Product design · Athens, Greece
Bridging cognitive psychology and front-end architecture to reduce mental friction.
Monaze Money
Shipped on web and desktop from one domain model, with the phone app designed as the next step.
Lepsychon
A design system exact enough that the build follows the file instead of reinterpreting it.
BioSync
Every accessibility failure found in the port is written up in the repository, each with its fix.
Labeling Jobs
Every screen spends the reader’s attention. Cognitive load theory says how much there is to spend, a mental model says where it goes, and the code decides whether the decision survives the build. Each principle is paired with the product where it made the call.
The mind
Cognitive load theory separates the load a task carries from the load its presentation adds. Only the second is a design choice, and it is the one I cut first.
The interface · Lepsychon
Review shows one term at a time. Match-the-pairs was already designed and was deleted: with four pairs on screen the last falls out by elimination, so the screen measured sorting instead of recall.
The build
The scheduler takes one grade per answer. One term per screen is what makes that grade honest, so the interface and the data contract are the same decision.
The mind
People read an unfamiliar screen through the nearest thing they already understand. Matching that model is almost free. Teaching a new one is the most expensive thing an interface can ask.
The interface · Monaze Money
The ledger borrows bookkeeping, a vocabulary its readers already own: a rail you work from, a sheet you work on, and every screen ending in one action that either balances or does not.
The build
A transfer is written as two linked rows, so every balance stays a plain sum of one account’s own rows. The model on screen is the model in the database, and neither has to explain the other.
The mind
Perception is not uniform. Some readers never see the colour, and some hear the screen instead of seeing it. A state only one sense can read is a state some people never get.
The interface · BioSync
The day is drawn as a blister card. A taken dose leaves an emptied cavity, so what is done and what is due reads from shape, before and without colour.
The build
An icon-only button cannot be constructed without an accessible name. The label is a required property, so the type system refuses the mistake before a review has to catch it.
The whole process, step by step, is on my approach.