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Software Letters
Sharing insights about Software engineering, Design patterns, AI applications and NoCode tools.
Written by
Houssem BEN SLAMA
Connect
SQS
+7
Oct 15, 2025
•
4 min read
Tracing async workflows, debugging across queues, and the metrics that actually matter—an advanced guide for serverless teams.
AWS
+3
Aug 3, 2025
7 min read
AWS Glue is a fully managed ETL (Extract, Transform, Load) service designed to simplify data integration. It automates much of the effort in building, maintaining, and running ETL jobs by providing a serverless environment, built-in transformation logic, and native integration with other AWS services like S3, DynamoDB, and OpenSearch.
DDD
+4
Oct 3, 2024
12 min read
Adapting the C4 Model for Serverless, Domain-Driven Design (DDD), and Event-Driven Architecture (EDA)
Data-lake
+8
Jul 2, 2024
9 min read
Understanding Apache Kafka’s Architecture, Benefits, and How It Outperforms Other Data Platforms
Kubernetes
Jun 5, 2024
10 min read
From Basic Operations to Advanced Techniques
Containerization
Jun 4, 2024
Unleashing the Power of Containerization and Orchestration for Modern Applications
Global Accelerator
+2
Nov 6, 2026
Global Accelerator gives you two static IPs that enter the AWS network at the nearest edge and fail over between Regions without DNS. We build a two-Region accelerator, break the primary on purpose, time the switch, and cost it. Plan for about an hour and a few dollars.
Architecture at Scale
+1
Discord went from 177 Cassandra nodes to 72 ScyllaDB nodes for trillions of messages, but the change that made the migration safe was a thin Rust layer that merges identical reads and routes every channel to one instance. Here is how the three pieces fit, what each one costs, and how to apply the idea at your size.
Tutorial
Nov 5, 2026
PrivateLink is one-way, per-service connectivity: the consumer gets a network interface in its own subnet, the provider gets a load balancer nobody can route to. We will expose a service from a VPC that has no internet gateway, no NAT and no peering, reach it from another VPC, and cost it. Plan for about 45 minutes and under one dollar.
6 min read
Figma split horizontal sharding into a logical step and a physical step, so the risky part became a feature flag you can roll back in seconds. How colos, view-based shards and the DBProxy query engine fit together, and what each one costs.
Slack
Nov 4, 2026
Slack did not teach its RPC clients to survive a sick availability zone. It kept every service inside its own zone and moved failover to one lever at the edge, pulled in under five minutes with no user-visible errors.
11 min read
Transit Gateway is a regional router you rent by the attachment-hour and the gigabyte. We will build a three-VPC hub with two route tables, prove which VPCs can and cannot talk, and cost it. Plan for about 45 minutes and under one dollar.
Nov 3, 2026
Direct Connect is a physical cable with a billing model on top. We build the cost model, wire a Direct Connect gateway in code, and decide what SLA you are actually buying. Plan for 60 to 90 minutes.
Nov 2, 2026
Build an HTTP API with a JWT authorizer, per-route throttling and access logs, then trigger a 401 and a 429 on purpose. About 60 minutes, well under a dollar if you clean up.
design_patterns
Nov 1, 2026
A decorator wraps an object in another object with the same interface. Here is how it behaves in production code, and the one design decision that bites: the order of the wrappers.
