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Our quiz app is two deployed things. A Next.js app, and a long-lived WebSocket server that holds the game clock, because a serverless function canno…
Short answer: keep the upload on the backend, send the generated image buffer straight to private object storage, and save only an immutable object…
Most AI automation demos are one await away from breaking. A webhook comes in, the handler calls a model, the response gets written to the database,…
A take-home that runs on the reviewer's laptop grades features; a take-home that runs anywhere grades engineering discipline. The task below asks a…
Traditional chatbot flows rely on static decision trees ( Press 1 for Sales, Press 2 for Support ). While predictable, they create severe user frict…
For years, npm install wappalyzer was how developers detected a website's technologies in code. The package's last release, 7.0.3 from August 2023,…
The best SMS alert API for a US/EU home-security SaaS is the one that lets the application own message intent and immutable evidence while the trans…
ive been maintaining this small opensource project GLM Proxy (glmproxy on npm) for a while and its finally on the level where im happy to share it o…
Short answer: for a Node.js avatar thumbnail, use Sharp to crop and resize the upload into fixed 32, 64, 128, and 256 pixel images, keep the origina…
I run a visa agency in Bali. The other half of my week goes into Apify Actors, and one of them profiles Shopify stores: you hand it a list of domain…
Hey dev community! 👋🏻 I'm Seif, a software engineer with 4 years of experience who absolutely hates vibe-coding and prefers designing architecture b…
A take-home that never simulates a host restart measures almost nothing about cost discipline. The packet below asks one question: after the machine…
Email tests often start with a simple promise: trigger a signup flow, wait for a message, click the link, and assert the account is active. It sound…
Booking.com takes 15-25% commission and owns the customer relationship. I run a small network of independent establishments in Luxembourg, and I wan…
For creator payout verification, keep OTP creation, expiry, verification, and session issuance on the server. Normalize US and EU phone numbers befo…
Notifio is an Electron app whose main process is also its HTTP server. There is no child process: app.whenReady() fires, and then one line pulls an…
The largest test file in PubTrivia is 543 lines, and it has no mocks in it. It calls the actual server actions a player's phone calls, and the actua…
Developers rush to rotate API keys for security, only to discover their AI‑powered apps suddenly start throwing 401 errors. The hidden culprit? A st…
A local-first router only pays off if tier 1 absorbs most of your traffic. If your local model answers 20% of prompts and escalates the rest, you di…
Short answer Short answer: keep generated images in a private object-storage bucket, persist the object key in your application database, and mint a…
Short answer: for realtime moderator disconnects in a gaming voice lobby, correlate observability signals across transport, session ownership, and f…
A JSON Web Token (JWT) is only as strong as the secret key that signs it. Yet the single most common JWT vulnerability in production is still a weak…
Introduction: Rethinking Hosting for Smaller Node.js Apps Hosting smaller Node.js applications has long been a balancing act between cost, performan…
Disclosure: I'm the developer of the tool described here, and an AI agent drafted this post from the project's source code. When a long-running AI c…
Instrument three server-side boundaries, but define the cost-attribution record before choosing the error backend. For a customer-support pricing ru…
We hit a wall last month. Traffic was stable, CPU was idle, but p99 latency spiked to 2s. The PostgreSQL server looked healthy. The culprit wasn't t…
A POST followed a 302 redirect and became a GET. Its body disappeared, but its Content-Type header stayed behind. That showed up while extending the…
An e-commerce access review becomes hard to sign when fraud, fulfillment, finance, and customer messaging all hold the marketplace webhook credentia…
Short answer: use a staged retrieval design with explicit collections, bounded queries, and traceable source context for recruiting candidate search…
I like the Supabase JS client. .from('todos').select('id, task').eq('done', false) reads like what I mean, and { data, error } means I'm not wrappin…