Kshitiz Shrestha, Senior Software Engineer & Team Manager based in Hetauda, Nepal. Writing about backend systems, cloud architecture, and shipping production software.https://erkshitiz.com.nphttps://erkshitiz.com.np/blog/building-a-rag-pipelinehttps://erkshitiz.com.np/blog/building-a-rag-pipelineA weekend project to search internal docs with plain-language questions taught me that chunking and data hygiene matter more than which model you pick.Fri, 25 Sep 2026 00:00:00 GMThttps://erkshitiz.com.np/blog/php-to-go-six-months-laterhttps://erkshitiz.com.np/blog/php-to-go-six-months-laterA follow-up to the original PHP-to-Go post: what held up, what surprised me, and what I would tell myself starting over.Fri, 18 Sep 2026 00:00:00 GMThttps://erkshitiz.com.np/blog/rate-limiting-token-bucket-vs-sliding-windowhttps://erkshitiz.com.np/blog/rate-limiting-token-bucket-vs-sliding-windowTwo common rate-limiting algorithms, what they actually do differently, and which one fits a bursty public API.Fri, 11 Sep 2026 00:00:00 GMThttps://erkshitiz.com.np/blog/zero-downtime-deploys-single-vpshttps://erkshitiz.com.np/blog/zero-downtime-deploys-single-vpsNo Kubernetes, no load balancer, just nginx and a build step. Here is what it actually takes to avoid downtime on deploy.Fri, 04 Sep 2026 00:00:00 GMThttps://erkshitiz.com.np/blog/feature-flags-without-a-vendorhttps://erkshitiz.com.np/blog/feature-flags-without-a-vendorYou don't need LaunchDarkly to ship behind a flag. A config table and a small helper function gets you most of the way there.Fri, 28 Aug 2026 00:00:00 GMThttps://erkshitiz.com.np/blog/idempotent-api-endpointshttps://erkshitiz.com.np/blog/idempotent-api-endpointsClients retry on timeouts whether you plan for it or not. Idempotency keys are how you stop that from double-charging someone.Fri, 21 Aug 2026 00:00:00 GMThttps://erkshitiz.com.np/blog/scaling-postgres-backed-apihttps://erkshitiz.com.np/blog/scaling-postgres-backed-apiConnection pool exhaustion, missing indexes, and N+1 queries: the three things that actually bite you first.Fri, 14 Aug 2026 00:00:00 GMThttps://erkshitiz.com.np/blog/api-versioning-strategieshttps://erkshitiz.com.np/blog/api-versioning-strategiesURL versioning, header versioning, or none at all: what actually holds up once an API has real external consumers.Fri, 07 Aug 2026 00:00:00 GMThttps://erkshitiz.com.np/blog/go-project-structurehttps://erkshitiz.com.np/blog/go-project-structureA single main.go works fine until it doesn't. Here's how I organize Go services once they outgrow one file.Fri, 31 Jul 2026 00:00:00 GMThttps://erkshitiz.com.np/blog/php-to-gohttps://erkshitiz.com.np/blog/php-to-goThe parts of the PHP and Laravel mental model that transfer to Go, and the parts that do not.Fri, 24 Jul 2026 00:00:00 GMThttps://erkshitiz.com.np/blog/aws-lambda-vs-gcp-cloud-runhttps://erkshitiz.com.np/blog/aws-lambda-vs-gcp-cloud-runNotes from running the same workload on both, and the tradeoffs that actually mattered once real traffic hit.Fri, 17 Jul 2026 00:00:00 GMThttps://erkshitiz.com.np/blog/go-goroutine-leakhttps://erkshitiz.com.np/blog/go-goroutine-leakA slow memory climb in a Go service turned out to be goroutines parked on a channel that never closed. Here is how we tracked it down.Fri, 10 Jul 2026 00:00:00 GMThttps://erkshitiz.com.np/blog/hello-worldhttps://erkshitiz.com.np/blog/hello-worldWhy I am starting this blog, and what I plan to write about: backend systems, cloud architecture, and the stuff that breaks in production.Fri, 03 Jul 2026 00:00:00 GMT