I shut down the L train in a graph: max flow, min cut and AI agents on the New York subway
Picture 8 a.m. on a Wednesday in October. A signal fire in the Canarsie Tube stops the L between Bedford Av and 8 Av, in both directions, until furt…
Testing & QA
⚑ Report a ProblemLatest Testing & QA news from Tech News
All topics
agents
ai
api
architecture
automation
backend
beginners
career
claude
cybersecurity
devchallenge
devops
discuss
javascript
llm
machinelearning
mcp
node
opensource
performance
productivity
programming
python
security
showdev
softwareengineering
testing
tutorial
typescript
webdev
Combining Roblox and Robotics. Playing videogames by controlling the physical world.
This is a submission for the MLH x DEV Writing Challenge What We Built Roblotix is a set of Roblox games played by two people at once: a player at t…
Search finds documents. My graph finds consequences.
How I built Premise, a company brain for engineering decisions, on FalkorDB for WeMakeDevs × FalkorDB Graph Hacks. The 7 minute demo, if you prefer…
Before money moves, check with us: scam protection the family runs
This is a submission for the MLH x DEV Writing Challenge Every scam script has the same line in it: "Don't tell your family." So we built the opposi…
🛡️ DecisionShield: An AI That Audits Your Decision Before You Make It
Don't ask AI what to choose. Ask AI if you're ready to choose. We use AI every day to make decisions. Which technology should we use? Should we migr…
Your first hackathon: prepare well and get your project to a working demo
Go into your first hackathon with a task you can finish and explain. For a beginner, a good result is concrete: your team builds a working user flow…
The server locked the scores. The judge’s screen still said “Update.”
Glassbox had a misleading screen at exactly the moment a judging platform needs to be clearest. An organizer published the results. The server corre…
Keep an older search response from replacing the latest results
Give each search request a sequence number and only render the result that belongs to the latest search. A hackathon demo can look fine when typing…
From glBegin(GL_TRIANGLES) to CUDA Kernels: What Graphics Programming Taught Me About Systems
This is a submission for the MLH x DEV Writing Challenge What I Built I didn't build one big app. I spent the last few months building a lot of smal…
Build hackathon demo data without copying real identities
Build hackathon demo fixtures from invented records. Keep the scenario useful without copying real identities into a repository, presentation or scr…
UrbanPulseNYC
This is a submission for the MLH x DEV Writing Challenge What I Built We built UrbanPulse NYC , an AI-powered hazard detection, reporting, and aware…
MemoryDesk: Building an AI Customer Support Agent with Presistent Memory
MemoryDesk: Building an AI Customer Support Agent with Persistent Memory The Problem AI customer-support agents are useful, but a common limitation…
MLH Hack At Home 2020: Hearth
This is a submission for the MLH x DEV Writing Challenge What I Built Hearth is a voice-controlled smart home agent built for the moment we were all…
Signed hackathon results anyone can recompute and verify
Every hackathon platform converged on the same features then stopped at the judging. The biggest one cannot weight its criteria. The ones that adver…
Sentinel: The Automated Adversarial Testing Harness for LLM Applications
This is a submission for the MLH x DEV Writing Challenge What I Built AI products are shipping faster than anyone is testing them. In traditional so…
The Impostor Was Never Dealt. So We Made the Deal Provable.
This is a submission for the MLH x DEV Writing Challenge What I Built The last time Ayush Kumar and I entered the same hackathon, he led the team th…
FraudLens AI: An Autonomous Graph Agent That Investigates Financial Crime
Fraud rarely looks like fraud in a single row of data. It shows up in the connections: a shared IP address, a reused device, a chain of accounts tha…
Not An Insider (Just Lucky)
This is a submission for the MLH x DEV Writing Challenge What I Built What if the person betting on an outcome is also the person who can influence…
HotelFlow: hotels don’t need another dashboard — they need the next action
This is a submission for the MLH x DEV Writing Challenge Author: Ravi Saxena ( @ravi_saxena_6fd4d0ef1c9cb ) — solo. No teammates. What I Built Hotel…
Every Bug I Fixed Today Was Hiding Another One
Building MindMap Debugger for AWS First Commit — Day 2 On Day 1 , I got the first working version running — paste in an argument, and the tool reads…
Congrats to the DEV Weekend Challenge: Dog Days Edition Winners!
The results are in for our DEV Weekend Challenge: Dog Days Edition ! Thank you for your patience while we worked through judging, and thank you for…
What OSDHACK'26 Taught Us About Hackathons in the AI Era
Hi everyone, we're from OSDC, and this year we continued our flagship event, OSDHACK'26 , with a five-day hackathon focused on On-Device AI and Loca…
What Zero Dependencies Actually Meant for RepoX-Ray
## What Zero Dependencies Actually Meant for RepoX-Ray When we started building RepoX-Ray for Zero Dependency 2026, I thought zero dependency mainly…
I Built a Production Grade ML Candidate Ranking System
The Challenge Three months ago, I participated in the Redrob India Data & AI Challenge. Track 1: given 100,000 candidate profiles and a job desc…
The questions judges ask in hackathon Q&A, and how to answer them
Q&A is where I learn the most as an evaluator, because a team's answers reveal what the demo hid. Teams that prepare for these questions look li…
TwoKeys: AI Agents Can Act, but Should They Decide?
I created this article for the purpose of entering the All Things Agentic Hackathon . An AI agent already has the API key. It can read the campaign,…
Every company knows when it revoked access. None knows when access stopped.
Every company knows when it revoked access. None knows when access stopped. I built this for the All Things Agentic Hackathon , and I wrote this pos…
Mozaik Hackathon 2026: Build Concurrent Multi-Agent Systems and Compete for $1,000 in Cash Prizes
Building a multi-agent system sounds simple on a whiteboard. Give one agent a task, let another handle the next step, add a reviewer, connect a few…
The Phishing Site Tried to Talk to My AI. That Became the Evidence.
I wrote this piece for the purposes of entering Google's All Things Agentic Hackathon (Fortified Enterprise Fleet track). Somewhere in the HTML of a…
Four bugs in one paragraph: what I learned building an autonomous loop that chases people who don't answer
I built CrisisMesh for the All Things Agentic Hackathon , and I created this post for the purposes of entering that hackathon. #AllThingsAgenticHack…