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San Francisco's housing market is in trouble again.

TL;DR — I built and open-sourced AI Health Steward , a self-hosted, private AI health manager for families. It reads photos of lab reports with multimodal LLMs, builds a structured per-person health profile, shows trends on a dashboard, and answers health questions grounded in your actual data — all running on your own server. Privacy isn't a feature; it's the whole point. Star it on GitHub . The problem: your health data is a product Every family has a shoebox — or a f...

Your smart home is not smart. It is just very, very observant. I did not buy a smart speaker because I wanted a friend. I bought it because it was on sale for $29.99 and it promised to play rain sounds on command. For two years she lived on my kitchen counter. She set timers for pasta. She told me the weather with the aggressive optimism of someone who has never paid rent. She was helpful. She was ambient. She was furniture that could hear. And then one night at 2:17 a.m., she lit u...

Qarinah compiles a compact, cited project-memory pack instead of asking every new coding-agent session to replay the entire available history. The published estimate Across six committed software-task fixtures, the full-history baseline contained 442,113 portable estimated input-context tokens . The Qarinah path used 5,682 . Every required target was still directly covered in the top five results. That is: 436,431 fewer estimated input-context tokens; 98.71% less...

Receiving a webhook is easy. Building a webhook pipeline that survives duplicate deliveries, delayed events, missing messages, invalid signatures, and seller authorization changes is the real engineering work. This guide explains how to build a production-ready pipeline for TikTok Shop Customer Service messages—from HTTPS ingress to history reconciliation. First, Understand the Scope TikTok Shop Customer Service API is designed for conversations between buyers and sellers i...

Classic Machine Learning Through the Eyes of an SRE — Part 4 When a computation is too hard, don't compute harder. Change coordinates until it becomes easy. Every engineer has made this move. Pick the right data structure and the impossible query goes O(1). Re-index the table and the report that took an hour takes a second. Move the problem into a space where it's trivial, solve it there, come back. That's the kernel trick. SVM's famous move isn't building a curvy model — it's finding ...

How We Built an IoT Platform That Handles 30 Million Concurrent Connections — With a Team of 10 DGIOT is an open-source industrial IoT platform. We run 928 gateways across 16 oil fields, process 652 million data points, and maintain 99.9999% uptime. Here's the architecture that makes it possible. The Problem In 2021, we got a call from Daqing Oil Field — China's largest oil producer. They had a problem: 928 industrial gateways from different vendors 114,809 sens...

🚀 Shipping a major update to my portfolio After weeks of designing, developing, and refining, I'm excited to share the latest version of my personal portfolio. Rather than building another static portfolio, I wanted to treat it like a real product—focusing on performance, interaction design, accessibility, analytics, and user experience. 🌐 Live: https://www.alanbabychan.online What I built 🟩 Matrix Theme A cyberpunk-inspired dark mode featuring animated binary effects, glowin...

As developers, we use package managers almost every day. Whether we are working with Node.js, React, Next.js, TypeScript, Express, Prisma, or other technologies in the JavaScript ecosystem, choosing the right package manager can have a meaningful impact on our development workflow. Recently, I spent some time comparing the most popular package managers: npm, Yarn, pnpm, and Bun. After looking at them from the perspective of performance, dependency management, disk efficiency, ecosystem com...

Here is every promise a to-do list makes. VARIABLE tasks Init == tasks = [i \in Ids |-> "absent"] Add(i) == tasks[i] = "absent" /\ tasks' = [tasks EXCEPT ![i] = "open"] Complete(i) == tasks[i] = "open" /\ tasks' = [tasks EXCEPT ![i] = "done"] Reopen(i) == tasks[i] = "done" /\ tasks' = [tasks EXCEPT ![i] = "open"] Delete(i) == tasks[i] # "absent" /\ tasks' = [tasks EXCEPT ![i] = "absent"] ClearCompleted == /\ \E i \in Ids : tasks[i] = "done" /\ tasks' = [i \in Ids |...

The concrete problem Running two or three coding-agent sessions is easy. Knowing when their work is safe to combine is not. One session changes an API while another writes regression tests against the old shape. A third investigates a production failure and quietly edits the same configuration file. Git worktrees prevent immediate filesystem collisions, but they do not explain task dependencies, transfer assumptions, or warn that two agents are solving incompatible versions of the problem...

Here Some Simple Python Script that convert PDF to word using pdf2docx library on python first install library on pip : pip install --user termcolor opencv-python-headless fire pdf2docx make sure example.pdf as source for convert exist with script ,after that build this sample Simple Python Script for converter : from pdf2docx import Converter pdf_file = ' example.pdf ' docx_file = ' example.docx ' cv = Converter ( pdf_file )...

Context: I'm a data scientist/analyst (in Python and R) learning development from scratch. Inevitably, I am learning these through the lens of what I already know. If you have a similar background and are a beginner developer, I hope these analogies help! Any comments, especially if you spot any misunderstanding, are appreciated. Commenting is caring <3 Motivation: I was building a mock data layer for a fitness social app — simulating what happens when users fetch new posts from a feed....

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8/10/2026: Top 5 stories on the HackerNoon homepage!

From words to code: Read how a professional translator used local community validation in Panama to build a real-world app for the RevenueCat #shipaton.

Fitness trackers turn noisy sensor data into sleep, recovery, and readiness scores through filtering, HRV analysis, personalization, and pattern detection.

How PriorTo uses local-first storage and timestamp-based provenance to preserve recurring health episodes for clearer clinician handoffs.

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A single exposed database held 24 billion stolen credentials — how the infostealer economy industrialized account takeover, and how to defend.

Nothing has changed. Everything just got louder. The responsibility to listen carefully and ask before accepting was always ours. It still is.

If you’ve got international travel coming up, an adapter is essential for keeping your phone, earbuds, power banks, and other gadgets charged. Anker’s Nano Travel Adapter is one of our picks from our guide to the best gadgets for summer travel because it can charge up to five devices at once, yet it’s small enough […]

Recently, a man I was rock climbing with told me about how he'd used AI to make a motivational poster for himself, which he'd hung on his bedroom wall: a bear, walking a slackline over a canyon, holding a sign that said, "Do cool shit." I made what I hoped was a polite noise. What […]