Note
The Serverless Migration Decision: Cold-Start and Vendor Lock-in
Before you move to FaaS: the real cost of cold-start latency, vendor lock-in risk, and the workloads where serverless actually pays off
sade.dev
A notebook on backend and systems engineering.
sade.dev — I write about production lessons, architecture decisions, database, server and application patterns, and AI-assisted engineering. Notes on one side, small but useful developer tools on the other.
Notes
Production notes and short technical explainers.
Note
The BFF Pattern: A Separate API Layer for Mobile and Web
Separate API layers for mobile and web: the hidden cost of bending one API to fit every client, and when a BFF is actually warranted
Note
Synchronous or Asynchronous? The Line Between HTTP and the Queue
Should a job run inside the HTTP request or go to a queue? The decision line, drawn through response time, fault tolerance, and consistency
Systems
Full architecture breakdowns.
System
Transactional Outbox: Dual-Write, At-Least-Once, and Idempotent Consumption
Writing to the database but failing to put the event on the queue: closing dual-write with an outbox, suppressing the at-least-once repeats it creates, and encrypting the field.
System
GPU FinOps with eBPF
Why GPU spend is invisible to cgroup and cAdvisor metrics, and how eBPF attributes GPU time and memory to teams for chargeback — with the honest limit at the CUDA boundary that DCGM has to cover.
Tools
Developer tools that run entirely in your browser.
Tool
Base64 Encoder / Decoder
Encode and decode text with Base64. Supports the URL-safe variant. Unicode-aware.
Tool
JSON Formatter
Format and minify JSON. Runs in your browser, your data never leaves it.
Tool
JWT Decoder
Decodes the header and payload of a JSON Web Token. Does not verify the signature
Tool
Password Generator
Cryptographically secure password generator with adjustable length and character classes. Runs in your browser.
Journal
Decision logs and opinion pieces.
Journal
Your Architecture Decisions Rot Because Nothing Runs Them
An architecture decision written in a wiki is a wish. The boundaries you can't enforce are the ones that quietly erode — until the diagram stops matching the code. Make the rule executable
Journal
AI Didn't Remove the Bottleneck — It Moved It
Cheap code production doesn't raise throughput if review, integration, and verification can't keep up. The bottleneck just moves downstream — and that's where the work now is
Stack
The tools and server setup I use in production.
MySQL PostgreSQL MongoDB ElasticSearch Redis RabbitMQ Kafka Nginx Docker Cloudflare AWS GCP Github Actions Jenkins Supervisor