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koliber

4,613 karma · joined April 11, 2013

I run an high-touch outsourcing company that finds exceptional engineering talent for American and Canadian companies in Europe ( http://vistulo.com/ ).

I also help engineering leaders at early-stage startups solve their people and technology scaling challenges ( http://koliber.com/ ).

If you ever want to chat or are curious about something, drop a line at yc@koliber.com or hn@vistulo.com.

Previously, I ran the engineering department at Career Karma (YC W19) as the VP of Engineering. Prior to that, I was at 15Five, where I helped grow the engineering team to 50+ and built the technology foundation that allowed the company to flourish. I started my professional career during the 1999 dotcom boom, and since then worked in SaaS, finance, and aerospace supply chain firms.

[ my public key: https://keybase.io/krystian; my proof: https://keybase.io/krystian/sigs/JRc2bCWHJVa-mzt-W8tCDzKIYPPnQyPqfqJdO5RBVfc ]

LinkedIn: https://www.linkedin.com/in/krystianc/

Email: yc@koliber.com or k@vistulo.com

submissionscomments
koliber··on Solving the 1+N Query Problem
I really like how you phrase this and completely agree. Issues should be caught as early as possible in the dev process and what you describe is probably as good as it gets. I tend to look at such problems from an organizational perspective and a good APM is a fail safe that compensates for other failures.
koliber··on A new ceiling for Λ: the de Bruijn–Newman constant
He posted it. That’s some of the work you question. Presumably he queried the AI and led it in some way. That’s also work.

As far as the exact breakdown we will never know. But questioning the authorship in a way that leads us to believe that the author did nothing is wrong.

koliber··on A new ceiling for Λ: the de Bruijn–Newman constant
In the new world of AI, capable QA will rule the world.
koliber··on Anthropic expected to tell investors it sees over $30T in potential revenue
I also already told my potential investors that I see $30T in potential revenue. Talk is cheap.
koliber··on How much of HN is AI?
I have a comment here from a few years ago where I am accused of it being generated by AI. I wear it like a badge of honor because I wrote it 100% by hand.
koliber··on Solving the 1+N Query Problem
This is largely a solved problem. New generations of programmers are simply rediscovering it.

The solution:

- be aware of it

- add DB query monitoring via your favorite APM tool

- review the APM tool regularly

- when you see an N+1 issue apply one of the normal solutions.

Follow this and N+1 query issues will disappear soon enough.

If you can’t do this it means you chose an immature framework or tech stack and my advice is to consider starting from scratch. Otherwise you will need to re-live the mistakes many people have already solved before you which feels adventurous but is painful and dumb.

koliber··on Bomb fishing is wreaking havoc on Indonesia's coral reefs
Bomb fishing is bad. I am surprised that only 3 football field equivalent areas are destroyed per year in a country as vast as Indonesia.

I hate the idea but this article makes me optimistic that other proactive measures that are not mentioned might be restoring a lot more than this.

Read critically.

koliber··on Apple introduces M6 and M5 Ultra
You’re right but that is not the point. The point t is that soon after the whole category of portable MP3 players got wiped out by smart phones.
koliber··on 4 in 10 travellers visit tourist sites to capture social media content
If I read the stats in the original article correctly, you and I are in the 1/5th of the population that feels this way about it.
koliber··on 4 in 10 travellers visit tourist sites to capture social media content
National Geographic and BBC would send photographers to a place for the sole purpose of taking a photo. Regular people did not do that.
koliber··on 4 in 10 travellers visit tourist sites to capture social media content
People take photos for multiple reasons.

I like the memories. I enjoy looking through a photo album many years down the line and reminiscing about a great trip.

People take photos to brag.

People take photos to prove to non-believers that something happened.

People take photos to capture beauty.

People used to take photos and people continue to take photos. I suspect the reason has changed.

koliber··on Felony Bench
I can see it now. Billboards by the interstate: Attacked by AI? Call 1-800-BIG-BUXX.

I could actually root for this law firm. Their business will only grow.

koliber··on Being ambitious and being a dad
I found that the time they spend with me, their dad, observing and learning how I do things, impacts them positively.

I don't know if they need it or not, but I do see that they benefit from it. And it feels good too.

koliber··on Being ambitious and being a dad
> can choose to avoid seeing their children if they want to

The choice is there. It's sad how many people choose to not spend time with kids. But the fact that more people have this choice now than they did in the past makes me conclude that it is not as bleak.

koliber··on Being ambitious and being a dad
He forgot to talk about hobbies :)

I had a conversation about this topic yesterday with a colleague of mine. We both found some kind of career-family balance, and are continually honing it. However, we both lamented the loss of hobbies.

koliber··on Being ambitious and being a dad
I don't know if progress made it more hard to spend time with kids, on average.

In older generations, men spent relatively little time with little kids. I don't know if it was social convention or lack of time. Either way, it seems that now a lot more dads are spending time with kids than 2 generations earlier.

I agree that it is hard, but I would not paint a bleak picture.

koliber··on Ask HN: I've quit six systems for tracking my illness. What works?
I don't know anything about tracking your particular illness, but I have tried tracking various things in my life with varying success. Many times I've failed, but then I tried again in different ways. One thing that I noticed is that too often I would try to track too much too rigorously. It would become a burden, I would lose motivation, and I would stop.

For some things, I decided to find a way to do the minimum amount of tracking that is sustainable. One example is fitness. I tried keeping a detailed track of the kinds of exercise I do. I realized it is too much of a burden. So instead, I opted for just noting in my journal whether I did any exercise at all. And it worked. And I realized that I have capacity for more so I started marking whether I did too little, just enough, or a lot. And that was sustainable. And then I built it up some more and for one particular type of exercise, and now I track it thoroughly, while only noting the others. This is now a habit and it seems to have stuck.

So instead of starting with a thorough way of tracking something, start with a minimal way of noting and build up from there.

koliber··on Exercise intensity modulates interorgan communication and is associated with
Most people don't exercise at all. If some of these people draw the wrong conclusion from such a study and start exercising at high intensity, it will still be better than their current couch-potato training protocol.
koliber··on We Tracked a Shipment of Rare Books. It Ended at an Amazon AI Training Facility
I watched Short Circuit yesterday. All I can think now is "need input".
koliber··on Panic of 1873
Quoting the article:

> A boom in railroad construction, 33,000 miles (53,000 km) of track were laid across the country between 1868 and 1873.

> The railroad industry was the largest employer outside of agriculture and involved large amounts of money and risk. A large infusion of cash from speculators caused spectacular growth in the industry and in the construction of docks, factories, and ancillary facilities. Most capital was involved in projects offering no immediate or early returns.

Sounds like the AI bubble.

koliber··on Melatonin impairs morning cognition in healthy young adults (2023)
I feel that the 1mg pill bottle that I have already is my lifetime supply, given the rate at which I use it.
koliber··on Protopia
Appreciate your thoughts. I think if we sat down and talked we would agree on a lot of things.

re: end goals: in most cases, you still need an end goal in mind in order to craft a process that will get you there. In the end, it is the process that matters and the goal is there only for measuring progress and adjusting course. However, a single process for a single goal is not enough in a dynamic changing world. You need a way of being able to react and adjust or even drastically change the process.

re: habits. Again, fully agree given a static goal. But if the circumstances change, the existing habits might no longer serve you. You need to be able to adjust habits.

re: hyper-rational. This is my style. I find that I can think, explain, and execute mechanically more effectively. It's practical. Deep down, there is a philosophy behind this, but I have a hard time explaining and applying philosophy.

koliber··on Protopia
I’ve been mulling a congruent idea.

When we think about goals we usually imagine a static end state. 75 kg body weight. 1,000,000 USD in my bank account. A happy life.

We try to define the goals using units and aim for them. This is fine in most cases.

It’s a way of thinking that is based around a static goal. But life is dynamic.

More recently I started thinking of having dynamic goals. Instead of a body weight goal, I will focus on a goal of building mechanisms that allow me to change my weight. If I lose a leg in the future and can’t run and my weight is 74 kg I did not hit my goal. If I develop different ways of limiting caloric input and different exercise routines that allow me to burn calories in different circumstances, I will be better prepared for whatever the future may bring.

I think it can be summed up as this: My goals will be based on building agile methods for adjusting course in a desirable direction, as needed.

Not sure if this is clear or how to call it. 2nd order goals? Dynamic goals?

koliber··on Melatonin impairs morning cognition in healthy young adults (2023)
I read a while back that our brains produce roughly 0.3 mg of melatonin when signaling us to go to sleep. When I occasionally do use melatonin I split a 1mg pill into half or thirds. I find that it works well enough to help me fall asleep. Wondering how the study would look if hwy used 1/2 mg doses.
koliber··on Book prizes don't work how you think
In theory, you're right. But she talks about how it happens in practice. We can all sit around and talk about how this or that should work in theory, until one day we get a chance to do that one thing. And then most of us shut up because the real world is messy.

> What if they have much worse paragraphs in the middle?

Do you think a book that has a particularly bad first few pages is more or less likely to have a lot of poor content in the middle vs. a book that has a really good first few pages?

koliber··on Book prizes don't work how you think
When you are judging something you are judging the whole thing. If the first part is bad that puts the book behind every other book. Even if the rest was decent the chance of it being the best overall is small.

Think about judging a 3 course meal. If the appetizer is bad, what is the chance that you will rate this meal as the best even if the main course and dessert were very good? If you are eating at restaurants that are supposedly great, the chance is tiny.

koliber··on Ask HN: Who is hiring? (July 2026)
Vistulo | Sr. Java Backend / Sr. React Frontend / Sr. Network Engineer / Sr. Cloud Infrastructure Engineer | REMOTE, must be based in Poland or Romania | $110k-$160k / year

All roles are for a large N. American bank working on or adjacent to trading systems for various asset classes (equities, FX, fixed income, commodities).

Looking for top-notch senior+ engineers. Must be a great engineer who understands their craft in-depth. Prefer people who strive to understand the business domain and don't merely follow verbatim Jira stories. Some roles require capital markets experience (details in job posts below). Long term engagements. 100% remote, but only for people based out of Poland or Romania.

Details at https://vistulo.com/roles/hn0607/ . Apply via link in job post. If you know someone who could be great for the role, referrals are welcome (see details in ad).

koliber··on After 12 years of being a customer, Uber is dumping PagerDuty
It would be relatively easy to build the logic for on-call rotations, and to build the API endpoints for consuming alerts. But add to that the work of also building mobile apps, working with SMS and email infra, and this becomes a non-trivial effort. For a company like Uber it might make sense to dedicate a tiny team to build an in-house solution. For small startup, it still is not worth the hassle to maintain a service like this in house.

Bonus question - how do you alert your team that your home-build PageDuty went down?

koliber··on Ask HN: Where is the programming profession going?
I was trying to make a different statement. Everyone will need to become a manager, even ICs. But in the past, many engineers shied away from management, for various reasons. Now, it will need to change.

Managing people is hard because of all the things that make us human. Managing AI will be simpler as we won't need to deal with some of those things.

Separately,

> "By using AI we get all the benefits of workers but with none of the drawbacks of humans."

To be fair, I did not write that. You are projecting your thoughts on my post.

koliber··on Fintech Engineering Handbook
Anyone know of resources like this but for capital markets? Things that would allow engineers new to trading equities, options, FX, bonds, and commodities to learn about different flows, market structure, common architectures, and other things that normally you learn from years of experience.
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