HVS — Builder, TinkererWriting about code, products, and interesting hacks.https://abouthvs.com/Why I built cogent42 - a single-file Claude Code bot for Telegramhttps://abouthvs.com/writing/why-i-built-cogent42/https://abouthvs.com/writing/why-i-built-cogent42/OpenClaw broke overnight due to an Anthropic policy change. Instead of fixing it, I replaced it with one file and three dependencies.Wed, 08 Apr 2026 00:00:00 GMTSomeone tried to social engineer me via LinkedIn. My AI agent caught it.https://abouthvs.com/writing/social-engineer-linkedin/https://abouthvs.com/writing/social-engineer-linkedin/A recruiter DM, a GitHub repo, and a backdoor hiding in 300 lines of fake test comments.Fri, 06 Mar 2026 00:00:00 GMTHow we dropped WhatsApp messaging costs by 85% with a product trickhttps://abouthvs.com/writing/whatsapp-cost-session-hack/https://abouthvs.com/writing/whatsapp-cost-session-hack/From INR 4.44 to INR 0.65 per message across 500k monthly messages - no infrastructure changes, just smarter session management.Fri, 10 Oct 2025 00:00:00 GMTHow we cut CDN costs from $5,000/month to $200 at Katha Adshttps://abouthvs.com/writing/cdn-cost-hack-katha-ads/https://abouthvs.com/writing/cdn-cost-hack-katha-ads/40-50TB of media per month, 125k DAU, and a two-part trick that dropped our CDN bill by 95%.Wed, 15 May 2024 00:00:00 GMT