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DEV Community · Technology

OpenClaw and the Boundary Problem

This is a submission for the OpenClaw Writing Challenge. Personal AI is usually sold as convenience. That is the wrong frame. If you want privacy-first, offline health tech to exist without surveillance funding it: sponsor the build → https://paintracker.ca/sponsor The real question is not how...

CrisisCore-Systems 1 day ago

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DEV Community · Technology

AI University: 3-File Pattern to Add Any AI Provider + Offline Fallback Content

AI University: 3-File Pattern to Add Any AI Provider + Offline Fallback Content What Is AI University 自分株式会社 includes "AI University" — a tab-based learning UI for 20+ AI providers (OpenAI, Google, Anthropic, Meta, xAI, Mistral, DeepSeek, etc.): Overview / Models / API...

kanta13jp1 1 day ago

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DEV Community · Technology

SM-2 Spaced Repetition in Deno + Flashcard UI in Flutter Web: Building a Duolingo Competitor

SM-2 Spaced Repetition in Deno + Flashcard UI in Flutter Web What We Built A language learning feature for 自分株式会社 competing with Duolingo and Anki: SM-2 spaced repetition algorithm (server-side in Deno) Flashcard flip UI with progress indicator Vocabulary deck managemen...

kanta13jp1 1 day ago

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DEV Community · Technology

Building a Public Guitar Gallery With 4 Users: Action Extension Pattern + Viral Design

Building a Public Guitar Gallery With 4 Users: Action Extension Pattern + Viral Design Why Build Community Features at 4 Users 自分株式会社 had 4 registered users when this was built. The counterintuitive argument: a discoverable place must exist before sharing behavior can em...

kanta13jp1 1 day ago

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DEV Community · Technology

Travel Planner + Whiteboard + Recipe Manager in Flutter Web: RadioListTile Migration & const Propagation

Travel Planner + Whiteboard + Recipe Manager in Flutter Web What We Shipped Three features in one session for 自分株式会社: Travel Itinerary Planner — competing with Google Travel, TripAdvisor Virtual Whiteboard — competing with Miro, Microsoft Whiteboard Recipe & Meal...

kanta13jp1 1 day ago

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DEV Community · Technology

Notion-Style Team Workspace in Flutter Web: Supabase RLS EXISTS Subquery + Invite Code Pattern

Notion-Style Team Workspace in Flutter Web: Supabase RLS EXISTS Subquery + Invite Code Pattern What We Built A team collaboration layer for 自分株式会社: Team creation with invite codes (8-char alphanumeric) Join via invite code (no email required) Shared notes within a team...

kanta13jp1 1 day ago

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DEV Community · Technology

CVR Tracking by Competitor Comparison Page: StatelessWidget StatefulWidget + unawaited() Pattern

CVR Tracking by Competitor Comparison Page: StatelessWidget → StatefulWidget + unawaited() The Problem 自分株式会社 has 21 competitor comparison pages (/vs-notion, /vs-slack, /vs-moneyforward, etc.). The question we couldn't answer: which comparison page drives the most signups...

kanta13jp1 1 day ago

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DEV Community · Technology

CRM Pipeline + Horse Racing AI in Flutter Web: Lead Scoring Formula & Kanban with LinearProgressIndicator

CRM Pipeline + Horse Racing AI in Flutter Web What We Shipped Two features in one session for 自分株式会社: CRM Sales Pipeline — competing with Salesforce (kanban + AI lead scoring) Horse Racing Predictor — competing with netkeiba (~17M users, AI prediction model)...

kanta13jp1 1 day ago

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DEV Community · Technology

Guitar Recording Auto-Post to X: OAuth 1.0a Server-Side + Twitter Intent Fallback

Guitar Recording → Auto-Post to X: OAuth 1.0a Server-Side + Twitter Intent Fallback The Architecture Flutter UI (guitar_recording_studio_page.dart) └─ _postToX(title, recordingId, isPublic: true) └─ supabase.functions.invoke('guitar-recording-studio', {action: 'shar...

kanta13jp1 1 day ago

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DEV Community · Technology

Next.js 15 Server Actions vs Route Handlers: When to Use Each (I Got This Wrong for 3 Months)

For the first three months I used Next.js 13+ App Router, I defaulted to Route Handlers for everything. Mutations? Route Handler. Form submissions? Route Handler. Deleting a record? Route Handler. I was mentally porting my Express habits into a framework that had evolved past them. Then I rewrote h...

Atlas Whoff 1 day ago

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DEV Community · Technology

Why Your AI Agent Has Root Access to Everything (And How to Fix It in 3 Lines of Python)

I’ve been building AI agents at work and kept running into the same problem: every framework lets agents call any registered tool with zero safety checks. An agent with database access can run DROP TABLE users and nothing stops it. So I built AgentShield-FW, a runtime firewall that intercepts every...

Avinash Amudala 1 day ago

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DEV Community · Technology

Why Your Productivity System is Actually Making You Less Productive

The Reason Why Your “God Tier” Productivity Hack Actually Makes You Unproductive Have we all been there? It feels productive when you have spent 4 hours to create the ultimate Notion dashboard by tagging, creating recurring databases, and color-coding everything. However, the problem here is that y...

Alex 1 day ago

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DEV Community · Technology

Why I stopped writing prompts and started compiling them

I've been building AI-powered tools for a while and I kept hitting the same wall. Not the models — the models are fine. The problem is how we use them. Every interaction with an AI starts from zero. You open a new conversation, paste your system prompt, explain your context, get partway through so...

brainbootdev 1 day ago

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DEV Community · Technology

Spec-Driven, AI-Assisted, Test-Validated — A Practitioner's Account

What made a two-week typesetting library possible, and what the methodology still lacks §0 — Hook Most accounts of AI-assisted development describe tools and workflows. Very few show primary sources: the actual specification documents, the actual errors caught, the actual decisions re...

Kemal Deniz Teket 2 days ago

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DEV Community · Technology

Security and String Interpolation

I've come back to share knowledge again after being in a long hiatus. Though it's more of a "back to the job searching" situation at the moment. I've recently been looking over recent CVEs and thought I'd share some knowledge of a rather common source of vulnerabilities: string interpolation....

Chris White 2 days ago

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DEV Community · Technology

Kiwi-chan Progress Report: Steady Mining!

Kiwi-chan Devlog: The Saga of the Wandering AI (and My Melting GPU) 🧭 Greetings, fellow digital pioneers and pixel wranglers! It's me, your humble tech blogger, back with another peek into the glorious (and sometimes gloriously frustrating) life of Kiwi-chan, our very own autonomous loca...

kiwi_tech 2 days ago

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DEV Community · Technology

I got tired of writing the same CDK wiring, so I built simple-cdk

I got tired of writing the same CDK wiring, so I built simple-cdk If you've written a few AWS CDK projects, you've probably noticed they all start the same way. You spin up a stack. You add a NodejsFunction for each Lambda handler. You wire up a Table for each DynamoDB model, set billing...

pujaaan 2 days ago

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DEV Community · Technology

I Let an AI Agent Supervisor Run Unattended for 19 Days. Here's What the Telemetry Says.

I shipped 13 releases of my AI agent supervisor in 14 days while the supervisor was running it. For 19 days — March 22 to April 10 — Batty managed our own development without a human in the dispatch loop. An operator was on Discord for escalations, but the planning, the test gating, the merges,...

Batty 2 days ago

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DEV Community · Technology

Best Terminal for Mac in 2026: Ghostty, Kitty, WezTerm, Alacritty, Warp & More

This post was originally published on vibehackers.io. Your terminal is the one tool you use more than your editor. Every git push, every npm install, every AI agent session runs through it. And in 2026, the gap between a good terminal and a great one is bigger than ever. GPU-accelerated rendering...

Vibehackers 2 days ago

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DEV Community · Technology

Chaos Engineering for Teams That Aren't Netflix

You Don't Need Chaos Monkey Every chaos engineering talk starts with Netflix and Chaos Monkey. Cool story. You're not Netflix. You probably have 5-50 services, not 500. You don't need a sophisticated chaos platform. You need a methodology. Start With Game Days Before injectin...

Samson Tanimawo 2 days ago

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DEV Community · Technology

Google Gemma 4 corre nativo en iPhone: lo probé y la brecha entre 'funciona' y 'es útil' sigue siendo enorme

En 2005, cuando administraba el cyber café, tuve mi primer contacto real con la brecha entre que algo funcione y que algo sirva. Instalé un proxy cache para optimizar el ancho de banda. Corría perfecto. Los logs mostraban hits. Y sin embargo, los pibes seguían quejándose de que el Counter-Strike lag...

Juan Torchia 2 days ago

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DEV Community · Technology

Beginner guide for anyone on ChatGPT who has never touched CODEX before. No terminal, no tech talk. Ten easy steps with a plain explanation and a tip

1. Get the Codex app onto your machine. You go to http://openai.com, find Codex up in the menu, hit the install button and grab the build for Mac or Windows I guess. Whole thing is about a minute, zero setup decisions along the way. A tip from me, even if you have been poking around Codex in the bro...

Matthias Meyer 2 days ago

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DEV Community · Technology

Why event-driven agents reduce scope, cost, and decision dispersion

Why event-driven agents reduce scope, cost, and decision dispersion Most agent systems do not control their costs because they spend tokens letting the model discover boundaries that the architecture should have defined up front. A task arrives. A general-purpose agent receives a large c...

Tirso García 2 days ago

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DEV Community · Technology

I built the most honest AI coding agent: it tells you exactly what it did (nothing)

I've been using AI coding agents for a while. They all share one thing: they sound very confident about work they may or may not have done. So I built one that's upfront about it. Meet p_ (Pinocchio) Asks smart clarifying questions (p...

Saniel Doe 2 days ago

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