Playful systems, built with care

I am Tobias Sauer, a web developer from the Black Forest. TOSA is where I share my projects, tools and notes.

I work on the planning, design and development of websites, web apps and automation.

What I build

The work usually lives where content, interfaces, and small systems meet. Clear enough to use, solid enough to maintain.

Websites with structure
Editorial and business sites with clear content models, careful typography, and a frontend that does not fight future changes.
Web apps and tools
Focused product surfaces, dashboards, and internal tools that make repeated work easier instead of adding another noisy layer.
Automation and integrations
Browser helpers, scripts, APIs, and glue systems that remove manual steps while staying understandable.

I work through the requirements, build a first version and develop it further with feedback.

01
Find the real shape
I map the task, audience, constraints, and edge cases before polishing anything.
02
Build the useful core
I keep the first version narrow enough to test, but structured enough to grow.
03
Tune the feeling
Performance, spacing, copy, and motion get refined together because they shape trust together.
04
Leave it maintainable
The result should be readable, documented where it matters, and stable after the launch moment.

There are a few things to try right here on this site.

Homepage
The easel
The four buttons on the homepage change what appears on the canvas.
Minigame
Lemon break
There is a small game at the bottom of every page. Bother the lemons long enough and they fight back.
Projects
Small tools
The project list also has browser extensions and plugins to try.

Tell me what you have in mind and where you could use a hand.