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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
Stripe
+1
Nov 9, 2026
Stripe moved hundreds of millions of Subscriptions out of the Customer record without a maintenance window. The lesson is not the dual write: it is how each phase was made observable, reversible and proven against production before the next one started.
+2
SQS is a queue that never loses a message and will happily hand it to you twice. We build a queue with a dead-letter queue, an idempotent consumer, and a redrive, and we cost it. Plan for about 40 minutes and pennies.
Shopify
Nov 8, 2026
Shopify kept one Rails application with 2.8 million lines of Ruby and enforced domain boundaries with a static checker that only lets the number of violations go down. Here is how the ratchet works, what it costs, and how to size it for one, ten or a hundred teams.
Cloud Map
8 min read
A definition-first tour of Cloud Map (namespaces, services, instances, health), a boto3 build that registers three instances and filters them by attribute, and the ECS wiring that quietly creates all of this for you.
Nextjs
Nov 7, 2026
6 min read
Next.js shipped 16.4.5 and 15.5.29 on November 3 to fix seven issues. Read together, four of them say one thing about caches that infer their own keys, and it changes what you should audit.
design_patterns
A facade gives a tangle of classes one front door and one failure contract. The pattern is easy to write and easy to ruin. Here is a checkout facade you can run, the test that tells you whether yours is real, and the escape hatch most facades forget.
Tutorial
VPC Lattice is the layer-7 network you attach to VPCs instead of running sidecars. We build a service network, a Lambda-backed service, an IAM auth policy and a signed client call. Plan 60 to 90 minutes, about $0.05 of AWS spend.
Airbnb
Airbnb kept payments at 99.999% consistency while volume doubled by splitting every payment call into three phases, refusing replica reads, and sharding on the idempotency key. Here is how the Orpheus design works and what it costs.
Global Accelerator
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.
