Kiran PK — WritingNotes from production — concurrency, databases, testing, and the bugs that taught me something.https://kiranpk.dev/en-usI Backtested Dual Momentum on Indian Markets Over 19 Years — Here's What Actually Workedhttps://kiranpk.dev/blog/dual-momentum-nifty-backtest/https://kiranpk.dev/blog/dual-momentum-nifty-backtest/19 years of data, 8 rounds of testing, and two silent data bugs that would've fooled anyone — building and correcting a dual-momentum strategy for Nifty, Gold, and cash.Sat, 22 Aug 2026 00:00:00 GMTQuantitative InvestingBacktestingNifty 50File Signature: How Systems Actually Detect File Typeshttps://kiranpk.dev/blog/file-signature/https://kiranpk.dev/blog/file-signature/A file extension is a hint, not a fact. How magic bytes actually identify a file — and where signature-based detection breaks down.Wed, 11 Mar 2026 00:00:00 GMTSystemsSecurityGolangConcurrency in Practice — A Job Claiming System That Workshttps://kiranpk.dev/blog/job-claiming-concurrency/https://kiranpk.dev/blog/job-claiming-concurrency/Concurrency bugs rarely show up in development — they show up when real users hit the same row at once. Building a claim flow that never oversells a job.Thu, 01 May 2025 00:00:00 GMTConcurrencyPostgresGolangHandling Numeric Input in Go: Base Interpretation Mistakes to Avoidhttps://kiranpk.dev/blog/go-numeric-input/https://kiranpk.dev/blog/go-numeric-input/A leading zero quietly turned my input into octal. What Go's numeric literals actually do, and how to read integers the way you meant to.Mon, 11 Nov 2024 00:00:00 GMTGolangDebuggingHow I Built a WhatsApp Campaign Internal Toolhttps://kiranpk.dev/blog/whatsapp-campaign-tool/https://kiranpk.dev/blog/whatsapp-campaign-tool/Replacing manually-run scripts with a real scheduling and execution system for outreach campaigns — EventBridge, Lambda, and a CSV.Fri, 05 Jan 2024 00:00:00 GMTNode.jsAWSArchitectureImplementing a Simple Cache Invalidation System in Vue.jshttps://kiranpk.dev/blog/vue-cache-invalidation/https://kiranpk.dev/blog/vue-cache-invalidation/Caching is the easy half. A pragmatic way to know when cached content on the client has gone stale — and refresh it automatically after a release.Tue, 19 Sep 2023 00:00:00 GMTVue.jsFrontendPerformanceNavigating the Jest Memory Issue — My Workaroundhttps://kiranpk.dev/blog/jest-memory/https://kiranpk.dev/blog/jest-memory/Our backend API suite ran fine until it didn't — heap climbing until the runner died. How I chased it down and the workaround that kept CI green.Sat, 09 Sep 2023 00:00:00 GMTTestingNode.jsDebugging