02 / The idea
More room for the problem you need to solve.
Your project starts with what needs to work better: what your customers need, where your team loses time, or what your current tools cannot do.
We use AI within the design and engineering process to reduce the time spent on repetitive implementation. That can make a more complex, custom solution affordable where the same work would have required a larger budget a few years ago.
The expertise still matters. Evangelos defines the system, connects the parts, checks the output, and takes responsibility for what ships. AI needs that direction and review to produce work you can rely on.
The aim is to put more of your budget into solving the right problem, with a solution built around the way you work.
03 / AI for your work
AI that already knows your job.
Most people meet AI as a chat window. You open it, re-explain who you are, paste in your context, and start over tomorrow. It never learns your job.
We build the opposite: a setup that already knows your work, your tools, and your voice, and runs on a command. The tasks that used to take an afternoon take minutes, and still sound like you. Built on Claude Code and agent tooling, around one person's real work.
See how it worksProduct owners
A rough idea becomes a written spec, in your team's format and your voice.
Marketing strategists
A campaign thought becomes on-brand drafts, ready to review instead of write.
Business analysts
A new project becomes a structured analysis, run with the same commands every time.
Founders & small teams
The repeatable knowledge work stops eating your week.
04 / Selected work
Pnoe Precision
AI architecture & engineering
Pnoe turns a 10-minute breath test into a lab-grade read on your metabolism. Evangelos is its chief engineer and AI architect: the Precision iOS app, the engines that build each person's nutrition and training plan, and the architecture underneath. The analyzer it runs on matched lab equipment at a correlation of 0.98 in peer-reviewed research, which is why it now runs inside Equinox and Four Seasons.
View project →TrueLifeAudio
Web
A storefront for handmade high-end amplifiers and the brands TrueLifeAudio distributes. Built to feel as considered as the equipment it sells: fast, quiet, and out of the way, so the products and the reviews carry the room.
View project →Nikos Economopoulos
Web
A portfolio and print shop for the Magnum photographer, built to disappear so the photographs are the only thing you look at.
View project →Daras Dental
Web
An old, dated site for a dental practice, rebuilt completely in two weeks. Custom, fast, and built to last.
View project →Evangelos Tzemis
Photography · personal
A photographer's portfolio and print shop for my own street and documentary work, the interface kept out of the way of the frames.
View project →Riot Shades
Web
The storefront for an Athens eyewear brand's debut collection, built in English and Greek with a locator across 32 Greek opticians.
View project →05 / Range · brands we imagined
We do not only build. We imagine brands too.
Same hand, two souls. Sando and Scoop share one island and sound nothing alike.
FYLY
Brand identity · with George Tsavalos
A six-month rebrand built around one idea: sailing with people who know you.
06 / How we work
Evangelos leads and builds every project himself. When the work needs a specialist, he brings in a trusted partner, only when it is actually needed.
The people below are the ones he works with. They join the work directly, with no layer of management in between.
07 / About
Evangelos Tzemis started Lemonroot in 2023, after years of making things in different mediums.
He studied computer science in Athens and Copenhagen, where his research on touch interaction was published and his thesis proposed a new way to sense pressure on a screen. At CERN he co-wrote a machine-learning library used to untangle scientific records. At Beat he was lead developer on his team during a redesign of the ride-hailing app. At Pnoe he is chief engineer and AI architect.
Before software, and still alongside it, there was other craft. He directed a dance production that toured France for six months and played to fifty thousand people. He produces and engineers music, with ten albums recorded. He photographs, and sells the work.
The thread is not the medium. It is the attention. Each discipline teaches the same lesson from a different angle: how a thing is made is what it becomes.
08 / Contact
If you are building something you want to come out specific, not generic, we should talk.
Six short questions. You get a useful direction before you share your contact details.
- 01Start with the result
- 02See the likely project shape
- 03Send it for a personal review