Developers who start with AWS Lambda and other serverless technologies (SQS, EventBridge, Step Functions, …) often wonder how they should test their applications. And it’s not just about testing but more globally about Developer eXperience (DX): One of the main criteria is often the speed, and how they can shorten…

This blog post describes the different pieces of the puzzle needed to unit test a Step Functions state machine defined with CDK code. CDK-defined state machine CDK ? CDK stands for Cloud Development Kit, an open-source framework that allows to define your infrastructure as real code (Typescript, Python, Java, …) not just yaml or json…

This post describes how we simplified our code and improved logging, tracing and metrics collection in our API and Lambda functions, using Lambda Powertools for Java. This second part is focused on logging and metrics. Disclaimer I Love My Local Farmer is a fictional company inspired by customer interactions with AWS…

This post describes how we simplified our code and improved logging, tracing and metrics collection in our API and Lambda functions, using Lambda Powertools for Java. This first part is focused on tracing. Disclaimer I Love My Local Farmer is a fictional company inspired by customer interactions with AWS Solutions Architects…

You may have heard about the critical log4j vulnerability that set the web ablaze mid December 2021. Nicknamed ‘log4Shell’, or more officially ‘CVE-2021–44228’, this vulnerability was scored 10, which is the most critical. Thanks to this vulnerability on the most common logging library in the Java ecosystem, attackers could execute…

I’m currently testing AWS Step Functions direct integration with Amazon API Gateway. The aim is to make an API call directly from my state machine, rather than from an intermediary Lambda function. Eventually, it can improve the performance and possibly reduce the cost too. Let’s have a look. Use case In a…

I recently read an article that gives some reasons not to go with Serverless. I’d like to go through the arguments given in this article (and many others like this one), because there are misunderstandings and misconceptions about Serverless. Fallacy #1: Serverless is the wrong tool for you, if you…

Personal Data in Europe, Personal Identifiable Information (PII) in the US, Client Identifying Data (CID) here in Switzerland, … Whatever the name you give it, the definition is slightly the same: it defines a category of information about an individual that can be used to unambiguously distinguish or trace his/her…