obiefernandez

I have an open source gem called Raix that builds on top of RubyLLM's abstractions and is quite popular. https://github.com/OlympiaAI/raix

I'm getting Cloudflare protection screens while trying to use claude.ai web app. I wonder if they were getting DDoS'd...

At ZAR once we had pervasive ingestion into an organization-wide knowledge graph in place and working well, the next step was to ditch Linear and replace it with a homegrown experiment tracking system that focuses all product engineers on empirical data and scientific method applied to how we prioritize work.

It's the only way to actually encourage high-agency, high-ownership behavior. Working from a backlog is actively counterproductive!

I’m gonna build this into Ruby on Rails.

I have lots of the code proven out already https://medium.com/zar-engineering/code-mode-mcp-ac17c2a1038...

No. They suck.

My colleague swears by his DHH claude skill https://danieltenner.com/dhh-is-immortal-and-costs-200-m/

I just recreated most of Linear for my company in a few days. Making it hyper specific to what we want (metrics driven, lean startup style).

All state changes are made with MCP so it saved me from having to spend time on any forms and most interactions other than filtering searching sorting etc.

Means we will be ditching Linear soon.

I know I’m an outlier but this sort of thing will get more common.

Love the creativity and that you took the time to explain every step of the discovery.

Anyone else look at this and think to themselves, "thank god"

Like it's probably a good thing for humanity if the USA does not feel the need to go to war with China over Taiwan.

The RLM framing basically turns long-context into an RL problem over what to remember and where to route it: main model context vs Python vs sub-LLMs. That’s a nice instantiation of The Bitter Lesson, but it also means performance is now tightly coupled to whatever reward signal you happen to define in those environments. Do you have any evidence yet that policies learned on DeepDive / Oolong-style tasks transfer to “messy” real workloads (multi-week code refactors, research over evolving corpora, etc.), or are we still in the “per-benchmark policy” regime?

The split between main model tokens and sub-LLM tokens is clever for cost and context rot, but it also hides the true economic story. For many users the cost that matters is total tokens across all calls, not just the controller’s context. Some of your plots celebrate higher “main model token efficiency” while total tokens rise substantially. Do you have scenarios where RLM is strictly more cost-efficient at equal or better quality, or is the current regime basically “pay more total tokens to get around context limits”?

math-python is the most damning data point: same capabilities, but the RLM harness makes models worse and slower. That feels like a warning that “more flexible scaffold” is not automatically a win; you’re introducing an extra layer of indirection that the model has not been optimized for. The claim that RL training over the RLM will fix this is plausible, but also unfalsifiable until you actually show a model that beats a strong plain-tool baseline on math with less wall-clock and tokens.

Oolong and verbatim-copy are more encouraging: the controller treating large inputs as opaque blobs and then using Python + sub-LLMs to scan/aggregate is exactly the kind of pattern humans write by hand in agents today. One thing I’d love to see is a comparison vs a well-engineered non-RL agent baseline that does essentially the same thing but with hand-written heuristics (chunk + batch + regex/SQL/etc.). Right now the RLM looks like a principled way to let the model learn those heuristics, but the post doesn’t really separate “benefit from architecture” vs “benefit from just having more structure/tools than a vanilla single call.”

On safety / robustness: giving the model a persistent Python REPL and arbitrary pip is powerful, but it also dramatically expands the attack surface if this ever runs on untrusted inputs. Are you treating RLM as strictly a research/eval harness, or do you envision this being exposed in production agent systems? If the latter, sandboxing guarantees and resource controls probably matter as much as reward curves.

The beauty of Suno, at least for me, was the opportunity to turn my original lyrics into listenable music free without having it attached in any way to any of the big labels, who are evil to the core. I really hope they keep the existing user experience intact.

Nothing has “killed Ruby on Rails”.

Ridiculous comment.

Location: Mexico City (US Citizen)

Remote: Yes (Remote Only)

Willing to relocate: No

Technologies: Ruby on Rails, AI

Resume/CV: https://www.linkedin.com/in/obiefernandez/

Email: obiefernandez@gmail.com

Hello, I'm one of the original evangelists for Ruby on Rails and the author of The Rails Way as well as Patterns of Application Development Using AI. Over the past three decades, I’ve led teams and built products at every scale — from early-stage startups to global platforms — combining deep technical expertise with a creative, forward-looking approach to software craftsmanship.

I bring 30 years of hands-on engineering experience, including senior leadership in architecture, AI integration, and product strategy. Whether working as an individual contributor or guiding organizations through transformation, I focus on delivering clarity, velocity, and sustainable innovation. My last gig was leading AI strategy related to Developer Experience at Shopify.

Currently evaluating consulting and permanent opportunities with preference for executive leadership position at a larger company, although will consider consulting and fractional CTO type roles for startups and smaller ventures if the project and team are interesting enough.

Big news in the music AI space. Interesting and potentially worrying implications for Suno, which has pulled far ahead in the race and recently announced $150M ARR milestone.

Tobi Luetke at Shopify too

my biggest TIL takeaway from that article was an "oh wow" moment:

The other sound that ‘ȝ’ once spelled is the “harsh” or “guttural” sound made in the back of the mouth, which you hear in Scots loch or German Bach.4 This sound is actually the reason for the most famous bit of English spelling chaos: the sometimes-silent, sometimes-not sequence ‘gh’ that you see in laugh, cough, night, and daughter. Maybe one day I’ll tell you that story too.

Nonstarter if can’t use it with Max plan

Hey if you don't mind updating this, can you please allow the tempo to be as high as 150 bpm?

Self plug: I wrote a whole bestselling book on this exact topic

https://leanpub.com/patterns-of-application-development-usin...

My team at Shopify just open sourced Roast [1] recently. It lets us embed non-deterministic LLM jobs within orchestrated workflows. Essential when trying to automate work on codebases with millions of lines of code.

[1] https://github.com/shopify/roast

Just use Ruby on Rails. Problem solved.

In that case putting NRQL reference into context would work wonders

Just use Ruby on Rails. Problem solved.

Stable mature technology trumps glory.

Mexico is super easy to get residence in especially if you have money and resources.

I almost joined this company about 6 months ago and got an inside look at what they're doing while interviewing. Ended up not joining due to political stuff out of my control and unfortunately can't say much else because NDA. This post by their CEO popped up on my LinkedIn feed today and looks like it might be interesting. I haven't really seen any significant investment going into non-LLM technology mentioned in the news anywhere.

In Mexico I’ve seen a lot of small shops (what we would call “bodegas” in US cities) called Mini-Super. Always gives me a chuckle.

Underrated comment. I was thinking exactly the same thing.

My strategy is to be the guy who wrote the "bible" of integrating LLM code with your normal day-to-day software engineering: Patterns of Application Development Using AI

Amazon: https://www.amazon.com/Patterns-Application-Development-Usin...

Leanpub (ebook only): https://leanpub.com/patterns-of-application-development-usin...

This is actual advice that can be generalized to become an authority in technology related to the phenomenon described by the OP.