Jan Kaiser portrait

Hello.

My name is Jan.

And I
make software.

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But software is not just <code><code>.

CTO
We're going to hit 10x traffic next quarter. Can we just rewrite the entire backend in Rust?
No.
CTO
...okay. So what's the plan?
Let's keep the business logic where your team is fast, and just extract the heavy pipeline into Redis. We'll be done by Friday.

It's about solving the right problems.

Product Manager
Can we add these 15 new composite filters to the dashboard? The newest enterprise client really wants them.
We could, but analytics show 90% of users only ever click 'Status: Active'. What if we just polish that one flow and ship it today?
Product Manager
You know what? Let's do that and go to lunch.

Elevating the team.

Engineering Lead
Velocity is dropping. Onboarding takes weeks and our builds take 45 minutes.
I'll dockerize the dev environment and move CI to parallel runners. Onboarding will take 10 minutes.
Engineering Lead
Are you an actual wizard? 🧙‍♂️
Just a guy with a YAML file.

And unblocking people.

Junior Dev
I've been staring at this Safari bug for 3 hours. The layout completely collapses but only on iOS 15 and I'm losing my mind.
Jump on a huddle. Let's see if adding `min-h-0` on that flex child fixes it... Yep, there it is.
Junior Dev
Wait, how did you spot that instantly? Are you a genius?
I'm not smart, I've just been bitten by that exact same quirk three times last year. 😅

When I say I make software,

It means I really make ithappen.
With everything that goes with it.

Any software...

Client
We have this legacy system. We need to automatically translate millions of lines of JavaScript business logic into Fortran to run on our mainframe computing cluster. Do you know Fortran?
No. But I'll have the compiler AST parser and a proof-of-concept transpiler ready by Tuesday.

And here are some orgs I helped ship.

Develion
Certus Mercatus
Bistro
Silicon Jelly
ECH
McCann
Logica
Rockaway
7divs
Quanti
This Dot Labs
Google
Cloudinary
Roblox
Jan
Hi this is Jan. Sounded interesting? Let's connect.
You
© 2026 Jan Kaiser.