Andres Moreno Profile Pictrue

Andres Moreno

I'm Andres Moreno, Principal Software Engineer at Tyler Technologies. I focus on serverless techonology in AWS

Drop the layers, bundle up with ESBuild instead

Learn how you can structure your serverless projects to share code between Lambda Functions using ESBuild instead of Lambda Layers.

5-Minute Read

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I’ve seen a lot of posts around the problems that Lambda Layers bring. A very good one is called You shouldn’t use Lambda Layers by AJ Stuyvenberg. In this post AJ explains the myths and cons of using Lambda Layers. What is not easy to find is examples on how to actually get rid of Lambda Layers by using a bundler. In this post we will go through a structure and configuration that allows us to remove Layers by using ESBuild to bundle the dependencies and shared code for our…

How to update Lambda Functions from Common JS to ECMAScript

Follow these 3 steps to update your Common JS Lambda Functions to ECMAScript Modules (ESM)

2-Minute Read

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Version 5.0.0 of the @middy/core package no longer supports Common JS in favor of ECMAScript Modules (ESM). ESM improves performance by 2X as mentioned in this post. Seeing this change prompted me to investigate what needs to be updated to get Lambda functions to be ESM to not fall behind on my dependency versions. In this post, we’ll go through the 3 steps needed to go from Common JS to ESM.

Speed up new serverless application development with customized SAM templates

Learn how you can use custom templates with SAM to speed up initial application setup.

3-Minute Read


As you start setting patterns and best practices within your projects at some point you will want to share these to simplify the lives of other developers.
SAM allows you to initialize projects by using the init command and selecting a template for your project. SAM has built-in templates to generate simple Hello-World starter projects (you can find the list of templates here). These will help you get started and get familiar with how to structure your serverless applications but as your…

How to Run the JavaScript AWS SDK Locally

Learn how to setup locally to run the AWS SDK using SSO and named profiles

3-Minute Read

Engineers working in laptops

When using Access Keys I got used to setting the default profile in my credentials file and it worked just fine. When I began having to manage more accounts and switched to SSO, updating the default profile becomes more of a pain. I will show you a couple of ways to authenticate the SDK using named profiles.

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