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  • By Stefan Judis
    How to control and record voice calls with Node.js serverless functions Graphic showing Twilio call flow with serverless functions

    There are many ways to communicate with your friends and family. You might use good old SMS, Whatsapp, emails and of course phone calls. Recently, I came across a surprising new way of communication. It all started with my friend Michaela asking a question on Twitter.

    Would it be possible to generate an RSS feed out of Twilio voice calls?

    What she was looking for was a way to transform phone calls into an RSS feed referencing the recorded phone call. Why? Because she listens to many podcasts and sends very long voice messages to one of her friends via Whatsapp. As these messages usually don’t need a timely response, they both would prefer all the voice messages appear in their podcatchers rather than Whatsapp.

    Let me introduce you to the idea of “PodBot - the surprise podcast from your friends”.

    Podbot preview in a browser window

    The idea is a follows: All you have to ...

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  • By Stefan Judis
    HTTP headers for the responsible developer Hero image - http headers for the responsible developer

    This article is a written version of the talk “HTTP headers for the responsible developer”. You can check the slides or the recording.

    Being online is the default state for many people these days. We all spend our time shopping, chatting, reading articles, and looking for information like directions. The web connects us with the whole world, but most certainly the web connects people. I myself have been using the web now for 20 years, and my relationship to it changed eight years ago when I became a web developer.

    Developers connect people.
    Developers help people.
    Developers enable people.

    Developers have the power to build the web for everyone, but that power needs to be used responsibly. What matters, in the end, is building things that help and enable people.

    In this article, I want to share how HTTP headers can help you build better products for a better web ...

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  • By Stefan Judis
    How to send text messages from your static site using Netlify, Twilio and serverless functions How to send messages with Twilio and Netlify

    It’s exciting times to be a Frontend developer. With the rise of modern technologies such as serverless functions, Frontend engineers can do things that usually only backend engineers could do. This entails deploying scalable sites, sending emails, or creating HTTP endpoints. Due to the power of new service providers and countless APIs, building performant applications has become rather a game of connecting dots than building everything from the ground up.

    In this article, I want to share how you can create and deploy a scalable static site on Netlify and how you can use serverless functions to send text messages using Twilio.

    Screenshot of

    You can see the final result on You can go there and tell me how much you love the good old 8-bit style via SMS. If you want to set-up a site similar to “8-bit revolution” you can have a look at the project ...

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  • By Stefan Judis
    Introducing Twilio Developer Evangelist Stefan Judis Stefan Judis (2).jpg

    It’s a Sunday morning in Berlin, and I’m standing in front of a local co-working space. With me, there’s a man in his fifties. He apologizes for leaving the free workshop I helped organize earlier. We chat about the weather, life, and Berlin. It turns out he’s a Math professor at a very well known German university. He changes the topic and starts asking me a few questions.

    “May I ask you something? Why are you doing this? It’s a lovely Sunday morning, and you just taught me my first lines of JavaScript.”

    Why am I doing this? And how did I get here?

    The professor was right — why am I doing this?

    A few years back, my day job was to sit in front of large audio mixers. I was responsible for the sound of German television shows. It was a lot of fun ...

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