Daniel Pertu - DEV Community

Daniel Pertu

Sep 19

A list nothing derives from will drift, and ours did it twice

#typescript #testing #nextjs #webdev

1

5 min read

Daniel Pertu

Sep 19

Our entitlements are five independent axes, not a plan ladder

#saas #typescript #postgres #webdev

5 min read

Daniel Pertu

Sep 19

We asked for a review the moment someone paid, which is the worst moment

#webdev #postgres #ux #typescript

5 min read

Daniel Pertu

Sep 19

A CSS triangle vanished, because one selector matched by substring

#css #tailwindcss #webdev #debugging

1

5 min read

Daniel Pertu

Sep 19

Our scoring pipeline had one output, and for 31 tests it was the wrong one

#typescript #webdev #datascience #ux

5 min read

Daniel Pertu

Sep 19

If you generate the puzzle randomly, you have to solve it too

#javascript #algorithms #gamedev #webdev

6 min read

Daniel Pertu

Sep 19

Our prices are a function of the content, so the content is not allowed to lie

#typescript #saas #webdev #startup

4 min read

Daniel Pertu

Sep 19

for...in turned my nested arrays into objects, and the candidate scored zero

#javascript #typescript #testing #webdev

4 min read

Daniel Pertu

Sep 19

A sequential send loop hit a 10 per second rate limit, because it was fast

#node #serverless #email #webdev

5 min read

Daniel Pertu

Sep 19

Eleven branches, one shared file: the anchor rule that made them merge

#git #architecture #ai #productivity

5 min read

Daniel Pertu

Sep 19

The answer options were below the fold, on a 1440px screen

#css #react #tailwindcss #webdev

5 min read

Daniel Pertu

Sep 19

Every answer key in our product was on the CDN, with an immutable header

#security #nextjs #api #webdev

5 min read

Daniel Pertu

Sep 17

Our design tokens are a package, and the marketing site is deliberately not a consumer

#design #react #typescript #frontend

1

4 min read

Daniel Pertu

Sep 17

A nightly pg_dump that fails with the reason, not with "Network is unreachable"

#postgres #devops #github #database

4 min read

Daniel Pertu

Sep 17

Three capture screens in ninety minutes: what we deleted to make label photos readable

#reactnative #mobile #ux #typescript

5 min read

Daniel Pertu

Sep 17

We upgraded our job platform at 10:22 and deleted it at 13:34

#node #architecture #devops #typescript

5 min read

Daniel Pertu

Sep 17

120 milliseconds is not a delay, it is proof of a second frame

#reactnative #mobile #typescript #performance

5 min read

Daniel Pertu

Sep 17

One human agreement counts the same as one matching machine read

#architecture #database #typescript #ux

4 min read

Daniel Pertu

Sep 17

Green ticks for three hours: the lock whose TTL was the job's worst case

#redis #node #devops #architecture

4 min read

Daniel Pertu

Sep 17

Five sequential awaits before a cache hit could leave the building

#nextjs #performance #node #redis

4 min read

Daniel Pertu

Sep 17

Why our 404 page exists: the default one painted the header the wrong colour

#nextjs #css #seo #webdev

3 min read

Daniel Pertu

Sep 17

The session rides in the URL fragment: handing a login from the marketing site to the app

#webdev #security #javascript #supabase

4 min read

Daniel Pertu

Sep 17

Reply-To is the foreign key: threading support email onto tickets with plus addressing

#node #backend #webdev #architecture

5 min read

Daniel Pertu

Sep 17

Our house style is a 63-line unit test, and the first thing it caught was an email

#testing #typescript #webdev #writing

4 min read

Daniel Pertu

Sep 17

Fifty nine characters: the test that reads the title of every generated page

#seo #nextjs #testing #webdev

4 min read

Daniel Pertu

Sep 17

450 label words the test suite will not let us ship without

#testing #typescript #programming #webdev

4 min read

Daniel Pertu

Sep 17

A type with no word for "absent": an allergen layer that can only push down

#typescript #architecture #programming #webdev

4 min read

Daniel Pertu

Sep 17

The number the label does not print: reading fat off an ingredients list

#typescript #programming #architecture #webdev

5 min read

Daniel Pertu

Sep 17

A recipe is a scan with no camera: one rules engine, three surfaces

#typescript #architecture #webdev #seo

5 min read

Daniel Pertu

Sep 16

Consent is a version number, and the layout was writing it during render

#webdev #typescript #architecture #privacy

5 min read

Daniel Pertu

Sep 16

Write the ledger row first: the ordering that makes a credit balance auditable

#postgres #database #architecture #typescript

5 min read

Daniel Pertu

Sep 16

First touch wins: a personalisation hint that is allowed to be wrong

#javascript #react #webdev #ux

5 min read

Daniel Pertu

Sep 16

Twenty four strings got their own file, because one import cost every page 100 KB

#nextjs #typescript #performance #webdev

5 min read

Daniel Pertu

Sep 16

Chrome's MediaRecorder does not tell you how long the video is

#ffmpeg #node #javascript #webdev

5 min read

Daniel Pertu

Sep 16

One constant slows down every ad we render, and some clips are exempt

#showdev #react #video #typescript

1

5 min read

Daniel Pertu

Sep 16

Deleting 50,000 rows inside a 60 second serverless function

#postgres #database #node #webdev

5 min read

Daniel Pertu

Sep 16

The fingerprint we deliberately do not use to catch referral fraud

#security #typescript #architecture #webdev

5 min read

Daniel Pertu

Sep 16

Our concurrent login cap asked a question that was always true

#redis #webdev #backend #architecture

5 min read

Daniel Pertu

Sep 16

What should your app do when Redis is not there?

#webdev #redis #architecture #node

5 min read

Daniel Pertu

Sep 16

Every constant in this file is a promise to a player

#javascript #gamedev #webdev #programming

5 min read

Daniel Pertu

Sep 16

Deploying in the middle of a question: graceful shutdown for a WebSocket game server

#node #websockets #devops #architecture

4 min read

Daniel Pertu

Sep 15

Ten rate limiters, and the only hard question was what to key each one on

#webdev #backend #redis #architecture

4 min read

Daniel Pertu

Sep 15

null meant unlimited, so our free trial outranked the paid plan

#typescript #webdev #programming

4 min read

Daniel Pertu

Sep 15

Print is a feature: laying out A4 QR sheets in the browser with jsPDF

#showdev #javascript #webdev #react

1

4 min read

Daniel Pertu

Sep 15

The reconnect backoff that punished you for reconnecting

#react #javascript #webdev #debugging

1

4 min read

Daniel Pertu

Sep 15

The join flow is a URL: designing for a hundred strangers who will not install anything

#webdev #ux #nextjs #javascript

5 min read

Daniel Pertu

Sep 15

Our link preview cards are drawn by code, from the same three files as the site

#nextjs #react #webdev #design

4 min read

Daniel Pertu

Sep 15

The arithmetic IS the product: building a planner that tells people the truth

#react #webdev #javascript #ux

4 min read

Daniel Pertu

Sep 15

A random generator that is still on the page with JavaScript off

#react #nextjs #seo #webdev

4 min read

Daniel Pertu

Sep 15

Two build roots, one constant: the test that reads the other package's source

#typescript #testing #node #webdev

4 min read

Daniel Pertu

Sep 15

Seventy pages from one array: the content registry that cannot disagree with itself

#seo #nextjs #typescript #webdev

5 min read

Daniel Pertu

Sep 15

Two free tools, zero backend: what 'it never leaves your machine' buys you

#javascript #react #webdev #frontend

4 min read

Daniel Pertu

Sep 15

A WebSocket server you can run two of: Redis pub/sub fan-out in about 60 lines

#node #websockets #redis #webdev

5 min read

Daniel Pertu

Sep 15

Exponential decay is the fairest fast-answer scoring curve I could find

#javascript #typescript #programming #webdev

5 min read

Daniel Pertu

Sep 15

Never trust the player's clock: three timers that have to agree

#javascript #typescript #node #webdev

4 min read

Daniel Pertu

Sep 15

One hundred phones, one WiFi IP: rate limiting a room instead of a user

#webdev #node #redis #nextjs

1

5 min read

Daniel Pertu

Sep 15

Googlebot is not in your customers' country, and your pricing page just told it so

#seo #nextjs #webdev #programming

4 min read

Daniel Pertu

Sep 15

Free is free everywhere, and four other rounding bugs in a price formatter

#javascript #typescript #webdev #programming

5 min read

Daniel Pertu

Sep 15

Ship localised pricing in an afternoon, using a header your CDN already sends

#nextjs #webdev #typescript #react

5 min read

Daniel Pertu

Sep 14

Treating "failed" as terminal: idempotency when you cannot ask the recipient

#architecture #typescript #programming #node

1

4 min read

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