with agents. Tell the agent to run RWX and when it finally does push the status check will instantly be green due to content-based caching.
I don’t love the UX of worktrees co-located LLM transcripts feel like the feature of the version control system that replaces git. commits & tags are zoom levels for context. I think PRs and CI as this step completely independent from local dev doesn’t make sense anymore
2
1
6
416
When a flaky test fails on RWX, only 1 test needs to rerun instead of the entire shard. If you’re retrying an entire job on a failure, you’re doing it wrong.
An AI agent just shipped a performance optimization to @PostHog's public repo. Not a suggestion. Not a report. A merged pull request that shards Playwright E2E tests into 4 parallel jobs. Before: ~11 min retries. After: ~3 min. Here's what it looks like 👇
1
4
1,440
run `rwx run .rwx/ci.yml` and make sure CI passes and then commit and push
3
279
Dan Manges retweeted
Software Should Work! But usually it's buggy and slow instead. That's why I'm organizing an independent conference on software reliability. Join us for Software Should Work on July 16-17 in Columbia, MO.
5
6
24
6,221
I hate this too. Which is why RWX does not work this way. Retrying any task in the graph while the other tasks keep running is a nice quality of life improvement.
Being unable to retry failed jobs until all jobs complete is my nemesis. I hate it so much.
2
144
30 Dec 2025
Starting to wonder if I'll need to see this GitHub banner for the rest of my life. It's been there for months.
1
1
142
17 Dec 2025
GitHub just shocked engineering team budgets with a change to GitHub Actions pricing. For people using self-hosted runners, or runners provided by a third-party, GitHub previously offered their CI/CD control plane for free. This will no longer be the case. Many people using third-party runners chose that option for the cost advantages, and this changes the equation. For engineering orgs that really want to reduce costs though, there’s a better way. GitHub Actions still uses the traditional approach of running jobs on parallel VMs. However, running pipelines as a graph (DAG), while utilizing automatic, content-based caching, provides the most substantial cost reductions. This approach is the key to how the big tech companies like Google and Meta run their pipelines. We built @rwx_cloud to make this approach accessible for regular engineering teams. RWX runs pipelines faster, and more cost effectively, than any other CI/CD platform. We completed a cost comparison today where a pipeline on RWX used a total of 84,004 seconds of execution, while the identical pipeline on GitHub Actions consumed 300,787 seconds of compute, for a 70% reduction on RWX. If anybody wants to relieve some pressure on their engineering budget in 2026, send me a DM.
2
8
715
17 Dec 2025
"People can easily migrate CI elsewhere" – and there's no better place to migrate to than @rwx_cloud . It's the only platform that runs as a DAG with automatic content-based caching. Engineers love the performance and UX.
16 Dec 2025
Its unfortunate for GitHub - Actions has no real moat, so I'm not sure what they think this move will do for them. People can easily migrate CI elsewhere, and it opens up vectors for folks like Graphite (and continues to for GitLab).
2
1
5
1,668