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Hi, my name is Alex. I'm a freelance web developer and engineering manager.

Hide direct object references to increase application security

Whenever a user is about to access certain data within your web application you want to make sure, he has only access his data, not other user's data. A critical measure to prevent vulnerabilities here, is to implement tight authorization checks on a functional level. This is very essential to security and should not be missed. Anyhow, you can increase security further with a fairly simple additional measure.User controlled keysTo access a specific object, like a database record or […]

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Creating a responsive layout based on squares.

Creating a responsive layout based on squares may be more tricky than expected, because it require you to always ensure a given aspect ratio of 1:1. Here are some thoughts on a solution I came up with.Imagine a layout should define a square, that is supposed to be biggest unit. All other elements are fractals of this biggest square, going down to a square that is supposed to be the smallest unit. I tried out various approaches to […]

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Responsive background images with srcset and sizes

A while ago I searched around for a quick and easy solution to provide responsive background images. Somewhere I stumbled upon a fiddle demonstrating an amazingly neat trick. I tried this approach in a few projects and started some cross browser testing. It worked like a charm and I'd like to share and explain this idea.srcset and sizes FTW!The srcset and sizes attributes, which the HTML5 standard specifies for the img tag, are around for a while now. […]

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npm run deploy

Hi there! I'm Alex, a freelance web developer living in Hamburg, Germany. Today is the day to finally publish my new website.I came up with a bazillion of ideas, concepts, layouts, prototypes and finished implementations. Like 99% of them went to the trash bin. In the end I decided to strip it all down to the essentials and put a simple, minimalistic blog in the center.To keep myself sticking to this idea, I didn't even consider some full […]

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