Products & interfaces
Useful web and mobile experiences, from the first sketch to the last detail.
INDEPENDENT SOFTWARE ENGINEER
Complex problems.
Simple software.
I’m Guillaume. I build products, connect systems, and make the complicated feel obvious.
Let’s make it simpleOne person. Direct conversation. Worldwide.
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01 WHAT I DO
From the interface
to the infrastructure.
The whole picture, with just the pieces you need.
Backends & data
APIs, integrations, and data flows that make your systems work together.
Cloud & infrastructure
Reproducible environments, reliable delivery, and fewer moving parts.
AI & automation
Practical tools that take repetitive work off your plate.
A FEW TOOLS IN THE BOX
- Python
- TypeScript
- Svelte
- PostgreSQL
- Nix
- Rust
02 HOW I WORK
Less friction.
More getting things done.
Simple is a choice. Here’s what that looks like.
Talk to the builder.
You work directly with me. The person listening is the person writing the code.
Reduce before adding.
Question the complexity. Keep what helps. The best dependency may be the one you don’t need.
Leave it understandable.
Clear code, deliberate choices, and software you can keep working on.
03 WHO’S BEHIND THIS
Small by design.
KissCo is me, Guillaume Jeusel. A software engineer with a soft spot for thoughtful tools and straightforward solutions. The name is also the idea:
KISS Keep It Simple, Stupid.
CO Company. Just the one human, though.
I take your software seriously. My portrait, less so.
START WITH A CONVERSATION
jeusel.guillaume@gmail.com
A rough idea is a perfectly good starting point.