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Daniel Pertu

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Location London Joined Joined on  Personal website https://cogniprep.app

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Founder of CogniPrep

Electron says 'unspecified', Playwright wants 'Lax', and the session cookies vanished
daniel_pertu profile

Electron says 'unspecified', Playwright wants 'Lax', and the session cookies vanished

#electron #playwright #javascript #webdev
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5 min read

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A 429 is not a no: the three answers our licence check has to tell apart
daniel_pertu profile

A 429 is not a no: the three answers our licence check has to tell apart

#electron #typescript #api #webdev
Comments
4 min read
Our 15 search limit is a latency budget, not a pricing tier
daniel_pertu profile

Our 15 search limit is a latency budget, not a pricing tier

#electron #typescript #architecture #performance
Comments
4 min read
The consent checkbox we tick for you, and the one we never will
daniel_pertu profile

The consent checkbox we tick for you, and the one we never will

#typescript #ux #electron #programming
Comments
5 min read
€1450 per month is rent, €9.99 per month is a paywall, and one digit tells them apart
daniel_pertu profile

€1450 per month is rent, €9.99 per month is a paywall, and one digit tells them apart

#typescript #regex #webdev #node
Comments
5 min read
21 reply statuses, and the 8 that mean never touch this listing again
daniel_pertu profile

21 reply statuses, and the 8 that mean never touch this listing again

#electron #typescript #node #architecture
Comments
5 min read
Prices round up, discounts round down, and one package decides both
daniel_pertu profile

Prices round up, discounts round down, and one package decides both

#stripe #typescript #saas #webdev
Comments 1
6 min read
Rewriting a million rows when the only acceptable diff is zero bytes
daniel_pertu profile

Rewriting a million rows when the only acceptable diff is zero bytes

#postgres #database #node #devops
Comments
6 min read
135,692 label words in 49 languages, and not one model call in the path
daniel_pertu profile

135,692 label words in 49 languages, and not one model call in the path

#i18n #typescript #architecture #webdev
Comments
6 min read
An ingredient nobody has looked at yet is not an ingredient that is fine
daniel_pertu profile

An ingredient nobody has looked at yet is not an ingredient that is fine

#typescript #architecture #programming #webdev
Comments
6 min read
Our web app is the phone app: 103 files, 14 web branches, one .web.tsx
daniel_pertu profile

Our web app is the phone app: 103 files, 14 web branches, one .web.tsx

#expo #reactnative #webdev #typescript
Comments
5 min read
Zero img tags on our landing page, and four of the phones on it are app screens
daniel_pertu profile

Zero img tags on our landing page, and four of the phones on it are app screens

#css #react #nextjs #webdev
Comments
4 min read
A nightly Postgres backup for $0, and the four things that break it
daniel_pertu profile

A nightly Postgres backup for $0, and the four things that break it

#postgres #devops #githubactions #cloudflare
Comments
4 min read
A two-column desktop layout that has to be byte-identical on mobile
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A two-column desktop layout that has to be byte-identical on mobile

#css #tailwindcss #react #webdev
Comments
4 min read
An internal tool that edits entitlements has to write two records, not one
daniel_pertu profile

An internal tool that edits entitlements has to write two records, not one

#webdev #postgres #typescript #database
Comments
4 min read
157 lines added, 1,849 deleted: what an anonymous path actually cost us
daniel_pertu profile

157 lines added, 1,849 deleted: what an anonymous path actually cost us

#webdev #react #nextjs #architecture
Comments
4 min read
A one-shot review prompt, and the timestamp that decides when to spend it
daniel_pertu profile

A one-shot review prompt, and the timestamp that decides when to spend it

#webdev #postgres #sql #typescript
Comments
4 min read
A signed permit that names the game, not the content it unlocks
daniel_pertu profile

A signed permit that names the game, not the content it unlocks

#webdev #security #typescript #nextjs
Comments
4 min read
We block first paint with an inline script on purpose, and the list inside it is generated
daniel_pertu profile

We block first paint with an inline script on purpose, and the list inside it is generated

#nextjs #react #css #webdev
Comments
4 min read
Our landing page for the weakest feature says the evidence is weak, because the page reads it from the engine
daniel_pertu profile

Our landing page for the weakest feature says the evidence is weak, because the page reads it from the engine

#nextjs #typescript #seo #architecture
Comments
5 min read
One content registry, four consumers, and the RSS feed that inherited an editorial order
daniel_pertu profile

One content registry, four consumers, and the RSS feed that inherited an editorial order

#nextjs #seo #typescript #webdev
Comments
4 min read
Your title template spends ten of your sixty characters, and nobody counts them
daniel_pertu profile

Your title template spends ten of your sixty characters, and nobody counts them

#seo #testing #nextjs #typescript
Comments
6 min read
One string is the page title, the h1 and the JSON-LD headline, which makes shortening it a content edit
daniel_pertu profile

One string is the page title, the h1 and the JSON-LD headline, which makes shortening it a content edit

#seo #nextjs #typescript #webdev
Comments
4 min read
A data export needs a field explaining what is not in it
daniel_pertu profile

A data export needs a field explaining what is not in it

#privacy #nextjs #typescript #postgres
Comments
5 min read
libvpx-vp9 writes the alpha_mode tag and throws your alpha away
daniel_pertu profile

libvpx-vp9 writes the alpha_mode tag and throws your alpha away

#video #ffmpeg #node #react
Comments
5 min read
Three layers over one product, and only one of them is allowed to say no
daniel_pertu profile

Three layers over one product, and only one of them is allowed to say no

#typescript #architecture #webdev #programming
Comments
5 min read
Our ads are 28 React compositions, and the constraint is that any two must cut together
daniel_pertu profile

Our ads are 28 React compositions, and the constraint is that any two must cut together

#react #video #design #typescript
Comments
6 min read
Two apps, two ways of knowing where you are, one price table
daniel_pertu profile

Two apps, two ways of knowing where you are, one price table

#typescript #reactnative #stripe #webdev
Comments
6 min read
Every thirty seconds it fails, and you should get one email, not 2,880
daniel_pertu profile

Every thirty seconds it fails, and you should get one email, not 2,880

#node #typescript #architecture #ux
Comments
6 min read
Our query timeout had to be set on the Postgres role, because the pooler throws away everything else
daniel_pertu profile

Our query timeout had to be set on the Postgres role, because the pooler throws away everything else

#postgres #nextjs #devops #webdev
Comments
4 min read
We took zod out of our login page, and kept exactly one definition of a valid password
daniel_pertu profile

We took zod out of our login page, and kept exactly one definition of a valid password

#performance #typescript #webdev #nextjs
Comments
4 min read
Scanning the same pack twice in one aisle is one entry, not two
daniel_pertu profile

Scanning the same pack twice in one aisle is one entry, not two

#reactnative #typescript #mobile #ux
Comments
5 min read
Four places state lives in our Electron app, sorted by when it is allowed to die
daniel_pertu profile

Four places state lives in our Electron app, sorted by when it is allowed to die

#architecture #electron #typescript #node
Comments
6 min read
autofocus='off' is the one that keeps focusing, and two other reasons our label photos were blurry
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autofocus='off' is the one that keeps focusing, and two other reasons our label photos were blurry

#reactnative #expo #mobile #typescript
Comments
6 min read
More JavaScript arrives after our landing page loads than before it
daniel_pertu profile

More JavaScript arrives after our landing page loads than before it

#performance #nextjs #webdev #javascript
Comments
4 min read
The first check after a restart is not allowed to tell you anything
daniel_pertu profile

The first check after a restart is not allowed to tell you anything

#electron #typescript #architecture #node
Comments
5 min read
Same document, two URL spaces, because intent is not content
daniel_pertu profile

Same document, two URL spaces, because intent is not content

#seo #nextjs #typescript #webdev
Comments
6 min read
The price in our structured data comes from the constant Stripe charges
daniel_pertu profile

The price in our structured data comes from the constant Stripe charges

#seo #nextjs #typescript #webdev
Comments
6 min read
Our support inbox is a webhook, and two angle brackets were breaking the images
daniel_pertu profile

Our support inbox is a webhook, and two angle brackets were breaking the images

#node #email #nextjs #webdev
Comments
6 min read
Two products, one Stripe event, and the branch that must come first
daniel_pertu profile

Two products, one Stripe event, and the branch that must come first

#stripe #saas #typescript #webdev
Comments
6 min read
A student house is one IP address, so our rate limit counts licences
daniel_pertu profile

A student house is one IP address, so our rate limit counts licences

#nextjs #node #api #security
Comments 1
6 min read
When a block clears, only one search goes back in
daniel_pertu profile

When a block clears, only one search goes back in

#node #typescript #architecture #webdev
Comments
5 min read
The only cross-origin browser caller of our API is our own app
daniel_pertu profile

The only cross-origin browser caller of our API is our own app

#webdev #security #nextjs #reactnative
Comments
6 min read
Two keys per endpoint, and the decision to fail open is made route by route
daniel_pertu profile

Two keys per endpoint, and the decision to fail open is made route by route

#security #node #api #webdev
Comments
6 min read
A date is prose, a version is a key: five systems read our terms version
daniel_pertu profile

A date is prose, a version is a key: five systems read our terms version

#webdev #privacy #typescript #saas
Comments
5 min read
A client-sent confidence score is not evidence, so our OCR route signs for its own work
daniel_pertu profile

A client-sent confidence score is not evidence, so our OCR route signs for its own work

#security #node #typescript #webdev
Comments
5 min read
Curation reaches the phone without an app release, and the version is just max(updated_at)
daniel_pertu profile

Curation reaches the phone without an app release, and the version is just max(updated_at)

#postgres #caching #architecture #typescript
Comments
6 min read
Every number on our recipe pages is derived, because a second copy would drift
daniel_pertu profile

Every number on our recipe pages is derived, because a second copy would drift

#typescript #testing #architecture #webdev
Comments
6 min read
93 of the 199 questions in our FAQ markup are not on the page
daniel_pertu profile

93 of the 199 questions in our FAQ markup are not on the page

#seo #nextjs #typescript #webdev
Comments
4 min read
A link is not a link until you have read its rel attribute
daniel_pertu profile

A link is not a link until you have read its rel attribute

#seo #python #webdev #marketing
Comments
5 min read
Our force flag did strictly less work than not passing it
daniel_pertu profile

Our force flag did strictly less work than not passing it

#postgres #nextjs #typescript #webdev
Comments
5 min read
Search Console said position 7.4, the live search result said nowhere
daniel_pertu profile

Search Console said position 7.4, the live search result said nowhere

#seo #webdev #javascript #analytics
Comments
4 min read
Google found 28 of our pages and indexed none of them
daniel_pertu profile

Google found 28 of our pages and indexed none of them

#seo #nextjs #typescript #webdev
Comments
4 min read
Our SEO copy was sr-only and aria-hidden, so nobody could read it
daniel_pertu profile

Our SEO copy was sr-only and aria-hidden, so nobody could read it

#seo #nextjs #a11y #webdev
Comments
5 min read
Two DMGs, because a universal build would ship two Chromiums
daniel_pertu profile

Two DMGs, because a universal build would ship two Chromiums

#electron #devops #node #webdev
Comments
7 min read
A settings file with one field left, and a migration that only deletes
daniel_pertu profile

A settings file with one field left, and a migration that only deletes

#electron #typescript #architecture #security
Comments
6 min read
A hook whose return value nobody uses
daniel_pertu profile

A hook whose return value nobody uses

#react #typescript #electron #webdev
Comments
5 min read
The app found the listing, and then had nothing to show you
daniel_pertu profile

The app found the listing, and then had nothing to show you

#electron #typescript #architecture #node
Comments
6 min read
A 200 from IndexNow does not mean it read your key
daniel_pertu profile

A 200 from IndexNow does not mean it read your key

#seo #node #typescript #webdev
Comments
7 min read
fs.cpSync copied the framework and left every symlink pointing at the cache
daniel_pertu profile

fs.cpSync copied the framework and left every symlink pointing at the cache

#electron #node #macos #javascript
Comments
5 min read
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