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jacekm

563 karma · joined May 20, 2015

Jacek Maciejewski is a QA Engineer living in Poznań (Poland). Loves traveling, especially around Japan.

Currently: Lead QA Engineer at VML (after series of rebrandings Cognifide -> Wunderman Thompson -> VML) Poznań, Poland (Feb 2017-present)

Previous positions:

    * Senior QA Consultant at ThoughtWorks London (Oct 2014 - Mar 2016)
    * Senior QA Engineer at Cognifide Poznań, Poland (Feb 2011 - Sep 2014)
Education:

    * Hokkaido University (Sapporo, Japan)
    * Adam Mickiewicz University (Poznan, Poland)
website: https://maciejewski.eu

[ my public key: https://keybase.io/jacek; my proof: https://keybase.io/jacek/sigs/3XArjWFBqBHtwB0NujKq9C9x-t4hAmLa9ntXBFHMCsM ]

submissionscomments
jacekm··on CVE-2026-111943: Compromised Intermediate Certificate Authority
Yeah, at some point I gave up and asked AI to do patching for me. It was a good call because it found affected certificates in places where I wouldn't look (e.g. aws-cli or Libre Office).
jacekm··on Things to know when you get cancer
> Asking for a second opinion sucks. A lot of us are preconditioned from birth to trust our clinicians.

I wonder if it's a cultural thing. I live in Poland, here we ask for second, third and sometimes more opinions in cases far more trivial then cancer. We do this before any kind of surgical procedure, painful treatment, anything that could be even unpleasant. I saved myself from a couple of root canal treatments just by consulting different dentists. We don't trust doctors at all.

jacekm··on Greenvolt begins building 600 MW/2.4 GWh BESS in Poland
These ones are from BYD, however Poland is constructing another, smaller BESS in parallel where the batteries will be supplied by LG Energy Solution and manufactured near Wrocław, Poland.
jacekm··on US closely monitoring case of lab worker who possibly died of plague in Siberia
To be fair, in Europe, we largely rejected the russian COVID vaccine. In theory we had good reasons, the vaccine was a bit shady, but I always wondered how much geopolitics played the role and how much it was really the problem with russian manufacturing standards.
jacekm··on AI companies destroy physical books – let's scan rare books before it's too late
> The project was met with significant legal challenges from authors and publishers which was eventually overcome

I don't think they were overcome. As far as I remember Google couldn't make the books available so they abandoned the project. They possess the scans (if they didn't delete them) but they won't be made public.

jacekm··on I spent twenty years becoming good at the wrong game
> People are getting loans for their education

In some countries they do, in some they don't, in others every PhD student even gets a scholarship. Every person I know who did the PhD did it because they loved the topics they were studying. The author of the blogpost is from Russia, I bet he didn't have to pay for his PhD.

jacekm··on Advancing the price-performance frontier with GPT‑5.6
Thank you for such detailed answer!
jacekm··on Advancing the price-performance frontier with GPT‑5.6
How will this affect the newly build data centers? What effect do you think it will have on memory prices?
jacekm··on EU fines Google €890M for competition breaches over search and apps
Pretty well, to the point where the US administration complains that there's a trade imbalance. (which is true for manufactured goods, false when we count in services)
jacekm··on Codex scraped the ICM website and discovered 2026 Fields Medal winner list
Chrome sends home the urls you visit together with the page performance data (and probably more). That's how they build Chrome User Experience Report (CrUX) for the most popular sites: https://developer.chrome.com/docs/crux
jacekm··on How to Survive 3 Years in North Korea as a Foreigner
I remember one Polish diplomat recalling that his boss told him "I am sending you to the safest outpost in the world" when offering him embassy in North Korea.
jacekm··on Nintendo announces new product revisions in Europe with replaceable batteries
I think I've read somewhere that JIS was phased out after Philips standard included some of JIS features and that theoretically modern Philips screwdrivers should be compatible with JIS.
jacekm··on Japanese verb conjugation the simple hard way
For me the biggest problem was never memorizing the suffixes but determining whether the verb belongs to group 1 or 2. While you can tell immediately that some verbs belong to group 1, the others (e.g. kaeru mentioned in the post) are not so easy (as far as I know there's no algorithm for that and you just need to memorize with every verb to which group it belongs).
jacekm··on Hetzner Price Adjustment
And they're not just hiding, Jan Marsalek is allegedly actively managing FSB operations against European states.
jacekm··on Hetzner Price Adjustment
Yup, I signed last weekend, they asked me for a passport and I deleted the account immediately. Scaleway also asks for ID. I am gonna try OVH next.
jacekm··on Memory has grown to nearly two-thirds of AI chip component costs
A fab takes years to build even when you have the necessary know-how. If you don't it'll take some additional experimenting before you can compete with the established manufacturers. By the time you can produce a usable chip the shortage might be over.
jacekm··on Memory has grown to nearly two-thirds of AI chip component costs
There is a good article (featured on HN a couple of days ago) that explains the issue: https://davidoks.blog/p/ai-is-killing-the-cheap-smartphone
jacekm··on Amazon workers under pressure to up their AI usage are making up tasks
Slack recently introduced this option where it can tell you what kind of animal you are (not kidding) based on the conversations you had. When I saw this I immediately thought "managers pushed poor folks at Slack to incorporate more AI into the product".
jacekm··on Remind HN: Today is Mother's Day, call your moms
In Poland it's on 26th of May.
jacekm··on Poland is now among the 20 largest economies. How it happened
Anecdotal, but the company I work for offers to the juniors only +15% to what it used to offer 15 years ago. The salaries are growing mostly because previous government introduced huge increases to minimal salaries, but I don't feel the wages in IT grew significantly over the years. Which actually make sense - we used to have huge disproportion between regular worker salaries and IT ones, now the difference is getting smaller.
jacekm··on Poland is now among the 20 largest economies
I know that Ukraine takes Polish experiences into account and consults with Poles on what went well and what not during our post-communist transformation and later the EU membership. They are keen on not repeating our mistakes. There were many Ukrainians working in Poland long before the full scale work so naturally many Ukrainians were looking at Poland hoping that their country could eventually replicate polish success.

But I don't think our example has an effect on morale and spirit of resistance.

jacekm··on OpenAI's o1 correctly diagnosed 67% of ER patients vs. 50-55% by triage doctors
https://aistudio.google.com/
jacekm··on All phones sold in the EU to have replaceable batteries from 2027
$60 has different value in other parts of the world.
jacekm··on Ask HN: European Tech Alternatives?
I'll use the opportunity to ask what's the cheapest cold storage in the EU? I am looking for an alternative to AWS Glacier Deep Archive.
jacekm··on Show HN: Cq – Stack Overflow for AI coding agents
I was skeptical at first, but now I think it's actually a good idea, especially when implemented on company-level. Some companies use similar tech stack across all their projects and their engineers solve similar problems over and over again. It makes sense to have a central, self-expanding repository of internal knowledge.
jacekm··on Never buy a .online domain
A couple of years ago someone associated my email with their bank account in Santander UK. I tried to get in touch with Santander but turned out that the only way to do so is to either make an international call (I don't live in UK) or send them a paper letter. I gave up and just routed these emails to separate folder.
jacekm··on Pope tells priests to use their brains, not AI, to write homilies
Long before AI era I read an article about homilies exchange online forum in Poland. The priests spoke how they struggle to come up with a fresh content every week for Sunday masses. AI is not the source of the problem, it's just an attempt at a solution.
jacekm··on Europe's $24T Breakup with Visa and Mastercard Has Begun
Like the article mentioned many EU countries have their own payment systems. The challenge is not to build something from the scratch but rather to make existing solutions interoperable. The first talks about cross-border integrations started many years ago but they went very slowly. However, some work is being done, just a week ago a first transfer was done from Spanish Bizum to Polish Blik.
jacekm··on Europe's $24T Breakup with Visa and Mastercard Has Begun
TBH many European payment apps use the phone number as an ID and people seem to love it. I share the privacy concerns but if I don't want someone to know my phone number I just give them my IBAN.
jacekm··on GPT-5.3-Codex
It's here: https://platform.claude.com/docs/en/about-claude/models/over...

Reliable knowledge cutoff: May 2025, training data cutoff: August 2025

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