SMSahil Maneinblogon.hashnode.dev·10h ago · 10 min readI built Jarvis, an approval-gated personal ops agent, on TrueForgeMost assistants wait for you to be the orchestrator. Jarvis does the opposite: you give it an outcome, it gathers evidence across your systems, and it stops before any irreversible write. I spent The 00
DZDanny Zhenginblog.hackunited.org·5d ago · 2 min readWhy Accuracy Isn't Enough: Evaluating Machine Learning Models the Right WayWhen building a machine learning model, accuracy is usually the first number people look at. If a model is 95% accurate, it sounds impressive. But accuracy doesn't always tell the full story. Imagine 20
DDDharany Dharanindharany.hashnode.dev·Aug 19 · 10 min readSiren-AI: Building an Acoustic Emergency Green Corridor, End to EndA technical deep-dive into the architecture, real datasets, and real bugs behind our SmartAIthon 2026 Grand Final project. Our slide deck says "Siren-AI clears traffic signals ahead of ambulances usin10
Vvimzhinzdress.hashnode.dev·Aug 17 · 9 min readBuilding Zdress: Virtual Try-On That Never Pulls You Out of the StoreOnline shopping gives us more choice than any physical store, but it also asks us to make a very visual decision with very little personal context. Every shirt is shown on somebody else. Every pair of00
DZDanny Zhenginblog.hackunited.org·Aug 16 · 2 min readWhat is a Package Manager?Let's say you are building your own app for some project and need a calendar feature. Writing hundreds of lines of code to calculate leap years and track days of the week is extremely annoying/tedious10
AAkashinakashbuilds.hashnode.dev·Aug 5 · 9 min readBuilding an Intelligent Message Router: A HackerRank Orchestrate Hackathon Solution - August 2026In August 2026, HackerRank hosted Orchestrate—a 24-hour hackathon challenge to build intelligent notification systems. The prompt: WhatsApp users face an information crisis. Family chats, work message00
DZDanny Zhenginblog.hackunited.org·Aug 3 · 2 min readHow WhatsApp Delivers Billions of Messages Every DaySending a message on WhatsApp feels almost instant. You type a message, tap Send, and within seconds it appears on someone else's phone sometimes on the other side of the world. But what actually happ20
SBSayan Biswasinstillreadingthedocs.hashnode.dev·Jul 27 · 1 min readAbout MeI'm Sayan Biswas — a CSE student who builds while still reading the docs. I don't stick to one stack. I'd rather stay versatile than be boxed into one thing, and I stay honest about what I know and wh00
LHLoops Houseinloopshouse.hashnode.dev·Jul 27 · 6 min readLoops House vs DevpostThe hackathon platform that judges your code, not your pitch deck This is for anyone choosing a hackathon platform, whether you're a DevRel or community team running a sponsor-driven public hackathon,00
JBJean-Sebastien Beaulieuinsecuredme-education.hashnode.dev·Jul 26 · 5 min readHackathon Winners Are Not Magic. Their Work Is Legible.OpenAI Build Week 2026 does not have public winners yet. That is important, because the honest move today is not to predict winners and not to pretend we know what the judges will decide. The more use00
