All posts
Angular Advanced #3 Dynamic components and ViewContainerRef
A walk-through of patterns for creating components dynamically at runtime. From ViewContainerRef and createComponent to @defer, ngComponentOutlet, CDK Portal, dynamic injectors, and memory management — all in one go.
AWS Advanced #4: API Gateway + Lambda
REST API vs HTTP API differences, Lambda integrations (proxy / non-proxy), routes / methods, authorization (IAM / Cognito / Lambda authorizer), stages / deployments / usage plans — the standard pattern for exposing Lambda over HTTP.
Django Advanced #3: Query optimization — N+1, select_related, EXPLAIN, indexes
From the anatomy of N+1 to select_related/prefetch_related, only/defer, EXPLAIN, indexes, bulk_*, and select_for_update — the performance toolbox of Django ORM.
Docker in Practice #4: Building Images in CI — GitHub Actions and BuildKit Cache
The standard for building and pushing Docker images in GitHub Actions. docker/build-push-action, BuildKit GHA cache (type=gha), multi-arch (amd64+arm64) builds, build-time secrets, and build-time optimization — all in a single workflow.
How LLMs Predict the Next Word — AI Explained for Non-Engineers
Learn how large language models like ChatGPT do not understand text but instead predict the next word by probability, explained so that anyone without a technical background can follow.
K8s Intermediate #7: RBAC / NetworkPolicy / ResourceQuota — Security and Resource Policy
The final post in the K8s Intermediate series. Through [#6](/en/posts/k8s-intermediate-6) we covered the workload operations model — controllers, persistent data, external entry points, resource model, health checks, autoscaling. This post covers the three objects `RBAC`, `NetworkPolicy`, and `ResourceQuota` that fill the last gap of multi-tenant operation, where multiple teams and environments share one cluster. The three dimensions of who can create objects, what traffic flows, and how much can be made are all bundled as namespace-level policy, and the real value of Namespace briefly noted in [Basics #7](/en/posts/k8s-basics-7) is unfolded by these three objects. Since this is the last post in the series, a 7-post retrospective and a preview of the next track (K8s Advanced) is also included.
Modern Python Advanced #5: GIL and concurrency — threading vs multiprocessing vs asyncio
What the GIL is, the role of threading/multiprocessing/asyncio, and the free-threaded build of Python 3.13–3.14 (PEP 703/779) — all in one place.
RHEL Advanced #3: Performance Analysis — sar, top/htop, iostat, vmstat, perf
Where to look first when a RHEL machine becomes slow. Get the first picture with top/htop, see CPU/memory/IO at once with vmstat, drill into disks with iostat, follow time with sar, and find CPU hotspots with perf — all framed by the USE (Utilization, Saturation, Errors) methodology in one cycle.
TypeScript Advanced #1: keyof and typeof
The two most fundamental tools for building types — using keyof to gather keys, typeof to derive types from values, and the patterns that become possible when they meet.
Angular Advanced #2 Signals in depth — computed, effect, model
A deep dive into Signals, Angular's new reactive model. We bring computed, effect, input/output/model, linkedSignal, and the cooperation with RxJS together in one place.
AWS Advanced #3: Lambda Basics
Where Lambda fits (vs ECS / EC2), runtime / handler / event / context, sync vs async invocation, cold start and Provisioned Concurrency, concurrency / limits, logging and monitoring — your first AWS serverless building block.
Django Advanced #2: Custom management commands
From what manage.py actually is, to BaseCommand subclassing, argument parsing, cron integration, call_command, and testing — the full picture of custom commands as one axis of Django operations.