Suman Karumuri

Engineer. Systems thinker. All things observability. Observability is my ikigai.

[Suman Karumuri @mansu]

So an internal wiki?

[Matthew Berman @MatthewBerman]

Yes. You need a centralized way to host and version skills.

[Suman Karumuri @mansu]

@ngates_ @vortexdotdev Why is datafusion better than duckdb plugin?

[Suman Karumuri @mansu]

@rywible @MarcJBrooker If your storage is keeping up, the lag between WAL and storage engine should be negligible.

In the worst case, the client writes to a WAL and waits for storage to catch up which adds a tiny bit of latency but simplifies so many other things.

[Arun @hiarun02]

Claude Code 4.7 is insane.

i know literally NOTHING about coding. ZERO. and i just built 3 fully functioning web apps in 30 minutes.

http://localhost:3000/
http://localhost:8000/
http://localhost:5000/

check it out.

[Suman Karumuri @mansu]

@signulll It’s more useful to direct your energy towards that.

[kache @yacineMTB]

you can outsource your thinking
but you cannot outsource your understanding

[Suman Karumuri @mansu]

In https://t.co/DTXDYY4UZ4, indexing and serving are separate.

You can rebuild indexes offline without impacting production.

Worst case: slightly stale data.
Best case: the system stays available.

We don’t need faster reindexing. We need architectures where it doesn’t matter.

[Suman Karumuri @mansu]

When it falls behind, you don’t degrade. You break.

In 2026, this shouldn’t be acceptable.

Indexing should be offline, versioned, swappable, and completely decoupled from serving.

[Suman Karumuri @mansu]

GitHub has been down for over a day… because it’s reindexing.

This is a failure mode we’ve normalized.

We built systems where data is written once, indexed elsewhere, and the product depends on that index being perfectly up to date.

[Suman Karumuri @mansu]

@brunoborges Where is the Java memory spent?

[Suman Karumuri @mansu]

@richardartoul This is a very good idea. We used to take down the entire az and rebuild it in our past jobs since regular k8s deploys took too long. Also, made us more resilient to failures.

[Nandkishor @devops_nk]

Honestly, this is the most accurate diagram I've seen.

Waterfall: You plan for 18 months and deliver exactly what nobody needs anymore.

Agile: You deliver something usable at every step, but the CEO keeps asking, "Where's the car?"

AI: You get the car on day one. It has six wheels, the doors are on backwards, and it has a rocket launcher. You spend more time making it yours than actually "building"; it's shaping. owning. verifying. That's what the best AI developers do now. They don't build. They shape and own.

[Suman Karumuri @mansu]

Truly insane hack.

[Basel Ismail @BaselIsmail]

URGENT PSA - New supply chain attack vector that I found WILD > AI LLMs hallucinate package names roughly 18-21% of the time.

Hackers have started pre-registering those hallucinated names on PyPI and npm with malicious payloads; they call it "slopsquatting"

You can only imagine what's next

[Suman Karumuri @mansu]

Went to buy a new pair of shoes at the Nike store. Couldn’t find a single pair that was comfortable. Walked out empty handed. Seems like a very common experience.

[Bryce Roberts @bryce]

Used to buy dozens of pairs of Nikes a year. Can’t remember the last time I’ve bought a pair. Generational fumble.

[Suman Karumuri @mansu]

@breckcs @ThomasAlxDmy Search at large scale is an unsolved problem. Search is broken in pretty much every app I use (Slack, Twitter, Reddit). People complain, but it seems companies don’t really care. It’s baffling.

[Christopher Shay @ChrisBurkeShay]

I don't want to read this entire well written, photographed, and edited piece about journalism's grim AI future that took a ton of work and talent. Grok, can you summarize it for me in 280 characters so I can pretend to have it read it https://t.co/Js8uEErQhN

[Rohan Paul @rohanpaul_ai]

Anthropic's own study proves Vibe-Coding and AI coding assistants harm skill building.

"AI use impairs conceptual understanding, code reading, and debugging abilities, without delivering significant efficiency gains on average"

Developers learning 1 new Python library scored 17% lower on tests when using AI.

Delegating code generation to AI stops you from actually understanding the software.

Using AI did not make the programmers statistically faster at completing tasks.

Participants wasted time writing prompts instead of actually coding.

Scores crashed below 40% when developers let AI write everything.

Developers who only asked AI for simple concepts scored above 65%.

Managers should not pressure engineers to use AI for endless productivity.

Forcing top speed means workers lose the ability to debug systems later.

----

Paper Link – arxiv. org/abs/2601.20245

Paper Title: "How AI Impacts Skill Formation"

[Suman Karumuri @mansu]

100%.

If taxes in WA and CA are the same, moving to CA is a no brainer.

The weather is nicer + better job opportunities.

[Andrea S. James @AndreaSJames]

You'd be surprised how many Seattleites would prefer California, but Washington's tax favorability has allowed it to better compete with its sunnier and more fashionable West Coast cousin. Techies had an economic incentive to learn to love the evergreens and clouds.

Hence, as taxation continues to ramp here, the immediate winners won't necessarily be humid, income-tax-free states, like Texas and Florida, but rather, places like California.

Washington has little parity with California, which has the best weather in the country. I guess up here, the air remains cleaner, so we got that.

In the past two years, we have undergone a major erosion of incentives to stay, to found businesses here, to plant families. So much of the region is transient -- huge influx of people and talent from other places.

It will change. Incentives work. Disincentives also work.

[Sherpa (YC P26) @with_sherpa]

Your website should improve itself.

Sherpa gives you an entire conversion optimization team with one line of code. Here's how 🧵