Engineering Blog
Stories from our daily work.
Knex.js promise resolution decoded
This article explains some details on the Knex.js QueryBuilder interface and their impacts.
Gradually migrating a web application from AngularJS to Vue
How we migrated our SaaS Management Platform (SMP) from AngularJS to Vue without blocking development.
Reacting to security alerts
A walkthrough how we reacted to a security alert and how we handled it.
Integration tests in Node.js and Jest
How to do integration testing within a Node.js service with Jest
How to build reactive Angular Components using Inputs as Observables
Why and how we are building reactive Angular components with the help of TypeScript decorators by redefining inputs as observables.
Ship features faster by introducing an OpenAPI code generator
We want to focus on what we love doing - shipping great features to our customers. In this blog post, we explain how an OpenAPI client code generator supports us in achieving this goal. We also show how we've integrated it into our build pipeline.
Jupyter Notebooks are a shell replacement
An attempt to provide another measure for the decision when to use Jupyter notebooks – and when not.
The Builder Design Pattern in Kotlin
How to implement and use the builder design pattern in Kotlin and what different language features you can use
Hello WeAreDevelopers Berlin 🥳
From June 14th to 15th we're at the WeAreDevelopers conference in Berlin. Come meet us at our booth!
Scalable job processing with KEDA in Kubernetes
KEDA is a Kubernetes-based Event Driven Autoscaler. In this blog, you will see how we migrated a legacy integration service into Kubernetes and use KEDA for scaling. It explains a solution for short and long-running jobs that responds fast, is running resilient against deployments, and will be controlled based on load.
Halve Your GitHub Actions Bill
How we switched from "push" to "pull_request" event triggers in our workflows to reduce the GitHub Action minutes spent on feature branches significantly.
How to migrate from jasmine to jest
This is a guide to replace the jest-jasmine2 runner with the jest-default runner. Additionally, you will find a cheat sheet to write tests without using jasmine.
Component tests in Node.js and Jest
How to do component testing within a Node.js service with Jest
Scaling Infrastructure Provisioning
Finding the balance between team autonomy and having an infrastructure team is hard. This post shares our approach to having a dedicated infrastructure team, while enabling product engineering teams to quickly provision their required infrastructure via a simple API.
LeanIX Engineering Values
The values that we live by and strive for at LeanIX.
Prefix Search in Node.js using Knex.js and PostgreSQL
How to create a prefix search in a Node.js service using Knex.js and a Postgres database
Comparing Fact Sheets using Graph Convolutional Networks
How to make Fact Sheets comparable using Graph Neural Networks
Building accessible web applications: What, Why, Who and How
An attempt to raise awareness of a topic that should be important to anyone building user interfaces for humans.
A less expected way JPA metamodel generation can fail
A banal story about what went suddenly wrong in the annotation processor step that generates source code for JPA metamodel classes. This might be helpful to quicker get out of similar situations.
How we sped up CI checks in our nx monorepo
By combining the "nx affected" and "nx dep-graph" commands we were able to reduce the number of projects to check in our continuous integration runs. The code is available as a reusable GitHub Action for your nx monorepo.
Migrating from Stylus to SCSS at scale
Web applications often use CSS preprocessors. In this post, we share how we managed to migrate from Stylus to SCSS in an Angular monorepo.
How to procrastinate jobs successfully
This post is about how we moved from a cronjob to a python based task queue and the learnings we had on the way.
Ode to Kanban
Defining and measuring business outcomes is one of the most important challenges we need to tackle in order to sustainably generate value. Kanban holds a lot for agile software development and is worth having a look at.
Our sprint retrospectives are fun!
Find out how we made sprint retrospectives interesting by involving everyone in the team and overcame work-from-home blues
All you need to know about CSRF attacks
Cross-Site Request Forgery (CSRF) is an attack that forces an end user to execute unwanted actions on a web application. Find out why the CSRF is still a threat, the concepts related to it and how to protect your users.
Why software has bugs – explained with kids
Have you ever wondered what bugs are, why they love to sneak into software but you're not a software developer yourself?
Why TypeScript is awesome for SQL queries
Utilizing the type system to precisely and concisely model SQL queries.
Integration API Visualiser
Integration API Visualiser is an experimental project to demonstrate an alternative UI for Integration API. The goals of the experiment is to improve readability of large, complex Integration API processors
Lessons learned from a major Angular migration
Migrations in mature software projects can be challenging. This post shares some guidelines and best practices that work for us.
Pattern Matching vs. Polymorphism
Comparing two architectural approaches and when to favor one over the other.