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NestJS Custom Decorators: Metadata, Reflector & Guards

Backend

June 202610 min read

NestJS Custom Decorators: Metadata, Reflector & Guards

The mental model most NestJS tutorials skip: decorators just attach metadata, and guards read that metadata back at request time with Reflector. Once that clicks, custom decorators stop feeling like magic.

Docker BuildKit Cache Mounts: Cut CI Build Times in Half

DevOps

June 20269 min read

Docker BuildKit Cache Mounts: Cut CI Build Times in Half

Package manager installs shouldn't re-download from scratch on every commit. BuildKit cache mounts let npm, apt, pip, and Go caches survive across builds without bloating your final image.

I Built an npm Library for ERP Hierarchical Approval Workflows

Backend

June 202610 min read

I Built an npm Library for ERP Hierarchical Approval Workflows

After rebuilding multi-level approval workflows three times across ERP projects, I extracted the pattern into an open-source TypeScript npm library.

June 202611 min read

Claude Fable 5: What Developers Need to Know

Claude Fable 5 is Anthropic's new Mythos-class model. Here is the pricing math, the API migration gotchas, and who should actually use it over Opus.

Blue-Green vs Canary Deployments on a Budget (No Kubernetes)

DevOps

May 202610 min read

Blue-Green vs Canary Deployments on a Budget (No Kubernetes)

You do not need a service mesh for safe deploys. Blue-green and canary releases work on a single VPS with nginx and Docker Compose — here is how I run both.

What cgroups v2 Really Does When You Set Docker Memory Limits

DevOps

May 202610 min read

What cgroups v2 Really Does When You Set Docker Memory Limits

Docker --memory and --cpus flags are just files in the cgroups v2 tree. Understanding memory.max, cpu.max, and the OOM killer makes your limits predictable.

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