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tanvach

581 karma · joined February 7, 2012

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tanvach··on Sharpie found a way to make pens more cheaply by manufacturing them in the U.S.
Many moons ago, we looked into doing molds for injection molding in US and China for a simple plastic part. The US based companies quoted 10x more expensive, while the Chinese company we ended up with offered more features (over molding with TPU) at cheaper initial and unit prices, and really great customer service walking through optimizing the part design with us. We were very happy with them. It made it possible to get our product to be economical.

Might be worth doing a test and order from your Chinese competitor to see how things look from your customers perspective.

tanvach··on Rescuer at Fatal Tesla Cybertruck Crash Says Car Doors Wouldn't Open
Bringing up the design flaws of my Model Y in any Tesla groups and I got endless amount of toxicity or aggressive responses. Theres a lot of fanboyism unfortunately. Reminds me of Apple during the Jobs era, but more insidious.
tanvach··on Ask HN: Who wants to be hired? (October 2025)
Location: San Francisco, CA

Remote: Yes

Willing to relocate: No

Technologies: Python, R, SQL (Presto/Hive), Airflow, Tableau, C/C++, ML

Résumé: https://www.linkedin.com/in/tanvach

Email: See profile

I'm a Principal/Staff level Data Scientist with a background at Roblox, Meta, and Airbnb, and I'm looking to join an early-stage startup.

Having worked on scaling and optimizing products for millions of users, I want to apply that experience to building a company from its earlier stages. My background isn't just in data science; I've developed patented technology, and worked closely with product VPs to launch new initiatives.

I'm excited to help with:

- Product strategy

- Defining a technical roadmap

- Helping build the team

tanvach··on Ultra efficient vector extension for SQLite
There is the 'Additional Grant for Open-Source Projects' section that seems to permit inclusion in open source project. Do you mind explaining why you think this is not enough? I'm not an expert in licenses so genuinely interested in your take.
tanvach··on Improved Gemini 2.5 Flash and Flash-Lite
Yes agree, it was totally broken when I tested the API two months ago. Lots of failed to connect and very slow response time. Hoping the update fixes these issues.
tanvach··on Ask HN: Has anyone else been unemployed for over two years?
This is my 12th month. I quit due to the birth of my son, and honestly he has kept me plenty busy for now. The hardest part for me is the lack of friends who are in the same situation.
tanvach··on Addendum to GPT-5 system card: GPT-5-Codex
I also noticed the laziness compared to Sonnet models but now I feel it’s a good feature. Sonnet models, now I realize, are way too eager to hammer out code with way more likelihood of bugs.
tanvach··on What Is the Fourier Transform?
Hmm I always viewed it as sum over orthogonal bases. Sine/Cosine is choice, while there can be many other bases, like Legendre polynomials. Can you explain more how FT is linked to 'a sum over equivalence classes'?
tanvach··on John Carmack's arguments against building a custom XR OS at Meta
Yeah reverse engineering all the drivers is going to be a huge headache.
tanvach··on John Carmack's arguments against building a custom XR OS at Meta
Fun rumor: Google shut down the AR effort and transferred the team to project Fuchsia as a way to retain highly skilled employees. So essentially they didn’t have any real technical needs for a new OS.
tanvach··on John Carmack's arguments against building a custom XR OS at Meta
Yup it’s because they had to rewrite the drivers I presume. Always going to be the biggest issue with any new OS.
tanvach··on John Carmack's arguments against building a custom XR OS at Meta
Was at Oculus post acquisition and can say that the whole XROS was an annoyance and distraction the core technology teams didn’t need. There were so many issues with multiple tech stacks that needed fixing first.

Mind you, this XROS idea came after Oculus reorged into FB proper. It felt to me like there were FB teams (or individuals) that wanted get on the ARVR train. Carmack was absolutely right, and after the reorg his influence slowly waned for the worse.

tanvach··on John Carmack's arguments against building a custom XR OS at Meta
I think people have forgotten about Google Fuchsia which I guess is a good sign for a new OS. They’ve done quite well in deploying it seamlessly to their consumer devices.
tanvach··on I Am An AI Hater
I was. My parents had first versions of analog cell phones and they were truly live savers no one ever complained about how they will destroy society.
tanvach··on I Am An AI Hater
Nothing before it is worshipped and hated at this proportion
tanvach··on I Am An AI Hater
Age is observable
tanvach··on I Am An AI Hater
I've noticed that the younger you are, the most likely you're in love with AI. So the tide will turn eventually, for better or worse. I talked to someone recently who claims with no irony that 'AI has zero downside'.

I don't hate AI. I hate the people who're in love with it. The culture of people who build and worship this technology is toxic.

tanvach··on Attention Is the New Big-O: A Systems Design Approach to Prompt Engineering
Article doesn’t seem to include results. Only the prompts.
tanvach··on Transparent Ambition: on translucent user interfaces
Some people will say that iOS has an option for ‘reduce transparency’ that mitigates the issue. But every time I turn it on, there’s a general lack of design polish in the OS and apps due to it not being the default.

Another point: I wonder how much of this is for the OS designer/UX/UI team to justify their existence at Apple. Suspect it’ll start out very glassy and gets flatter over time, so that they can claim ‘improvement to user experience’ over many years to come.

tanvach··on 3D printable 6" f/5 compact travel telescope model
I’ve just been looking for a telescope that’s backpackable. Thank you for posting this!
tanvach··on What Google Translate can tell us about vibecoding
Very neat, love how there’s a formality level selection! Google translate has such bad tendencies to use very formal language (at least when translating into Thai) that it’s almost useless in real life. Some English to Thai examples I tried so far have been quite natural.
tanvach··on Texting myself the weather every day
Having explored Twillio for text messaging recently, turns out it’s getting very hard to be able to send them programmatically in the US due to lengthy A2P registration process. I understand in spirit this aims to reduce text spam, but my feeling is this becoming another money making opportunity for carriers.

https://www.twilio.com/docs/flex/admin-guide/setup/conversat...

tanvach··on Show HN: I made an app to create personalized stories for children in 5 minutes
I'm sure you will get very polarized opinion here. I wish good luck to your project.

Getting to the goal faster can be great. I've started illustrating books for my son and I can see the appeal for this tool, especially as a non-artist.

But to me the journey to a arrive at a book (sketching, going to the library, buying books together) are the things that ultimately create memories and meaning. AI should allow you to have more time for these activities rather than removing them entirely.

tanvach··on Reservoir Sampling
From data science perspective, the volume of the data also encodes really valuable information, so it’s good to also log the number of data points each one represents. For example, if sampling rate comes out to be 10%, have a field that encodes 10. This way you can rebuild and estimate most statistics like count, sum, average, etc.
tanvach··on Low cost, high speed data acquisition over HDMI [video]
My understanding of the motivation for this (really neat) hack is that cheap FPGA boards lack IO pins to interface to USB3 interface chip and external components (i.e. parallel DAC) at the same time. Seems like these boards tend to have built--in connector that uses up the GPIO pins.

Wonder then if it's possible to use the HDMI port to connect a custom board with the USB3 chipset. Maybe the crosstalk between the wires is too high.

tanvach··on LLMs understand nullability
Dear future authors: please run multiple iterations and report the probability.

From: ‘Keep training it, though, and eventually it will learn to insert the None test’

To: ‘Keep training it, though, and eventually the probability of inserting the None test goes up to xx%’

The former is just horse poop, we all know LLMs generate big variance in output.

tanvach··on SQL or Death? Seminar Series – Spring 2025
I dunno, personally when I teach SQL to engineers, it’s not the syntax that is the main difficulty (yes it can be improved) but the relational data mental model that trips people up. They all want sequential data processing and loops. Translating that to vectorized code is the closest thing I got to help non-data people grok.
tanvach··on Stats – macOS system monitor in your menu bar
I've just switched, mainly it works 100% while some menumeter sensors do not show up on the menu bar for me. The drop down menu is also much more informative and modern with charts.
tanvach··on Phase behavior of Cacio and Pepe sauce
Sometimes I forget to stir and have to reboil the pasta. Long noodles like spaghetti will stick like crazy and have inconsistent cooking. If I need to cook quickly I use less water. Otherwise more water is hands off.
tanvach··on I am rich and have no idea what to do
Children are giver of immense sense of satisfaction that’s totally disconnected to wealth (though being wealthy certainly helps). Just remember - no short cuts.
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