Backend, infrastructure, and WebRTC — written up from production debugging sessions.https://readjulsmd.com/https://readjulsmd.com/blog/do-not-tail-f-dev-null-to-keep-a-container-running-the-role-of-the-pid-1-process/https://readjulsmd.com/blog/do-not-tail-f-dev-null-to-keep-a-container-running-the-role-of-the-pid-1-process/While reviewing a legacy system at work, I came across a container setup where a Python script was running as a background job. To keep the…Fri, 18 Jul 2025 00:00:00 GMThttps://readjulsmd.com/blog/lambda-does-not-reside-within-your-vpc-the-lambda-service-vpc-and-the-hyperplane-eni-architecture/https://readjulsmd.com/blog/lambda-does-not-reside-within-your-vpc-the-lambda-service-vpc-and-the-hyperplane-eni-architecture/We first review the standard network architecture of AWS Regions and VPCs, and their inherent network relationships.Fri, 31 Oct 2025 00:00:00 GMThttps://readjulsmd.com/blog/nestjs-vs-spring-which-one-is-better/https://readjulsmd.com/blog/nestjs-vs-spring-which-one-is-better/In web application development, choosing the right framework is crucial. While there are many frameworks available, NestJS and Spring are…Tue, 18 Mar 2025 00:00:00 GMThttps://readjulsmd.com/blog/please-dont-erase-my-image-kubelet-operating-kubernetes-in-a-closed-network/https://readjulsmd.com/blog/please-dont-erase-my-image-kubelet-operating-kubernetes-in-a-closed-network/“This happened recently when we were migrating an existing Docker Compose-based application architecture to Kubernetes. The system we were…Thu, 17 Jul 2025 00:00:00 GMThttps://readjulsmd.com/blog/security-blind-spot-of-docker-proven-by-ai-agents-why-docker-is-being-replaced-by-podman-and/https://readjulsmd.com/blog/security-blind-spot-of-docker-proven-by-ai-agents-why-docker-is-being-replaced-by-podman-and/Recently, a major talking point went viral across the tech community: OpenAI’s AI coding agent, Codex, managed to alter core system…Mon, 01 Jun 2026 00:00:00 GMThttps://readjulsmd.com/blog/styling-your-code-the-conventional-style-guide-for-good-programming/https://readjulsmd.com/blog/styling-your-code-the-conventional-style-guide-for-good-programming/I started programming by reading “Clean Code”, and I’ve almost always applied it in practice since then. By keeping my work clean, I’ve…Mon, 22 Apr 2024 00:00:00 GMThttps://readjulsmd.com/blog/typescript-is-not-typescript-the-trap-of-generic/https://readjulsmd.com/blog/typescript-is-not-typescript-the-trap-of-generic/Something that should never happen in production actually happened.Thu, 15 Jan 2026 00:00:00 GMThttps://readjulsmd.com/blog/why-apps-exist-why-vibe-coding-will-hits-a-dead-end-in-the-end/https://readjulsmd.com/blog/why-apps-exist-why-vibe-coding-will-hits-a-dead-end-in-the-end/We are currently living in the golden age of “Vibe-Coding.” With the advent of LLMs, the barrier to entry for software development has…Sun, 12 Apr 2026 00:00:00 GMThttps://readjulsmd.com/blog/why-did-my-webrtc-connection-fail/https://readjulsmd.com/blog/why-did-my-webrtc-connection-fail/When I was an Android Java mobile application engineer before transitioning to a backend engineer, I once developed a real-time voice…Fri, 14 Mar 2025 00:00:00 GMT