1c:I[13395,["/_next/static/chunks/37xd1r7llq7u4.js","/_next/static/chunks/01c5fuise8oaq.js","/_next/static/chunks/2rh_4bu40l129.js"],"Desktop"] 20:I[27201,["/_next/static/chunks/3fntmmi971322.js"],"IconMark"] 1d:T71a,

Hi, I'm Danny.

I'm 23, I live in Germany and I write software for a living. Most days that means Android and Kotlin at SPEDION, where we build the app truck drivers use all day long: orders, routes, driving times, messages, navigation. If you see a tablet on a truck dashboard telling the driver where to go next, there's a fair chance it's ours.

I got into this through a three-year apprenticeship that started in 2020. In Germany that's called Fachinformatiker für Anwendungsentwicklung, which is a long way of saying "application developer". I stayed after I finished, and since late 2024 I also train the apprentices who started after me. Some of them are barely younger than I am, which is a weird feeling.

After work I build small tools for problems I keep running into. A terminal app for poking at Android devices, a way to set my Slack status without opening Slack, a CSS file that makes websites look like an old tube monitor. Some of it is useful. Some of it is just fun.

I care a lot about privacy. In 2019 I started Slynite with friends because we wanted software that doesn't collect more data than it needs. That's still the idea behind most things I make, including this site: no trackers, no analytics, no cookie banner.

When I'm not at a keyboard I'm probably out hiking, taking photos, or watching cars go fast.

How to use this computer

Double-click things. Open the menus. Drag windows around by their title bars. There's a Trash, and yes, you can empty it.

If you want to talk about a job, a project or just say hi, open Mail and send me a message.

1e:T4a5,

Training apprentices, I kept seeing the same thing: people watch a tutorial, nod along, and a day later can't write the code themselves. dot. is my answer to that.

There are no videos. A lesson works more like a conversation: first you predict what a piece of code will print, then you write code yourself, then a short comprehension check. You only move on when it actually sticks.

The first track is Kotlin: 12 courses and 111 lessons, from your first println to generics, coroutines, testing, Gradle and what the JVM and the compiler do under the hood. The courses build on each other, and at the end of the track there's a certificate with your name on it.

There's also an AI helper, called dot as well. You can ask it about the lesson, it gives feedback on your predictions and hands out hints. But it sticks to the course material, links its sources, and it won't give you the solution. Before you get a hint, you have to write down what you've tried and where exactly you're stuck. Surprisingly often, that alone solves it.

It's free, you don't need an account, and your progress stays on your device. Available in English and German.

1f:T487,

At work I plug a lot of Android devices into my laptop. Tablets that live in truck cabs, test phones, emulators. And every time I needed something slightly unusual, I ended up googling the same adb commands again.

So I wrote a toolbox. It's a TUI built with Bubble Tea: actions on the left, output on the right. It downloads its own copies of adb and scrcpy, so it works on a fresh Windows laptop without anyone installing the Android SDK first. Honestly, that part was more work than the UI.

What I like about it:

Actions live in a plain actions.yaml. A new action is a few lines, no Go needed.
You can describe an action in plain English and it writes the YAML for you through the Claude Code CLI. I was skeptical. It's actually handy.
Emulator controls for faking GPS positions and battery levels, which you need a lot when you work on navigation.
It reads APK metadata without any external tools.
English and German UI.

It runs on Windows, macOS and Linux, arm64 included. Getting unsigned binaries past Gatekeeper and SmartScreen deserves its own blog post.

14:[["$","script",null,{"type":"application/ld+json","dangerouslySetInnerHTML":{"__html":"{\"@context\":\"https://schema.org\",\"@type\":\"Person\",\"name\":\"Danny Schapeit\",\"url\":\"https://dannys.computer\",\"email\":\"mailto:danny@schapeit.com\",\"jobTitle\":\"Software Engineer\",\"worksFor\":{\"@type\":\"Organization\",\"name\":\"SPEDION GmbH\"},\"address\":{\"@type\":\"PostalAddress\",\"addressCountry\":\"Germany\"},\"knowsAbout\":[\"Kotlin\",\"Android\",\"Jetpack Compose\",\"Java\",\"TypeScript\",\"Next.js\",\"C# / .NET\",\"Go\",\"SQL\",\"Docker & Kubernetes\",\"CI/CD & GitOps\",\"OAuth & OpenID Connect\",\"Linux\",\"Git\"],\"sameAs\":[\"https://github.com/d3nn7\",\"https://www.linkedin.com/in/danny-schapeit-a23b5a232\",\"https://dannys.computer/wallpaper\",\"https://bsky.app/profile/schapeit.com\",\"https://instagram.com/glaubedanny\",\"https://dev.to/d3nn7\",\"https://slynite.com\"]}"}}],["$","$L1c",null,{"content":{"site":{"name":"Danny Schapeit","firstName":"Danny","handle":"d3nn7","age":23,"role":"Software Engineer","company":"SPEDION GmbH","location":"Germany","email":"danny@schapeit.com","url":"https://dannys.computer","title":"Danny's Computer","description":"Danny Schapeit, 23, software engineer from Germany. Android and Kotlin at SPEDION during the day, Go tools, privacy stuff and an old Mac in the browser after hours.","tagline":"Android at work. Weird little tools after hours.","languages":[{"name":"German","level":"native"},{"name":"English","level":"daily at work, no problem"}]},"about":{"title":"Read Me","html":"$1d"},"now":{"title":"Now","updated":"2026-09","html":"

What I'm up to right now:

Android work at SPEDION, as usual
Adding new actions to android-toolbox whenever I catch myself typing the same adb command twice
Walking the new apprentices through their first code reviews
Building a mail client, very slowly
This website, obviously

"},"links":[{"id":"email","title":"Email","href":"mailto:danny@schapeit.com","label":"danny@schapeit.com","note":"Jobs, projects, questions. I read everything.","icon":"mail","featured":true},{"id":"github","title":"GitHub","href":"https://github.com/d3nn7","label":"@d3nn7","note":"Side projects, experiments, the occasional PR.","icon":"branch","featured":true},{"id":"linkedin","title":"LinkedIn","href":"https://www.linkedin.com/in/danny-schapeit-a23b5a232","label":"Danny Schapeit","note":"The serious version of this page.","icon":"badge-in","featured":true},{"id":"wallpaper","title":"Retro Wallpapers","href":"https://dannys.computer/wallpaper","label":"dannys.computer/wallpaper","note":"Take this desktop with you. For your phone, laptop or story.","icon":"wallpaper","featured":true},{"id":"bluesky","title":"Bluesky","href":"https://bsky.app/profile/schapeit.com","label":"@schapeit.com","note":"Quiet, but I'm there.","icon":"butterfly","featured":false},{"id":"instagram","title":"Instagram","href":"https://instagram.com/glaubedanny","label":"@glaubedanny","note":"Photos I took, mostly outside.","icon":"camera","featured":false},{"id":"devto","title":"dev.to","href":"https://dev.to/d3nn7","label":"@d3nn7","note":"One blog post so far. More coming. Probably.","icon":"badge-dev","featured":false},{"id":"slynite","title":"Slynite","href":"https://slynite.com","label":"slynite.com","note":"The privacy-first open source thing I started with friends.","icon":"lock","featured":false}],"skills":[{"name":"Kotlin","set":"Mobile","icon":"badge-kt","since":2020,"comfort":"daily driver","note":"What I write most days. Coroutines, Flows, and a strong opinion about the !! operator.","locked":false},{"name":"Android","set":"Mobile","icon":"robot","since":2020,"comfort":"daily driver","note":"Production apps that run in truck cabs all day, on hardware you really can't choose.","locked":false},{"name":"Jetpack Compose","set":"Mobile","icon":"layers","since":2022,"comfort":"getting there","note":"I can build real screens with it, but I still look things up a lot. Most of what I know comes from DocScan.","locked":false},{"name":"Java","set":"Mobile","icon":"coffee","since":2019,"comfort":"fluent","note":"My first real language. Still around in older parts of the codebase, so still around in my head.","locked":false},{"name":"TypeScript","set":"Web & Backend","icon":"badge-ts","since":2021,"comfort":"fluent","note":"For anything that runs in a browser, including this site.","locked":false},{"name":"Next.js","set":"Web & Backend","icon":"badge-n","since":2022,"comfort":"fluent","note":"Internal dashboards at work, most of my web side projects, and the computer you're looking at.","locked":false},{"name":"C# / .NET","set":"Web & Backend","icon":"badge-cs","since":2021,"comfort":"comfortable","note":"Backend services and APIs at work. .NET 8 in containers these days.","locked":false},{"name":"Go","set":"Web & Backend","icon":"badge-go","since":2025,"comfort":"learning fast","note":"My language for CLI and TUI tools. android-toolbox and the Slack tools are written in it.","locked":false},{"name":"SQL","set":"Web & Backend","icon":"database","since":2020,"comfort":"comfortable","note":"Enough to write the query myself and know when to ask someone who's better at it.","locked":false},{"name":"Docker & Kubernetes","set":"Infrastructure","icon":"boxes","since":2022,"comfort":"comfortable","note":"Helped set up Kubernetes at work and put a bunch of .NET services into containers.","locked":false},{"name":"CI/CD & GitOps","set":"Infrastructure","icon":"loop","since":2023,"comfort":"comfortable","note":"Build pipelines and automated deployments. If I have to do it twice by hand, it should be a pipeline.","locked":false},{"name":"OAuth & OpenID Connect","set":"Infrastructure","icon":"key","since":2024,"comfort":"comfortable","note":"Login flows on Android, iOS and backend, including one big migration where the goal was that nobody notices.","locked":false},{"name":"Linux","set":"Everyday","icon":"penguin","since":2019,"comfort":"fluent","note":"Servers, containers, and the reason I know way too many shell shortcuts.","locked":false},{"name":"Git","set":"Everyday","icon":"branch","since":2019,"comfort":"fluent","note":"Rebase fan. I will ask you to write a proper PR description.","locked":false},{"name":"Coffee","set":"System","icon":"coffee","since":2020,"comfort":"required","note":"Required system component. Cannot be disabled.","locked":true}],"trash":[{"name":"portfolio-98.exe","kind":"application","size":"1.4 MB","message":"My old website was a Windows 98 desktop. It served me well. We don't talk about it anymore."},{"name":"node_modules","kind":"folder","size":"4.2 GB","message":"Still being moved to the Trash. Estimated time remaining: about 3 business days."},{"name":"final_FINAL_v3.fig","kind":"document","size":"88 KB","message":"There was a v4. And a v5. This one is not final."},{"name":"TODO.txt","kind":"document","size":"2 KB","message":"1. Finish website 2. Write more blog posts 3. Clean up the Trash (1 of 3 done)"},{"name":"quick-fix.patch","kind":"document","size":"12 KB","message":"Famous last words. It was not quick and it did not fix it."},{"name":"printer-drivers","kind":"folder","size":"700 MB","message":"No printer in this house has ever worked on the first try. This folder is proof."}],"experience":[{"role":"Apprentice Trainer","org":"SPEDION GmbH","orgUrl":"https://www.spedion.de","start":"2024-11","tags":["Mentoring","Code Reviews","Teaching"],"slug":"spedion-trainer","html":"

Next to my regular job I train our application development apprentices. Code reviews, small practice projects, and a lot of explaining why the build is red. Some of my training material is on GitHub (in German).

For the Kotlin basics I built dot., a free learning platform where apprentices write the code themselves instead of watching someone else do it.

"},{"role":"Software Engineer","org":"SPEDION GmbH","orgUrl":"https://www.spedion.de","start":"2023-07","tags":["Kotlin","Android","Jetpack Compose","C#/.NET","Next.js","Kubernetes","OAuth"],"slug":"spedion-engineer","html":"

Android and full-stack work on SPEDION's telematics platform. Mostly Kotlin, some Java, and C#/.NET or Next.js whenever the task needs it. Features, bug fixes, UI work, auth, deployments. Whatever keeps the trucks moving.

Main SPEDION app: ongoing feature development, bug fixes, UI improvements, dark mode
Navigation app: ongoing feature development and bug fixes, core components, notification engine
DocScan: started the development and the first Compose UI, then finished it together with coworkers
Login migration across Android, iOS and backend
Kubernetes and deployment automation together with the team

"},{"role":"Co-Founder","org":"Slynite","orgUrl":"https://slynite.com","start":"2019-02","tags":["Open Source","Privacy","Product"],"slug":"slynite","html":"

A small open source project I started with friends. The idea: apps that only collect the data they actually need. So far that's been a travel guide, a time tracker, a link-in-bio service, and now a JMAP mail client. It's a side thing, but it's where I learned most of what I know about building a product from zero.

"},{"role":"Apprenticeship, Application Development","org":"SPEDION GmbH · Berufsschule Obernburg","start":"2020-09","end":"2023-07","tags":["Java","C#","Web","Android"],"slug":"spedion-apprenticeship","html":"

Three years in the German dual system: most of the week writing real code at SPEDION, the rest at vocational school for the theory. Finished as Fachinformatiker für Anwendungsentwicklung, which translates to IT specialist for application development.

"}],"projects":[{"title":"SPEDION App","kind":"work","year":"2023–now","icon":"truck","order":1,"stack":["Kotlin","Java","Android"],"summary":"The telematics app truck drivers use all day. Orders, routes, driving times, messages, documents.","links":[{"label":"spedion.de","href":"https://www.spedion.de"}],"slug":"spedion-app","html":"

The main product at SPEDION and where I spend most of my time. It runs on tablets and phones in truck cabs and covers pretty much a driver's whole day: orders and routes, driving and rest times, messages with dispatch, documents, navigation.

I'm very active in this project: new features, bug fixes, UI work, whatever comes up. One thing I'm really happy I got to do: dark mode. Doesn't sound like much until you picture a driver looking at a bright white screen at 3 a.m. on the Autobahn.

Working on software that runs inside moving trucks changes how you think about releases. You can't just hotfix a truck that's parked somewhere with one bar of signal.

"},{"title":"SPEDION Navigation","kind":"work","year":"2023–now","icon":"map","order":2,"stack":["Kotlin","Android"],"summary":"Navigation for trucks. I work on it all the time, from new features and bug fixes to the notification engine.","links":[],"slug":"spedion-navigation","html":"

Navigation for trucks is its own thing. Height and weight limits, roads you're not allowed to take, and drivers who really don't want surprises.

I'm one of the people who are in this codebase pretty much every week. I build new features, fix bugs and helped build core parts of the app.

The part I'm proudest of is the notification engine: it decides which hints a driver gets along the route, when to show them, and how to show them without getting in the way of someone driving 40 tonnes.

"},{"title":"SPEDION DocScan","kind":"work","icon":"scanner","order":3,"stack":["Kotlin","Jetpack Compose","Android"],"summary":"Document scanning for drivers, so the paperwork gets to the office before the truck does.","links":[],"slug":"docscan","html":"

Drivers deal with a lot of paper: delivery notes, freight documents, receipts. DocScan turns their phone into a scanner so the paperwork reaches the office before the truck does.

I started the development and built the first core features and UI flows in Jetpack Compose. Around the halfway point more coworkers joined and we finished it as a team.

It was my first bigger Compose project, so I learned a lot of it on the way. I'm not a Compose wizard, but I get things done with it.

"},{"title":"Login Migration","kind":"work","icon":"key","order":4,"stack":["OAuth 2.0","OpenID Connect","Android","iOS",".NET"],"summary":"Moving our apps to a new login system across Android, iOS and backend, without locking anyone out.","links":[],"slug":"auth-migration","html":"

Migrating auth is one of those jobs where the best possible outcome is that nobody notices anything. We moved our apps to a new identity provider, and I worked on the changes on Android, iOS and the backend.

The hard part wasn't the new login, it was the switch-over. Apps out on the road update whenever they update, so the move had to happen without anyone suddenly getting logged out in the middle of a shift.

"},{"title":"Kubernetes & Deployments","kind":"work","year":"2023–now","icon":"wheel","order":5,"stack":["Kubernetes","Docker",".NET","CI/CD"],"summary":"Helping the team move our services into containers on Kubernetes and automate how they get deployed.","links":[],"slug":"kubernetes","html":"

Not what you'd expect an Android dev to be doing, but I like knowing where my code ends up.

Together with a few colleagues I helped set up our Kubernetes environment, containerized .NET services that had never seen a Dockerfile before and worked on automating deployments. The migration is ongoing, as migrations always are.

"},{"title":"Monitoring Dashboard","kind":"work","icon":"chart","order":6,"stack":["Next.js","TypeScript","C#","ASP.NET"],"summary":"An internal web dashboard that turns system alerts into something humans want to look at.","links":[],"slug":"monitoring-dashboard","html":"

Monitoring tools are great at knowing that something is wrong and not so great at telling you nicely.

I built an internal dashboard with a Next.js frontend and a C# API behind it. It collects the alerts, sorts them and shows the ones that actually need attention, in a way that doesn't make you want to close the tab.

"},{"title":"dot.","kind":"side","year":"2026","icon":"dot","order":0,"status":"Live, free","stack":["Next.js","TypeScript","AI","Kotlin"],"summary":"A free learning platform for apprentices. Predict, write the code yourself, and only move on when it sticks. With an AI tutor that won't hand out solutions.","links":[{"label":"Open dot.","href":"https://onboarding.meinazubi.space"}],"slug":"dot","html":"$1e"},{"title":"Android Toolbox","kind":"side","year":"2026","icon":"terminal","order":1,"stack":["Go","Bubble Tea","adb","scrcpy"],"summary":"A terminal app for doing things to Android devices without googling adb flags every time.","links":[{"label":"GitHub","href":"https://github.com/d3nn7/android-toolbox"}],"slug":"android-toolbox","html":"$1f"},{"title":"Slack Status TUI","kind":"side","year":"2026","icon":"terminal","order":2,"stack":["Go","Bubble Tea","Lip Gloss","Slack API"],"summary":"Set your Slack status from the terminal, because opening Slack is how you lose 20 minutes.","links":[{"label":"GitHub (TUI)","href":"https://github.com/d3nn7/slack-tui"},{"label":"GitHub (CLI)","href":"https://github.com/d3nn7/slack-status-cli"}],"slug":"slack-status","html":"

Opening Slack just to set my status to \"lunch\" usually ended with me reading three threads and forgetting about lunch. This fixes that.

It's a small Go TUI. Set a custom status with text and emoji, save templates like \"In a meeting\" or \"Focus time\", and apply them with a couple of keystrokes. There's a plain CLI version too, if you want to call it from scripts.

Small project, but a good excuse to get properly into Go and the Charm libraries.

"},{"title":"CRT.css","kind":"side","year":"2021","icon":"crt","order":3,"stack":["CSS","HTML"],"summary":"Makes any website look like it's running on an old tube monitor. Somehow my most-starred repo.","links":[{"label":"GitHub","href":"https://github.com/d3nn7/crt-css"},{"label":"Demo","href":"https://d3nn7.github.io/crt-css/"}],"slug":"crt-css","html":"

A bit of CSS that adds scanlines, some flicker and that slight color fringing you got on old CRT screens. Drop it on a page and it looks 30 years older.

I made it in 2021 after falling into a CodePen rabbit hole (credit to Patrick H. Lauke, whose pen got me started). It's still my most-starred repo on GitHub with 65 stars, which tells you what people actually want from me. Not my Android code. Scanlines.

"},{"title":"Slynite Mail","kind":"side","year":"2026","icon":"mail","order":4,"status":"Early days","stack":["Kotlin Multiplatform","Compose Multiplatform","Rust","SQLDelight"],"summary":"A JMAP email client for Android, iOS, desktop and web. Very much a work in progress.","links":[{"label":"GitHub","href":"https://github.com/Slynite/mail"}],"slug":"slynite-mail","html":"

Most email apps are either nice to use and hungry for your data, or private and stuck in 2004. I'd like one that's both.

Slynite Mail talks JMAP instead of IMAP and is written with Kotlin Multiplatform and Compose Multiplatform, so the same code runs on Android, iOS, desktop and the web. The JMAP part comes from a Rust library with Kotlin bindings, which is a great way to find out how little you know about native interop.

It's early. The architecture is in place (Decompose, MVI, SQLDelight for the local cache) and the MVP list is long. If you know JMAP and want to help, send me a message.

"},{"title":"Travelventures","kind":"side","year":"2021–2022","icon":"map","order":6,"status":"On ice","stack":["Android","JavaScript","Node.js","Appwrite"],"summary":"A travel guide for your pocket that doesn't track where you go. Our first real Slynite project.","links":[{"label":"GitHub","href":"https://github.com/travelventures"}],"slug":"travelventures","html":"

A travel guide that doesn't track your location. A bit ironic for a travel app, and exactly the point.

We built an Android app, a web app with a map of all the places, a small public API for the location data and the backend around it. I worked on pretty much every part of it with a friend from the Slynite team.

It started as a prototype in June 2021 and taught me more about shipping software than any tutorial: auth, data modelling, and how long it takes to agree on a single map marker. The project is on ice now, but the code is all on GitHub.

"},{"title":"Worktime Tracker","kind":"side","year":"2022–2023","icon":"clock","order":7,"status":"Archived","stack":["Next.js","Tailwind CSS","Recoil","Appwrite"],"summary":"A time tracker for the browser, built with Jonas as a school project that got a bit out of hand.","links":[{"label":"GitHub","href":"https://github.com/Slynite/worktime-tracker"}],"slug":"worktime-tracker","html":"

A vocational school project that got a bit out of hand. Jonas Bott and I built a browser-based time tracker: create projects, log hours, see where your week went. Next.js and Tailwind in the front, Appwrite for auth and data.

It never reached 1.0. But it was the first time I worked on a codebase with someone else using real pull requests and reviews, and I've been annoyingly strict about PR descriptions ever since.

"},{"title":"Copilot Theme for GitKraken","kind":"side","year":"2023","icon":"palette","order":8,"stack":["JSON","Color theory (a little)"],"summary":"A GitKraken theme in GitHub Copilot colors, so my Git client finally matched my editor.","links":[{"label":"GitHub","href":"https://github.com/d3nn7/gitkraken-copilot-theme"},{"label":"Blog post","href":"https://dev.to/d3nn7"}],"slug":"gitkraken-theme","html":"

I use GitKraken for Git, and back then my editor ran GitHub's Copilot colors. Switching between the two felt like walking from a dark room into a supermarket. So I made a theme.

I also wrote a post about it on dev.to. It's my only blog post so far, so if you've been waiting for the sequel, same.

"},{"title":"Danny's Computer","kind":"side","year":"2026","icon":"happy-computer","order":9,"stack":["Next.js","TypeScript","CSS","Markdown"],"summary":"This website. An old Mac that runs in your browser, built from scratch.","links":[{"label":"GitHub","href":"https://github.com/d3nn7/dannys.computer"}],"slug":"dannys-computer","html":"

You're using it right now. My previous site was a Windows 98 desktop, so this is either an upgrade or a downgrade, depending on who you ask.

Everything here is built from scratch: the window manager, the menus, the icons (drawn pixel by pixel), Paint, the puzzle. All the text lives in Markdown and YAML files, the contact form uses a small proof-of-work instead of a captcha, and there's no tracking at all.

Things to try:

Drag a window by its title bar, then double-click the title bar
Turn on balloon help in the menu on the far right
Change the desktop pattern in the Control Panel
Empty the Trash
Find the debugger, then type passgen

"}]},"initialWindows":["paint"]}]] 17:null

Danny Schapeit, software engineer from Germany